5.15-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Eichenberger stefan.eichenberger@toradex.com
[ Upstream commit 3b0a01a6a5224ed9b3f69f44edaa889b2e2b9779 ]
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: 30e2ae943c26 ("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-frances... Stable-dep-of: 941882a0e96d ("drm/bridge: lt8912b: Fix bridge_detach") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/bridge/lontium-lt8912b.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c index 6ad3b2d1819f1..a89e505aa3811 100644 --- a/drivers/gpu/drm/bridge/lontium-lt8912b.c +++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c @@ -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 = <->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, <8912_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(<->connector); drm_connector_cleanup(<->connector); }