From: Andy Gross <andy.gross@linaro.org>
To: Abhishek Sahu <absahu@codeaurora.org>
Cc: Sricharan R <sricharan@codeaurora.org>,
Wolfram Sang <wsa@the-dreams.de>,
David Brown <david.brown@linaro.org>,
linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 08/12] i2c: qup: change completion timeout according to transfer length
Date: Tue, 27 Feb 2018 17:05:43 -0600 [thread overview]
Message-ID: <20180227230543.GI20901@hector.attlocal.net> (raw)
In-Reply-To: <6a1983c0ca81afce908f622a53abd563@codeaurora.org>
On Mon, Feb 19, 2018 at 04:26:18PM +0530, Abhishek Sahu wrote:
> On 2018-02-16 10:18, Sricharan R wrote:
> >On 2/3/2018 1:28 PM, Abhishek Sahu wrote:
> >>Currently the completion timeout is being taken according to
> >>maximum transfer length which is too high if SCL is operating in
> >>high frequency. This patch calculates timeout on the basis of
> >>one-byte transfer time and uses the same for completion timeout.
> >>
> >>Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
> >>---
> >> drivers/i2c/busses/i2c-qup.c | 9 ++++++---
> >> 1 file changed, 6 insertions(+), 3 deletions(-)
> >>
> >>diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
> >>index a91fc70..6df65ea 100644
> >>--- a/drivers/i2c/busses/i2c-qup.c
> >>+++ b/drivers/i2c/busses/i2c-qup.c
> >>@@ -130,8 +130,8 @@
> >> #define MX_TX_RX_LEN SZ_64K
> >> #define MX_BLOCKS (MX_TX_RX_LEN / QUP_READ_LIMIT)
> >>
> >>-/* Max timeout in ms for 32k bytes */
> >>-#define TOUT_MAX 300
> >>+/* Min timeout for i2c transfers */
> >>+#define TOUT_MIN 2
> >>
> >
> > may be you can mention, why is this 2 ?
> >
>
> This 2 seconds is timeout which I am adding on the top of maximum
> xfer time calculated from bus speed to compensate the interrupt
> latency and other factors. It will make xfer timeout minimum as
> 2 seconds.
>
> I will update the comment to explain it in more detail.
Once you do that add:
Reviewed-by: Andy Gross <andy.gross@linaro.org>
next prev parent reply other threads:[~2018-02-27 23:05 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-03 7:58 [PATCH 00/12] Major code reorganization to make all i2c transfers working Abhishek Sahu
2018-02-03 7:58 ` [PATCH 01/12] i2c: qup: fixed releasing dma without flush operation completion Abhishek Sahu
2018-02-08 14:03 ` Sricharan R
2018-02-19 10:24 ` Abhishek Sahu
2018-02-27 21:46 ` Christ, Austin
2018-02-27 22:24 ` Andy Gross
2018-02-03 7:58 ` [PATCH 02/12] i2c: qup: minor code reorganization for use_dma Abhishek Sahu
2018-02-27 21:48 ` Christ, Austin
2018-02-27 22:26 ` Andy Gross
2018-02-03 7:58 ` [PATCH 03/12] i2c: qup: remove redundant variables for BAM SG count Abhishek Sahu
2018-02-09 2:16 ` Sricharan R
2018-02-19 10:26 ` Abhishek Sahu
2018-02-27 21:51 ` Christ, Austin
2018-02-27 22:28 ` Andy Gross
2018-02-03 7:58 ` [PATCH 04/12] i2c: qup: schedule EOT and FLUSH tags at the end of transfer Abhishek Sahu
2018-02-15 14:31 ` Sricharan R
2018-02-19 10:34 ` Abhishek Sahu
2018-02-27 22:36 ` Andy Gross
2018-03-08 13:40 ` Abhishek Sahu
2018-02-03 7:58 ` [PATCH 05/12] i2c: qup: fix the transfer length for BAM rx EOT FLUSH tags Abhishek Sahu
2018-02-27 22:38 ` Andy Gross
2018-02-03 7:58 ` [PATCH 06/12] i2c: qup: proper error handling for i2c error in BAM mode Abhishek Sahu
2018-02-16 4:33 ` Sricharan R
2018-02-27 22:00 ` Christ, Austin
2018-02-27 22:58 ` Andy Gross
2018-03-12 12:34 ` Abhishek Sahu
2018-02-03 7:58 ` [PATCH 07/12] i2c: qup: use the complete transfer length to choose DMA mode Abhishek Sahu
2018-02-16 4:35 ` Sricharan R
2018-02-19 10:49 ` Abhishek Sahu
2018-02-27 22:01 ` Christ, Austin
2018-02-27 22:59 ` Andy Gross
2018-02-03 7:58 ` [PATCH 08/12] i2c: qup: change completion timeout according to transfer length Abhishek Sahu
2018-02-16 4:48 ` Sricharan R
2018-02-19 10:56 ` Abhishek Sahu
2018-02-27 23:05 ` Andy Gross [this message]
2018-02-03 7:58 ` [PATCH 09/12] i2c: qup: fix buffer overflow for multiple msg of maximum xfer len Abhishek Sahu
2018-02-16 5:21 ` Sricharan R
2018-02-19 11:24 ` Abhishek Sahu
2018-02-27 22:06 ` Christ, Austin
2018-03-12 13:55 ` Abhishek Sahu
2018-02-27 23:15 ` Andy Gross
2018-03-12 12:28 ` Abhishek Sahu
2018-02-03 7:58 ` [PATCH 10/12] i2c: qup: send NACK for last read sub transfers Abhishek Sahu
2018-02-16 5:39 ` Sricharan R
2018-02-27 22:07 ` Christ, Austin
2018-02-27 23:17 ` Andy Gross
2018-02-03 7:58 ` [PATCH 11/12] i2c: qup: reorganization of driver code to remove polling for qup v1 Abhishek Sahu
2018-02-05 23:03 ` kbuild test robot
2018-02-16 7:44 ` Sricharan R
2018-02-19 13:21 ` Abhishek Sahu
2018-02-20 4:32 ` Sricharan R
2018-02-03 7:58 ` [PATCH 12/12] i2c: qup: reorganization of driver code to remove polling for qup v2 Abhishek Sahu
2018-02-16 11:23 ` Sricharan R
2018-02-19 14:08 ` Abhishek Sahu
2018-02-27 23:24 ` Christ, Austin
2018-03-12 13:58 ` Abhishek Sahu
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