From 321130438ef3ce681cdd1911bf72de66e1b7ff23 Mon Sep 17 00:00:00 2001 From: Wonjoon Lee Date: Tue, 12 Jul 2016 20:10:36 +0900 Subject: [PATCH] kevin: change pwm frequency to reduce EE noise Currently we have EEnoise(Decap Switching Noise) from LCD PWM Kevin use LCD Backlight Driver IC and PWM Frequency from EC Current 10kHz frequency can make switching Noise easily. BUG=chrome-os-partner:55169 BRANCH=None TEST=measuring noise reduced, verifying there was no influence to LCD/digitizer/tsp Change-Id: I1e65e56a19177dadba0110de5678669288a8555a Signed-off-by: Wonjoon Lee Reviewed-on: https://chromium-review.googlesource.com/360003 Reviewed-by: Shawn N --- board/kevin/board.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/board/kevin/board.c b/board/kevin/board.c index 3baffacf69..dac0fb61b4 100644 --- a/board/kevin/board.c +++ b/board/kevin/board.c @@ -90,7 +90,7 @@ const struct pwm_t pwm_channels[] = { #ifdef BOARD_KEVIN [PWM_CH_LED_GREEN] = { 0, PWM_CONFIG_DSLEEP, 100 }, #endif - [PWM_CH_DISPLIGHT] = { 2, 0, 10000 }, + [PWM_CH_DISPLIGHT] = { 2, 0, 210 }, [PWM_CH_LED_RED] = { 3, PWM_CONFIG_DSLEEP, 100 }, #ifdef BOARD_KEVIN [PWM_CH_LED_BLUE] = { 4, PWM_CONFIG_DSLEEP, 100 },