linux-kernel - Re: [PATCH 2/3] mmc: add MMC_QUIRK_BROKEN_CLK

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Message-ID: <B4C48E6D-6EEA-4FC4-9FA5-35818F230E0C@marvell.com>
Date:	Mon, 10 Jan 2011 09:18:51 -0800
From:	Philip Rakity <prakity@...vell.com>
To:	Pierre Tardy <tardyp@...il.com>
CC:	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mmc: add MMC_QUIRK_BROKEN_CLK_GATING


On Jan 10, 2011, at 8:57 AM, Pierre Tardy wrote:

>> 
>> 
>> Since the code is not called that often could you change the above code to:
>> 
>>>       if (mmc_card_sdio(card))
>>>               return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
> Well, The comment in the
>>        return true;
>> 
>> more obvious that quirk only applies to sdio.
> 
> Disagree.Actually, before this code, there is a pretty long comment,
> that explain that this quirk only apply to sdio.
> 
> If we figure out later that some sdcard does not like clock gating
> either, we could add this quirk to those bad sdcard as well.

I am okay with this -- if you resubmit -- just indicate the quirk is more generic than just sdio

> 
> Here is the whole resulting function. I think this is clear enough:
> 
> static bool mmc_host_may_gate_card(struct mmc_card *card)
> {
> 
>        /* If there is no card we may gate it */
>        if (!card)
>               return true;
>        /*
>        * Don't gate SDIO cards! These need to be clocked at all times
>        * since they may be independent systems generating interrupts
>        * and other events. The clock requests counter from the core will
>        * go down to zero since the core does not need it, but we will not
>        * gate the clock, because there is somebody out there that may still
>        * be using it.
>        */
>        return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
> 
> 
> }
> Pierre


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