drm/i915/tv: Bypass the vertical filter if possible
Let's switch the pipe into interlaced mode and switch off the TV encoder vertical filter if the pipe vdisplay matches the TV YSIZE exactly. While I didn't measure it I presume this might reduce the power consumption a little bit, and the pixel rate is halved as the pipe will now fetching in interlaced mode rather than in progressive mode (effectively the same difference as between IF-ID vs. PF-ID pfit modes on more modern hardware) so a bit easier on the memory bandwidth. Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190129141913.5515-2-ville.syrjala@linux.intel.comAcked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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