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From: Kuogee Hsieh <khsieh@codeaurora.org>
To: robdclark@gmail.com, sean@poorly.run, swboyd@chromium.org
Cc: Kuogee Hsieh <khsieh@codeaurora.org>,
	abhinavk@codeaurora.org, aravindh@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 v4 5/6] drm/msm/dp: return correct edid checksum after corrupted edid checksum read
Date: Wed, 11 Aug 2021 09:30:06 -0700	[thread overview]
Message-ID: <1628699407-28358-6-git-send-email-khsieh@codeaurora.org> (raw)
In-Reply-To: <1628699407-28358-1-git-send-email-khsieh@codeaurora.org>

Response with correct edid checksum saved at connector after corrupted edid
checksum read. This fixes Link Layer CTS cases 4.2.2.3, 4.2.2.6.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/gpu/drm/msm/dp/dp_panel.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 88196f7..0fdb551 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -271,7 +271,7 @@ static u8 dp_panel_get_edid_checksum(struct edid *edid)
 {
 	struct edid *last_block;
 	u8 *raw_edid;
-	bool is_edid_corrupt;
+	bool is_edid_corrupt = false;
 
 	if (!edid) {
 		DRM_ERROR("invalid edid input\n");
@@ -303,7 +303,12 @@ void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
 	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 
 	if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
-		u8 checksum = dp_panel_get_edid_checksum(dp_panel->edid);
+		u8 checksum;
+
+		if (dp_panel->edid)
+			checksum = dp_panel_get_edid_checksum(dp_panel->edid);
+		else
+			checksum = dp_panel->connector->real_edid_checksum;
 
 		dp_link_send_edid_checksum(panel->link, checksum);
 		dp_link_send_test_response(panel->link);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


  parent reply	other threads:[~2021-08-11 16:35 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 16:30 [PATCH v4 0/6] add fixes to pass DP Link Layer compliance test cases Kuogee Hsieh
2021-08-11 16:30 ` [PATCH v4 1/6] drm/msm/dp: use dp_ctrl_off_link_stream during PHY compliance test run Kuogee Hsieh
2021-08-11 16:30 ` [PATCH v4 2/6] drm/msm/dp: reduce link rate if failed at link training 1 Kuogee Hsieh
2021-08-11 16:30 ` [PATCH v4 3/6] drm/msm/dp: reset aux controller after dp_aux_cmd_fifo_tx() failed Kuogee Hsieh
2021-08-11 16:30 ` [PATCH v4 4/6] drm/msm/dp: replug event is converted into an unplug followed by an plug events Kuogee Hsieh
2021-08-11 16:30 ` Kuogee Hsieh [this message]
2021-08-11 16:30 ` [PATCH v4 6/6] drm/msm/dp: do not end dp link training until video is ready Kuogee Hsieh
2021-11-25 11:39 ` [PATCH v4 0/6] add fixes to pass DP Link Layer compliance test cases Dmitry Baryshkov

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