linux-kernel - [PATCH 0/3] arm64: allwinner: a64: fix video output on Pinebook

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Message-ID: <20241215053639.738890-1-anarsoul@gmail.com>
Date: Sat, 14 Dec 2024 21:34:56 -0800
From: Vasily Khoruzhick <anarsoul@...il.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Maxime Ripard <mripard@...nel.org>,
	Roman Beranek <me@...y.cz>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-clk@...r.kernel.org
Cc: Vasily Khoruzhick <anarsoul@...il.com>
Subject: [PATCH 0/3] arm64: allwinner: a64: fix video output on Pinebook

Since commit ca1170b69968 ("clk: sunxi-ng: a64: force select PLL_MIPI in TCON0 mux"),
TCON0 clock parent is always set to PLL_MIPI, but unfortunately it breaks
video output on Pinebook.

I did an experiment: I manually configured PLL_MIPI and PLL_VIDEO0_2X
to the same clock rate and flipped the switch with devmem. Experiment clearly
showed that whenever PLL_MIPI is selected as TCON0 clock parent, the video
output stops working.

To fix the issue, I partially reverted mentioned commit and added explicit
TCON0 clock parent assignment to device tree. By default, it will be
PLL_MIPI, and the only users with RGB output - Pinebook and Teres-I will
override it in their dts.

Vasily Khoruzhick (3):
  dt-bindings: clock: sunxi: Export PLL_VIDEO_2X and PLL_MIPI
  arm64: dts: allwinner: a64: explicitly assign clock parent for TCON0
  clk: sunxi-ng: a64: stop force-selecting PLL-MIPI as TCON0 parent

 arch/arm64/boot/dts/allwinner/sun50i-a64-pinebook.dts |  2 ++
 arch/arm64/boot/dts/allwinner/sun50i-a64-teres-i.dts  |  2 ++
 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi         |  2 ++
 drivers/clk/sunxi-ng/ccu-sun50i-a64.c                 | 11 -----------
 drivers/clk/sunxi-ng/ccu-sun50i-a64.h                 |  2 --
 include/dt-bindings/clock/sun50i-a64-ccu.h            |  2 ++
 6 files changed, 8 insertions(+), 13 deletions(-)

-- 
2.47.1