Use the pixel_size we got from drm_format_plane_cpp() instead of
fb->bits_per_pixel/8 when computing the primary plane page/linear
offsets. Avoids a few divs and makes the code more future proof
against funky pixel formats where bits_per_pixel isn't well defined.
This is what we already did in the sprite code.
Note that the relevant sprite patch was
commit
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| host1x | ||
| ipu-v3 | ||
| vga | ||
| Makefile | ||