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

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

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 4ecf5f6699f6621e5cb5fd1a5095c8661b2ce8fe..f04f15e1584906dadb9888c40aefe32f8d3b114f 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -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;