From: Maxime Ripard <maxime@cerno.tech>
To: dri-devel@lists.freedesktop.org,
Daniel Vetter <daniel.vetter@intel.com>,
David Airlie <airlied@linux.ie>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Maxime Ripard <maxime@cerno.tech>
Cc: Daniel Vetter <daniel@ffwll.ch>,
Boris Brezillon <bbrezillon@kernel.org>,
linux-kernel@vger.kernel.org, Eric Anholt <eric@anholt.net>,
Emma Anholt <emma@anholt.net>,
Dave Stevenson <dave.stevenson@raspberrypi.com>,
Phil Elwell <phil@raspberrypi.com>,
Tim Gover <tim.gover@raspberrypi.com>,
Dom Cobley <dom@raspberrypi.com>,
Maxime Ripard <mripard@kernel.org>
Subject: [PATCH 3/3] drm/vc4: hdmi: Make sure the controller is powered in detect
Date: Tue, 25 May 2021 11:10:59 +0200 [thread overview]
Message-ID: <20210525091059.234116-4-maxime@cerno.tech> (raw)
In-Reply-To: <20210525091059.234116-1-maxime@cerno.tech>
If the HPD GPIO is not available and drm_probe_ddc fails, we end up
reading the HDMI_HOTPLUG register, but the controller might be powered
off resulting in a CPU hang. Make sure we have the power domain and the
HSM clock powered during the detect cycle to prevent the hang from
happening.
Fixes: 4f6e3d66ac52 ("drm/vc4: Add runtime PM support to the HDMI encoder driver")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 867009a471e1..4b6857467e58 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -166,6 +166,8 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
bool connected = false;
+ WARN_ON(pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev));
+
if (vc4_hdmi->hpd_gpio) {
if (gpio_get_value_cansleep(vc4_hdmi->hpd_gpio) ^
vc4_hdmi->hpd_active_low)
@@ -187,10 +189,12 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
}
}
+ pm_runtime_put(&vc4_hdmi->pdev->dev);
return connector_status_connected;
}
cec_phys_addr_invalidate(vc4_hdmi->cec_adap);
+ pm_runtime_put(&vc4_hdmi->pdev->dev);
return connector_status_disconnected;
}
--
2.31.1
next prev parent reply other threads:[~2021-05-25 9:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 9:10 [PATCH 0/3] drm/vc4: Fix for the HDMI detect power state Maxime Ripard
2021-05-25 9:10 ` [PATCH 1/3] drm: Mention the power state requirement on side-channel operations Maxime Ripard
2021-05-25 9:10 ` [PATCH 2/3] drm/vc4: hdmi: Move the HSM clock enable to runtime_pm Maxime Ripard
2021-06-16 10:49 ` Dave Stevenson
2021-05-25 9:10 ` Maxime Ripard [this message]
2021-06-16 10:51 ` [PATCH 3/3] drm/vc4: hdmi: Make sure the controller is powered in detect Dave Stevenson
2021-06-16 12:35 ` Maxime Ripard
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