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

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Message-Id: <20250110074458.3624094-1-christianshewitt@gmail.com>
Date: Fri, 10 Jan 2025 07:44:56 +0000
From: Christian Hewitt <christianshewitt@...il.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	dri-devel@...ts.freedesktop.org,
	linux-amlogic@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] drm/meson: vclk: revert and re-fix vclk calculations

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 provides a proper fix after I figured out the actual root cause
of the original problem. This time the maths checks out.

Apologies to the stable team as the original patch has been applied to
a wide range of older and LTS kernels (as far as 5.10). Please let me
know if combining the two patches into a single 'fix the previous fix'
patch would be preferred?

Christian

Christian Hewitt (2):
  Revert "drm/meson: vclk: fix calculation of 59.94 fractional rates"
  drm/meson: vclk: fix precision in vclk calculations

 drivers/gpu/drm/meson/meson_encoder_hdmi.c | 42 +++++++++++-----------
 drivers/gpu/drm/meson/meson_vclk.c         |  7 ++--
 2 files changed, 25 insertions(+), 24 deletions(-)

-- 
2.34.1