[PATCH v3 20/20] drm/i915/dp: Ack only the handled link service IRQs

[Imre Deak <imre.deak@intel.com>]

Ack only those SST link service IRQs that will be handled, similarly to
device service IRQs. While at it add asserts that only the known/acked
link service IRQs are handled both in the MST and SST case.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 866aeeb8f4614..b2fe0841ea420 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -4924,6 +4924,16 @@ intel_dp_mst_disconnect(struct intel_dp *intel_dp)
 						 DP_DOWN_REP_MSG_RDY | \
 						 DP_UP_REQ_MSG_RDY)
 
+#define INTEL_DP_LINK_SERVICE_IRQ_MASK_SST	(RX_CAP_CHANGED | \
+						 LINK_STATUS_CHANGED | \
+						 HDMI_LINK_STATUS_CHANGED | \
+						 CONNECTED_OFF_ENTRY_REQUESTED | \
+						 DP_TUNNELING_IRQ)
+
+#define INTEL_DP_LINK_SERVICE_IRQ_MASK_MST	(RX_CAP_CHANGED | \
+						 LINK_STATUS_CHANGED | \
+						 DP_TUNNELING_IRQ)
+
 static bool
 intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *esi)
 {
@@ -5022,6 +5032,7 @@ static bool intel_dp_get_and_ack_sink_irq_esi_sst(struct intel_dp *intel_dp, u8
 		    esi);
 
 	esi[1] &= INTEL_DP_DEVICE_SERVICE_IRQ_MASK_SST;
+	esi[3] &= INTEL_DP_LINK_SERVICE_IRQ_MASK_SST;
 
 	if (mem_is_zero(&esi[1], 3))
 		return true;
@@ -5560,7 +5571,7 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp)
 
 		drm_dbg_kms(display->drm, "DPRX ESI: %4ph\n", esi);
 
-		ack[3] |= esi[3] & (RX_CAP_CHANGED | LINK_STATUS_CHANGED | DP_TUNNELING_IRQ);
+		ack[3] |= esi[3] & INTEL_DP_LINK_SERVICE_IRQ_MASK_MST;
 
 		intel_dp_mst_hpd_irq(intel_dp, esi, ack);
 
@@ -5568,6 +5579,7 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp)
 			break;
 
 		drm_WARN_ON(display->drm, ack[1] & ~INTEL_DP_DEVICE_SERVICE_IRQ_MASK_MST);
+		drm_WARN_ON(display->drm, ack[3] & ~INTEL_DP_LINK_SERVICE_IRQ_MASK_MST);
 
 		if (!intel_dp_ack_sink_irq_esi(intel_dp, ack))
 			drm_dbg_kms(display->drm, "Failed to ack ESI\n");
@@ -5877,6 +5889,9 @@ static bool intel_dp_handle_link_service_irq(struct intel_dp *intel_dp, u8 irq_m
 	struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
 	bool reprobe_needed = false;
 
+	drm_WARN_ON(display->drm, irq_mask & ~(INTEL_DP_LINK_SERVICE_IRQ_MASK_SST |
+					       INTEL_DP_LINK_SERVICE_IRQ_MASK_MST));
+
 	if (irq_mask & RX_CAP_CHANGED)
 		reprobe_needed = true;
 
-- 
2.49.1