linux-kernel - [PATCH v2] tps65910: Work around silicon erratum SWCZ010

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Date:	Fri, 22 Aug 2014 17:30:56 +0200
From:	"Arnout Vandecappelle (Essensium/Mind)" <arnout@...d.be>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Cc:	Laxman Dewangan <ldewangan@...dia.com>,
	David Brown <davidb@...eaurora.org>,
	"Arnout Vandecappelle (Essensium/Mind)" <arnout@...d.be>
Subject: [PATCH v2] tps65910: Work around silicon erratum SWCZ010

>From http://www.ti.com/lit/pdf/SWCZ010 :

Glitch on SDA-SCL not managed correctly by the I2C IP

Impact:
The standard specifies that the I2C transfer should restart on a start
event in all cases. The current design does not support two consecutive
Start conditions. This can cause the first real access after such a
glitch to be corrupted.

Description:
An unexpected glitch on SDA and SCL can generate a wrong start event.
In the current design, the SCL line must toggle two times to detect a
new start event and completely restart the I2C access; hence the real
start event is not detected in the case of a single SCL toggle.

Workaround:
Repeat I2C access.

A simpler workaround is to make a dummy transfer just before the first
access to the tps65910 chip. This can be done unconditionally.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@...d.be>
---
This patch is based on v3.17-rc1.
Build-tested with omap2plus_defconfig.
Runtime tested based on v3.4.97 with a custom config.

v2: use dummy transfer instead of retrying (Laxman Dewangan)
---
 drivers/mfd/tps65910.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index f243e75..7612d89 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -486,6 +486,11 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 	tps65910->i2c_client = i2c;
 	tps65910->id = chip_id;
 
+	/* Work around silicon erratum SWCZ010: the tps65910 may miss the
+	 * first I2C transfer. So issue a dummy transfer before the first
+	 * real transfer.
+	 */
+	i2c_master_send(i2c, "", 1);
 	tps65910->regmap = devm_regmap_init_i2c(i2c, &tps65910_regmap_config);
 	if (IS_ERR(tps65910->regmap)) {
 		ret = PTR_ERR(tps65910->regmap);
-- 
2.1.0

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