linux-kernel - [PATCH 1/3] drm/panel: sitronix-st7789v: fix timing for jt240mhqs_hwt_ek

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Date: Tue, 09 Apr 2024 12:40:39 +0200
From: Gerald Loacker <gerald.loacker@...fvision.net>
To: Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Gerald Loacker <gerald.loacker@...fvision.net>
Subject: [PATCH 1/3] drm/panel: sitronix-st7789v: fix timing for
 jt240mhqs_hwt_ek_e3 panel

Flickering was observed when using partial mode. Moving the vsync to the
same position as used by the default sitronix-st7789v timing resolves this
issue.

Signed-off-by: Gerald Loacker <gerald.loacker@...fvision.net>
---
 drivers/gpu/drm/panel/panel-sitronix-st7789v.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
index 88e80fe98112..32e5c0348038 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
@@ -286,9 +286,9 @@ static const struct drm_display_mode jt240mhqs_hwt_ek_e3_mode = {
 	.hsync_end = 240 + 28 + 10,
 	.htotal = 240 + 28 + 10 + 10,
 	.vdisplay = 280,
-	.vsync_start = 280 + 8,
-	.vsync_end = 280 + 8 + 4,
-	.vtotal = 280 + 8 + 4 + 4,
+	.vsync_start = 280 + 48,
+	.vsync_end = 280 + 48 + 4,
+	.vtotal = 280 + 48 + 4 + 4,
 	.width_mm = 43,
 	.height_mm = 37,
 	.flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,

-- 
2.37.2