Hi, TI support team.
I have a DSI interface problem In ti-processor-sdk-rtos-j721e-evm-08_02_00_05.
The DSI interface could be able to output the signeal with below DSI parameter configuration
(dssDctrlUpdateVideoSizeConfig function in "pdk_jacinto_08_02_00_21/packages/ti/drv/dss/src/drv/dctrl/dss_dctrlDsi.c"
horzTotal = mInfo->width + mInfo->hFrontPorch + mInfo->hBackPorch + mInfo->hSyncLen;
dsiObj->videoSizeCfg.vact = mInfo->height; //[720]
dsiObj->videoSizeCfg.vfp = 1; //[1]
dsiObj->videoSizeCfg.vbp = mInfo->vBackPorch; //[20]
dsiObj->videoSizeCfg.vsa = mInfo->vSyncLen; //[5]
dsiObj->videoSizeCfg.hsa = (mInfo->hSyncLen * BPP) - 14; //[106]
dsiObj->videoSizeCfg.hbp = (mInfo->hBackPorch * BPP) - 12; //[648]
dsiObj->videoSizeCfg.rgb = mInfo->width * BPP; //[3840]
dsiObj->videoSizeCfg.hfp = (mInfo->hFrontPorch * BPP) - 6; //[324]
dsiObj->videoSizeCfg.blkLinePulsePacket = (horzTotal * BPP) - 20 - dsiObj->videoSizeCfg.hsa; //[4824] ( 1280 + 110 + 220 + 40 ) * BPP - 20 - dsiObj->videoSizeCfg.hsa;
But this configuration is for the FPD Link Serializer to display on the LCD side.
I re-configurate the DSI parameter with standard VESA parameter as blow.
uint32_t horzTotal;
horzTotal = mInfo->width + mInfo->hFrontPorch + mInfo->hBackPorch + mInfo->hSyncLen;
dsiObj->videoSizeCfg.vact = 720;
dsiObj->videoSizeCfg.vfp = 5;
dsiObj->videoSizeCfg.vbp = 20;
dsiObj->videoSizeCfg.vsa = 5;
dsiObj->videoSizeCfg.hsa = ( 40 * BPP );
dsiObj->videoSizeCfg.hbp = ( 220 * BPP );
dsiObj->videoSizeCfg.rgb = (1280 * BPP );
dsiObj->videoSizeCfg.hfp = ( 110 * BPP );
dsiObj->videoSizeCfg.blkLinePulsePacket = (horzTotal * BPP);
After modification, the DSI interface data lane have no any signal.
Do I miss something for the configuration?
And how to calculate the "blkLinePulsePacket" value?
