[coreboot-gerrit] New patch to review for coreboot: google/oak: dsi: set mipi pin driving control on

[Martin Roth (martinroth@google.com)]

Martin Roth (martinroth at google.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15808

-gerrit

commit 7ee4d80f47edf357cb291a4cc4fa17bb1239aac6
Author: Martin Roth <martinroth at chromium.org>
Date:   Fri Jul 22 11:15:12 2016 -0600

    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 <martinroth at chromium.org>
    Original-Commit-Id: 0d25a27f300acc4b65a894110d3ee0cc9676cd12
    Original-Change-Id: Ie71f9cc41924787be8539c576392034320b57a49
    Original-Signed-off-by: Jitao Shi <jitao.shi at mediatek.com>
    Original-Reviewed-on: https://chromium-review.googlesource.com/360850
    Original-Commit-Ready: jitao shi <jitao.shi at mediatek.com>
    Original-Tested-by: jitao shi <jitao.shi at mediatek.com>
    Original-Reviewed-by: Julius Werner <jwerner at chromium.org>
---
 src/mainboard/google/oak/mainboard.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mainboard/google/oak/mainboard.c b/src/mainboard/google/oak/mainboard.c
index 1bf8d49..e33d08c 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();