[XS] Change in coreboot[main]: mb/google/geralt: Remove unnecessary delay for MIPI panel

[Yu-Ping Wu (Code Review)]

Yu-Ping Wu has submitted this change. ( https://review.coreboot.org/c/coreboot/+/79109?usp=email )

Change subject: mb/google/geralt: Remove unnecessary delay for MIPI panel
......................................................................

mb/google/geralt: Remove unnecessary delay for MIPI panel

According to eDP panel datasheet[1], the eDP panel needs 0 <= x <=200ms
delay after VDD powering on. The MIPI panel[2] does not need this delay.
Move this delay to eDP path.

[1] NE135FBM-N41 V8.0 Product Spec_P2 20191025.pdf
[2] B5 TV110C9M-LL0 Product Specification Rev.P0

BRANCH=none
BUG=none
TEST=check FW screen
TEST=check timestamp
Before:
  60:device initialization                             696,422 (1)
  15:starting LZMA decompress (ignore for x86)         696,587 (165)
  16:finished LZMA decompress (ignore for x86)         696,675 (88)
  17:starting LZ4 decompress (ignore for x86)          1,340,226 (643,551)

After:
  60:device initialization                             724,259 (1)
  15:starting LZMA decompress (ignore for x86)         724,425 (166)
  16:finished LZMA decompress (ignore for x86)         724,512 (87)
  17:starting LZ4 decompress (ignore for x86)          1,168,176 (443,664)

Change-Id: I92bca5ec8269f4bad4dfab4ee193cdb5665de233
Signed-off-by: Yidi Lin 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79109
Reviewed-by: Ruihai Zhou 
Tested-by: build bot (Jenkins) 
Reviewed-by: Yu-Ping Wu 
Reviewed-by: Eric Lai 
Reviewed-by: Paul Menzel 
---
M src/mainboard/google/geralt/display.c
1 file changed, 1 insertion(+), 1 deletion(-)

Approvals:
  Paul Menzel: Looks good to me, but someone else must approve
  build bot (Jenkins): Verified
  Ruihai Zhou: Looks good to me, but someone else must approve
  Yu-Ping Wu: Looks good to me, approved
  Eric Lai: Looks good to me, approved

diff --git a/src/mainboard/google/geralt/display.c b/src/mainboard/google/geralt/display.c
index fa007a1..68a0a22 100644
--- a/src/mainboard/google/geralt/display.c
+++ b/src/mainboard/google/geralt/display.c
@@ -33,9 +33,9 @@
    panel->power_on();

mtk_ddp_init();
-	mdelay(200);

if (panel->disp_path == DISP_PATH_EDP) {
+		mdelay(200);
    	if (mtk_edp_init(&edid) < 0) {
    		printk(BIOS_ERR, "%s: Failed to initialize eDP\n", __func__);
    		return -1;