From: Simon Horman <horms@verge.net.au>
To: "Brandt, Chris" <Chris.Brandt@renesas.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
"linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>,
Chris Ball <cjb@laptop.org>, Magnus Damm <magnus.damm@gmail.com>
Subject: Re: [PATCH] mmc: sh_mmcif: mmc->f_max heuristic
Date: Thu, 21 Jun 2012 09:47:51 +0900 [thread overview]
Message-ID: <20120621004751.GB10003@verge.net.au> (raw)
In-Reply-To: <A389CA2909F7E548A28A6A30A9446C0903651FAAD5@REAMBX.NA.RTA>
On Wed, Jun 20, 2012 at 07:56:44AM -0700, Brandt, Chris wrote:
> > I would be very happy if someone with access to
> > the documentation could shed some further light on this.
>
> According to the SH7757 manual, setting the CLKDIV[3:0] in the CE_CLK_CTRL register 0xF selects Pck as the bus clock frequency. So, unlike other devices where Pck/2 (CLKDIV[3:0]=0) is the max bus speed, the SH7757 can run at Pck when CLKDIV=0xF.
Thanks Chris,
please correct me if I am wrong, but that seems to indicate the heuristic
is correct. At least for the sh7757 and sh7372.
next prev parent reply other threads:[~2012-06-21 0:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-20 5:58 [PATCH] mmc: sh_mmcif: mmc->f_max heuristic Simon Horman
2012-06-20 6:49 ` Guennadi Liakhovetski
2012-06-20 7:02 ` Simon Horman
2012-06-20 14:56 ` Brandt, Chris
2012-06-21 0:47 ` Simon Horman [this message]
2012-06-21 14:11 ` Brandt, Chris
2012-06-21 23:30 ` Simon Horman
-- strict thread matches above, loose matches on Subject: below --
2012-06-21 23:49 Simon Horman
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