From c7dfbe26fd2baf373a439fa5edfe23da9a25c8b7 Mon Sep 17 00:00:00 2001 From: Martin Roth Date: Fri, 22 Jul 2016 11:15:12 -0600 Subject: google/oak: dsi: set mipi pin driving control on We set this driving control to prevent signal attenuation caused by LVDS DRV termination. When DA_LVDSTX_PWR_ON is not set, LVSH has no power and LVDS DRV termination status is unknown(floating). This creates a chance that MIPI output would be influenced. The DSI's LP signal will be half voltage attenuation. There will be no display on panel. When DA_LVDSTX_PWR_ON is set, LVSH and LVDS DRV termination are effective and termination is fixed OFF. The DSI won't be influenced. We only need to set this register once, so we set it here to prevent repeat setting in the kernel when the system goes to recovery mode. BUG=chrome-os-partner:55296 BRANCH=none TEST=build pass elm and show ui The original commit in the cros repo combined the chipset and mainboard code changes. This has been split for the push to coreboot.org Change-Id: I733bdd115950b71493856220414ac0dd75d28122 Signed-off-by: Martin Roth Original-Commit-Id: 0d25a27f300acc4b65a894110d3ee0cc9676cd12 Original-Change-Id: Ie71f9cc41924787be8539c576392034320b57a49 Original-Signed-off-by: Jitao Shi Original-Reviewed-on: https://chromium-review.googlesource.com/360850 Original-Commit-Ready: jitao shi Original-Tested-by: jitao shi Original-Reviewed-by: Julius Werner Reviewed-on: https://review.coreboot.org/15808 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh --- src/mainboard/google/oak/mainboard.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'src') diff --git a/src/mainboard/google/oak/mainboard.c b/src/mainboard/google/oak/mainboard.c index 1bf8d49872..e33d08c7a1 100644 --- a/src/mainboard/google/oak/mainboard.c +++ b/src/mainboard/google/oak/mainboard.c @@ -252,6 +252,10 @@ static void mainboard_init(device_t dev) gpio_input(PAD_EINT1); /* SD_DET */ configure_audio(); + + /* fix dsi lp mode is half voltage attenuation */ + mtk_dsi_pin_drv_ctrl(); + if (display_init_required()) { configure_backlight(); configure_display(); -- cgit v1.2.3