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From 23fa8d125ca1be9c03ac7d2f42530a57d6ca28f2 Mon Sep 17 00:00:00 2001
From: Valentine Barshak <valentine.barshak@cogentembedded.com>
Date: Tue, 3 Mar 2015 18:30:16 +0300
Subject: [PATCH] i2c: busses: rcar: Workaround arbitration loss error
Sometimes I2C master enable/disable at every transmission
causes arbitration loss errors making the bus unusable.
Workaround the issue by enabling I2C master
in the rcar_i2c_init() function.
Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
---
drivers/i2c/busses/i2c-rcar.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 0e863f3..4334006 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -161,7 +161,7 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv)
/* reset master mode */
rcar_i2c_write(priv, ICMIER, 0);
- rcar_i2c_write(priv, ICMCR, 0);
+ rcar_i2c_write(priv, ICMCR, MDBS | MIE);
rcar_i2c_write(priv, ICMSR, 0);
rcar_i2c_write(priv, ICMAR, 0);
}
--
1.9.3
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