[PATCH 5.7 002/124] drm/panel-simple: Fix inverted V/H SYNC for Frida FRD350H54004 panel

Greg Kroah-Hartman
2020-08-24T08:39:38Z

From: Paul Cercueil <paul@crapouillou.net>

[ Upstream commit bad20a2dbfdfaf01560026909506b6ed69d65ba2 ]

The FRD350H54004 panel was marked as having active-high VSYNC and HSYNC
signals, which sorts-of worked, but resulted in the picture fading out
under certain circumstances.

Fix this issue by marking VSYNC and HSYNC signals active-low.

v2: Rebase on drm-misc-next

Fixes: 7b6bd8433609 ("drm/panel: simple: Add support for the Frida FRD350H54004 panel")
Cc: stable@vger.kernel.org # v5.5
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716125647.10964-1-paul@crapouillou.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/panel/panel-simple.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 346e3f9fd505a..a68eff1fb4297 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -1537,7 +1537,7 @@ static const struct drm_display_mode frida_frd350h54004_mode = {
.vsync_end = 240 + 2 + 6,
.vtotal = 240 + 2 + 6 + 2,
.vrefresh = 60,
- .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
+ .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
};

static const struct panel_desc frida_frd350h54004 = {
--
2.25.1