drm/vc4: hdmi: Make sure the controller is powered in detect

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[ Upstream commit 9984d6664c ]

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: 4f6e3d66ac ("drm/vc4: Add runtime PM support to the HDMI encoder driver")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210525091059.234116-4-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Maxime Ripard 2021-05-25 11:10:59 +02:00 • committed by Sasha Levin

parent f73aca83fd

commit cf59354875

1 changed files with 4 additions and 0 deletions

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drivers/gpu/drm/vc4/vc4_hdmi.c

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