TDA2PXEVM: Use of utility links to support switching channel in VPE

Norman S.

Part Number: TDA2PXEVM

Hello,

Is is possible to perform changing of channel on an arbitrary link during runtime?

The Display link has this function in itself, but is it possible to perform it on other links.
For example:

NullSource (IPU1_0) -> Gate_Idle -> Merge -> Select -> VPE -> XXXXSink

IssCapture -> IssM2mIsp -> Gate_Cam -> Merge

IssM2mIsp -> Alg_IssAewb

In the above chain, the link XXXSink only supports single channel.
But to support multiple paths, I am planning on using Select link to specify which outgoing channel will be in channel ID 0.

Unfortunately, it does not seem to work at runtime.

Sorry for the fundamental inquiry but I appreciate the help to point me in the right direction.

over 5 years ago

0 Anuj Gupta over 5 years ago

TI__Genius 15985 points

Hi,

Please refer to any usecase where select link is used.

By using this link you can change input channel to your custom link at run time.

Regards,

Anuj

0 Norman S. over 5 years ago in reply to Anuj Gupta

Intellectual 690 points

Hello Anuj,

None of the usecase shows switching of channel during run-time, all of them switches the channel forwarding on create time.

I checked the following:

iss_mult_capture_isp_simcop_stereo_tda3xx
csi2_cal_sv_standalone
iss_mult_capture_isp_dewarp_3dsv_rearview_tda3xx
iss_multi_inst_capture_display
lvds_vip_multi_cam_view_tda3xx

The use case I am using is updated to :

NullSource (IPU1_0) -> Select_Idle -> Merge -> VPE -> XXXSink

IssCapture -> IssM2mIsp -> Select_Cam -> Merge

IssM2mIsp -> Alg_IssAewb

I replace the Gate Link with the Select link and remove the Select after merge.
The switching of channel is as follows:

static void setSelectLinkParams(SelectLink_CreateParams *pShow, SelectLink_CreateParams *pHide)
{
        if(pShow){
                pShow->numOutQue                  = 1U;
                pShow->outQueChInfo[0].outQueId   = 0;
                pShow->outQueChInfo[0].numOutCh   = 1;
                pShow->outQueChInfo[0].inChNum[0] = 0;
        }
        if(pHide){
                pHide->numOutQue                  = 1U;
                pHide->outQueChInfo[0].outQueId   = 0;
                pHide->outQueChInfo[0].numOutCh   = 0;
                pHide->outQueChInfo[0].inChNum[0] = 0;
        }
}

It does perform the switch during create time.
But after the chain is started, calling the function above to switch the channels is not working.

What I am inquiring in this ticket is if it is possible to switch during runtime similar to what Display link is doing with DISPLAY_LINK_CMD_SWITCH_CH,
by using Select Link or other links that are available without me modifying the XXXSink link code.

Regards,
Norman

0 Anuj Gupta over 5 years ago in reply to Norman S.

TI__Genius 15985 points

Hi,

If you send SELECT_LINK_CMD_SET_OUT_QUE_CH_INFO cmd to select link with proper input , then you will be able to switch channel run time.

Please check below function for 8 cam usecase

chains_lvdsVip8Cam_Display_SwitchDisplayChannel()

Regards,

Anuj

0 Norman S. over 5 years ago in reply to Anuj Gupta

Intellectual 690 points

Thank you Anuj for the support this resolves my problem.

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TDA2PXEVM: Use of utility links to support switching channel in VPE