From: Lukasz Stelmach <l.stelmach@samsung.com>
To: Mark Brown <broonie@kernel.org>
Cc: linux-samsung-soc@vger.kernel.org, b.zolnierkie@samsung.com,
linux-kernel@vger.kernel.org,
Krzysztof Kozlowski <krzk@kernel.org>,
linux-spi@vger.kernel.org, Kukjin Kim <kgene@kernel.org>,
Andi Shyti <andi@etezian.org>,
linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com
Subject: Re: [PATCH 1/8] spi: spi-s3c64xx: swap s3c64xx_spi_set_cs() and s3c64xx_enable_datapath()
Date: Wed, 19 Aug 2020 16:01:52 +0200 [thread overview]
Message-ID: <dleftj4koy20q7.fsf%l.stelmach@samsung.com> (raw)
In-Reply-To: <20200819131635.GD5441@sirena.org.uk> (Mark Brown's message of "Wed, 19 Aug 2020 14:16:35 +0100")
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It was <2020-08-19 śro 14:16>, when Mark Brown wrote:
> On Wed, Aug 19, 2020 at 02:58:22PM +0200, Krzysztof Kozlowski wrote:
>> On Wed, Aug 19, 2020 at 02:51:27PM +0200, Lukasz Stelmach wrote:
>
>> > Honestly, I don't know and I couldn't find out why. It makes stuff
>> > work. There has been a commit like this before
>
>> > 0f5a751ace25 spi/s3c64xx: Enable GPIO /CS prior to starting hardware
>
>> > Apparently, it was lost in
>
>> > 0732a9d2a155 spi/s3c64xx: Use core message handling
>
>> Then describe at least this... maybe Mark knows why he brough back old
>> code after refactoring?
>
> I'm not sure what's being referred to as being lost in the second commit
> TBH.
Order of enable_cs() and enable_datapath(). The order 0f5a sets makes
(for a reaseon I don't know) my devices work. In the latter commit,
which rewrites "everything", enable_datapath() is called before what
later (in aa4964c4eb3e) became s3c64xx_spi_set_cs().
> The first commit is simple code motion rather than a correctness
> thing, and more related to the handling of GPIO controlled chip
> selects according to the description (which people should be using
> with that controller anyway where possible IIRC, the native chip
> select has too many assumptions about what it's doing).
Funny, but without the automatic CS control (see the next patch in this
series) my stuff does not work.
> I don't know that I ever actually used a system that used the native
> chip select as the actual chip select. Perhaps some quirk was
> introduced where the chip select signal does something?
>
> The commit is also lacking a description of what the issues that are
> being fixed are.
On Exynos3250 DMA transfers from SPI longer than 512 fail.
--
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics
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next prev parent reply other threads:[~2020-08-19 14:03 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200819123225eucas1p28be1b1920ade0ba8997bc17da97599b6@eucas1p2.samsung.com>
2020-08-19 12:32 ` [PATCH 0/8] Some fixes for spi-s3c64xx Łukasz Stelmach
[not found] ` <CGME20200819123226eucas1p16c9b90330d957344f99f6ee461190085@eucas1p1.samsung.com>
2020-08-19 12:32 ` [PATCH 1/8] spi: spi-s3c64xx: swap s3c64xx_spi_set_cs() and s3c64xx_enable_datapath() Łukasz Stelmach
2020-08-19 12:38 ` Krzysztof Kozlowski
[not found] ` <CGME20200819125150eucas1p1965fab59b6e75cf54cac262161c5695b@eucas1p1.samsung.com>
2020-08-19 12:51 ` Lukasz Stelmach
2020-08-19 12:58 ` Krzysztof Kozlowski
2020-08-19 13:16 ` Mark Brown
[not found] ` <CGME20200819140203eucas1p2818858289f2394b32f3c647e47705cd2@eucas1p2.samsung.com>
2020-08-19 14:01 ` Lukasz Stelmach [this message]
2020-08-19 19:12 ` Mark Brown
[not found] ` <CGME20200820101251eucas1p237a794cc11f44c709c0ccdfef766702c@eucas1p2.samsung.com>
2020-08-20 10:12 ` Lukasz Stelmach
[not found] ` <CGME20200819123226eucas1p2f4be625abd7ddaac2f09bdf94395346b@eucas1p2.samsung.com>
2020-08-19 12:32 ` [PATCH 2/8] spi: spi-s3s64xx: Add S3C64XX_SPI_QUIRK_CS_AUTO for Exynos3250 Łukasz Stelmach
2020-08-19 12:39 ` Krzysztof Kozlowski
[not found] ` <CGME20200819130122eucas1p27e9e84c4399d01409858de6d01e11b52@eucas1p2.samsung.com>
2020-08-19 13:01 ` Lukasz Stelmach
2020-08-19 13:06 ` Krzysztof Kozlowski
2020-08-19 19:38 ` Mark Brown
[not found] ` <CGME20200820104737eucas1p140e3c575eb692a1de54c5a702951ebfe@eucas1p1.samsung.com>
2020-08-20 10:47 ` Lukasz Stelmach
[not found] ` <CGME20200819123226eucas1p2dc50cd60f71f2155524ec21bf4dcdd74@eucas1p2.samsung.com>
2020-08-19 12:32 ` [PATCH 3/8] spi: spi-s3c64xx: Report more information when errors occur Łukasz Stelmach
2020-08-19 12:43 ` Krzysztof Kozlowski
[not found] ` <CGME20200819123227eucas1p1f56cc06dc6c368abf2d3952ba04f37e2@eucas1p1.samsung.com>
2020-08-19 12:32 ` [PATCH 4/8] spi: spi-s3c64xx: Rename S3C64XX_SPI_SLAVE_* to S3C64XX_SPI_CS_* Łukasz Stelmach
2020-08-19 12:44 ` Krzysztof Kozlowski
[not found] ` <CGME20200819123227eucas1p11cd47cf281a035ed02d5fc819a0370c1@eucas1p1.samsung.com>
2020-08-19 12:32 ` [PATCH 5/8] spi: spi-s3c64xx: Fix doc comment for struct s3c64xx_spi_driver_data Łukasz Stelmach
2020-08-19 12:37 ` Krzysztof Kozlowski
[not found] ` <CGME20200819132540eucas1p1897948a4f4008ab4946120dd4fa5c192@eucas1p1.samsung.com>
2020-08-19 13:25 ` Lukasz Stelmach
[not found] ` <CGME20200819123227eucas1p11ec027714c16d5a66c89c6ef1f7b3604@eucas1p1.samsung.com>
2020-08-19 12:32 ` [PATCH 6/8] spi: spi-s3c64xx: Check return values Łukasz Stelmach
2020-08-19 12:48 ` Krzysztof Kozlowski
[not found] ` <CGME20200819154154eucas1p1e88747d2495e6d1074991419504066df@eucas1p1.samsung.com>
2020-08-19 15:41 ` Lukasz Stelmach
2020-08-19 16:13 ` Krzysztof Kozlowski
[not found] ` <CGME20200819123228eucas1p19ac7fc04dec52c733ab9c770e91f6ace@eucas1p1.samsung.com>
2020-08-19 12:32 ` [PATCH 7/8] spi: spi-s3c64xx: Increase transfer timeout Łukasz Stelmach
2020-08-19 12:49 ` Krzysztof Kozlowski
[not found] ` <CGME20200819133957eucas1p293192baeabb9788ac9148068c1627a57@eucas1p2.samsung.com>
2020-08-19 13:39 ` Lukasz Stelmach
2020-08-21 7:10 ` Krzysztof Kozlowski
[not found] ` <CGME20200819123228eucas1p132d530d17256f887d93ed7792f5b9587@eucas1p1.samsung.com>
2020-08-19 12:32 ` [PATCH 8/8] spi: spi-s3c64xx: Turn on interrupts upon resume Łukasz Stelmach
2020-08-19 12:53 ` Krzysztof Kozlowski
[not found] ` <CGME20200819133334eucas1p2080182850c7ba84829e3304a1172afff@eucas1p2.samsung.com>
2020-08-19 13:33 ` Lukasz Stelmach
2020-08-19 12:50 ` [PATCH 0/8] Some fixes for spi-s3c64xx Krzysztof Kozlowski
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