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From:   Kuogee Hsieh <khsieh@codeaurora.org>
To:     robdclark@gmail.com, sean@poorly.run, swboyd@chromium.org
Cc:     abhinavk@codeaurora.org, aravindh@codeaurora.org,
        khsieh@codeaurora.org, airlied@linux.ie, daniel@ffwll.ch,
        linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
        freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] drm/msm/dp: service only one irq_hpd if there are multiple irq_hpd pending
Date:   Fri, 16 Apr 2021 13:27:57 -0700
Message-Id: <1618604877-28297-1-git-send-email-khsieh@codeaurora.org>
Precedence: bulk

Some dongle may generate more than one irq_hpd events in a short period of
time. This patch will treat those irq_hpd events as single one and service
only one irq_hpd event.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 5a39da6..0a7d383 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -707,6 +707,9 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
 		return 0;
 	}
 
+	/* only handle first irq_hpd in case of multiple irs_hpd pending */
+	dp_del_event(dp, EV_IRQ_HPD_INT);
+
 	ret = dp_display_usbpd_attention_cb(&dp->pdev->dev);
 	if (ret == -ECONNRESET) { /* cable unplugged */
 		dp->core_initialized = false;
@@ -1300,6 +1303,9 @@ static int dp_pm_suspend(struct device *dev)
 	/* host_init will be called at pm_resume */
 	dp->core_initialized = false;
 
+	/* system suspended, delete pending irq_hdps */
+	dp_del_event(dp, EV_IRQ_HPD_INT);
+
 	mutex_unlock(&dp->event_mutex);
 
 	return 0;
@@ -1496,6 +1502,9 @@ int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder)
 	/* stop sentinel checking */
 	dp_del_event(dp_display, EV_DISCONNECT_PENDING_TIMEOUT);
 
+	/* link is down, delete pending irq_hdps */
+	dp_del_event(dp_display, EV_IRQ_HPD_INT);
+
 	dp_display_disable(dp_display, 0);
 
 	rc = dp_display_unprepare(dp);
-- 
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