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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-sunxi@googlegroups.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi all, I am working on adding an old A10 device to mainline and noticed an issue when testing on 5.5.8 vs master. Since 5.6-rc1, I can't control the brightness of my LCD backlight anymore. The backlight stays on full brightness instead. I am controlling the brightness value via sysfs for testing. I am not sure if this is a general pwm-sun4i issue or if it is related to the backlight. However I narrowed it down to one commit for pwm-sun4i: fa4d81784681a26bcf7d2a43c6ac5cf991ef28f5 If I use pwm-sun4i.c from 5b090b430d750961305030232314b6acdb0102aa on master, the backlight works fine. Unfortunately, due to my lack of kernel experience, I can't see how the commit above broke it. Not sure if it helps, but the binding for the backlight is as follows: backlight: backlight { compatible = "pwm-backlight"; pwms = <&pwm 0 100000 PWM_POLARITY_INVERTED>; power-supply = <®_vbat>; enable-gpios = <&pio 7 7 GPIO_ACTIVE_HIGH>; /* PH7 */ brightness-levels = <0 30 40 50 60 70 80 90 100>; default-brightness-level = <8>; }; Please let me know if there is anything else which might be helpful to know or anything I can test. Regards, Pascal _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel