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From: Wolfram Sang <wsa@the-dreams.de>
To: Andrzej Hajda <a.hajda@samsung.com>
Cc: Andi Shyti <andi.shyti@samsung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	"open list:I2C SUBSYSTEM" <linux-i2c@vger.kernel.org>,
	"moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES"
	<linux-samsung-soc@vger.kernel.org>
Subject: Re: [3/3] i2c: exynos5: do not check TRANS_STATUS in case of Exynos7 variant
Date: Thu, 18 Jan 2018 00:23:08 +0100	[thread overview]
Message-ID: <20180117232307.aigvkl564p4jzms3@ninjato> (raw)
In-Reply-To: <bddb6ff4-22cd-9f01-7a63-295b19eaef90@samsung.com>

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On Tue, Jan 16, 2018 at 10:40:36AM +0100, Andrzej Hajda wrote:
> On 15.01.2018 21:53, Wolfram Sang wrote:
> > On Thu, Nov 30, 2017 at 03:30:07PM +0100, Andrzej Hajda wrote:
> >> HSI2C_MASTER_ST_LOSE state is not documented properly, extensive tests
> >> show that hardware is usually able to recover from this state without
> >> interrupting the transfer. On the other side enforcing transfer repetition
> >> in such case does not help in many situations, especially on busy systems
> >> and causes -EAGAIN and -ETIMEOUT errors. Moreover documentation says that
> >> such state can be caused by slave clock stretching, and should not be treated
> >> as an error.
> >>
> >> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> > Can this be applied independently of my comments to patch 2?
> >
> Yes, please apply it alone. I will continue work on patch 2.

I just thought it might be nice to have a comment where you removed the
code summarizing your findings. So we will remember about this in the
future. Makes sense?


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  reply	other threads:[~2018-01-17 23:23 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20171130143017eucas1p172b94622814eff172a27176c82f6e6fe@eucas1p1.samsung.com>
2017-11-30 14:30 ` [PATCH 0/3] i2c: exynos5: bus recovery implementation Andrzej Hajda
     [not found]   ` <CGME20171130143017eucas1p2f68094c72e4559e1a16cf334c3200950@eucas1p2.samsung.com>
2017-11-30 14:30     ` [PATCH 1/3] i2c: exynos5: change internal transmission timeout to 100ms Andrzej Hajda
2018-01-15 20:54       ` [1/3] " Wolfram Sang
     [not found]   ` <CGME20171130143018eucas1p13bd2ce9263f9ac016ab3b779920b512e@eucas1p1.samsung.com>
2017-11-30 14:30     ` [PATCH 2/3] i2c: exynos5: implement bus recovery functionality Andrzej Hajda
2018-01-15 20:52       ` [2/3] " Wolfram Sang
2018-01-16  8:35         ` Andrzej Hajda
2018-01-17 23:30           ` Wolfram Sang
     [not found]   ` <CGME20171130143018eucas1p1eba2c4f3361e0752cc53a25d217ce616@eucas1p1.samsung.com>
2017-11-30 14:30     ` [PATCH 3/3] i2c: exynos5: do not check TRANS_STATUS in case of Exynos7 variant Andrzej Hajda
2018-01-15 20:53       ` [3/3] " Wolfram Sang
2018-01-16  9:40         ` Andrzej Hajda
2018-01-17 23:23           ` Wolfram Sang [this message]
2018-01-26  7:17             ` Andrzej Hajda
2018-01-26  9:30               ` Wolfram Sang
2017-12-07  7:36   ` [PATCH 0/3] i2c: exynos5: bus recovery implementation Andi Shyti

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