linux-kernel - Re: [PATCH v1 2/2] mmc: sdhci: Use the SW timer when the HW timer cannot meet the timeout value required by the device

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Date:   Thu, 30 Sep 2021 11:59:34 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Bean Huo <huobean@...il.com>, Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Bean Huo <beanhuo@...ron.com>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] mmc: sdhci: Use the SW timer when the HW timer
 cannot meet the timeout value required by the device

On 30/09/2021 11:34, Bean Huo wrote:
> Hi Adrian,
> 
> 
> Thanks.
> I want to give a short conclusion  for our discussion:
> 
> Based on your information, these sounds disable of HW timer timeout
> interrupt will make eMMC host controller malfunction, in another word,
> the disable of timeout interrupt will make the eMMC host cannot
> correctly provide the completion interrupt. And unless only when the
> SOC vendor signals that their SOC supports that the host side SW can
> disable this HW timeout interrupt, as TI does.
> 
> I studied the SDHCI Spec, and tried to see if there is this kind of
> support statement, but not been found yet. I will check with other SOC
> vendors.
> 
> I have one more question, if you know, please give me your information.
> 
> I did testing on HW timer bahevior in case CQE is on.  Currently, we
> always set the HW timer with the maximum timeout value if CQE is on.
> Based on my testing, the HW timer will never timeout when we enable
> CQE. I changed the HW timer value to be lower, it is the same result.
> Do you know that the HW timer will be inactivated in case CQE is
> on?  but its timeout interrupt is still enabled.

No I don't know how different CQE handle timeouts.

> 
> Kind regards,
> Bean
>