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drm/i915/dp: Reprobe connector if getting/acking link service IRQs fails

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An AUX access failure during HPD IRQ handling should be handled by
falling back to a full connector detection, ensure that if the failure
happens while reading/acking a link service IRQ.

While at it add code comment documenting the return value of
intel_dp_check_link_service_irq().

v2: Docuement intel_dp_check_link_service_irq()'s return value. (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-13-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-02-25 18:46:10 +02:00
parent 288b3c518f
commit 81e4161dd8
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/i915/display/intel_dp.c
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@ -5816,6 +5816,11 @@ static bool intel_dp_check_device_service_irq(struct intel_dp *intel_dp)
return false;
}
/*
* Return %true if a full connector reprobe is required due to a failure while
* reading or acking the link service IRQs or if the reprobing is required
* after handling a link service IRQ event.
*/
static bool intel_dp_check_link_service_irq(struct intel_dp *intel_dp)
{
struct intel_display *display = to_intel_display(intel_dp);
@ -5826,12 +5831,15 @@ static bool intel_dp_check_link_service_irq(struct intel_dp *intel_dp)
return false;
if (drm_dp_dpcd_readb(&intel_dp->aux,
DP_LINK_SERVICE_IRQ_VECTOR_ESI0, &val) != 1 || !val)
DP_LINK_SERVICE_IRQ_VECTOR_ESI0, &val) != 1)
return true;
if (!val)
return false;
if (drm_dp_dpcd_writeb(&intel_dp->aux,
DP_LINK_SERVICE_IRQ_VECTOR_ESI0, val) != 1)
return false;
return true;
if (val & RX_CAP_CHANGED)
reprobe_needed = true;