From: Wolfram Sang <wsa@the-dreams.de>
To: Sricharan <sricharan@codeaurora.org>
Cc: devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
agross@codeaurora.org, linux-kernel@vger.kernel.org,
linux-i2c@vger.kernel.org, iivanov@mm-sol.com,
galak@codeaurora.org, dmaengine@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, andy.gross@linaro.org,
ntelkar@codeaurora.org, architt@codeaurora.org
Subject: Re: [PATCH V7 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit
Date: Thu, 4 Feb 2016 21:09:03 +0100 [thread overview]
Message-ID: <20160204200903.GE1958@tetsubishi> (raw)
In-Reply-To: <001401d15988$59f6dcf0$0de496d0$@codeaurora.org>
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Hi,
> Ah, so what I meant above is there is no 'STOP' bit between each msg in
> i2c_msgs,
> but 'REAPEATED_START' still holds true. We are sending 'START' bit for each
> msg.
> So these is how each msg in i2c_msg is sent,
>
> |------MSG1--------|-----MSG2---------|------MSG3------------|
>
> |START|DATA|------|START|DATA|---|START|DATA|STOP|
>
> If my commit text does not make this clear, I can reword that ?
OK, now this looks to me perfectly fine: A number of *messages*
concatenated into one *transfer* by repeated start. That's the way it
should be.
So, I'd simply remove these words:
"The QUP i2c hardware has no way to inform that there should not be a
'STOP' at the end of transaction. The only way to implement this is to
coalesce all the i2c_msg in i2c_msgs in to one transaction and transfer
them."
This sounded like the HW needed a special handling, so I was under the
impression REP_START was broken. However, unless I misunderstood
something again, this now sounds like the standard case and we can keep
the commit message simple. If you are okay with that, I can update it
here, no need to resend.
Thanks,
Wolfram
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next prev parent reply other threads:[~2016-02-04 20:09 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-19 10:02 [PATCH V7 0/6] i2c: qup: Add support for v2 tags and bam dma Sricharan R
2016-01-19 10:02 ` [PATCH V7 1/6] i2c: qup: Change qup_wait_writeready function to use for all timeouts Sricharan R
2016-02-12 18:37 ` Wolfram Sang
2016-01-19 10:02 ` [PATCH V7 2/6] i2c: qup: Add V2 tags support Sricharan R
2016-02-12 18:37 ` Wolfram Sang
2016-01-19 10:02 ` [PATCH V7 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit Sricharan R
2016-01-24 11:29 ` Wolfram Sang
2016-01-28 4:57 ` Sricharan
2016-02-04 20:09 ` Wolfram Sang [this message]
2016-02-05 8:00 ` Sricharan
2016-02-12 18:38 ` Wolfram Sang
2016-01-19 10:02 ` [PATCH V7 4/6] i2c: qup: Add bam dma capabilities Sricharan R
2016-02-12 18:37 ` Wolfram Sang
2016-02-12 18:42 ` Wolfram Sang
2016-02-13 6:58 ` Sricharan
2016-02-22 12:24 ` Sricharan
2016-02-22 12:32 ` Wolfram Sang
2016-02-22 13:41 ` Sricharan
2016-01-19 10:02 ` [PATCH V7 5/6] dts: msm8974: Add blsp2_bam dma node Sricharan R
2016-03-25 23:17 ` Bjorn Andersson
2016-03-26 2:26 ` Andy Gross
2016-03-28 12:59 ` Sricharan
2016-01-19 10:02 ` [PATCH V7 6/6] dts: msm8974: Add dma channels for blsp2_i2c1 node Sricharan R
2016-01-19 10:14 ` [PATCH V7 0/6] i2c: qup: Add support for v2 tags and bam dma Sricharan
2016-01-24 11:33 ` Wolfram Sang
2016-01-28 5:27 ` Sricharan
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