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| author | Mario Scheithauer <mario.scheithauer@siemens.com> | 2018-09-27 11:51:23 +0200 |
|---|---|---|
| committer | Werner Zeh <werner.zeh@siemens.com> | 2018-10-01 04:14:41 +0000 |
| commit | 1e67f0773bff13b6ced9e9cf101917538f49c48b (patch) | |
| tree | 803f2d450d3ac81af736d042e99fc3aeb05f2429 /src/mainboard | |
| parent | 15d840558480536ddaca71bc1876254d59fca7fe (diff) | |
| download | coreboot-1e67f0773bff13b6ced9e9cf101917538f49c48b.tar.xz | |
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 <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/28761
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/siemens/mc_apl1/variants/mc_apl1/ptn3460.c | 4 |
1 files changed, 2 insertions, 2 deletions
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. */ |