WO2022019897A1 - Link training - Google Patents

Link training Download PDF

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Publication number
WO2022019897A1
WO2022019897A1 PCT/US2020/042994 US2020042994W WO2022019897A1 WO 2022019897 A1 WO2022019897 A1 WO 2022019897A1 US 2020042994 W US2020042994 W US 2020042994W WO 2022019897 A1 WO2022019897 A1 WO 2022019897A1
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WIPO (PCT)
Prior art keywords
display device
electronic device
link parameter
response
controller
Prior art date
Application number
PCT/US2020/042994
Other languages
French (fr)
Inventor
Rami BATHANIAH
Thong Thai
Monji G. Jabori
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Hewlett-Packard Development Company, L.P.
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Publication date
Application filed by Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/US2020/042994 priority Critical patent/WO2022019897A1/en
Publication of WO2022019897A1 publication Critical patent/WO2022019897A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/02—Comparing digital values
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1431—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display using a single graphics controller
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/005—Adapting incoming signals to the display format of the display terminal
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/006—Details of the interface to the display terminal
    • G09G5/008—Clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/04—Display device controller operating with a plurality of display units
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/12—Use of DVI or HDMI protocol in interfaces along the display data pipeline
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/22—Detection of presence or absence of input display information or of connection or disconnection of a corresponding information source

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Computer Graphics (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

Example implementations relate to link training. In some examples, a controller of an electronic device may cause, in response to detecting a first display device connecting to the electronic device, a first link training process to occur between the electronic device and the first display device to generate a first display device link parameter associated with the first display device, detect a second display device is connected to the electronic device, refrain, in response to determining that the second display device is the first display device, from causing an additional link training process to occur, and cause, in response to determining that the second display device is different from the first display device, a second link training process to occur to generate a second display device link parameter.

Description

LINK TRAINING
Background
[0001] A display device may be utilized to display information. The information displayed may include text, images, and/or video, among other types of information. The display device may be utilized to display information by receiving a signal from a computing device.
Brief Description of the Drawings
[0002] Figure 1 illustrates an example of an electronic device for link training consistent with the disclosure.
[0003] Figure 2 illustrates an example of an electronic device and a computing device for link training consistent with the disclosure.
[0004] Figure 3 illustrates an example of a computing device for link training consistent with the disclosure.
[0005] Figure 4 illustrates a block diagram of an example system for link training consistent with the disclosure.
Detailed Description
[0006] A display device can display information for a user. As used herein, the term “display device” refers to an output device that includes a display area that displays information provided by an electrical signal in a visual and/or tactile form. As used herein, the term “display area” refers to an area of a display that displays information. For example, a display device can include a display area that can display information such as text, videos, and/or images as a result of an electrical signal provided to the display from a computing device. [0007] As used herein, the term “computing device” refers to an electronic system having a processing resource, memory resource, and/or an application-specific integrated circuit (ASIC) that can process information. Examples of computing devices can inciude, for instance, a laptop computer, a notebook computer, a desktop computer, and/or a mobile device, among other types of computing devices. As used herein, a mobile device can include devices that are (or can be) carried and/or worn by a user. For example, a mobile device can be a phone (e.g., a smart phone), a tablet, a personal digital assistant (PDA), smart glasses, and/or a wrist-worn device (e.g., a smart watch), among other types of mobile devices,
[0008] Some users may connect a computing device to a display device and/or multiple display devices. For example, a user may connect a computing device to a display device (or display devices) such that the computing device can cause the display device (or display devices) to display information.
[0009] In order to facilitate electrical signal transmission between the computing device and the display device(s), a link training process can occur. For example, when a display device is connected to a computing device (e.g., directly or indirectly), a link training process can occur so that the display device(s) display information as a result of an electrical signal provided to the display device(s) from the computing device.
[0010] However, when a display device is connected to the computing device (e.g., directly or indirectly), a link training process can re-occur, even if the display device is the same display device. Such a link training process can be slow, resulting in a user having to wait for the display area of the display device to be activated. Additionally, repeated link training processes may cause link training data to be corrupted, which can result in a display device being activated incorrectly or not being activated. Such occurrences may cause a poor user experience for a user.
[0011] Link training, according to the disclosure, can allow for link training parameters to be stored in memory at an electronic device. Such link training parameters can be utilized for a computing device if the display device remains the same. Additionally, if a display device is different, the link training process can occur to generate revised link training parameters. Such an approach can avoid a link training process from occurring whenever a display device is connected to an electronic device, which can lead to less time waiting by a user, as weii as more consistent display device activation as compared to previous approaches. [0012] Figure 1 illustrates an example of an electronic device 100 for link training consistent with the disclosure. As illustrated in Figure 1, the electronic device 100 can include a controller 102 and a memory 106.
[0013] As illustrated in Figure 1, the electronic device 100 can include a controller 102. As used herein, the term “electronic device” refers to a device that utilizes a flow of electrical current in order to accomplish a particular purpose. For example, the electronic device 100 can utilize electrical current in order to allow first display device 104-1 and/or second display device 104-2 to display information for a user. As used herein, the term “controller” refers to a device that manages operations for an electronic device. For example, the controller 102 can execute instructions utilizing a processing resource (e.g., not illustrated in Figure 1) for link training consistent with the disclosure.
[0014] The electronic device 100 can be connected to a first display device 104-1 and/or a second display device 104-2, as is further described herein. The first display device 104-1 and/or the second display device 104-2 can display information to a user when connected to the electronic device 100. [0015] In some examples, the electronic device 100 can be a dock. As used herein, the term “dock” refers to a device that connects a computing device to a display device or more than one display device. For example, a user may utilize a dock in order to connect a computing device to first display device 104-1 or second display device 104-2 (or first dispiay device 104-1 and second display device 104-2) such that the computing device can cause the first display device 104-1 and/or second display device 104-2 to dispiay information. [0016] The dock can be a standalone device. However, examples of the disclosure are not so limited. For example, the dock can be included in a display device (e.g., first display device 104-1 or second display device 104-2), included in a computing device (e.g., computing device 210, as is further described in connection with Figure 2), etc.
[0017] In some examples, the electronic device 100 can be a computing device. For example, a user may connect first display device 104-1 or second display device 104-2 (or first display device 104-1 and second display device 104-2) directly to the computing device such that the computing device can cause the first display device 104-1 and/or second display device 104-2 to display information, as is further described in connection with Figure 3.
[0018] Although the electronic device 100 is illustrated in Figure 1 as being connected to two display devices 104-1 and/or 104-2, examples of the disclosure are not so limited. For example, the electronic device 100 can be connected to more than two displays (e.g., three or more displays).
[0019] The controller 102 can cause a first link training process to occur between the electronic device 100 and the first display device 104-1 in response to detecting the first display device 104-1 connecting to the electronic device 100. The controller 102 can detect the first display device 104-1 connecting to the electronic device 100 via a hot plug detect (HPD) pin, as is further described in connection with Figure 2.
[0020] As used herein, the term “link training process” refers to a control process that configures and initializes a communication link between an electronic device and a display device. Such a control process can generate a display device link parameter. For example, the first link training process can generate a first display device link parameter that is associated with the first display device 104-1. As used herein, the term “display device link parameter” refers to data characterizing a communication link between an electronic device and a display device. For example, the first display device link parameter generated in response to the first link training process occurring can include data characterizing the communication link between the electronic device 100 and the first display device 104-1.
[0021] A display device link parameter can include link training data characterizing a data connection between an electronic device 100 and a display device 104-1 and/or a data connection between the electronic device 100 and a display device 104-2. For example, the first display device link parameter can include link training data characterizing the data connection between the electronic device 100 and the first display device 104-1. As used herein, the term “data connection” refers to an interface through which information is transmitted. Link training data characterizing a data connection can include, for example, physical parameters of the connection between the electronic device 100 and a display device. Such physical parameters can include, for example, a type of data/iink connection supported by the display device, a number of serialized lanes used, speed of the lanes (e.g., bit-rate), clock information (e.g., a link clock from data being transmitted from the electronic device to a display device), channel equalization, symbol-lock, interlane alignment, etc.
[0022] A display device link parameter can include metadata characterizing capabilities of a display device. For example, the first display device link parameter can include metadata characterizing capabilities of the first display device 104-1. As used herein, the term “metadata” refers to a set of data that describes and gives information about other data. For example, metadata characterizing capabilities of a display device (e.g., the first display device 104-1) can include a size of the display device, timings supported by the display device, luminance data, pixel mapping data, etc. in some examples, the metadata can include Extended Display Identification Data (EDID).
[0023] A display device link parameter can include a display device identifier. As used herein, the term “display device identifier” refers to an attribute that serves as identification and characterization of a display device.
For example, the display device identifier for the first display device 104-1 can include a serial number, product number, media access control (MAC) number, etc. The display device identifier can be utilized to determine an identity of a particular display device, as is further described herein.
[0024] In some examples, the display device identifier can further include a port identifier in addition to the display device identifier. As used herein, the term “port identifier” refers to an attribute that, when a display device is connected to another device, serves to identify a port through which the display device is connected to the another device. As used herein, the term “port” refers to an interface to connect a display device to another device. The port can be, for example, a High-Definition Multimedia Interface (HDMI) port, DisplayPort port, Digital Visual Interface (DVI) port, among other types of ports. The port identifier can include data characterizing an identity of the physical port a display device 104-1 is connected to and/or data characterizing an identity of a physical port a display device 104-2 is connected to. For instance, the first display device link parameter can include a port identifier that indicates that the first display device 104-1 is connected to “Port A” of the electronic device 100 (e.g., not illustrated in Figure 1).
[0025] As described above, the controller 102 can generate a first display device link parameter associated with the first display device 104-1 in response to detecting the first display device 104-1 connecting to the electronic device 100. The first display device link parameter can be stored at the electronic device 100. For example, the first display device link parameter can be stored in the memory 106 included in the electronic device 100.
[0026] The controller 102 can detect that a second display device 104-2 is connected to the electronic device 100. For example, although not illustrated in Figure 1, the electronic device 100 can include an HPD pin that can detect a hot plug event that occurs when the second display device 104-2 is connected to the electronic device 100, as is further described in connection with Figure 2. [0027] In response to the second display device 104-2 connecting to the electronic device 100, the controller 102 can receive a second display device identifier that is associated with the second display device 104-2. The display device identifier for the second display device 104-2 can include a serial number, product number, media access control (MAC) number, a port identifier, etc. For instance, the second display device link parameter can include a port identifier that indicates that the second display device 104-2 is connected to a particular port (e.g., “Port A”, “Port B”, "Port C”, etc.) of the electronic device 100 (e.g., not illustrated in Figure 1).
[0028] When a display device is connected to the electronic device 100, the electronic device 100 may not know the identity of the display device, if the second display device 104-2 is the same device as the first display device 104-1 (e.g., the first display device 104-1 is disconnected and reconnected to the same port), the electronic device 100 can refrain from causing another link training process to occur, as the first display device 104-1 already has a first display device link parameter generated for the port corresponding to the port identifier. However, if the second display device 104-2 is a different display device from the first display device 104-1, the controller 102 can cause a second link training process to occur to generate a second display device link parameter for the second display device 104-2, as is further described herein. Additionally, if the first display device 104-1 is disconnected from a first port of the electronic device 100 and reconnected to a second port of the electronic device 100 (e.g., to a different port of the electronic device 100), the controller 102 can cause a second link training process to occur to generate a revised display device link parameter for the first display device 104-1 , as is further described herein. Accordingly, the controller 102 can utilize the display device identifiers received when a display device is connected to the electronic device 100 to determine an identity of the display device, as is further described herein. [0029] The controller 102 can determine whether the first display device 104-1 is the second display device 104-2 by comparing the first display device identifier included in the first display device link parameter with the second display device identifier. As described above, when the second display device 104-2 is connected to the electronic device 100, the second display device 104- 2 can transmit a second display device identifier to the electronic device 100. The controller 102 can compare the first display device identifier (e.g., a serial number of the first display device 104-1) to the second display device identifier (e.g., a serial number of the second display device 104-2) and/or compare the first port identifier of the first display device 104-1 with the second port identifier of the second display device 104-2.
[0030] In response to the controller 102 determining that the second display device 104-2 is the first display device 104-1, the controller 102 can refrain from causing an additional link training process to occur. For example, the controller 102 can determine that the first display device identifier (e.g., a serial number) matches the second display device identifier (e.g., the same serial number) and the first port identifier matches the second port identifier.
The controller 102 can then determine that the first display device 104-1 is the second display device 104-2 (e.g,, the first display device 104-1 may have been disconnected from a port of the electronic device 100 and re-connected to the same port of the electronic device 100). Since the second display device 104-2 is the same display device as the first display device 104-1 and was reconnected to the same port of the electronic device 100, the same display device link parameter can be utilized for the second display device 104-2. Utilizing the same display device link parameter in such an example can prevent an additional link training process from having to occur, which can reduce wait times for activation of a display device for a user as well as more consistent display device activation.
[0031] In response to the controller 102 determining that the second display device 104-2 is the first display device 104-1 but the first port identifier does not match the second port identifier, the controller 102 can cause a revised link training process to occur to generate a revised display device link parameter for the first display device 104-1. For example, the controller 102 can determine that the first display device identifier (e.g., a serial number) matches the second display device identifier (e.g., the same serial number) but the first port identifier does not match the second port identifier. The controller 102 can then determine that the first display device 104-1 is the second display device 104-2 but was connected to a different port of the electronic device (e.g., the first display device 104-1 may have been disconnected from a first port of the electronic device 100 and re-connected to a second port of the electronic device 100). Accordingly, the controller 102 can cause the revised link training process to occur to generate the revised display device link parameter, where the revised display device link parameter is associated with the first display device 104-1.
[0032] In response to the controller 102 determining that the second display device 104-2 is different from the first display device 104-1, the controller 102 can cause a second link training process to occur to generate a second display device link parameter. For example, the controller 102 can determine that the first display device identifier (e.g., a serial number) does not match the second display device identifier (e.g., a different serial number). The controller 102 can then determine that the first display device 104-1 is a different display device from the second display device 104-2. Accordingly, the controller 102 can cause the second link training process to occur to generate the second display device link parameter, where the second display device link parameter is associated with the second display device 104-2.
[0033] Similar to the first display device link parameter, the second display device link parameter can include data characterizing the communication link between the electronic device 100 and the second display device 104-2 and the display device identifier for the second display device 104- 2. Data characterizing the communication link can include link training data characterizing a data connection between the electronic device 100 and the second display device 104-2 and/or metadata characterizing capabilities of the second display device 104-2.
[0034] As illustrated in Figure 1, the electronic device 100 can include a memory 106. The memory 106 can store the first display device link parameter, the second display device link parameter, or a combination thereof.
[0035] Figure 2 illustrates an example of an electronic device 200 and a computing device 210 for link training consistent with the disclosure. As illustrated in Figure 2, the electronic device 200 can include a controller 202, a memory 206, and an HPD pin 208.
[0036] As illustrated in Figure 2, the electronic device 200 can include an HPD pin 208. As used herein, the term “HPD pin” refers to an electrical connection that can receive a signal. For example, the HPD pin 208 can be an electrical connection that can receive a signal when a display device is connected to the electronic device 200. The HPD pin 208 can, in some examples, be incorporated Into a connector, such as an HDMi connector, a DisplayPort connector, a DVI connector, among other types of connectors. [0037] The HPD pin 208 can detect a first display device 204-1 connecting to the electronic device 200 by receiving a signal in response to the first display device 204-1 connecting to the electronic device 200. As previously described in connection with Figure 1, the controller 202 can cause a link training process to occur between the electronic device 200 and the first display device 204-1 to generate a first display device link parameter associated with the first display device 204-1. [0038] The controller 202 can detect a second display device 204-2 connecting to the electronic device 200 via the HPD pin 208 receiving a signal. For example, the HPD pin 208 can receive a signal in response to a hot plug event occurring. As used herein, the term “hot plug event” refers to a device being added to or removed from an electronic device while the electronic device is powered. For example, a user may connect the second display device 204-2 while the electronic device 200 is powered on and operating, and the HPD pin 208 can receive a signal in response to the second display device 204-2 being connected to the electronic device 200. The controller 202 can determine that a hot plug event has occurred in response to the HPD pin 208 receiving a signal. [0039] Although the HPD pin 208 is described above as being a hardware pin, examples of the disclosure are not so limited. For example, the HPD pin 208 can be a virtual wire and/or signal.
[0040] As previously described in connection with Figure 1, the controller 202 can determine the identity of the second display device 204-2. in response to determining the second display device 204-2 is the first display device 204-1, the controller 202 can refrain from causing an additional link training process from occurring.
[0041] In response to the controller 202 determining that the second display device 204-2 is different from the first display device 204-1, the controller 202 can cause a second link training process to occur to generate a second display device link parameter associated with the second display device 204-2.
[0042] As illustrated In Figure 2, the electronic device 200 can include a memory 206. The memory 206 can store the first display device link parameter, the second display device link parameter, or a combination thereof,
[0043] As illustrated in Figure 2, a computing device 210 may be connected to the electronic device 200. For example, the electronic device 200 may be a dock and a user may connect computing device 210 to the dock in order to utilize a display device connected to the dock (e.g., first display device 204-1 and/or second display device 204-2). [0044] In response to the computing device 210 connecting to the electronic device 200, the controller 202 can transmit the first display device link parameter or the second display device link parameter to the computing device 210. The controller 202 can transmit the first display device link parameter and/or the second display device link parameter to the computing device 210 based on an identity of the computing device 210, as is further described herein. [0045] In response to the computing device 210 connecting to the electronic device 200, the controller 202 can receive, from the computing device 210, a computing device identifier associated with the computing device 210.
As used herein, the term “computing device identifier” refers to an attribute that serves as identification to a computing device. For example, the computing device identifier for the computing device 210 can inciude a serial number, product number, media access control (MAC) number, etc.
[0046] The controller 202 can determine whether the first display device link parameter corresponds to the computing device 210 by comparing the computing device identifier with an identifier associated with the first display device link parameter. As used herein, the term “identifier” refers to an attribute that serves as identification to a display device link parameter. For example, the identifier for the first display device link parameter can be an identification number, a hash, etc. The identifier associated with the first display device link parameter can be utilized to determine when to transmit the display device link parameter to the computing device 210.
[0047] The controller 202 can transmit the first display device link parameter to the computing device 210 in response to the computing device identifier matching the identifier associated with the first display device link parameter. For example, the computing device 210 can receive the display device link parameter for the first display device 204-1 when the computing device 210 is connected to the electronic device 200. This can ensure that display settings included on the computing device 210 can operate correctly with the data included in the first display device link parameter associated with the first display device 204-1. [0048] Similarly, the controller 202 can determine whether the second display device link parameter corresponds to the computing device 210 by comparing the computing device identifier with an identifier associated with the second display device link parameter. For example, the identifier for the second display device link parameter can be an identification number, a hash, etc. [0049] The controller 202 can transmit the second display device link parameter to the computing device 210 in response to the computing device identifier matching the identifier associated with the second display device link parameter. For example, the computing device 210 can receive the display device link parameter for the second display device 204-2 when the computing device 210 is connected to the electronic device 200. This can ensure that display settings included on the computing device 210 can operate correctly with the data included in the second display device link parameter associated with the second display device 204-2.
[0050] Although the computing device 210 is described above as receiving the first display device link parameter or the second display device link parameter, examples of the disclosure are not so limited. For example, the computing device 210 may receive both the first display device link parameter or the second display device link parameter in an example in which the computing device 210 is to utilize both the first display device 204-1 and the second display device 204-2. In such an instance, the controller 202 can transmit both the first display device link parameter and the second display device link parameter in response to the computing device identifier of the computing device 210 matching both the identifier associated with the first display device link parameter and the identifier associated with the second display device link parameter.
[0051] In some examples, a different computing device may be connected to the electronic device 200. in such an example, the controller 202 can receive a different computing device identifier, which may not match with the identifiers for the first display device link parameter and/or the second display device link parameter, in such an example, the controller 202 may cause a link training process to occur. [0052] The controller 202 can transmit a wake signal to the first display device 204-1 and/or the second display device 204-2 in response to the computing device 210 connecting to the electronic device 200. As used herein, the term “wake signal” refers to a message that causes a display device to power on to receive a video signal. For example, the wake signal can be transmitted by the controller 202 to the first display device 204-1 and/or the second display device 204-2 so that the computing device 210 can transmit a video signal to the first display device 204-1 and/or the second display device 204-2 such that display areas of the first display device 204-1 and/or the second display device 204-2, respectively, can display information.
[0053] Figure 3 illustrates an example of a computing device 310 for link training consistent with the disclosure. As illustrated in Figure 3, the computing device 310 can include a controller 302 and a memory 306.
[0054] In the example illustrated in Figure 3, the first display device 304-1 and/or the second display device 304-2 can be connected to the computing device 310. For example, a user may connect first display device 304-1 or second display device 304-2 (or first display device 304-1 and second display device 304-2) directly to the computing device 310 such that the computing device 310 can cause the first display device 304-1 and/or second display device 304-2 to display information, as is further described herein.
[0055] As illustrated in Figure 3, the computing device 310 can include an HPD pin 308. For example, the HPD pin 308 can be an electrical connection that can receive a signal when a display device is connected to the computing device 310.
[0056] The HPD pin 308 can detect a first display device 304-1 connecting to the computing device 310 by receiving a signal in response to the first display device 304-1 connecting to the computing device 310. As previously described in connection with Figure 1, the controller 302 can cause a link training process to occur between the computing device 310 and the first display device 304-1 to generate a first display device link parameter associated with the first display device 304-1. [0057] The controller 302 can detect a second display device 304-2 connecting to the computing device 310 via the HPD pin 308 receiving a signal. For example, a user may connect the second display device 304-2 while the computing device 310 is powered on and operating, and the HPD pin 308 can receive a signal in response to the second display device 304-2 being connected to the computing device 310. The controller 302 can determine that a hot plug event has occurred in response to the HPD pin 308 receiving the signal.
[0058] As previously described in connection with Figure 1, the controller 302 can determine the identity of the second display device 304-2. in response to determining the second display device 304-2 is the first display device 304-1, the controller 302 can refrain from causing an additional link training process from occurring.
[0059] In response to the controller 302 determining that the second display device 304-2 is different from the first display device 304-1, the controller 302 can cause a second link training process to occur to generate a second display device link parameter associated with the second display device 304-2.
[0060] As illustrated in Figure 3, the computing device 310 can include a memory 306. The memory 306 can store the first display device link parameter, the second display device link parameter, or a combination thereof. Utilizing the first display device link parameter and/or the second display device link parameter, the computing device 310 can transmit a video signal to the first display device 304-1 and/or the second display device 304-2 such that display areas of the first display device 304-1 and/or the second display device 304-2, respectively, can display information.
[0061] Figure 4 illustrates a block diagram of an example system 420 for link training consistent with the disclosure, in the example of Figure 4, system 420 includes a processing resource 422 and a non-transitory machine-readable storage medium 424. Although the following descriptions refer to a single processing resource and a single machine-readable storage medium, the descriptions may also apply to a system with multiple processors and multiple machine-readable storage mediums, in such examples, the instructions may be distributed across multiple machine-readable storage mediums and the instructions may be distributed across multiple processors. Put another way, the instructions may be stored across multiple machine-readable storage mediums and executed across multiple processors, such as in a distributed computing environment.
[0062] Processing resource 422 may be a central processing unit (CPU), microprocessor, and/or other hardware device suitable for retrieval and execution of instructions stored in machine-readable storage medium 424. In the particular example shown in Figure 4, processing resource 422 may receive, determine, and send instructions 426, 428, 430, and 432. As an alternative or in addition to retrieving and executing instructions, processing resource 422 may include an electronic circuit comprising a number of electronic components for performing the operations of the instructions in machine-readable storage medium 424. With respect to the executable instruction representations or boxes described and shown herein, it should be understood that part or all of the executable instructions and/or electronic circuits included within one box may be included in a different box shown in the figures or in a different box not shown.
[0063] Machine-readable storage medium 424 may be any electronic, magnetic, optical, or other physical storage device that stores executable instructions. Thus, machine-readable storage medium 424 may be, for example, Random Access Memory (RAM), an Electrically-Erasable Programmable Read-Only Memory (EEPROM), a storage drive, an optical disc, and the like. The executable instructions may be “installed” on the system 420 illustrated in Figure 4. Machine-readable storage medium 424 may be a portable, external or remote storage medium, for example, that allows the system 420 to download the instructions from the portable/external/remote storage medium. In this situation, the executable instructions may be part of an “installation package”.
[0064] Cause instructions 426, when executed by a processor such as processing resource 422, may cause system 420 to cause a first link training process to occur between the electronic device 400 and a first display device to generate a first display device link parameter associated with the first display device in response to detecting the first display device connecting to the electronic device 400. The first display device link parameter can include link training data characterizing a data connection between the electronic device 400 and the first display device and/or metadata characterizing capabilities of the first display device.
[0065] Detect instructions 428, when executed by a processor such as processing resource 422, may cause system 420 to detect a second display device is connected to the electronic device 400. For example, although not illustrated in Figure 4, the electronic device 400 can include an HPD pin which can detect the second display device being connected to the electronic device 400 via the HPD pin receiving a signal in response to a hot plug event occurring.
[0066] Refrain instructions 430, when executed by a processor such as processing resource 422, may cause system 420 to refrain from causing an additional link training process to occur in response to determining that the second display device is the first display device. For example, if a display device identifier associated with the second display device matches a display device identifier associated with the first display device, the controller 402 can determine the second display device is the first display device. Accordingly, a link training process does not have to occur.
[0067] Cause instructions 432, when executed by a processor such as processing resource 422, may cause system 420 to cause a second link training process to occur to generate a second display device link parameter in response to determining that the second display device is different from the first display device. For example, if a display device identifier associated with the second display device does not match a display device identifier associated with the first display device, the controller 402 can determine the second display device is different from the first display device and can cause the second link training process to occur to generate the second display device link parameter. The second display device link parameter can include link training data characterizing a data connection between the electronic device 400 and the second display device and/or metadata characterizing capabilities of the second display device.
[0068] In the foregoing detailed description of the disclosure, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration how examples of the disclosure may be practiced. These examples are described in sufficient detail to enable those of ordinary skill in the art to practice the examples of this disclosure, and it is to be understood that other examples may be utilized and that process, electrical, and/or structural changes may be made without departing from the scope of the disclosure.
[0069] The figures herein follow a numbering convention in which the first digit corresponds to the drawing figure number and the remaining digits identify an element or component in the drawing. Similar elements or components between different figures may be identified by the use of similar digits. For example, 104 may reference element “04” in Figure 1, and a similar element may be referenced as 204 in Figure 2.
[0070] Elements illustrated in the various figures herein can be added, exchanged, and/or eliminated so as to provide a plurality of additional examples of the disclosure, in addition, the proportion and the relative scale of the elements provided in the figures are intended to illustrate the examples of the disclosure and should not be taken in a limiting sense. As used herein, "a plurality of an element and/or feature can refer to more than one of such elements and/or features.

Claims

What is claimed:
1. A non-transitory machine-readable medium including instructions that when executed cause a controller of an electronic device to: in response to detecting a first display device connecting to the electronic device, cause a first link training process to occur between the electronic device and the first display device to generate a first display device link parameter associated with the first display device; detect a second display device is connected to the electronic device; in response to determining that the second display device is the first display device, refrain from causing an additional link training process to occur; and in response to determining that the second display device is different from the first display device, cause a second link training process to occur to generate a second display device link parameter,
2. The non-transitory medium of claim 1, wherein the controller is to receive a second display device identifier associated with the second display device in response to the second display device being connected to the electronic device.
3. The non-transitory medium of claim 2, wherein the controller is to determine whether the first display device is the second display device by comparing a first display device identifier included in the first display device link parameter with the second display device identifier.
4. The non-transitory medium of claim 3, wherein the controller Is to cause the second link training process to occur in response to the first display device identifier being different from the second display device identifier.
5. The non-transitory medium of claim 1, wherein the first display device link parameter includes iink training data characterizing a data connection between the electronic device and the first display device.
6. The non-transitory medium of claim 1, wherein the first display device link parameter includes a first display device identifier and metadata characterizing capabilities of the first display device.
7. The non-transitory medium of claim 1, wherein the first display device link parameter is stored at the electronic device.
8. An electronic device, comprising: a controller, wherein the controller is to: in response to detecting a first display device connecting to the electronic device, cause a first link training process to occur between the electronic device and the first display device to generate a first display device link parameter associated with the first display device; detect a second display device is connected to the electronic device via a hot plug event; in response to determining that the second display device is the first display device, refrain from causing an additional link training process to occur; and in response to determining that the second display device is different from the first display device, cause a second link training process to occur to generate a second display device link parameter; and a memory to store the first display device link parameter, the second display device link parameter, or a combination thereof.
9. The electronic device of claim 8, wherein the electronic device includes a hot plug detect (HPD) pin.
10. The electronic device of claim 9, wherein the controller is to determine the hot plug event has occurred in response to the HPD pin receiving a signal.
11, An electronic device, comprising: a hot plug detect (HPD) pin; and a controller, wherein the controller Is to: in response to detecting a first display device connecting to the electronic device, cause a first link training process to occur between the electronic device and the first display device connected to the electronic device to generate a first display device link parameter associated with the first display device; detect a second display device is connected to the electronic device via the HPD pin having received a signal, wherein the HPD pin is to receive the signal in response to a hot plug event occurring; in response to determining that the second display device is the first display device, refrain from causing an additional link training process to occur; in response to determining that the second display device is different from the first display device, cause a second link training process to occur to generate a second display device link parameter; in response to a computing device connecting to the electronic device, transmit the first display device link parameter or the second display device link parameter to the computing device; and a memory to store the first display device link parameter, the second display device link parameter, or a combination thereof.
12. The electronic device of claim 11 , wherein the controller is to receive, in response to the computing device connecting to the electronic device, a computing device identifier associated with the computing device.
13. The electronic device of claim 12, wherein the controller is to: determine whether the first display device link parameter corresponds to the computing device by comparing the computing device identifier with an identifier associated with the first display device link parameter; and transmit the first display device link parameter to the computing device in response to the computing device identifier matching the identifier associated with the first display device link parameter.
14. The electronic device of claim 12, wherein the controller is to: determine whether the second display device link parameter corresponds to the computing device by comparing the computing device identifier with an identifier associated with the second display device link parameter; and transmit the second display device link parameter to the computing device in response to the computing device identifier matching the identifier associated with the second display device link parameter.
15. The electronic device of claim 12, wherein the controller is to transmit a wake signal to the first display device or the second display device in response to the computing device connecting to the electronic device to activate the first display device or the second display device.
PCT/US2020/042994 2020-07-22 2020-07-22 Link training WO2022019897A1 (en)

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Citations (3)

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US7620062B2 (en) * 2003-05-01 2009-11-17 Genesis Microchips Inc. Method of real time optimizing multimedia packet transmission rate
US8645585B2 (en) * 2011-06-10 2014-02-04 Nvidia Corporation System and method for dynamically configuring a serial data link in a display device
US10574762B2 (en) * 2011-09-29 2020-02-25 Samsung Electronics Co., Ltd Method and apparatus for communication connection service

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7620062B2 (en) * 2003-05-01 2009-11-17 Genesis Microchips Inc. Method of real time optimizing multimedia packet transmission rate
US8645585B2 (en) * 2011-06-10 2014-02-04 Nvidia Corporation System and method for dynamically configuring a serial data link in a display device
US10574762B2 (en) * 2011-09-29 2020-02-25 Samsung Electronics Co., Ltd Method and apparatus for communication connection service

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