[PATCH 0/3] Add additional YUV420 bus format check for dw-meson's bridge enable

[Adrián Larumbe]

This is a belated follow-up on
https://lore.kernel.org/dri-devel/20220515204412.2733803-1-adrian.larumbe@collabora.com/

Commit e67f6037ae1be34b2b68 ("drm/meson: split out encoder from meson_dw_hdmi")
broke 4K display modes for me, and I discovered it was because the right pixel
clock wasn't being chosen in dw_hdmi_phy_init. I misinterpreted the reason as a
problem in figuring out whether we want to enforce YUV420 mode, but it turned
out to be a mismatch between what dw-meson code is doing and the way the bus
format is being picked by the dw-hdmi bus output format drm helper.

I fixed it by bringing back dw-hdmi bus format check in dw-meson.

The second patch makes sure YUV420 bus format is the only one being returned by
dw-hdmi's output format bridge function when that's the only drm mode allowed.

Adrián Larumbe (3):
  drm/meson: dw-hdmi: change YUV420 selection logic at clock setup
  dw-hdmi: truly enforce 420-only formats when drm mode demands it
  dw-hdmi: remove dead code and fix indentation

 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 35 +++++++++--------------
 drivers/gpu/drm/meson/meson_dw_hdmi.c     |  4 +--
 include/drm/bridge/dw_hdmi.h              |  2 ++
 3 files changed, 18 insertions(+), 23 deletions(-)

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2.40.0