disp: msm: use upstream dsc config data

This change enforces dp, dsi and the sde drivers to use the
drm framework defined dsc_config data structure. As a part of this,
it introduces the sde_dsc_helper API to configure the dsc params
and creating a PPS command. Earlier each driver implemented it's
private versions leading to duplication of code. Additionaly the
helper api supports DSC spec 1.2 422 and 420 mode.

Change-Id: I25933fab08cdabbc6787079926885d1a78945e97
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>

msm/dp/dp_mst_drm.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
  */
 
 /*
@@ -527,8 +527,9 @@ static int dp_mst_calc_pbn_mode(struct dp_display_mode *dp_mode)
 	s64 pbn_fp;
 
 	dsc_en = dp_mode->timing.comp_info.comp_ratio ? true : false;
-	bpp = dsc_en ? dp_mode->timing.comp_info.dsc_info.bpp :
-		dp_mode->timing.bpp;
+	bpp = dsc_en ?
+		DSC_BPP(dp_mode->timing.comp_info.dsc_info.config)
+		: dp_mode->timing.bpp;
 
 	pbn = drm_dp_calc_pbn_mode(dp_mode->timing.pixel_clk_khz, bpp);
 	pbn_fp = drm_fixp_from_fraction(pbn, 1);