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drm/bridge: display-connector: don't set OP_DETECT for DisplayPorts

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Detecting the monitor for DisplayPort targets is more complicated than
just reading the HPD pin level: it requires reading the DPCD in order to
check what kind of device is attached to the port and whether there is
an actual display attached.

In order to let DRM framework handle such configurations, disable
DRM_BRIDGE_OP_DETECT for dp-connector devices, letting the actual DP
driver perform detection. This still keeps DRM_BRIDGE_OP_HPD enabled, so
it is valid for the bridge to report HPD events.

Currently inside the kernel there are only two targets which list
hpd-gpios for dp-connector devices: arm64/qcom/qcs6490-rb3gen2 and
arm64/qcom/sa8295p-adp. Both should be fine with this change.

Cc: Bjorn Andersson <andersson@kernel.org>
Cc: Konrad Dybcio <konradybcio@kernel.org>
Cc: linux-arm-msm@vger.kernel.org
Acked-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20250802-dp-conn-no-detect-v1-1-2748c2b946da@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Dmitry Baryshkov
2025-08-02 13:40:35 +03:00
parent 646dc268ec
commit cb640b2ca5
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/bridge/display-connector.c
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@@ -373,7 +373,8 @@ static int display_connector_probe(struct platform_device *pdev)
if (conn->bridge.ddc)
conn->bridge.ops |= DRM_BRIDGE_OP_EDID
| DRM_BRIDGE_OP_DETECT;
if (conn->hpd_gpio)
/* Detecting the monitor requires reading DPCD */
if (conn->hpd_gpio && type != DRM_MODE_CONNECTOR_DisplayPort)
conn->bridge.ops |= DRM_BRIDGE_OP_DETECT;
if (conn->hpd_irq >= 0)
conn->bridge.ops |= DRM_BRIDGE_OP_HPD;