linux-kernel - Re: [PATCH] ARC: [plat-hsdk]: Increase SDIO CIU frequency to 50000000Hz

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Date:   Wed, 11 Oct 2017 17:07:58 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Vineet Gupta" <Vineet.Gupta1@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH] ARC: [plat-hsdk]: Increase SDIO CIU frequency to
 50000000Hz

Hi Eugeniy,

On Wed, 2017-10-11 at 20:01 +0300, Eugeniy Paltsev wrote:
> With current SDIO CIU clock frequency (12500000Hz) DW MMC
> controller fails to initialize some SD cards (which don't
> support slow mode).
> 
> So increase SDIO CIU frequency from 12500000Hz to 50000000Hz by
> switching from the default divisor value (div-by-8) to the
> minimum possible value of the divisor (div-by-2) in HSDK platform
> code.
> 
> Reported-by: Vineet Gupta <vgupta@...opsys.com>
> Tested-by: Vineet Gupta <vgupta@...opsys.com>
> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>

Given this change doesn't introduce any regressions
or at least so far we only saw 1 card started to work
(confirmed by Vineet) while cards we tried locally continue to work...

Acked-by: Alexey Brodkin <abrodkin@...opsys.com>