2017-03-04 18:37:50 +00:00
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From bff25210b88dc7b71ee9c2626e42a939072dec64 Mon Sep 17 00:00:00 2001
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2017-02-07 20:07:54 +00:00
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From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
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Date: Mon, 19 Sep 2016 17:19:41 +0200
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Subject: [PATCH] i2c: bcm2835: Use dev_dbg logging on transfer errors
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Writing to an AT24C32 generates on average 2x i2c transfer errors per
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32-byte page write. Which amounts to a lot for a 4k write. This is due
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to the fact that the chip doesn't respond during it's internal write
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cycle when the at24 driver tries and retries the next write.
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Only a handful drivers use dev_err() on transfer error, so switch to
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dev_dbg() instead.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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Reviewed-by: Eric Anholt <eric@anholt.net>
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---
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drivers/i2c/busses/i2c-bcm2835.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/i2c/busses/i2c-bcm2835.c
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+++ b/drivers/i2c/busses/i2c-bcm2835.c
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@@ -216,7 +216,7 @@ static int bcm2835_i2c_xfer_msg(struct b
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(msg->flags & I2C_M_IGNORE_NAK))
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return 0;
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- dev_err(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err);
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+ dev_dbg(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err);
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if (i2c_dev->msg_err & BCM2835_I2C_S_ERR)
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return -EREMOTEIO;
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