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

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@gmail.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