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lontium-lt9611: check a different register bit for HDMI sensing

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It has been observed that with certain monitors such as the HP Z27n,
the register 0x825e reads a value of 0x79 when the HDMI cable is
connected and 0x78 when it is disconnected, i.e. bit 0 appears
to correspond to the HDMI connection status and bit 2 is never
set. Therefore, change the driver to check bit 0 instead of bit 2.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Link: https://linux-review.googlesource.com/id/I7e76411127e1ce4988a3f6d0c8ba5f1c3d880c23
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211117020724.2647769-1-pcc@google.com
This commit is contained in:
Peter Collingbourne 2021-11-16 18:07:24 -08:00 committed by Robert Foss
parent 09717af7d1
commit 19cf41b64e
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GPG key ID: 3EFD900F76D1D784
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/bridge/lontium-lt9611.c
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@ -586,7 +586,7 @@ lt9611_connector_detect(struct drm_connector *connector, bool force)
int connected = 0;
regmap_read(lt9611->regmap, 0x825e, &reg_val);
connected = (reg_val & BIT(2));
connected = (reg_val & BIT(0));
lt9611->status = connected ? connector_status_connected :
connector_status_disconnected;
@ -892,7 +892,7 @@ static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
int connected;
regmap_read(lt9611->regmap, 0x825e, &reg_val);
connected = reg_val & BIT(2);
connected = reg_val & BIT(0);
lt9611->status = connected ? connector_status_connected :
connector_status_disconnected;