drm/vc4: Skip input lines when doing a large downscale#7387
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The TPZ filter wants ideally 3 lines of image to give good quality downscaling. More than that leads to excessive SDRAM bandwidth for no gain. If the downsample factor allows for it, reduce the programmed image height and increase the pitch to compensate. This currently does not handle T-format images where we need to configure it slightly differently. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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The TPZ filter wants ideally 3 lines of image to give good quality downscaling. More than that leads to excessive SDRAM bandwidth for no gain.
If the downsample factor allows for it, reduce the programmed image height and increase the pitch to compensate.
This currently does not handle T-format images where we need to configure it slightly differently.
@jc-kynesim : This should solve your 10bittest massive downscale issue.