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

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Date:   Wed, 8 Jan 2020 17:00:11 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>
CC:     <ulf.hansson@...aro.org>, <adrian.hunter@...el.com>,
        <shawn.lin@...k-chips.com>
Subject: Re: [PATCH 0/3] Fix issues with command queuing in arasan controllers

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.

Thanks,
Faiz