The mp3309 has two configuration registers, named according to their address (0x00 and 0x01). In the second register (0x01), the bit DIMS (Dimming Mode Select) must be always 0 (zero), in both analog (via i2c commands) and pwm dimming mode. In the initial driver version, the DIMS bit was set in pwm mode and reset in analog mode. But if the DIMS bit is set in pwm dimming mode and other devices are connected on the same i2c bus, every i2c commands on the bus generates a flickering on the LEDs powered by the mp3309c. This change concerns the chip initialization and does not impact any existing device-tree configuration. I created this device driver for one of our boards, where both dimming modes (pwm and analog by i2c commands) can be used. This board uses the same i2c bus for the mp3309c and for an at24cs32 eeprom. During further tests, I realized that, when the mp3309c is used in pwm mode, every read operation on the eeprom caused a backlight flickering. This is why I made this device driver modification. Flavio Suligoi (1): backlight: mp3309c: fix leds flickering in pwm mode drivers/video/backlight/mp3309c.c | 5 ----- 1 file changed, 5 deletions(-) -- 2.34.1
