linux-kernel - Re: [PATCH 1/2] mmc: sdhci: Add Quirk for enabling HISPD under special conditions

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Date:   Mon, 1 Apr 2019 16:14:21 +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>
Subject: Re: [PATCH 1/2] mmc: sdhci: Add Quirk for enabling HISPD under
 special conditions

Hi Adrian,

On 01/04/19 2:42 PM, Adrian Hunter wrote:
> On 1/04/19 12:01 PM, Faiz Abbas wrote:
>> Hi Adrian,
>>
>> On 01/04/19 2:21 PM, Adrian Hunter wrote:
>>> On 29/03/19 4:22 PM, Faiz Abbas wrote:
>>>> Some controllers on TI devices requires the HISPD bit to be cleared
>>>> even in some high speed modes. Add a quirk that facilitates this
>>>> requirement.
>>>
>>> Could you use sdhci I/O accessors for this?
>>
>> Can you elaborate? Not sure how this would be solved with
>> CONFIG_MMC_SDHCI_IO_ACCESSORS.
> 
> In ->writeb()
> 
> if (reg == SDHCI_HOST_CONTROL) {
> 	if (host->mmc->ios->timing == whatever)
> 		val &= ~SDHCI_CTRL_HISPD;
> }
> 
> writeb(val, host->ioaddr + reg);

This is a really good idea. Will use it in v2. Thanks.

Regards,
Faiz