TIDEP-01002: 1280x720 HDMI display by VisionSDK DSS not correct

hi all experts,

my EVM board is TIDEP-01002, now we have a projector, it support HDMI 1280x720 input.

and we run visionSDK 0304 on M4 core to control the DSS, and linux side graphy image by VDRM.

now we have the problem of projector can not show image correctly.

i create pipeline as following, use VID2 to display. 

DispDistSrc_Infotainment-> Display_vid2

i set the VDRM in dts as following:

vdrm1: vdrm@1 {
   /* For Android presentation mode window on 720p HDMI */
   compatible = "ti,dra7-vdrm";
   vdrm1_crtc0: crtc@0 {
    compatible = "ti,dra7-vdrm-crtc";
    x-res = <1280>;
    y-res = <720>;
    refresh = <50>;
    supported-formats = <
     DT_DRM_FORMAT_RGB565   DT_DRM_FORMAT_RGBX4444 DT_DRM_FORMAT_XRGB4444
     DT_DRM_FORMAT_RGBA4444 DT_DRM_FORMAT_ARGB4444 DT_DRM_FORMAT_XRGB1555
     DT_DRM_FORMAT_ARGB1555 DT_DRM_FORMAT_RGB888   DT_DRM_FORMAT_RGBX8888
     DT_DRM_FORMAT_XRGB8888 DT_DRM_FORMAT_RGBA8888 DT_DRM_FORMAT_ARGB8888
     DT_DRM_FORMAT_NV12     DT_DRM_FORMAT_YUYV     DT_DRM_FORMAT_UYVY
    >;
   };
  };

and i set the VID2 parameters as following:

    pUcObj->Display_vid2Prm.rtParams.tarWidth         = 1280;
    pUcObj->Display_vid2Prm.rtParams.tarHeight        = 720;
    pUcObj->Display_vid2Prm.rtParams.posX             = 0;
    pUcObj->Display_vid2Prm.rtParams.posY             = 0;
    pUcObj->Display_vid2Prm.displayId                 = DISPLAY_LINK_INST_DSS_VID2;

i set the display parameters as following :

 if (pMultiPrm[i].displayType == CHAINS_DISPLAY_TYPE_HDMI_720P)
  {

   pPrm->deviceId = DISPLAYCTRL_LINK_USE_HDMI;
   pVInfo->vencId = SYSTEM_DCTRL_DSS_VENC_HDMI;
   pVInfo->outputPort = SYSTEM_DCTRL_DSS_HDMI_OUTPUT;
   pVInfo->vencOutputInfo.vsPolarity       =   SYSTEM_DCTRL_POLARITY_ACT_HIGH;
   pVInfo->vencOutputInfo.hsPolarity       =   SYSTEM_DCTRL_POLARITY_ACT_HIGH;

   /* Below are of dont care for EVM LCD */
   pVInfo->vencOutputInfo.fidPolarity      =   SYSTEM_DCTRL_POLARITY_ACT_LOW;
   pVInfo->vencOutputInfo.actVidPolarity   =   SYSTEM_DCTRL_POLARITY_ACT_HIGH;

   pVInfo->vencOutputInfo.dataFormat       =   SYSTEM_DF_RGB24_888;
   pVInfo->vencOutputInfo.dvoFormat        =
    SYSTEM_DCTRL_DVOFMT_GENERIC_DISCSYNC;
   pVInfo->vencOutputInfo.videoIfWidth     =   SYSTEM_VIFW_24BIT;

   pVInfo->vencOutputInfo.pixelClkPolarity =   SYSTEM_DCTRL_POLARITY_ACT_HIGH;
   pVInfo->vencOutputInfo.aFmt             =   SYSTEM_DCTRL_A_OUTPUT_MAX;

   pVInfo->mInfo.standard                  =   SYSTEM_STD_720P_60;

   /* Configure overlay params */

   ovlyPrms[i].vencId                        = pVInfo->vencId;
  }

and i run the ti kmscube demo,  the uncorrect show as following:

i dump the data from DispDistSrc_Infotainment link, it correct and it is 1280x720 resolution. so the problem is in display link.

(1) DSS control by M4, HDMI is 1920x1080, it can show correctly if i change the above setting for 1080p.

(2) Linux control the DSS, HDMI can show correctly (both 1920x1080p and 1280 x 720p).

(3) DSS control by M4, HDMI is 1280x720, and i setting the parameters as the above, it can not show correctly.

so could anyone give me some hints?

best regards!