linux-kernel - [PATCH 0/4] Various fixes for the lm3630a backlight driver

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Date: Tue, 20 Feb 2024 00:11:18 +0100
From: Luca Weiss <luca@...tu.xyz>
To: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 Lee Jones <lee@...nel.org>, Daniel Thompson <daniel.thompson@...aro.org>, 
 Jingoo Han <jingoohan1@...il.com>, Helge Deller <deller@....de>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 "G.Shark Jeong" <gshark.jeong@...il.com>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Maximilian Weigand <mweigand@...igand.net>
Cc: dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 devicetree@...r.kernel.org, Luca Weiss <luca@...tu.xyz>
Subject: [PATCH 0/4] Various fixes for the lm3630a backlight driver

On the MSM8974 Nexus 5 and OnePlus One phones (latter doesn't have
display upstream) the display backlight was turning off whenever you
would write a brightness to sysfs since a recent commit to the driver
(kernel v6.5).

  backlight: lm3630a: Turn off both led strings when display is blank 

Turns out, backlight_is_blank() thought the display was blanked because
the props variable is was checking was never actually initialized so it
was just reading some value that was left before.

The first commit in this series fixes this, and the others are some
cleanups / fixes I noticed while working on this.

As last commit, we can finally hook up the panel and backlight on the
Nexus 5 so blanking the screen actually turns off the backlight.

Signed-off-by: Luca Weiss <luca@...tu.xyz>
---
Luca Weiss (4):
      backlight: lm3630a: Initialize backlight_properties on init
      backlight: lm3630a: Don't set bl->props.brightness in get_brightness
      backlight: lm3630a: Use backlight_get_brightness helper in update_status
      ARM: dts: qcom: msm8974-hammerhead: Hook up backlight

 .../qcom/qcom-msm8974-lge-nexus5-hammerhead.dts    |  4 ++-
 drivers/video/backlight/lm3630a_bl.c               | 29 ++++++++++------------
 2 files changed, 16 insertions(+), 17 deletions(-)
---
base-commit: b401b621758e46812da61fa58a67c3fd8d91de0d
change-id: 20240219-lm3630a-fixups-8a9359e5a8ce

Best regards,
-- 
Luca Weiss <luca@...tu.xyz>