linux-kernel - Re: [PATCH 0/3] Fix issues with command queuing in arasan controllers

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Message-ID: <b2600fd2-bcc9-19f6-8bf8-f3bb51da089f@ti.com>
Date:   Wed, 8 Jan 2020 17:19:24 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>
CC:     <ulf.hansson@...aro.org>, <shawn.lin@...k-chips.com>
Subject: Re: [PATCH 0/3] Fix issues with command queuing in arasan controllers

Adrian,

On 08/01/20 5:12 pm, Adrian Hunter wrote:
> On 8/01/20 1:30 pm, Faiz Abbas wrote:
>> Hi,
>>
>> On 30/12/19 2:53 pm, Faiz Abbas wrote:
>>> In some Arasan SDHCI controllers, after tuning, the tuning pattern data
>>> is leftover in the sdhci buffer. This leads to issues with future data
>>> commands, especially when command queuing is enabled. The following
>>> patches help fix this issue by resetting data lines after tuning is
>>> finished. The first two patches have been tested with TI's am65x and
>>> j721e SoCs using the sdhci_am654 driver.
>>>
>>> I have a strong suspicion that this is the same issue with
>>> the sdhci-of-arasan driver where they are forced to dump data from the
>>> buffer before enabling command queuing. I need help from someone with a
>>> compatible platform to test this.
>>>
>>
>> I had some discussions with our hardware team and they say we should be
>> asserting both SRC and SRD reset after tuning to start from a clean
>> state. Will update the patches to do that in v2.
> 
> Can you use the ->execute_tuning() for that instead of a quirk?
> 

->platform_execute_tuning() is called before __sdhci_execute_tuning(). I
need this to be done after that. Should I add a post_tuning() callback?

Thanks,
Faiz