void-packages/srcpkgs/linux4.9/patches/i2c-bcm2835.patch
2017-01-14 19:44:55 +01:00

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From patchwork Mon Oct 3 20:06:10 2016
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Subject: [v4,3/7] i2c: bcm2835: Use dev_dbg logging on transfer errors
From: =?utf-8?q?Noralf_Tr=C3=B8nnes?= <noralf@tronnes.org>
X-Patchwork-Id: 9360899
Message-Id: <1475525174-28604-4-git-send-email-noralf@tronnes.org>
To: wsa@the-dreams.de, swarren@wwwdotorg.org, eric@anholt.net
Cc: linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org,
=?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Mon, 3 Oct 2016 22:06:10 +0200
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>
---
drivers/i2c/busses/i2c-bcm2835.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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;