linux-kernel - Re: [PATCH v2 0/6] ARM: dts: Use correct CD properties for SDIO and eMMC in Snow and Peach

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Message-ID: <563F60B1.6030906@osg.samsung.com>
Date:	Sun, 8 Nov 2015 11:48:17 -0300
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Kukjin Kim <kgene@...nel.org>
Cc:	Alim Akhtar <alim.akhtar@...sung.com>,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Douglas Anderson <dianders@...omium.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v2 0/6] ARM: dts: Use correct CD properties for SDIO and
 eMMC in Snow and Peach

Hello Kukjin,

On 10/19/2015 12:04 AM, Alim Akhtar wrote:
> Hi Javier,
> 
> On 10/15/2015 10:21 PM, Javier Martinez Canillas wrote:
>> Hello,
>>
>> The Exynos Chromebooks DTS don't use the correct card detection properties
>> since these were carried from the vendor tree that had a reason to do so.
>>
>> There are two things that I noticed:
>>
>> 1) The Marvell WiFi SDIO is marked as broken-cd instead of non-removable:
>>
>> This causes the device to be removed when the system enters into a suspend
>> state which leads to the following warning when the system is resumed:
>>
>> [  181.944636] mmc2: error -2 during resume (card was removed?)
>>
>> The rationale for using broken-cd is explained in downstream commit [0] and
>> was that using the non-removable property caused issues with the mwifiex
>> driver since the reset logic called the mmc_{remove,add}_host() functions.
>>
>> But the reset logic in the mwifiex mainline driver has changed and this is
>> no longer the case so it's safe to use the non-removable property AFAICT.
>>
>> 2) The eMMC node has both broken-cd and non-removable but the MMC DT binding
>> doc (Documentation/devicetree/bindings/mmc/mmc.txt) mentions that only one
>> of these card detection properties should be used.
>>
>> So this series change both the SDIO WiFi and eMMC device nodes in the Snow,
>> Peach Pi and Peach Pit boards DTS to use the non-removable property.
>>
>> To test, I've cherry picked commit [1] from the vendor tree that adds a
>> debugfs entry to force a card reset and after the reset, the WiFi card still
>> works correctly:
>>
>> $ echo 1 > /sys/kernel/debug/mwifiex/mlan0/reset
>>
>> And also tested that both eMMC and WiFi are working correctly after a S2R.
>>
>> The test were made on an Exynos5800 Peach Pi but I don't have access to a
>> Snow anymore so testing patch 3/6 and 6/6 on that board will be appreciated.
>>
>> v1 of the series was [2] and this version fixes issues pointed out by Tomeu.
>>
>> Changes since v1:
>>   - Replace broken-cd for non-removable in the correct mmc node for Snow.
>>   - Correct the card detetion properties for eMMC in Snow, Pit and Pi.
>>   - Also remove the card-detect-delay property when using non-removable.
>>
>> [0]: https://chromium.googlesource.com/chromiumos/third_party/kernel/+/ad348e1e2381
>> [1]: https://chromium.googlesource.com/chromiumos/third_party/kernel/+/5995363523de
>> [2]: https://lkml.org/lkml/2015/10/15/294
>>
>> Best regards,
>> Javier
>>
>>
>> Javier Martinez Canillas (6):
>>    ARM: dts: Mark SDIO as non-removable in exynos5800-peach-pi
>>    ARM: dts: Mark SDIO as non-removable in exynos5420-peach-pit
>>    ARM: dts: Mark SDIO as non-removable in exynos5250-snow-common
>>    ARM: dts: Remove broken-cd from eMMC node in exynos5800-peach-pi
>>    ARM: dts: Remove broken-cd from eMMC node in exynos5420-peach-pi
>>    ARM: dts: Mark eMMC as non-removable in exynos5250-snow-common
>>
> This series looks good to me, so feel free to add
> Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
> and for patch 4 and 5: Tested-by: Alim Akhtar <alim.akhtar@...sung.com>
> Thanks.
>

You said that you are going to take this series once Alim tested / gave
his feedback but that happened weeks ago and I still don't see these in
your tree.

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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