Linux/TDA2EVM5777: Can camera capture and audio playback work simultaneously TDA2x EVM ?

Hi Uday,

If you're using Vision-SDK Linux configuration, audio playback and video capture will not work simultaneously due to I2C constraints. 

If the use-case is only to capture video, Linux has support for the following Omni-Vision cameras. Capture can be performed from Linux without using Vision-SDK. In this case, I2C-2 is owned by Linux and can be used for audio as well.

http://processors.wiki.ti.com/index.php?title=Processor_SDK_Linux_Automotive_Software_Developers_Guide#Supported_cameras

Regards

Shravan

Thanks for clarification, we need to do processing of captured frames on EVE and/or DSP using TIDL.
Hence we can't use PSDK.


Based on your reply we understand it as follows :

0. This is definitely not a board issue, Audio  playback and Camera capture using Multides as well as visionboard camera is possible

1. For GLSDK / PSDK
     Linux on A15 has enabled  Audio  and  camera - Vision board based omni-vision  - using I2C2  and both device can function concurrently.
 
2. For VisionSDK,
  2.1 Linux completely disables the I2C from DTB file so that I2C2 controller is used from IPU.
         This results into disabling I2C IO Expander (U119) and hence audio from SoC over mcasp doesn't reach to codec tlv320aic3106a
 
2.2 VisionSDK does NOT have audio enabled from BSP i.e VIN6_SEL_S0 is high.

    Following BSP code from IPU indicates this
     File :  PROCESSOR_SDK_VISION_03_03_00_00/ti_components/drivers/pdk_01_09_00_17/packages/ti/drv/vps/src/boards/src/bsp_boardTda2xx.c +1042

             /* Set VIN6_SEL_S0 & CAM_FPD_MUX_S0 to 1 */
                        regValueTemp = ((UInt32) regValue[0U] |
                                        (BOARD_PCF8575_VIN6_SEL));
                        regValue[0U] = (UInt8) regValueTemp;
                        regValueTemp =
                            ((UInt32) regValue[0U] |
                            (BOARD_PCF8575_CAM_FPD_MUX_S0));
                        regValue[0U] = (UInt8) regValueTemp;
 
  2.3 VisionSDK does set camera configuration from IPU BSP .
  2.4 Linux on A15 has all the required audio support and audio card is already detected using aplay -l but  audio is not heard as VIN6_SEL_S0 is HIGH.
  2.5 I2C2 has to be controlled from IPU side  only . (Enable is from Linux will not work)

Based on above understanding, can you let us know if following configuration/steps would  enable audio from Linux.

3.  Possible  Approach
----------------------------------------------
3.1 IPU continue to control I2C
3.2 No changes to dra7x-infoadas.dtb i.e disable I2C2 from A15/Linux
3.3 Modify IPU side BSP code to set  Bit “P1” in I2C IO Expander (U119) with slave address to set "VIN6_SEL_S0" LOW.

3.4 Since I2C2 is controlling from IPU only, there should not be any issue conflict issue.
      [ This is based on #2 from above - where PSDK confirms that Audio +  Camera configured using I2C2 from A15 works concurrently ]

3.5 If  "VIN6_SEL_S0" LOW from IPU side, rest all Linux audio stack, MCASP3 driver and Codec tlv320aic3106a is in enabled in Linux BSP.
        Everything should work from A15 and audio playback should happen.
      [ This is based on the observation that, dra7x-infoadas.dtb disabled only I2C2  and this disables pulling down  VIN6_SEL_S0" to LOW ].

In short, if IPU side BSP controls I2C2 and enables VIN6_SEL_S0" to  LOW,  audio playback from A15 should be possible ?

Queries:
-------------
Q1. Can you please confirm if above approach mention in #3 would enable audio playback from A15 ?
Q2. Is there any compile / build time configuration that can enable audio from IPU ?
Q3. Following portion of DTB that gets disabled from Linux when DISABLE_COMPLETE(i2C2) is done.

       pcf_hdmi: gpio@26 {
                compatible = "nxp,pcf8575";
                reg = <0x26>;
                gpio-controller;
                #gpio-cells = <2>;
                vin6_brdmux: p1 {
                        /* vin6_sel_s0: high: VIN6, low: audio */
                        gpio-hog;
                        gpios = <1 GPIO_ACTIVE_HIGH>;
                        output-low;
                        line-name = "vin6_sel_s0";
                };
        };

So if we add similar functionality corresponding to above code from IPU side, would it enable Audio playback from A15 ?

Thanks.