From 4e75c3e208a06ad6fd9b3517fb77337460d7c2b0 Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Wed, 9 Oct 2024 14:01:35 +0300
Subject: [PATCH] drm/i915/dp_mst: Don't require DSC hblank quirk for a non-DSC
compatible mode
If an MST branch device doesn't support DSC for a given mode, but the
MST link has enough BW for the mode, assume that the branch device does
support the mode using an uncompressed stream.
Fixes: 55eaef164174 ("drm/i915/dp_mst: Handle the Synaptics HBlank expansion quirk")
Cc: stable@vger.kernel.org # v6.8+
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241009110135.1216498-2-imre.deak@intel.com
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 2822ae1160034..1a2ff3e1cb68f 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -467,6 +467,9 @@ hblank_expansion_quirk_needs_dsc(const struct intel_connector *connector,
if (mode_hblank_period_ns(adjusted_mode) > hblank_limit)
return false;
+ if (!intel_dp_mst_dsc_get_slice_count(connector, crtc_state))
+ return false;
+
return true;
}
--
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