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drm/i915/dp: Fix the device service IRQ DPCD_REV check

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The DP_DEVICE_SERVICE_IRQ_VECTOR DPCD register is supported since DPCD
REV 1.0, so read it out always. Flags added only by later DPCD revisions
are defined as reserved/must-be-zero by earlier DP Standard versions.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-10-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-02-25 18:46:07 +02:00
parent 21bd632822
commit e0f252bb36
1 changed files with 0 additions and 3 deletions
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3
drivers/gpu/drm/i915/display/intel_dp.c
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@ -5790,9 +5790,6 @@ static void intel_dp_check_device_service_irq(struct intel_dp *intel_dp)
struct intel_display *display = to_intel_display(intel_dp);
u8 val;
if (intel_dp->dpcd[DP_DPCD_REV] < 0x11)
return;
if (drm_dp_dpcd_readb(&intel_dp->aux,
DP_DEVICE_SERVICE_IRQ_VECTOR, &val) != 1 || !val)
return;