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drm/bridge: lt8912b: Add hot plug detection

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[ Upstream commit 3b0a01a6a5 ]

Enable hot plug detection when it is available on the HDMI port.
Without this connecting to a different monitor with incompatible timing
before the 10 seconds poll period will lead to a broken display output.

Fixes: 30e2ae943c ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Adrien Grassein <adrien.grassein@gmail.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221128112320.25708-1-francesco@dolcini.it
Stable-dep-of: 941882a0e96d ("drm/bridge: lt8912b: Fix bridge_detach")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stefan Eichenberger
2022-11-28 12:23:20 +01:00
committed by Greg Kroah-Hartman
parent ef4a40953c
commit cc3057958c
1 changed files with 19 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/gpu/drm/bridge/lontium-lt8912b.c
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@@ -506,14 +506,27 @@ static int lt8912_attach_dsi(struct lt8912 *lt)
return 0;
}
static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status)
{
struct lt8912 *lt = data;
if (lt->bridge.dev)
drm_helper_hpd_irq_event(lt->bridge.dev);
}
static int lt8912_bridge_connector_init(struct drm_bridge *bridge)
{
int ret;
struct lt8912 *lt = bridge_to_lt8912(bridge);
struct drm_connector *connector = &lt->connector;
connector->polled = DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) {
drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt);
connector->polled = DRM_CONNECTOR_POLL_HPD;
} else {
connector->polled = DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
}
ret = drm_connector_init(bridge->dev, connector,
&lt8912_connector_funcs,
@@ -567,6 +580,10 @@ static void lt8912_bridge_detach(struct drm_bridge *bridge)
if (lt->is_attached) {
lt8912_hard_power_off(lt);
if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD)
drm_bridge_hpd_disable(lt->hdmi_port);
drm_connector_unregister(&lt->connector);
drm_connector_cleanup(&lt->connector);
}