CN105446916A - USB bus state switching method and apparatus - Google Patents
USB bus state switching method and apparatus Download PDFInfo
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- CN105446916A CN105446916A CN201410436123.XA CN201410436123A CN105446916A CN 105446916 A CN105446916 A CN 105446916A CN 201410436123 A CN201410436123 A CN 201410436123A CN 105446916 A CN105446916 A CN 105446916A
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- 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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- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
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Abstract
The present invention provides a USB bus state switching method and apparatus. The method comprises: when a suspended state or an idle state of an overall bus of a system exceeds a first time threshold, powering off a USB physical layer PHY; setting a USB controller to a power-saving mode, and reserving a resource; then receiving a first wake-up instruction sent by an application processor AP; and sending the first wake-up instruction to a modem. According to the USB bus state switching method and apparatus, although the USB physical layer PHY is powered off and the USB controller is set to the power-saving mode, when the AP wakes up the modem via the USB bus, or the modem wakes up the AP via the USB bus, the USB bus reserves the related resource for waking up, so as to avoid a process of re-enumeration in the prior art, thereby reducing the time from a sleep state to a wake-up state and improving system stability.
Description
Technical field
The present invention relates to the communication technology, particularly relate to a kind of usb bus state switching method and device.
Background technology
Along with popularizing of intelligent terminal, the relation that intelligent terminal and people live is more and more tightr, existing by the intelligent terminal had, due to the continuous enhancing of its function, power consumption also constantly increases, and therefore, an industry problem urgently to be resolved hurrily is exactly how to reduce the power consumption of intelligent terminal.
Such as, for the intelligent terminal of Android (Android) operating system, application processor (Applicationprocessor is provided with in this terminal, AP) and modulator-demodular unit (modem) be called for short:, wherein, application processor is the VLSI (very large scale integrated circuit) expanding audio frequency and video function and special purpose interface on the basis of low power consumption CPU, and it is for the treatment of the process relevant to various application.Annexation between existing AP and modulator-demodular unit has two kinds usually: (SystemonChip is called for short: SoC) internal bus connection is connected with chip exterior bus SOC (system on a chip).AP and modulator-demodular unit are solidificated in same chip by the former; Latter is AP and modulator-demodular unit is different chips respectively, high speed outer bus by some standards between them connects, as USB (universal serial bus) (UniversalSerialBus, USB), SD IO interface (SecureDigitalInputOutput be called for short:, be called for short: SDIO), 1394, mini third generation I/O bussing technique (PeripheralComponentInterconnectionExpress, be called for short: PCIe) etc., being wherein most widely used of USB.The mode that when power managed of USB interface also mainly uses original entire system bus suspension (systemsuspend) and runs under current Android, bus suspension (run-timesuspend) combines, this mode is switched between operating conditions (Active) and Idle state (Idle) state of usb bus, reduce the data transmission in unnecessary bus, thus the lower power consumption of the transceiver of USB Physical layer (PHY) (transceiver).
But, existing scheme just utilizes the time-out of usb bus (suspend), restart the behavior that (resume) and these operations of Remote Wake Up (remotewakeup) come on control bus, do not touch the internal logic of USBPHY and controller (Controller), wherein most of logic can the free time of USB too time turn off, when USB recovers recovery.
If USBPHY and controller are turned off and Recovery processing, because now PHY turns off, so just can not rely on usb bus itself, and must through the process of re-enumeration, for this equipment complex of modulator-demodular unit, this process is more consuming time, after tested about about 500ms, this is delayed system greatly from dormancy to the time of waking up, reduces the reliability of system.
Summary of the invention
The invention provides a kind of usb bus state switching method and device, for reducing from dormancy to the time of waking up, improve system stability.
First aspect of the present invention is to provide a kind of usb bus state switching method, comprising:
When being in entire system bus suspension or Idle state exceedes very first time threshold value, being then electricity under the Physical layer PHY of USB, the controller of USB is set to battery saving mode, and reservation of resource;
Receive application processor AP transmission first wakes instruction up, sends described first wake instruction up to modulator-demodular unit.
In conjunction with first aspect, in the implementation that the first is possible, also comprise:
When the duration that electricity and the controller of described USB are set to battery saving mode under the PHY of described USB is more than the second time threshold, then discharge described resource;
Wherein, described second time threshold is greater than described very first time threshold value.
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the second is possible, described first wakes instruction up comprises and arranges address instruction and arrange configuration instruction.
Second aspect of the present invention is to provide a kind of usb bus state switching device, comprising:
Processing module, for when being in entire system bus suspension or Idle state exceedes very first time threshold value, being then electricity under the Physical layer PHY of USB, the controller of USB is set to battery saving mode, and reservation of resource;
Receiver module, send for receiving application processor AP first wakes instruction up;
Sending module, wakes instruction up for sending described first to described modulator-demodular unit.
In conjunction with second aspect, in the implementation that the first is possible, described processing module, also for be set to battery saving mode when electricity and the controller of described USB under the PHY of described USB duration more than the second time threshold time, then discharge described resource;
Wherein, described second time threshold is greater than described very first time threshold value.
In conjunction with the first possible implementation of second aspect or second aspect, in the implementation that the second is possible, described first wakes instruction up comprises and arranges address instruction and arrange configuration instruction.
The usb bus state switching method that the embodiment of the present invention provides and device, by when being in entire system bus suspension or Idle state exceedes very first time threshold value, it is then electricity under the Physical layer PHY of USB, the controller Controller of USB is set to battery saving mode, and reservation of resource, receive application processor AP transmission again first wakes instruction up, sends described first wake instruction up to modulator-demodular unit.Although electricity under achieving the Physical layer PHY to USB, and the controller of USB is set to battery saving mode, but when AP wakes modulator-demodular unit up by usb bus, or, when modulator-demodular unit wakes AP up by usb bus, because usb bus remains the related resource for waking up, thus avoid the process of re-enumeration in prior art, thus substantially increase from dormancy to the time of waking up, improve system stability.
Accompanying drawing explanation
The schematic diagram of a kind of usb bus state switching method that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of the another kind of usb bus state switching method that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is usb bus power consumption contrast schematic diagram;
Fig. 4 is USB wakeup time contrast schematic diagram;
The structural representation of a kind of usb bus state switching device that Fig. 5 provides for the embodiment of the present invention;
The inner AP of the usb bus state switching device that Fig. 6 provides for the embodiment of the present invention and modulator-demodular unit connection diagram.
Embodiment
USB power consumption state machine under Android (Android) system is defined as 4: S0 and represents operating conditions (Busy) by the following embodiment of the present invention; S1 represents Idle state (Idle); S2 represents off-state working time (run-timedisconnect); S3 represents off-state (disconnect).
Prior art, when USB switches between S1 and S0, just utilize the time-out of usb bus (suspend), restart the behavior that (resume) and Remote Wake Up (remotewakeup) these behaviors come on control bus, do not touch the internal logic of USB Physical layer (PHY) and controller (Controller), wherein most of logic can turn off when USB is idle, recovers when USB recovers.If USBPHY and controller (Controller) are turned off and Recovery processing, so just can not rely on usb bus itself, because now PHY turns off, and must through the process of re-enumeration, for modulator-demodular unit (modem) this equipment complex, this process is more consuming time, after tested about about 500ms, this is delayed system greatly from dormancy to the time of waking up, reduces the reliability of system.
Therefore, in order to ensure the shortest wakeup time while can reducing the more power consumptions of usb bus, the embodiment of the present invention adds S2 state, with by S2 and S0, conversion between S1, S3, solves above-mentioned technical matters.Concrete, be described with reference to following embodiment.
The schematic diagram of a kind of usb bus state switching method that Fig. 1 provides for the embodiment of the present invention, this figure illustrates when usb bus can switch to S2 mentioned above under what circumstances, and realizes those functions at S2, and with reference to Fig. 1, the method comprises the steps:
Step 100, when being in entire system bus suspension or Idle state exceedes very first time threshold value, being then electricity under the Physical layer PHY of USB, the controller (Controller) of USB being set to battery saving mode, and reservation of resource;
Concrete, the resource of reservation is to waking relevant resource up with dormancy.Such as USB enumerates the information, address, configuration information etc. of equipment, and these resources are all that in USB enumeration process, modulator-demodular unit reports AP, and retaining these resources can save wakeup time.
Step 101, receive that application processor AP sends first wake instruction up, send described first to modulator-demodular unit (Modem) and wake instruction up.
The usb bus state switching method that the embodiment of the present invention provides, by when being in entire system bus suspension or Idle state exceedes very first time threshold value, it is then electricity under the Physical layer PHY of USB, the controller of USB is set to battery saving mode, and reservation of resource, receive application processor AP transmission again first wakes instruction up, sends described first wake instruction up to modulator-demodular unit.Although electricity under achieving the Physical layer PHY to USB, and the controller of USB is set to battery saving mode, but when AP wakes modulator-demodular unit up by usb bus, because usb bus remains the related resource for waking up, thus avoid the process of re-enumeration in prior art, thus reduce from dormancy to the time of waking up, improve system stability.
Further, on the basis of Fig. 1, also comprise:
When the duration that electricity and the controller of described USB are set to battery saving mode under the PHY of described USB is more than the second time threshold, then discharge described resource;
Wherein, described second time threshold is greater than described very first time threshold value.
Further, described first wake up instruction comprise arrange address instruction and arrange configuration instruction.
The schematic diagram of the another kind of usb bus state switching method that Fig. 2 provides for the embodiment of the present invention, with reference to Fig. 2, is described further the function of usb bus under above-mentioned switching between S0, S1, S2, S3 and each state.
S2 is as the state newly increased, in this condition, to electricity under the Phy of USB, and USB controller is set to battery saving mode, in this mode, USB drives and also retains original resource and do not discharge, and during from this mode wakeup, AP wakes first of modulator-demodular unit up and wakes instruction up and only need to comprise to arrange address instruction (set_address) and arrange configuration and indicate (set_configuration).Thus return to S0 state with the shortest time.After to electricity under Phy, in fact USB is in off-state, so after S2 state is more than 10s (this time can determine according to modulator-demodular unit concrete condition), allow USB be set to S3, free system resources, the process that the process from S3 to S0 is inserted with USB is the same.After electricity under the Phy of USB, wake operation must rely on external interface, so will increase two-way universal input/output on hardware, (GeneralPurposeInputOutput, is called for short: GPIO), initiates AP respectively and wakes the operation that modulator-demodular unit and modulator-demodular unit wake AP up up.S0 switches to S1 state by suspending (run-timesuspend) working time, and contrary S1 switches to S0 state by restarting (run-timeresume) working time.S1 switches to S2: in system hibernates situation, and S1 state more than 3s (this time can determine according to modulator-demodular unit concrete condition), or switches to S2 by entire system bus suspension (Systemsuspend) operation from S1.
Fig. 3 is usb bus power consumption contrast schematic diagram, and Fig. 4 is USB wakeup time contrast schematic diagram, known with reference to Fig. 3 and Fig. 4, adopts the scheme of the embodiment of the present invention while guarantee wakeup time, significantly reduces the power consumption of usb bus.
The structural representation of a kind of usb bus state switching device that Fig. 5 provides for the embodiment of the present invention, this device can perform the corresponding steps of the corresponding embodiment of Fig. 1 or Fig. 2, realize identical technique effect, this device can be terminal device, such as, mobile phone, panel computer etc., with reference to Fig. 5, this device comprises: processing module 100, receiver module 101, sending module 102.
Processing module 100, for when being in entire system bus suspension or Idle state exceedes very first time threshold value, being then electricity under the Physical layer PHY of USB, the controller (Controller) of USB is set to battery saving mode, and reservation of resource;
Receiver module 101, send for receiving application processor AP first wakes instruction up.
Sending module 102, wakes instruction up for sending described first to modulator-demodular unit.
The usb bus state switching device that the embodiment of the present invention provides, by processing module when being in entire system bus suspension or Idle state exceedes very first time threshold value, it is then electricity under the Physical layer PHY of USB, the controller of USB is set to battery saving mode, and reservation of resource, receiver module receives first of application processor AP transmission and wakes instruction up, and sending module sends described first to modulator-demodular unit and wakes instruction up.Although electricity under achieving the Physical layer PHY to USB, and the controller of USB is set to battery saving mode, but when AP wakes modulator-demodular unit up by usb bus, or, when modulator-demodular unit wakes AP up by usb bus, because usb bus remains the related resource for waking up, thus avoid the process of re-enumeration in prior art, thus reduce from dormancy to the time of waking up, improve system stability.
Further, processing module 100, also for be set to battery saving mode when electricity and the controller of described USB under the PHY of described USB duration more than the second time threshold time, then discharge described resource;
Wherein, described second time threshold is greater than described very first time threshold value.
Further, described first wake up instruction comprise arrange address instruction and arrange configuration instruction.
The inner AP of the usb bus state switching device that Fig. 6 provides for the embodiment of the present invention and modulator-demodular unit connection diagram, reference Fig. 6, this device comprises and comprises AP, modulator-demodular unit, and wherein AP inside also comprises modem interface subsystem; Modem interface subsystem is connected with modulator-demodular unit by usb bus.
Concrete, such as, AP side uses Android4.2 operating system.At USB drive part, the code in amendment USBcore and USBhub, adds S2 state and correlative code logic; In HCD part, operation when adding dormancy awakening, Phy and the controller of USB being turned off and recovered; In entire system bus suspension (Systemsuspend) and restarting process, add the operation to GPIO.Wherein, also comprise AP and initiate to wake up to modulator-demodular unit, or modulation volume detuner is initiated abbot to AP and waken up
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that programmed instruction is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a usb bus state switching method, is characterized in that, comprising:
When being in entire system bus suspension or Idle state exceedes very first time threshold value, being then electricity under the Physical layer PHY of USB, the controller of USB is set to battery saving mode, and reservation of resource;
Receive application processor AP transmission first wakes instruction up, sends described first wake instruction up to modulator-demodular unit.
2. method according to claim 1, is characterized in that, also comprises:
When the duration that electricity and the controller of described USB are set to battery saving mode under the PHY of described USB is more than the second time threshold, then discharge described resource;
Wherein, described second time threshold is greater than described very first time threshold value.
3. method according to claim 1 and 2, is characterized in that, described first wake up instruction comprise arrange address instruction and arrange configuration instruction.
4. a usb bus state switching device, is characterized in that, comprising:
Processing module, for when being in entire system bus suspension or Idle state exceedes very first time threshold value, being then electricity under the Physical layer PHY of USB, the controller of USB is set to battery saving mode, and reservation of resource;
Receiver module, send for receiving application processor AP first wakes instruction up;
Sending module, wakes instruction up for sending described first to described modulator-demodular unit.
5. device according to claim 4, is characterized in that, described processing module, also for be set to battery saving mode when electricity and the controller of described USB under the PHY of described USB duration more than the second time threshold time, then discharge described resource;
Wherein, described second time threshold is greater than described very first time threshold value.
6. the device according to claim 4 or 5, is characterized in that, described first wake up instruction comprise arrange address instruction and arrange configuration instruction.
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| CN201410436123.XA CN105446916B (en) | 2014-08-29 | 2014-08-29 | USB bus state switching method and device |
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| CN106507454A (en) * | 2016-10-31 | 2017-03-15 | 努比亚技术有限公司 | A kind of wake-up control method and terminal |
| WO2018010430A1 (en) * | 2016-07-13 | 2018-01-18 | 中兴通讯股份有限公司 | Control method, device, circuit, and data card |
| CN107678530A (en) * | 2017-08-29 | 2018-02-09 | 芯启源电子科技有限公司 | USB low power consumpting states exit method, USB electronic installations and communication system |
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| CN114416190A (en) * | 2022-01-19 | 2022-04-29 | 深圳市诠云科技有限公司 | USB linkage dormancy awakening circuit for android device and computer |
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| CN114416190A (en) * | 2022-01-19 | 2022-04-29 | 深圳市诠云科技有限公司 | USB linkage dormancy awakening circuit for android device and computer |
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