[media] gscpa - sn9c20x: Add sd_isoc_init ensuring enough bw when i420 fmt
When using the SN9C20X_I420 fmt the sn9c20x needs more bandwidth than our regular bandwidth calculations reserve. This patch adds a sd_isoc_init function, which forces the use of a specific altsetting when using the SN9C20X_I420 fmt. This fixes the bottom 10-30% of the image getting corrupted when using the SN9C20X_I420 fmt (which is the default fmt). Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jean-François Moine <moinejf@free.fr> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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