Thread (6 messages) 6 messages, 2 authors, 2016-05-06

[PATCH 2/2] drivers: i2c: qup: Fix error handling

From: Sricharan <hidden>
Date: 2016-05-06 04:09:29
Also in: linux-arm-msm, linux-devicetree, linux-i2c, lkml

Hi Andy,
-----Original Message-----
From: Andy Gross [mailto:andy.gross at linaro.org]
Sent: Thursday, May 05, 2016 10:52 PM
To: Sricharan R <redacted>
Cc: devicetree at vger.kernel.org; architt at codeaurora.org; linux-arm-
msm at vger.kernel.org; ntelkar at codeaurora.org; galak at codeaurora.org;
linux-kernel at vger.kernel.org; linux-i2c at vger.kernel.org; iivanov at mm-
sol.com; agross at codeaurora.org; dmaengine at vger.kernel.org; linux-arm-
kernel at lists.infradead.org
Subject: Re: [PATCH 2/2] drivers: i2c: qup: Fix error handling

On Mon, May 02, 2016 at 10:53:57AM +0530, Sricharan R wrote:
quoted
Among the bus errors reported from the QUP_MASTER_STATUS register
only
quoted
NACK is considered and transfer gets suspended, while other errors are
ignored. Correct this and suspend the transfer for other errors as
well. This avoids unnessecary 'timeouts' which happens when waiting
for events that would never happen when there is already an error
condition on the bus.

Signed-off-by: Sricharan R <redacted>
---
 drivers/i2c/busses/i2c-qup.c | 34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)
Reviewed-by: Andy Gross <redacted>
 Thanks.
<snip>
quoted
@@ -1227,6 +1240,9 @@ static int qup_i2c_xfer_v2(struct i2c_adapter
*adap,
quoted
 	struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
 	int ret, len, idx = 0, use_dma = 0;

+	qup->bus_err = 0;
+	qup->qup_err = 0;
+
What about the initial setting of these?  Does this need to be removed
from
the main xfer function?
  Thanks for the catch. Will remove in bam_xfer , redundant.
  Now that there are i2x_xfer_v2 and i2c_xfer, 
   its not set in the old i2c_xfer call, where as it should be set there
   as well. I will change this and resend.

Regards,
 Sricharan
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