From: Faiz Abbas <faiz_abbas@ti.com>
To: Adrian Hunter <adrian.hunter@intel.com>,
<linux-kernel@vger.kernel.org>, <linux-mmc@vger.kernel.org>
Cc: <ulf.hansson@linaro.org>, <shawn.lin@rock-chips.com>
Subject: Re: [PATCH 0/3] Fix issues with command queuing in arasan controllers
Date: Wed, 8 Jan 2020 17:34:34 +0530 [thread overview]
Message-ID: <b34a07a7-8814-f1dd-3a90-5009af6b9eeb@ti.com> (raw)
In-Reply-To: <9c74c1b9-8ae4-49be-68e3-8e827d07cc66@intel.com>
Hi Adrian,
On 08/01/20 5:29 pm, Adrian Hunter wrote:
> On 8/01/20 1:49 pm, Faiz Abbas wrote:
>> 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?
>
> I meant hook host->mmc_host_ops.execute_tuning and call
> sdhci_execute_tuning() and then sdhci_reset(), like in intel_execute_tuning().
>
Ok. Makes sense.
Thanks,
Faiz
prev parent reply other threads:[~2020-01-08 12:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-30 9:23 [PATCH 0/3] Fix issues with command queuing in arasan controllers Faiz Abbas
2019-12-30 9:23 ` [PATCH 1/3] mmc: sdhci: Add Quirk to reset data lines after tuning Faiz Abbas
2019-12-30 9:23 ` [PATCH 2/3] mmc: sdhci_am654: Enable Quirk to reset data " Faiz Abbas
2019-12-30 9:23 ` [RFT PATCH 3/3] mmc: sdhci-of-arasan: Fix Command Queuing enable handling Faiz Abbas
2020-01-03 0:36 ` Shawn Lin
2020-01-08 11:30 ` [PATCH 0/3] Fix issues with command queuing in arasan controllers Faiz Abbas
2020-01-08 11:42 ` Adrian Hunter
2020-01-08 11:49 ` Faiz Abbas
2020-01-08 11:59 ` Adrian Hunter
2020-01-08 12:04 ` Faiz Abbas [this message]
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