drm/msm/dsi: Use MSM and DRM DSC helper methods

Use MSM and DRM DSC helper methods to configure DSC for DSI.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/539274/
Link: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v14-8-bafc7be95691@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -28,6 +28,7 @@
 #include "dsi.xml.h"
 #include "sfpb.xml.h"
 #include "dsi_cfg.h"
+#include "msm_dsc_helper.h"
 #include "msm_kms.h"
 #include "msm_gem.h"
 #include "phy/dsi_phy.h"
@@ -845,7 +846,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
 	/* first calculate dsc parameters and then program
 	 * compress mode registers
 	 */
-	slice_per_intf = DIV_ROUND_UP(hdisplay, dsc->slice_width);
+	slice_per_intf = msm_dsc_get_slices_per_intf(dsc, hdisplay);
 
 	/*
 	 * If slice_count is greater than slice_per_intf
@@ -1756,7 +1757,7 @@ static int dsi_populate_dsc_params(struct msm_dsi_host *msm_host, struct drm_dsc
 		return ret;
 	}
 
-	dsc->initial_scale_value = 32;
+	dsc->initial_scale_value = drm_dsc_initial_scale_value(dsc);
 	dsc->line_buf_depth = dsc->bits_per_component + 1;
 
 	return drm_dsc_compute_rc_parameters(dsc);