[PATCH 5.10 305/599] drm/msm/dp: populate connector of struct dp_panel

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 19:03:00 EST

From: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>

[ Upstream commit 5e602f5156910c7b19661699896cb6e3fb94fab9 ]

DP CTS test case has valid edid with bad checksum on purpose
and expect DP source return correct checksum. During drm edid read,
correct edid checksum is calculated and stored at

The problem is struct dp_panel::connector never be assigned, instead the
connector is stored in struct msm_dp::connector. When we run compliance
testing test case dp_panel_handle_sink_request() won't have a valid
edid set in struct dp_panel::edid so we'll try to use the connectors
real_edid_checksum and hit a NULL pointer dereference error because the
connector pointer is never assigned.

Changes in V2:
-- populate panel connector at msm_dp_modeset_init() instead of at dp_panel_read_sink_caps()

Changes in V3:
-- remove unhelpful kernel crash trace commit text
-- remove renaming dp_display parameter to dp

Changes in V4:
-- add more details to commit text

Changes in v10:
-- group into one series

Changes in v11:
-- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read

Fixes: 7948fe12d47 ("drm/msm/dp: return correct edid checksum after corrupted edid checksum read")
Signee-off-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>

Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1642531648-8448-3-git-send-email-quic_khsieh@xxxxxxxxxxx
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/gpu/drm/msm/dp/dp_display.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 66f2ea3d42fc..6cd6934c8c9f 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1336,6 +1336,7 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
struct drm_encoder *encoder)
struct msm_drm_private *priv;
+ struct dp_display_private *dp_priv;
int ret;

if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev))
@@ -1344,6 +1345,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
priv = dev->dev_private;
dp_display->drm_dev = dev;

+ dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
ret = dp_display_request_irq(dp_display);
if (ret) {
DRM_ERROR("request_irq failed, ret=%d\n", ret);
@@ -1361,6 +1364,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
return ret;

+ dp_priv->panel->connector = dp_display->connector;
priv->connectors[priv->num_connectors++] = dp_display->connector;
return 0;