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From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: dri-devel@lists.freedesktop.org,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Alejandro Hernandez <ajhernandez@ti.com>,
	Tomi Valkeinen <tomi.valkeinen@ti.com>,
	Jyri Sarha <jsarha@ti.com>
Subject: [PATCH 2/7] drm/omap: tweak HDMI DDC timings
Date: Mon, 2 Sep 2019 15:53:54 +0300	[thread overview]
Message-ID: <20190902125359.18001-3-tomi.valkeinen@ti.com> (raw)
In-Reply-To: <20190902125359.18001-1-tomi.valkeinen@ti.com>

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>
---
 drivers/gpu/drm/omapdrm/dss/hdmi5_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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 */
-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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  parent reply	other threads:[~2019-09-02 12:54 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-02 12:53 [PATCH 0/7] drm/omap: misc improvements Tomi Valkeinen
2019-09-02 12:53 ` [PATCH 1/7] drm/omap: drop unneeded locking from mgr_fld_write() Tomi Valkeinen
2019-09-03 14:14   ` Laurent Pinchart
2019-09-02 12:53 ` Tomi Valkeinen [this message]
2019-09-03 14:23   ` [PATCH 2/7] drm/omap: tweak HDMI DDC timings Laurent Pinchart
2019-09-26 12:54     ` Tomi Valkeinen
2019-09-26 14:40       ` Alejandro Hernandez
2019-09-02 12:53 ` [PATCH 3/7] drm/omap: fix missing scaler pixel fmt limitations Tomi Valkeinen
2019-09-03 15:12   ` Laurent Pinchart
2019-09-26 12:55     ` Tomi Valkeinen
2019-09-02 12:53 ` [PATCH 4/7] drm/omap: Implement CTM property for CRTC using OVL managers CPR matrix Tomi Valkeinen
2019-09-03 15:24   ` Laurent Pinchart
     [not found]     ` <b44372e2-1bb7-ddb8-d121-ae096b38d918@ti.com>
2019-09-04 11:11       ` Laurent Pinchart
2019-09-04 20:08         ` Jyri Sarha
2019-09-04 20:20           ` Ilia Mirkin
2020-09-21 11:08             ` Tomi Valkeinen
2020-09-21 11:49               ` Pekka Paalanen
2020-09-22  7:44                 ` Tomi Valkeinen
2020-09-22  9:48                   ` Pekka Paalanen
2020-09-22 10:02                   ` Daniel Stone
2019-09-04 21:52           ` Laurent Pinchart
2019-09-05 10:00             ` Jyri Sarha
2019-09-05 10:05               ` Laurent Pinchart
2019-09-05 13:48                 ` Jyri Sarha
2019-09-02 12:53 ` [PATCH 5/7] drm/omap: Enable COLOR_ENCODING and COLOR_RANGE properties for planes Tomi Valkeinen
2019-09-03 15:32   ` Laurent Pinchart
2019-09-05  9:24     ` Jyri Sarha
2019-09-05  9:43       ` Laurent Pinchart
2019-09-02 12:53 ` [PATCH 6/7] drm/omap: dss: platform_register_drivers() to dss.c and remove core.c Tomi Valkeinen
2019-09-03 15:34   ` Laurent Pinchart
2019-09-04  6:47     ` Jyri Sarha
2019-09-02 12:53 ` [PATCH 7/7] drm/omap: hdmi5: automatically choose limited/full range output Tomi Valkeinen
2019-09-03 15:38   ` Laurent Pinchart

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