linux-kernel - [PATCH] drm/panel: otm8009a: set clock to 29.70 Mhz

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Message-ID: <1553155646-13636-1-git-send-email-yannick.fertre@st.com>
Date:   Thu, 21 Mar 2019 09:07:26 +0100
From:   Yannick Fertré <yannick.fertre@...com>
To:     Yannick Fertre <yannick.fertre@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Thierry Reding <thierry.reding@...il.com>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: [PATCH] drm/panel: otm8009a: set clock to 29.70 Mhz

The panel does not support clock frequency over 30.74 Mhz.
The clock rate has been reduced to 29.70 Mhz & new timings have
been computed to get a framerate of 50fps.

Signed-off-by: Yannick Fertré <yannick.fertre@...com>
---
 drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
index 87fa316..f715bbe 100644
--- a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
+++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
@@ -67,15 +67,15 @@ struct otm8009a {
 };
 
 static const struct drm_display_mode default_mode = {
-	.clock = 32729,
+	.clock = 29700,
 	.hdisplay = 480,
-	.hsync_start = 480 + 120,
-	.hsync_end = 480 + 120 + 63,
-	.htotal = 480 + 120 + 63 + 120,
+	.hsync_start = 480 + 98,
+	.hsync_end = 480 + 98 + 32,
+	.htotal = 480 + 98 + 32 + 98,
 	.vdisplay = 800,
-	.vsync_start = 800 + 12,
-	.vsync_end = 800 + 12 + 12,
-	.vtotal = 800 + 12 + 12 + 12,
+	.vsync_start = 800 + 15,
+	.vsync_end = 800 + 15 + 10,
+	.vtotal = 800 + 15 + 10 + 14,
 	.vrefresh = 50,
 	.flags = 0,
 	.width_mm = 52,
-- 
2.7.4