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.nautiyal@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
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 4bec8cd7979f..db710b2a6246 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -735,6 +735,7 @@ 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)
{
@@ -759,6 +760,10 @@ 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,
@@ -1152,11 +1157,16 @@ 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
@@ -1176,6 +1186,7 @@ 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,
@@ -1708,6 +1719,7 @@ 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);
/*
@@ -1743,9 +1755,12 @@ 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 5f86157a10d2..1e1cde866cd8 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -110,6 +110,7 @@ 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 6df8519b3347..1db8c8e38672 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -971,6 +971,7 @@ 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
