From 1e67f0773bff13b6ced9e9cf101917538f49c48b Mon Sep 17 00:00:00 2001 From: Mario Scheithauer Date: Thu, 27 Sep 2018 11:51:23 +0200 Subject: siemens/mc_apl1: Activate clock spreading for PTN3460 In order to minimize Electromagnetic Interference (EMI) on the LVDS interface driven by PTN3460, clock spreading must be activated for mc_apl1 mainboard. The modulation ratio is set to 1 % of the nominal frequency. Change-Id: Ie457fcdbb6239dc0b25e2c35ad7a310ee80383f9 Signed-off-by: Mario Scheithauer Reviewed-on: https://review.coreboot.org/28761 Reviewed-by: Werner Zeh Tested-by: build bot (Jenkins) --- src/mainboard/siemens/mc_apl1/variants/mc_apl1/ptn3460.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'src/mainboard/siemens') diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl1/ptn3460.c b/src/mainboard/siemens/mc_apl1/variants/mc_apl1/ptn3460.c index f1cbf0f0ee..829af2a25b 100644 --- a/src/mainboard/siemens/mc_apl1/variants/mc_apl1/ptn3460.c +++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl1/ptn3460.c @@ -84,8 +84,8 @@ int ptn3460_init(const char *hwi_block) /* Use 18 bits per pixel. */ cfg.lvds_interface_ctrl1 |= 0x20; - /* No clock spreading, 300 mV LVDS swing. */ - cfg.lvds_interface_ctrl2 = 0x03; + /* 1 % clock spreading, 300 mV LVDS swing. */ + cfg.lvds_interface_ctrl2 = 0x13; /* No LVDS signal swap. */ cfg.lvds_interface_ctrl3 = 0x00; /* Delay T2 (VDD to LVDS active) by 16 ms. */ -- cgit v1.2.3