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[PATCHv2,3/7] drm/omap: tweak HDMI DDC timings

Message ID 20190930103840.18970-4-tomi.valkeinen@ti.com (mailing list archive)
State New, archived
Headers show
Series drm/omap: misc improvements | expand

Commit Message

Tomi Valkeinen Sept. 30, 2019, 10:38 a.m. UTC 
From: Alejandro Hernandez <ajhernandez@ti.com>

A "HDMI I2C Master Error" is sometimes reported with the current DDC SCL
timings. The current settings for a 10us SCL period (100 KHz) causes the
error with some displays.  This patch increases the SCL signal period
from 10us to 10.2us, with the new settings the error is not observed

Signed-off-by: Alejandro Hernandez <ajhernandez@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/gpu/drm/omapdrm/dss/hdmi5_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c b/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c
index 7400fb99d453..4c588ec7634a 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c
@@ -39,8 +39,8 @@  static void hdmi_core_ddc_init(struct hdmi_core_data *core)
 {
 	void __iomem *base = core->base;
 	const unsigned long long iclk = 266000000;	/* DSS L3 ICLK */
-	const unsigned int ss_scl_high = 4600;		/* ns */
-	const unsigned int ss_scl_low = 5400;		/* ns */
+	const unsigned int ss_scl_high = 4700;		/* ns */
+	const unsigned int ss_scl_low = 5500;		/* ns */
 	const unsigned int fs_scl_high = 600;		/* ns */
 	const unsigned int fs_scl_low = 1300;		/* ns */
 	const unsigned int sda_hold = 1000;		/* ns */