[PATCH 5.14 680/849] drm/bridge/lontium-lt9611uxc: fix provided connector suport

From: Dmitry Baryshkov dmitry.baryshkov@linaro.org

[ Upstream commit 15184965783aab3ca7ee4f939e2598943b3f40f9 ]

- set DRM_CONNECTOR_POLL_HPD as the connector will generate hotplug events on its own

- do not call drm_kms_helper_hotplug_event() unless mode_config.funcs pointer is not NULL to remove possible kernel oops.

Fixes: bc6fa8676ebb ("drm/bridge/lontium-lt9611uxc: move HPD notification out of IRQ handler") Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Robert Foss robert.foss@linaro.org Link: https://patchwork.freedesktop.org/patch/msgid/20210708230329.395976-1-dmitry... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c index 3cac16db970f0..010657ea7af78 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c @@ -167,9 +167,10 @@ static void lt9611uxc_hpd_work(struct work_struct *work) struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, work); bool connected;

- if (lt9611uxc->connector.dev) - drm_kms_helper_hotplug_event(lt9611uxc->connector.dev); - else { + if (lt9611uxc->connector.dev) { + if (lt9611uxc->connector.dev->mode_config.funcs) + drm_kms_helper_hotplug_event(lt9611uxc->connector.dev); + } else {

mutex_lock(&lt9611uxc->ocm_lock); connected = lt9611uxc->hdmi_connected; @@ -339,6 +340,8 @@ static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc return -ENODEV; }

+ lt9611uxc->connector.polled = DRM_CONNECTOR_POLL_HPD; + drm_connector_helper_add(&lt9611uxc->connector, &lt9611uxc_bridge_connector_helper_funcs); ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,