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* [PATCH] drm/i915/dp: Limit SST link rate to <=8.1Gbps
@ 2024-02-08 15:45 Ville Syrjala
  2024-02-08 15:55 ` Jani Nikula
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Ville Syrjala @ 2024-02-08 15:45 UTC (permalink / raw)
  To: intel-gfx; +Cc: stable

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Limit the link rate to HBR3 or below (<=8.1Gbps) in SST mode.
UHBR (10Gbps+) link rates require 128b/132b channel encoding
which we have not yet hooked up into the SST/no-sideband codepaths.

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index ab415f41924d..5045c34a16be 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2356,6 +2356,9 @@ intel_dp_compute_config_limits(struct intel_dp *intel_dp,
 	limits->min_rate = intel_dp_common_rate(intel_dp, 0);
 	limits->max_rate = intel_dp_max_link_rate(intel_dp);
 
+	/* FIXME 128b/132b SST support missing */
+	limits->max_rate = min(limits->max_rate, 810000);
+
 	limits->min_lane_count = 1;
 	limits->max_lane_count = intel_dp_max_lane_count(intel_dp);
 
-- 
2.43.0


^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2024-02-09  5:25 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-02-08 15:45 [PATCH] drm/i915/dp: Limit SST link rate to <=8.1Gbps Ville Syrjala
2024-02-08 15:55 ` Jani Nikula
2024-02-08 23:05 ` ✓ Fi.CI.BAT: success for " Patchwork
2024-02-09  5:25 ` ✗ Fi.CI.IGT: failure " Patchwork

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