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[v2,for-4.9,07/32] i2c: bcm2835: Use dev_dbg logging on transfer errors

Message ID 1491388344-13521-8-git-send-email-amit.pundir@linaro.org
State New
Headers show
Series Stable commits picked up from lede project | expand

Commit Message

Amit Pundir April 5, 2017, 10:31 a.m. UTC 
From: Noralf Trønnes <noralf@tronnes.org>


Writing to an AT24C32 generates on average 2x i2c transfer errors per
32-byte page write. Which amounts to a lot for a 4k write. This is due
to the fact that the chip doesn't respond during it's internal write
cycle when the at24 driver tries and retries the next write.
Only a handful drivers use dev_err() on transfer error, so switch to
dev_dbg() instead.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Reviewed-by: Eric Anholt <eric@anholt.net>

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

(cherry picked from commit 23c9540b3ad1d7473fe40df80074d0fb0bf04869)
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

---
 drivers/i2c/busses/i2c-bcm2835.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.7.4
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Patch

diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
index d2ba1a4..54d510a 100644
--- a/drivers/i2c/busses/i2c-bcm2835.c
+++ b/drivers/i2c/busses/i2c-bcm2835.c
@@ -216,7 +216,7 @@  static int bcm2835_i2c_xfer_msg(struct bcm2835_i2c_dev *i2c_dev,
 	    (msg->flags & I2C_M_IGNORE_NAK))
 		return 0;
 
-	dev_err(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err);
+	dev_dbg(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err);
 
 	if (i2c_dev->msg_err & BCM2835_I2C_S_ERR)
 		return -EREMOTEIO;