[PATCH 05/15] drm/i915/dp: Avoid left shift of DSC output bpp by 4

[Ankit Nautiyal]

To make way for fractional bpp support, avoid left shifting the
output_bpp by 4 in helper intel_dp_dsc_get_output_bpp.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c     | 12 ++++--------
 drivers/gpu/drm/i915/display/intel_dp_mst.c |  2 +-
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index cac6acbb4298..ce47d855bd4e 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -787,11 +787,7 @@ u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915,
 
 	bits_per_pixel = intel_dp_dsc_nearest_valid_bpp(i915, bits_per_pixel, pipe_bpp);
 
-	/*
-	 * Compressed BPP in U6.4 format so multiply by 16, for Gen 11,
-	 * fractional part is 0
-	 */
-	return bits_per_pixel << 4;
+	return bits_per_pixel;
 }
 
 u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
@@ -1098,7 +1094,7 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 							    target_clock,
 							    mode->hdisplay,
 							    bigjoiner,
-							    pipe_bpp, 64) >> 4;
+							    pipe_bpp, 64);
 			dsc_slice_count =
 				intel_dp_dsc_get_slice_count(intel_dp,
 							     target_clock,
@@ -1656,7 +1652,7 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 			 * restricting our target bpp to be 31.9375 at max
 			 */
 			if (pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
-				dsc_max_output_bpp = min_t(u16, dsc_max_output_bpp, 31 << 4);
+				dsc_max_output_bpp = min_t(u16, dsc_max_output_bpp, 31);
 
 			if (!dsc_max_output_bpp) {
 				drm_dbg_kms(&dev_priv->drm,
@@ -1683,7 +1679,7 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 		 */
 		if (compute_pipe_bpp) {
 			pipe_config->dsc.compressed_bpp = min_t(u16,
-								dsc_max_output_bpp >> 4,
+								dsc_max_output_bpp,
 								pipe_config->pipe_bpp);
 		}
 		pipe_config->dsc.slice_count = dsc_dp_slice_count;
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index dbc2875d1eab..e80290613edb 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -977,7 +977,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
 							    target_clock,
 							    mode->hdisplay,
 							    bigjoiner,
-							    pipe_bpp, 64) >> 4;
+							    pipe_bpp, 64);
 			dsc_slice_count =
 				intel_dp_dsc_get_slice_count(intel_dp,
 							     target_clock,
-- 
2.25.1