linux-kernel - [PATCH 2/2] drm/panel: NT39016: Add support for 50 Hz refresh rate

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Message-Id: <20200408095830.8131-2-paul@crapouillou.net>
Date:   Wed,  8 Apr 2020 11:58:30 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     od@...c.me, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 2/2] drm/panel: NT39016: Add support for 50 Hz refresh rate

By changing the pixel clock and the length of the back porch, it is
possible to obtain a perfect 50 Hz refresh rate.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/gpu/drm/panel/panel-novatek-nt39016.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt39016.c b/drivers/gpu/drm/panel/panel-novatek-nt39016.c
index f1286cf6528b..05cae8d62d56 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt39016.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt39016.c
@@ -325,7 +325,7 @@ static int nt39016_remove(struct spi_device *spi)
 }
 
 static const struct drm_display_mode kd035g6_display_modes[] = {
-	{
+	{	/* 60 Hz */
 		.clock = 6000,
 		.hdisplay = 320,
 		.hsync_start = 320 + 10,
@@ -338,6 +338,19 @@ static const struct drm_display_mode kd035g6_display_modes[] = {
 		.vrefresh = 60,
 		.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
 	},
+	{	/* 50 Hz */
+		.clock = 5400,
+		.hdisplay = 320,
+		.hsync_start = 320 + 42,
+		.hsync_end = 320 + 42 + 50,
+		.htotal = 320 + 42 + 50 + 20,
+		.vdisplay = 240,
+		.vsync_start = 240 + 5,
+		.vsync_end = 240 + 5 + 1,
+		.vtotal = 240 + 5 + 1 + 4,
+		.vrefresh = 50,
+		.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+	},
 };
 
 static const struct nt39016_panel_info kd035g6_info = {
-- 
2.25.1