6.6-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Wahren wahrenst@gmx.net
[ Upstream commit f1a54e860b1bc8d824925b5a77f510913880e8d6 ]
The commit 0f5251339eda ("drm/vc4: hdmi: Make sure the controller is powered in detect") introduced the necessary power management handling to avoid register access while controller is powered down. Unfortunately it just print a warning if pm_runtime_resume_and_get() fails and proceed anyway.
This could happen during suspend to idle. So we must assume it is unsafe to access the HDMI register. So bail out properly.
Fixes: 0f5251339eda ("drm/vc4: hdmi: Make sure the controller is powered in detect") Signed-off-by: Stefan Wahren wahrenst@gmx.net Reviewed-by: Maíra Canal mcanal@igalia.com Acked-by: Maxime Ripard mripard@kernel.org Signed-off-by: Maíra Canal mcanal@igalia.com Link: https://patchwork.freedesktop.org/patch/msgid/20240821214052.6800-3-wahrenst... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/vc4/vc4_hdmi.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 643754fa6a8ad..c6e986f71a26f 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -458,6 +458,7 @@ static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector, { struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector); enum drm_connector_status status = connector_status_disconnected; + int ret;
/* * NOTE: This function should really take vc4_hdmi->mutex, but @@ -470,7 +471,12 @@ static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector, * the lock for now. */
- WARN_ON(pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev)); + ret = pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev); + if (ret) { + drm_err_once(connector->dev, "Failed to retain HDMI power domain: %d\n", + ret); + return connector_status_unknown; + }
if (vc4_hdmi->hpd_gpio) { if (gpiod_get_value_cansleep(vc4_hdmi->hpd_gpio))