linux-kernel - Re: [PATCH] dw_dmac: don't exceed AHB master number in dwc_get_data

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Message-ID: <CAOh2x=mzcxT=8=RS1Fa_Vn3Frixj9BNEeYGQ0NH+00YV1i-VHw@mail.gmail.com>
Date:	Tue, 15 Jan 2013 14:31:21 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCH] dw_dmac: don't exceed AHB master number in dwc_get_data_width

On Tue, Jan 15, 2013 at 12:35 PM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>> The details of the patch are fine, but i didn't get how do you get
>> master 1 selected
>> on a system where you have only 1 master?
>
> min_t(..., nr_masters - 1, m) defines this. m is returned value with
> default settings, let's say 1. In that case if nr_masters is also 1
> the min_t(..., 1-1, 1) returns 0.
>
> The value of nr_masters itself is come from autoconfig or platform data.

:)
You didn't get me. How this code would work is pretty easy to understand.
What i wanted to know is, the master information is coming from slave drivers
and they must select master zero always. How would master 1 be selected ever
in this driver.
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