CN114817101B - Method for optimizing display card driver to read display EDID information - Google Patents

Method for optimizing display card driver to read display EDID information Download PDF

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Publication number
CN114817101B
CN114817101B CN202210581895.7A CN202210581895A CN114817101B CN 114817101 B CN114817101 B CN 114817101B CN 202210581895 A CN202210581895 A CN 202210581895A CN 114817101 B CN114817101 B CN 114817101B
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display
edid data
edid
host
target equipment
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CN114817101A (en
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钱家祥
石小刚
张之龙
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Zhihua Microelectronics Technology Nanjing Co ltd
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Zhihua Microelectronics Technology Nanjing Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter
    • G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention discloses a method for optimizing display card driver to read display EDID information, which comprises the steps of powering up a host computer of target equipment, initializing the display card driver of the target equipment to judge whether the host computer of the current target equipment is connected with a display: further judging the connection state of the host computer of the current target device and the display after power-on according to the obtained judging result, and updating the relevant configuration information of the display; and continuing to initialize other parts of the host of the target device, and ending the instruction. According to the invention, through optimizing in the display card driving module, only the first 18 bytes can be read for the EDID content of the display with the same model, but not all 128 bytes, so that the system processing time is reduced, the time consumed for reading the EDID data when the display is inserted each time is reduced, the execution process of the driving program is accelerated, and the black screen time brought by the initialization of the display module is greatly reduced.

Description

Method for optimizing display card driver to read display EDID information
Technical Field
The invention relates to the technical field of display card driver reading optimization, in particular to a method for optimizing display card driver reading display EDID information.
Background
In a typical graphics card driver, when a display is first started after the display is started, and each time a display is detected to be inserted into the display card, a DDC (DDC, DISPLAY DATA CHANNEL, display data channel) is required to access a display Memory to obtain EDID (extended display identification data Extended display identification data) format data in an EEPROM (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory) in the display, so as to determine display properties (such as resolution, aspect ratio, etc.) of the display.
The purpose of the analysis of the EDID data is to determine various display capabilities supported by the display, such as: the resolution list supported by the display, the time sequence Timing supported by the display and the working mode supported by the display are the most preferred.
After the graphics driver reads the basic information, the driver provides candidates for subsequent mode configuration, i.e., provides the end user with a list of options that can be configured, such as 1920x1080,1280x1024, etc., resolution.
Currently known EDID is generally read through an I2C bus connecting a display card and a display, the EDID data length is 128 bytes, and the current design needs to read all 128 bytes of data into a memory space, then analyze the data, and analyze the information. The transmission speed of the I2C bus is slow, and belongs to a serial working mode, and the time required for reading all 128 bytes of EDID information is long, and in the design of a graphics card driver, the processing speed of each module is a factor that needs to be prioritized.
In view of this, there is an urgent need to design and develop a method for optimizing the display card driver to read the EDID information of the display.
Disclosure of Invention
The invention aims to provide a method for optimizing display card driver to read display EDID information, which solves the problems in the prior art by optimizing in a display card driver module, wherein only the first 18 bytes can be read for the EDID content of the display with the same model, but not all 128 bytes can be read, and the system processing time is reduced. In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for optimizing display card driver to read display EDID information comprises the following steps:
The first step, the target equipment host is powered on, and the initialization target equipment display card driver judges whether the current target equipment host is connected with the display or not:
If the current target equipment host is connected with the display, reading the EDID data of the display, and returning to execute the fourth step; executing the second step in turn;
Step two, further judging the connection state of the host computer of the current target device and the display after power-on according to the obtained judging result, wherein the connection state comprises the following steps: the state that the target equipment host is connected with the display for the first time after power-on and the state that the user pulls out the existing display of the target equipment host and inserts a new display after power-on;
Thirdly, updating the relevant configuration information of the display; wherein,
If the connection state is judged to be that the target equipment host is connected with the display for the first time after power-on, reading EDID data of the display according to the current connection state, feeding back the EDID data to upper software, updating the relevant configuration information of the display, and returning to execute the fourth step;
if the connection state is judged to be a state that a user pulls out a display existing in the host of the target equipment after power-on and inserts a new display, only reading local content of EDID data of the prior display, traversing and searching the EDID data of the prior display based on the local content, feeding back to upper-layer software according to a searching result, updating relevant configuration information of the display, and returning to execute a fourth step;
and fourthly, continuously initializing other parts of the target equipment host computer and ending the instruction.
As an improvement to a method of optimizing display card driver reading display EDID information of the present invention, in a first step,
If the current target equipment host is connected with the display, the specific steps for reading the EDID data of the display are as follows:
The display card driver reads EDID information stored in a nonvolatile memory in the display through a DDC channel connected with the display and based on an I2C bus, and at the moment, the internal register value of the display card in the display card driver is set to be 1;
If the current target device host is not connected with the display, the internal register value of the display card in the display card driver is set to 0.
As an improvement of the method for optimizing the display card driver to read the EDID information of the display according to the present invention, in the third step,
After outputting the connection state of the target device host and the display, and before updating the display-related configuration information according to the connection state,
The display card driver firstly acquires an interrupt signal to inform the current display card interface that the display is inserted, wherein the interrupt signal comprises a display signal detected by the target equipment host after power-on for the first time and a display plug-and-play signal detected by the target equipment host after power-on;
And secondly, the display card driver executes an interrupt service routine according to the interrupt signal, and reads the EDID data of the display.
As an improvement to the method for optimizing the display card driver to read the EDID information of the display, when the display is inserted into the display in the current display card interface and the target equipment host detects the display signal for the first time after the interrupt signal of the driver in the feedback display card driver is powered on, the specific mode of the display card driver to read the EDID data of the display is as follows:
Firstly, a display card driver calls a reading interface of an I2C bus, and reads EDID data in an EEPROM space inside a display in a byte-by-byte mode according to a standard I2C bus protocol, wherein the specific data size of the read EDID data is 128 bytes;
Secondly, after the display card driver reads the EDID data in the EEPROM space, creating a file in a hard disk, and writing the content of the EDID data in the EEPROM space containing 128 bytes into the file in a 'year-month-day-time-minute-second' format, so that repeated files are avoided, and the EDID data in the EEPROM space is covered;
Thirdly, the EDID data in the EEPROM space are fed back to upper software, the relevant configuration information of the display is updated, a reading instruction is ended, and other parts of the host of the target equipment are continuously initialized;
when the display card interface is inserted into the display and the interrupt signal fed back to the driver in the display card drive is a display plug-in signal, the display card drive program reads the EDID data of the display in the following specific modes:
firstly, a display card driver calls a reading interface of an I2C bus, and only reads EDID data of the first 18 bytes in an EEPROM space inside a display according to a standard I2C bus protocol;
Secondly, performing traversal search in the stored EDID data files of the existing display according to the acquired 18-byte EDID data, and ending a reading instruction if the content of the 18-byte EDID data is searched in the EDID data files of the existing display, wherein the EDID data representing the inserted new display is already read;
And feeding the 18-byte EDID data back to upper software, updating and inserting new display related configuration information, ending a reading instruction, and continuously initializing other parts of the host of the target equipment.
Compared with the prior art, the invention has the following beneficial effects:
In order to solve the problems that the DDC channel and the I2C bus are used between the display card and the display to read the EDID data at present, the content of the EDID data for the display with the same model is the same, when the display with the same model is repeatedly plugged in and plugged out, the repeated reading of the EDID wastes the processing time of the system, the delay effect exists on the display picture of the system, and the use experience of a user is affected.
Drawings
Fig. 1 is a schematic diagram of a flow chart of reading EDID data by a target device host according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating an execution sequence of a graphics card driver when a target device host is powered on according to an embodiment of the present invention;
FIG. 3 is a timing diagram of a read interface of a driver call I2C bus of a graphics card according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a process flow of a target device host according to an embodiment of the present invention when the target device host detects a display for the first time during power-up;
fig. 5 is a schematic diagram of a processing flow when a target device host detects a display insertion interrupt when powering up according to an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the invention.
As shown in fig. 1-2, as an embodiment of the present invention, a method for optimizing display card driver to read EDID information of a display is provided, which includes the following steps:
In the first step, the target device host is powered on, and it should be noted that, in the process of powering on the target device (computer host), devices connected to the motherboard are initialized according to a certain sequence, and at this time, the graphics card driver is called and executes initialization of the graphics card device, for example: the method comprises the steps of initializing configuration parameters of a display memory, initializing an audio/video decoding part, initializing a 3D rendering part and the like, and after initializing a target device display card driver, judging whether a current target device host is connected with a display or not by the display card driver.
If the current target equipment host is connected with the display, the display card driver reads EDID information stored in a nonvolatile memory in the display through a DDC channel connected with the display and based on an I2C bus, and at the moment, the internal register value of the display card in the display card driver is set to be 1, and other parts of the target equipment host are continuously initialized until an instruction is ended;
If the current target device host is not connected to the display, the internal register value of the display card in the display card driver is set to 0, and the second step is sequentially executed, that is, the display card driver will again perform the EDID reading operation.
And step two, further judging the connection state of the host computer of the current target device and the display after power-on according to the obtained judgment result, wherein the connection state comprises the following steps: the first state of connecting the display by the host computer of the target device after power-up and the state of pulling out the display existing in the host computer of the target device by the user after power-up, and inserting a new display, it should be noted that the reason for the existence of the two states of the preamble is as follows:
The display is not inserted when the device is started, and the user is connected with the display after the device is started successfully, so that the connection state of the host of the target device and the display is the first state;
When the device is started (when the device is powered on), a user pulls out the connected display and inserts the display, the newly inserted display can be the display with the same model or different models, and the connection state of the host computer of the target device and the display is the second state (pulling-inserting state).
Based on the above technical concept, it should be noted that, no matter which of the two states occurs, the graphics card driver firstly obtains an interrupt signal to inform that the current graphics card interface has an inserted display, at this time, the interrupt signal in the first state is indicated as that the target device host detects the display signal for the first time after power-up, and the interrupt signal in the second state is indicated as that the target device host detects the display plug-in signal after power-up;
It should be noted that, after the graphics card driver acquires the interrupt signal, the display related configuration information needs to be updated according to the interrupt signal, that is, the third step is executed:
Updating the display related configuration information; wherein,
If the connection state is determined to be that the target device host is connected to the display for the first time after the power-on (at this time, the interrupt signal in the first state indicates that the target device host detects the display signal for the first time after the power-on), the specific manner of the display card driver reading the EDID data of the display is as follows:
As shown in fig. 3-4, first, the graphics card driver calls the read interface of the I2C bus, and reads the EDID data in the EEPROM space inside the display in a byte-by-byte manner according to the standard I2C bus protocol, where the specific data size of the read EDID data is 128 bytes, it can be understood that, in the byte-by-byte manner, all 128 bytes of contents of the EDID standard protocol are read, and specific data are shown in the following table 1:
(EDID standard document formulated by VESA (video electronics standards association):
based on table 1, it should be noted that, as can be seen from the above 128 bytes of EDID data content, 8 bytes 0 to 7 are Header parts for identifying that this is a legal EDID data; the 10 bytes 8-17 are manufacturer, product mark part, and can know the information of specific manufacturer and product model, production date, etc., while the latter data is the information of resolution, time sequence, etc. of the display defined by specific EDID protocol, the last byte is check byte, to ensure that the content of the data is correct, i.e. some own transmission error condition will not happen.
Secondly, after the display card driver reads the EDID data in the EEPROM space, creating a file in the hard disk, and using the content of the EDID data in the EEPROM space containing 128 bytes as fields: the "year-month-day-time-minute-second" format of writing files, such as (e.g., 2022-01-01-13-30-20), is aimed at avoiding the occurrence of duplicate files, resulting in the coverage of EDID data in EEPROM space;
thirdly, reading EDID data of the display according to the current connection state, feeding back the EDID data to upper software, updating relevant configuration information of the display, and sequentially carrying out the fourth step;
as shown in fig. 5, if it is determined that the connection state is a state in which the user unplugs the display existing in the target device host after power-up and inserts a new display again (in this case, the interrupt signal in the second state indicates that the target device host detects a display unplugging signal after power-up), the specific manner in which the graphics card driver reads the EDID data of the display is as follows:
Only partial contents of the prior display EDID data (it will be understood that the prior display EDID data herein is 128 bytes of EDID data that the target device host already has the display read normally), that is,
Firstly, a display card driver calls a read interface of an I2C bus, and reads only EDID data (namely two parts of a Header and manufacturer/product information) of the first 18 bytes in an EEPROM space inside a display according to a standard I2C bus protocol, wherein the two parts are shown in a black box part in the following table 2:
Secondly, performing traversal search in the stored EDID data file of the existing display according to the acquired 18 bytes of EDID data, if the content of the 18 bytes of EDID data is searched in the EDID data file of the existing display, reading the EDID data representing the new display inserted, feeding back to upper software according to the search result, updating the related configuration information of the display, and returning to execute the fourth step;
And fourthly, continuously initializing other parts of the host of the target equipment and ending the instruction.
Based on the technical conception, it can be understood that, because DDC channels and I2C buses are used between the display card and the display at present to read EDID data, and EDID data are identical to the content of the display with the same model, when the display is repeatedly plugged in and plugged out, the repeated reading of EDID wastes the processing time of the system, resulting in the problem that the delay effect exists on the display screen of the system and affects the use experience of users.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (3)

1. The method for optimizing the display card driver to read the EDID information of the display is characterized by comprising the following steps:
the first step, the target equipment host is powered on, a target equipment display card driver is initialized, and whether the current target equipment host is connected with a display or not is judged:
If the current target equipment host is connected with the display, reading the EDID data of the display, and returning to execute the fourth step; executing the second step in turn;
Step two, further judging the connection state of the host computer of the current target device and the display after power-on according to the obtained judging result, wherein the connection state comprises the following steps: the state that the target equipment host is connected with the display for the first time after power-on and the state that the user pulls out the existing display of the target equipment host and inserts a new display after power-on;
Thirdly, updating the relevant configuration information of the display; wherein,
If the connection state is judged to be that the target equipment host is connected with the display for the first time after power-on, reading EDID data of the display according to the current connection state, feeding back the EDID data to upper software, updating the relevant configuration information of the display, and returning to execute the fourth step;
If the connection state is judged to be a state that a user pulls out a display existing in the host of the target equipment after power-on and inserts a new display, only reading local content of EDID data of a previous display, traversing and searching in the EDID data of the previous display based on the local content, feeding back to upper-layer software according to a searching result, updating relevant configuration information of the display, and returning to execute a fourth step;
fourthly, continuously initializing other parts of the host of the target equipment and ending the instruction;
When the display signal is detected for the first time by the host of the target device after the display card interface is plugged into the display and the interrupt signal for feeding back the driving program in the display card drive is powered on, the specific mode that the display card drive program reads the EDID data of the display is as follows:
Firstly, a display card driver calls a reading interface of an I2C bus, and reads EDID data in an EEPROM space inside a display in a byte-by-byte mode according to a standard I2C bus protocol, wherein the specific data size of the read EDID data is 128 bytes;
Secondly, after the display card driver reads the EDID data in the EEPROM space, creating a file in the hard disk, and using the content of the EDID data in the EEPROM space containing 128 bytes as fields: writing the file in a format of year-month-day-time-minute-second, so as to avoid repeated files and lead EDID data in the EEPROM space to be covered;
Thirdly, the EDID data in the EEPROM space are fed back to upper software, the relevant configuration information of the display is updated, a reading instruction is ended, and other parts of the host of the target equipment are continuously initialized;
when the display card interface is inserted into the display and the interrupt signal fed back to the driver in the display card drive is a display plug-in signal, the display card drive program reads the EDID data of the display in the following specific modes:
firstly, a display card driver calls a reading interface of an I2C bus, and only reads EDID data of the first 18 bytes in an EEPROM space inside a display according to a standard I2C bus protocol;
Secondly, performing traversal search in the stored EDID data files of the existing display according to the acquired 18-byte EDID data, and ending a reading instruction if the content of the 18-byte EDID data is searched in the EDID data files of the existing display, wherein the EDID data representing the inserted new display is already read;
And feeding the 18-byte EDID data back to upper software, updating and inserting new display related configuration information, ending a reading instruction, and continuously initializing other parts of the host of the target equipment.
2. The method for optimizing display card driver reading display EDID information of claim 1, wherein, in the first step,
If the current target equipment host is connected with the display, the specific steps for reading the EDID data of the display are as follows:
The display card driver reads EDID information stored in a nonvolatile memory in the display through a DDC channel connected with the display and based on an I2C bus, and at the moment, the internal register value of the display card in the display card driver is set to be 1;
If the current target device host is not connected with the display, the internal register value of the display card in the display card driver is set to 0.
3. The method for optimizing display card driver reading display EDID information of claim 1, wherein, in the third step,
After outputting the connection state of the target device host and the display, and before updating the display-related configuration information according to the connection state,
The display card driver firstly acquires an interrupt signal to inform the current display card interface that the display is inserted, wherein the interrupt signal comprises a display signal detected by the target equipment host after power-on for the first time and a display plug-and-play signal detected by the target equipment host after power-on;
And secondly, the display card driver executes an interrupt service routine according to the interrupt signal, and reads the EDID data of the display.
CN202210581895.7A 2022-05-26 2022-05-26 Method for optimizing display card driver to read display EDID information Active CN114817101B (en)

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Publication number Priority date Publication date Assignee Title
CN102455886A (en) * 2011-07-05 2012-05-16 中标软件有限公司 Method for dynamically identifying and configuring external display
CN103150188A (en) * 2013-03-19 2013-06-12 中国人民解放军国防科学技术大学 Quick initialization method for x86 compatible display card of non-x86 instruction set computer
WO2017000835A1 (en) * 2015-06-29 2017-01-05 华为技术有限公司 Extended display identification data (edid) processing method and apparatus
CN111163271A (en) * 2019-12-13 2020-05-15 晶晨半导体（深圳）有限公司 EDID version switching method for solving HDMI compatibility problem

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