[PATCH RFC v2 0/2] drm/meson: vclk: revert and re-fix vclk calculations

[Martin Blumenstingl]

This is a successor of a previous patchset by Christian [0]

Patch 1 reverts a previous fix for loss of HDMI sync when playing YUV420
@ 59.94 media. The patch does resolve a calculation issue. It also makes
all fractional rates invalid which is a bigger problem.

Patch 2 changes the whole drm/meson driver to use Hz as unit for clocks/
frequencies. And importantly it uses the relevant 64-bit maths helpers so
the code can still be compiled using for 32-bit ARM.
Maxime previously suggested using drm_hdmi_compute_mode_clock(). That's
still something to implement with future patches.

Neil, I'd like to hear your feedback on this approach.


[0] https://lore.kernel.org/linux-amlogic/20250110074458.3624094-1-christianshewitt@gmail.com/


Christian Hewitt (1):
  Revert "drm/meson: vclk: fix calculation of 59.94 fractional rates"

Martin Blumenstingl (1):
  drm/meson: use unsigned long long / Hz for frequency types

 drivers/gpu/drm/meson/meson_drv.c          |   2 +-
 drivers/gpu/drm/meson/meson_drv.h          |   2 +-
 drivers/gpu/drm/meson/meson_encoder_hdmi.c |  29 +--
 drivers/gpu/drm/meson/meson_vclk.c         | 195 +++++++++++----------
 drivers/gpu/drm/meson/meson_vclk.h         |  13 +-
 5 files changed, 126 insertions(+), 115 deletions(-)

-- 
2.49.0