drm/vc4: hdmi: Switch to blank pixels when disabled

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In order to avoid pixels getting stuck in an unflushable FIFO, we need when
we disable the HDMI controller to switch away from getting our pixels from
the pixelvalve and instead use blank pixels, and switch back to the
pixelvalve when we enable the HDMI controller.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/fde3efb1ad79f4476a73d310cbba3ec07dc6dabe.1599120059.git-series.maxime@cerno.tech

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Maxime Ripard 2020-09-03 10:01:46 +02:00

parent 8b3f90e98e

commit 81d830137b

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9

drivers/gpu/drm/vc4/vc4_hdmi.c

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3

drivers/gpu/drm/vc4/vc4_regs.h

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