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authorNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>2015-03-25 10:47:45 +0900
committerNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>2015-03-25 10:47:45 +0900
commit1c35920d85e424b3f65aa6df1dbde689dd6ec007 (patch)
tree58b2cacb3674111aad5a4ded694db0cef5cf55f3 /meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0019-i2c-busses-rcar-Workaround-arbitration-loss-error.patch
commit BSP v1.8.0
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Diffstat (limited to 'meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0019-i2c-busses-rcar-Workaround-arbitration-loss-error.patch')
-rw-r--r--meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0019-i2c-busses-rcar-Workaround-arbitration-loss-error.patch31
1 files changed, 31 insertions, 0 deletions
diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0019-i2c-busses-rcar-Workaround-arbitration-loss-error.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0019-i2c-busses-rcar-Workaround-arbitration-loss-error.patch
new file mode 100644
index 0000000..209d1b4
--- /dev/null
+++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0019-i2c-busses-rcar-Workaround-arbitration-loss-error.patch
@@ -0,0 +1,31 @@
+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
+