linux-kernel - [PATCH v2 0/6] Two fixes of RK3036 HDMI

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Message-ID: <20250325132944.171111-1-andyshrk@163.com>
Date: Tue, 25 Mar 2025 21:29:34 +0800
From: Andy Yan <andyshrk@....com>
To: heiko@...ech.de
Cc: conor+dt@...nel.org,
	krzk+dt@...nel.org,
	robh@...nel.org,
	hjc@...k-chips.com,
	devicetree@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	Andy Yan <andy.yan@...k-chips.com>
Subject: [PATCH v2 0/6] Two fixes of RK3036 HDMI

From: Andy Yan <andy.yan@...k-chips.com>

When preparing to convert the current inno hdmi driver into a bridge driver,
I found that there are several issues currently existing with it:

1. When the system starts up, the first time it reads the EDID, it will
   fail.
   This is because RK3036 HDMI DDC bus requires it's PHY's reference clock
   to be enabled first before normal DDC communication can be carried out.

2. The signal is unstable. When running the glmark2 test on the screen,
   there is a small probability of seeing some screen flickering.
   This is because The HSYNC/VSYNC polarity of rk3036 HDMI are controlled
   by GRF. This part is missing in the current driver.

This series first try to Fix Document in the dt-binding, then add the
missing part in driver and dts.

Changes in v2:
- Included the HSYNC/VSYNC polarity fix

Andy Yan (6):
  dt-bindings: display: rockchip,inno-hdmi: Fix Document of RK3036
    compatible
  dt-bindings: display: rockchip,inno-hdmi: Document GRF for RK3036 HDMI
  drm/rockchip: inno-hdmi: Simplify error handler with dev_err_probe
  drm/rockchip: inno-hdmi: Fix video timing HSYNC/VSYNC polarity setting
    for rk3036
  ARM: dts: rockchip: Add ref clk for hdmi
  Revert "ARM: dts: rockchip: drop grf reference from rk3036 hdmi"

 .../display/rockchip/rockchip,inno-hdmi.yaml  | 20 ++++---
 arch/arm/boot/dts/rockchip/rk3036.dtsi        |  5 +-
 drivers/gpu/drm/rockchip/inno_hdmi.c          | 55 ++++++++++++++-----
 3 files changed, 55 insertions(+), 25 deletions(-)

-- 
2.43.0