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drm/i915/dp_mst: Use the correct connector while computing the link BPP limit on MST

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Atm, on an MST link in DSC mode
intel_dp_compute_config_link_bpp_limits() calculates the maximum link
bpp limit using the MST root connector's DSC capabilities. That's not
correct in general: the decompression could be performed by a branch
device downstream of the root branch device or the sink itself.

Fix the above by passing to intel_dp_compute_config_link_bpp_limits()
the actual connector being modeset, containing the correct DSC
capabilities.

Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Fixes: 1c5b72daff ("drm/i915/dp: Set the DSC link limits in intel_dp_compute_config_link_bpp_limits")
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250509180340.554867-2-imre.deak@intel.com
This commit is contained in:
Imre Deak
2025-05-09 21:03:28 +03:00
parent c58af5cd9c
commit 266e2fcfe2
3 changed files with 8 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/i915/display/intel_dp.c
View File

@@ -2524,6 +2524,7 @@ intel_dp_dsc_compute_pipe_bpp_limits(struct intel_dp *intel_dp,
bool
intel_dp_compute_config_limits(struct intel_dp *intel_dp,
struct intel_connector *connector,
struct intel_crtc_state *crtc_state,
bool respect_downstream_limits,
bool dsc,
@@ -2577,7 +2578,7 @@ intel_dp_compute_config_limits(struct intel_dp *intel_dp,
intel_dp_test_compute_config(intel_dp, crtc_state, limits);
return intel_dp_compute_config_link_bpp_limits(intel_dp,
intel_dp->attached_connector,
connector,
crtc_state,
dsc,
limits);
@@ -2638,7 +2639,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
joiner_needs_dsc = intel_dp_joiner_needs_dsc(display, num_joined_pipes);
dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
!intel_dp_compute_config_limits(intel_dp, pipe_config,
!intel_dp_compute_config_limits(intel_dp, connector, pipe_config,
respect_downstream_limits,
false,
&limits);
@@ -2672,7 +2673,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
str_yes_no(ret), str_yes_no(joiner_needs_dsc),
str_yes_no(intel_dp->force_dsc_en));
if (!intel_dp_compute_config_limits(intel_dp, pipe_config,
if (!intel_dp_compute_config_limits(intel_dp, connector, pipe_config,
respect_downstream_limits,
true,
&limits))

1
drivers/gpu/drm/i915/display/intel_dp.h
View File

@@ -194,6 +194,7 @@ void intel_dp_wait_source_oui(struct intel_dp *intel_dp);
int intel_dp_output_bpp(enum intel_output_format output_format, int bpp);
bool intel_dp_compute_config_limits(struct intel_dp *intel_dp,
struct intel_connector *connector,
struct intel_crtc_state *crtc_state,
bool respect_downstream_limits,
bool dsc,

5
drivers/gpu/drm/i915/display/intel_dp_mst.c
View File

@@ -599,12 +599,13 @@ adjust_limits_for_dsc_hblank_expansion_quirk(struct intel_dp *intel_dp,
static bool
mst_stream_compute_config_limits(struct intel_dp *intel_dp,
const struct intel_connector *connector,
struct intel_connector *connector,
struct intel_crtc_state *crtc_state,
bool dsc,
struct link_config_limits *limits)
{
if (!intel_dp_compute_config_limits(intel_dp, crtc_state, false, dsc,
if (!intel_dp_compute_config_limits(intel_dp, connector,
crtc_state, false, dsc,
limits))
return false;