linux-kernel - [PATCH 0/5] drm/panel: atna33xc20: Fix the Samsung ATNA45AF01 panel

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Message-Id: <20240710-x1e80100-crd-backlight-v1-0-eb242311a23e@linaro.org>
Date: Wed, 10 Jul 2024 19:04:56 +0200
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Jessica Zhang <quic_jesszhan@...cinc.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Douglas Anderson <dianders@...omium.org>, dri-devel@...ts.freedesktop.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, Abel Vesa <abel.vesa@...aro.org>, 
 Johan Hovold <johan@...nel.org>
Subject: [PATCH 0/5] drm/panel: atna33xc20: Fix the Samsung ATNA45AF01
 panel

The backlight of the Samsung ATNA45AF01 panel used in the Qualcomm X1E80100
CRD does not work correctly with the current display panel configuration
and drivers: It works after boot, but once the display gets disabled it is
not possible to get it back on. It turns out that the ATNA45AF01 panel
needs exactly the same non-standard power sequence as implemented for
ATNA33XC20 in the panel-samsung-atna33xc20 driver.

Move the ATNA45AF01 panel from the generic panel-edp driver to the
panel-samsung-atna33xc20 driver and fix the panel configuration in the
x1e80100-crd device tree to make the panel work correctly.

The DT changes are included here for reference and easier testing, I assume
Bjorn or Konrad will pick them up after the DRM panel changes were applied.

Signed-off-by: Stephan Gerhold <stephan.gerhold@...aro.org>
---
Stephan Gerhold (5):
      dt-bindings: display: panel: samsung,atna33xc20: Document ATNA45AF01
      drm/panel: samsung-atna33xc20: Add compatible for ATNA45AF01
      Revert "drm/panel-edp: Add SDC ATNA45AF01"
      arm64: dts: qcom: x1e80100-crd: Fix backlight
      arm64: defconfig: Add CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20

 .../bindings/display/panel/samsung,atna33xc20.yaml      |  6 +++++-
 arch/arm64/boot/dts/qcom/x1e80100-crd.dts               | 17 +++++++++++++++--
 arch/arm64/configs/defconfig                            |  1 +
 drivers/gpu/drm/panel/panel-edp.c                       |  2 --
 drivers/gpu/drm/panel/panel-samsung-atna33xc20.c        |  1 +
 5 files changed, 22 insertions(+), 5 deletions(-)
---
base-commit: 523b23f0bee3014a7a752c9bb9f5c54f0eddae88
change-id: 20240710-x1e80100-crd-backlight-632f9bf936ef

Best regards,
-- 
Stephan Gerhold <stephan.gerhold@...aro.org>