disp: msm: dp: fix bpp to 24 in TU calc for SST DSC

When using the TU calculator for SST DSC usecase, the calculator
expects the bpp to be 24 irrespective of the actual panel bpp.

Change-Id: Ifdab2c00a2a99b4d7d7dea7eadb33bc34e3cfa8b
Signed-off-by: Rajkumar Subbiah <quic_rsubbia@quicinc.com>

msm/dp/dp_panel.c

@@ -392,7 +392,7 @@ static void dp_panel_update_tu_timings(struct dp_tu_calc_input *in,
 	tu->orig_lwidth          = in->hactive;
 	tu->hbp_relative_to_pclk_fp = drm_fixp_from_fraction(in->hporch, 1);
 	tu->orig_hbp             = in->hporch;
-	tu->rb2                  = (in->hporch <= 80) ? 1 : 0;
+	tu->rb2                  = (in->hporch < 160) ? 1 : 0;
 
 	if (tu->pixelEnc == 420) {
 		temp1_fp = drm_fixp_from_fraction(2, 1);
@@ -423,6 +423,8 @@ static void dp_panel_update_tu_timings(struct dp_tu_calc_input *in,
 	if (!in->dsc_en)
 		goto fec_check;
 
+	tu->bpp = 24; // hardcode to 24 if DSC is enabled.
+
 	temp1_fp = drm_fixp_from_fraction(in->compress_ratio, 100);
 	temp2_fp = drm_fixp_from_fraction(in->bpp, 1);
 	temp3_fp = drm_fixp_div(temp2_fp, temp1_fp);