drm/msm/dpu: modify timing engine programming for YUV420 over DP

Adjust the encoder timing engine setup programming in the case of video
mode for YUV420 over DP to accommodate CDM.

Changes in v3:
	- Move drm_display_mode's hskew division to another patch
	- Minor cleanup

Changes in v2:
	- Move timing engine programming to this patch
Signed-off-by: Paloma Arellano <quic_parellan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/579634/
Link: https://lore.kernel.org/r/20240222194025.25329-18-quic_parellan@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c

@@ -236,7 +236,7 @@ static void dpu_encoder_phys_vid_setup_timing_engine(
 	struct drm_display_mode mode;
 	struct dpu_hw_intf_timing_params timing_params = { 0 };
 	const struct dpu_format *fmt = NULL;
-	u32 fmt_fourcc = DRM_FORMAT_RGB888;
+	u32 fmt_fourcc;
 	unsigned long lock_flags;
 	struct dpu_hw_intf_cfg intf_cfg = { 0 };
 
@@ -255,7 +255,9 @@ static void dpu_encoder_phys_vid_setup_timing_engine(
 	DPU_DEBUG_VIDENC(phys_enc, "enabling mode:\n");
 	drm_mode_debug_printmodeline(&mode);
 
-	if (phys_enc->split_role != ENC_ROLE_SOLO) {
+	fmt_fourcc = dpu_encoder_get_drm_fmt(phys_enc);
+
+	if (phys_enc->split_role != ENC_ROLE_SOLO || fmt_fourcc == DRM_FORMAT_YUV420) {
 		mode.hdisplay >>= 1;
 		mode.htotal >>= 1;
 		mode.hsync_start >>= 1;
@@ -275,6 +277,8 @@ static void dpu_encoder_phys_vid_setup_timing_engine(
 	fmt = dpu_get_dpu_format(fmt_fourcc);
 	DPU_DEBUG_VIDENC(phys_enc, "fmt_fourcc 0x%X\n", fmt_fourcc);
 
+	if (phys_enc->hw_cdm)
+		intf_cfg.cdm = phys_enc->hw_cdm->idx;
 	intf_cfg.intf = phys_enc->hw_intf->idx;
 	intf_cfg.intf_mode_sel = DPU_CTL_MODE_SEL_VID;
 	intf_cfg.stream_sel = 0; /* Don't care value for video mode */