[S] Change in coreboot[master]: soc/qualcomm/sc7280: update intf timing parameter calcualtion for eDP

[Venkat Thogaru (Code Review)]

Venkat Thogaru has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/72743 )

Change subject: soc/qualcomm/sc7280: update intf timing parameter calcualtion for eDP
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soc/qualcomm/sc7280: update intf timing parameter calcualtion for eDP

Correct the interface timing parameter calculation for eDP interface
to avoid writing into the blanking region.

BUG=b:255870643
TEST=Validated on sc7280 Zombie development board

Change-Id: I069ca351d8c60d071debb23a5e48840701441977
Signed-off-by: Vinod Polimera 
---
M src/soc/qualcomm/sc7280/display/disp.c
1 file changed, 24 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/43/72743/1

diff --git a/src/soc/qualcomm/sc7280/display/disp.c b/src/soc/qualcomm/sc7280/display/disp.c
index 28356f2..fd3ed3c 100644
--- a/src/soc/qualcomm/sc7280/display/disp.c
+++ b/src/soc/qualcomm/sc7280/display/disp.c
@@ -28,13 +28,15 @@

hsync_period = edid->mode.ha + edid->mode.hbl;
    vsync_period = edid->mode.va + edid->mode.vbl;
-	display_vstart = edid->mode.vbl * hsync_period + edid->mode.hbl;
-	display_vend = (vsync_period * hsync_period) - 1;
+	display_vstart = (edid->mode.vbl - edid->mode.vso) * hsync_period +
+			  edid->mode.hbl - edid->mode.hso;
+	display_vend = ((vsync_period - edid->mode.vso) * hsync_period) - edid->mode.hso - 1;
    hsync_ctl = (hsync_period << 16) | edid->mode.hspw;
-	display_hctl = edid->mode.hbl | (hsync_period - 1) << 16;
-	active_vstart = edid->mode.vbl * hsync_period;
-	active_vend = display_vend;
-	active_hctl = display_hctl;
+	active_vstart = display_vstart;
+	active_vend = active_vstart + (edid->mode.va * hsync_period) - 1;
+	active_hctl = ((edid->mode.hbl - edid->mode.hso + edid->mode.ha - 1) << 16) |
+		       (edid->mode.hbl - edid->mode.hso);
+	display_hctl = active_hctl;

write32(&mdp_intf->intf_active_v_start_f0, active_vstart);
    write32(&mdp_intf->intf_active_v_end_f0, active_vend);