While using DSC the compressed bpp is computed assuming RGB output
format. Consider the output_format and compute the compressed bpp
during mode valid and compute config steps.
For DP-MST we currently use RGB output format only, so continue
using RGB while computing compressed bpp for MST case.
v2: Use output_bpp instead for pipe_bpp to clamp compressed_bpp. (Ville)
Signed-off-by: Ankit Nautiyal <ankit.k.nauti...@intel.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 19 +++++++++++++++++--
drivers/gpu/drm/i915/display/intel_dp.h | 1 +
drivers/gpu/drm/i915/display/intel_dp_mst.c | 1 +
3 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
b/drivers/gpu/drm/i915/display/intel_dp.c
index 0cc57681dc4d..263c30948117 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -734,6 +734,7 @@ u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private
*i915,
u32 link_clock, u32 lane_count,
u32 mode_clock, u32 mode_hdisplay,
bool bigjoiner,
+ enum intel_output_format output_format,
u32 pipe_bpp,
u32 timeslots)
{
@@ -758,6 +759,10 @@ u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private
*i915,
bits_per_pixel = ((link_clock * lane_count) * timeslots) /
(intel_dp_mode_to_fec_clock(mode_clock) * 8);
+ /* Bandwidth required for 420 is half, that of 444 format */
+ if (output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
+ bits_per_pixel *= 2;
+
drm_dbg_kms(&i915->drm, "Max link bpp is %u for %u timeslots "
"total bw %u pixel clock %u\n",
bits_per_pixel, timeslots,
@@ -1151,11 +1156,16 @@ intel_dp_mode_valid(struct drm_connector *_connector,
if (HAS_DSC(dev_priv) &&
drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
+ enum intel_output_format sink_format, output_format;
+ int pipe_bpp;
+
+ sink_format = intel_dp_sink_format(connector, mode);
+ output_format = intel_dp_output_format(connector, sink_format);
/*
* TBD pass the connector BPC,
* for now U8_MAX so that max BPC on that platform would be
picked
*/
- int pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, U8_MAX);
+ pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, U8_MAX);
/*
* Output bpp is stored in 6.4 format so right shift by 4 to
get the
@@ -1175,6 +1185,7 @@ intel_dp_mode_valid(struct drm_connector *_connector,
target_clock,
mode->hdisplay,
bigjoiner,
+ output_format,
pipe_bpp, 64) >> 4;
dsc_slice_count =
intel_dp_dsc_get_slice_count(intel_dp,
@@ -1707,6 +1718,7 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
adjusted_mode->crtc_clock,
adjusted_mode->crtc_hdisplay,
pipe_config->bigjoiner_pipes,
+
pipe_config->output_format,
pipe_bpp,
timeslots);
/*
@@ -1742,9 +1754,12 @@ int intel_dp_dsc_compute_config(struct intel_dp
*intel_dp,
* calculation procedure is bit different for MST case.
*/
if (compute_pipe_bpp) {
+ u16 output_bpp =
intel_dp_output_bpp(pipe_config->output_format,
+
pipe_config->pipe_bpp);
+
pipe_config->dsc.compressed_bpp = min_t(u16,
dsc_max_output_bpp >> 4,
-
pipe_config->pipe_bpp);
+ output_bpp);
}
pipe_config->dsc.slice_count = dsc_dp_slice_count;
drm_dbg_kms(&dev_priv->drm, "DSC: compressed bpp %d slice count
%d\n",
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h
b/drivers/gpu/drm/i915/display/intel_dp.h
index ef39e4f7a329..db86c2b71c1f 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -107,6 +107,7 @@ u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private
*i915,
u32 link_clock, u32 lane_count,
u32 mode_clock, u32 mode_hdisplay,
bool bigjoiner,
+ enum intel_output_format output_format,
u32 pipe_bpp,
u32 timeslots);
u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 63d61e610210..ee28bb89bffe 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -973,6 +973,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
target_clock,
mode->hdisplay,
bigjoiner,
+
INTEL_OUTPUT_FORMAT_RGB,
pipe_bpp, 64) >> 4;
dsc_slice_count =
intel_dp_dsc_get_slice_count(intel_dp,
--
2.25.1
