linux-kernel - [PATCH v2] arm64: dts: qcom: sc7280: Adjust zombie PWM frequency

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Message-Id: <20230213105803.v2.1.I610cef0ead2d5df1f7bd18bc0e0ae040b03725d0@changeid>
Date:   Mon, 13 Feb 2023 10:59:05 +0800
From:   Owen Yang <ecs.taipeikernel@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Abner Yen <abner.yen@....com.tw>, Harvey <hunge@...gle.com>,
        Matthias Kaehlcke <mka@...gle.com>,
        Doug Anderson <dianders@...omium.org>,
        Bob Moragues <moragues@...gle.com>,
        Gavin Lee <gavin.lee@....com.tw>,
        Owen Yang <ecs.taipeikernel@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH v2] arm64: dts: qcom: sc7280: Adjust zombie PWM frequency

Tune the PWM to solve screen flashing issue and high frequency noise.
While at it, the comment for the PWM settings incorrectly said we were using a 5kHz duty cycle. It should have said "period", not "duty cycle".
Correct this while updating the values.

Signed-off-by: Owen Yang <ecs.taipeikernel@...il.com>
---

Changes in v2:
-Correct unit and update values in comment.

 arch/arm64/boot/dts/qcom/sc7280-herobrine-zombie.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-zombie.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-zombie.dtsi
index 64deaaabac0f..a4fde22e3355 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-zombie.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-zombie.dtsi
@@ -61,8 +61,8 @@ ap_tp_i2c: &i2c0 {
 };
 
 &pm8350c_pwm_backlight {
-	/* Set the PWM period to 200 microseconds (5kHz duty cycle) */
-	pwms = <&pm8350c_pwm 3 200000>;
+	/* Set the PWM period to 320 microseconds (3.125kHz frequency) */
+	pwms = <&pm8350c_pwm 3 320000>;
 };
 
 &pwmleds {
-- 
2.17.1