From: Maxime Ripard maxime@cerno.tech
[ Upstream commit e32e5723256a99c5324824503572f743377dd0fe ]
Prior to commit 6800234ceee0 ("drm/vc4: hdmi: Convert to gpiod"), in the detect hook, if we had an HPD GPIO we would only rely on it and return whatever state it was in.
However, that commit changed that by mistake to only consider the case where we have a GPIO and it returns a logical high, and would fall back to the other methods otherwise.
Since we can read the EDIDs when the HPD signal is low on some displays, we changed the detection status from disconnected to connected, and we would ignore an HPD pulse.
Fixes: 6800234ceee0 ("drm/vc4: hdmi: Convert to gpiod") Signed-off-by: Maxime Ripard maxime@cerno.tech Reviewed-by: Dave Stevenson dave.stevenson@raspberrypi.com Link: https://lore.kernel.org/r/20211025152903.1088803-3-maxime@cerno.tech Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/vc4/vc4_hdmi.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 1aeb57656112..e4533fe315bf 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -173,9 +173,9 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
WARN_ON(pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev));
- if (vc4_hdmi->hpd_gpio && - gpiod_get_value_cansleep(vc4_hdmi->hpd_gpio)) { - connected = true; + if (vc4_hdmi->hpd_gpio) { + if (gpiod_get_value_cansleep(vc4_hdmi->hpd_gpio)) + connected = true; } else if (drm_probe_ddc(vc4_hdmi->ddc)) { connected = true; } else if (HDMI_READ(HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED) {