linux-kernel - Re: [PATCH v3 06/13] mmc: mmci: Qcomm: Add 3 clock cycle delay after register write

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Date:	Mon, 26 May 2014 18:04:31 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Russell King <linux@....linux.org.uk>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Chris Ball <chris@...ntf.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v3 06/13] mmc: mmci: Qcomm: Add 3 clock cycle delay after
 register write


>
> I am not sure I like this approach. For each and every writel
> (including pio_writes) you will add a few cpu cycles, since you need
> to  check for "mclk_delayed_writes" no matter of variant.
>

> How about, adding a new function pointer in the struct mmci_host, for
> "writel operations" which you could set up in probe phase instead?
>

Yes, this is an additional check for other variants. I will try the 
function pointer method that you suggested.

Thanks,
srini


> Kind regards
> Ulf Hansson
>
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