drm/simple-kms-helper: Add mode_fixup() to simple display pipe

The mode fix-up function for simple display helpers is equivalent to the
regular pipeline's CRTC mode fix-up function. It's called to adjust the
CRTC's display mode for the encoder. Add this function for DRM fbconv
helpers.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2 files changed