HPD IRQs in general should be handled after acking them. The 1. Read IRQ register (read DP_DEVICE_SERVICE_IRQ_VECTOR, DP_LINK_SERVICE_IRQ_VECTOR_ESI0) 2. Handle IRQ 3. Ack IRQ (write DP_DEVICE_SERVICE_IRQ_VECTOR, DP_LINK_SERVICE_IRQ_VECTOR_ESI0)
sequence would miss a new interrupt triggered after 2. and before 3., since the flag set in the IRQ register for this interrupt would be cleared in step 3. Fix the above by handling the IRQ after acking it. Reviewed-by: Luca Coelho <[email protected]> Signed-off-by: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/display/intel_dp.c | 27 +++++++++++-------------- 1 file changed, 12 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index b3849f1d9b7f3..bc5c318869329 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -5478,17 +5478,10 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp) drm_dbg_kms(display->drm, "DPRX ESI: %4ph\n", esi); - ack[3] |= esi[3] & LINK_STATUS_CHANGED; + ack[3] |= esi[3] & (LINK_STATUS_CHANGED | DP_TUNNELING_IRQ); intel_dp_mst_hpd_irq(intel_dp, esi, ack); - if (esi[3] & DP_TUNNELING_IRQ) { - if (drm_dp_tunnel_handle_irq(display->dp_tunnel_mgr, - &intel_dp->aux)) - reprobe_needed = true; - ack[3] |= DP_TUNNELING_IRQ; - } - if (mem_is_zero(ack, sizeof(ack))) break; @@ -5500,6 +5493,10 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp) if ((ack[3] & LINK_STATUS_CHANGED) || intel_dp->link.force_retrain) intel_dp_check_link_state(intel_dp); + + if ((ack[3] & DP_TUNNELING_IRQ) && + drm_dp_tunnel_handle_irq(display->dp_tunnel_mgr, &intel_dp->aux)) + reprobe_needed = true; } return !reprobe_needed; @@ -5802,18 +5799,18 @@ static bool intel_dp_check_link_service_irq(struct intel_dp *intel_dp) DP_LINK_SERVICE_IRQ_VECTOR_ESI0, &val) != 1 || !val) return false; + if (drm_dp_dpcd_writeb(&intel_dp->aux, + DP_LINK_SERVICE_IRQ_VECTOR_ESI0, val) != 1) + return false; + + if (val & HDMI_LINK_STATUS_CHANGED) + intel_dp_handle_hdmi_link_status_change(intel_dp); + if ((val & DP_TUNNELING_IRQ) && drm_dp_tunnel_handle_irq(display->dp_tunnel_mgr, &intel_dp->aux)) reprobe_needed = true; - if (drm_dp_dpcd_writeb(&intel_dp->aux, - DP_LINK_SERVICE_IRQ_VECTOR_ESI0, val) != 1) - return reprobe_needed; - - if (val & HDMI_LINK_STATUS_CHANGED) - intel_dp_handle_hdmi_link_status_change(intel_dp); - return reprobe_needed; } -- 2.49.1
