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media: TDA1997x: report -ENOLINK after disconnecting HDMI source
The TD1997x chip retains vper, hper and hsper register values when the HDMI source is disconnected. Use a different means of checking if the link is still valid. Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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