[alsa-devel] [PATCH] S3C64XX I2S: Enable audio-bus clock

jassi brar jassisinghbrar at gmail.com
Sat Nov 7 04:03:34 CET 2009

On Sat, Nov 7, 2009 at 12:09 AM, Mark Brown
<broonie at opensource.wolfsonmicro.com> wrote:
> On Fri, Nov 06, 2009 at 11:48:30PM +0900, jassi brar wrote:
>> On Fri, Nov 6, 2009 at 10:13 PM, Mark Brown
>> > I'll apply this but I beleive the driver ought to be smarter with the
>> > clocks - AFAICT from the documentation the audio bus clock is not
>> > guaranteed to be needed.
>> this patch only adds the missing code, its no modification.
> I'm not sure what you mean by that?
Sorry, if its hard to understand what i write. I will write detailed

Seems the clk_enable for cclk went 'missing' during segregation of one driver
into separate SoC specific(s3c2412, s3c64xx) and version
specific(s3c-i2s-v2) parts..
PCLK(iis) and CLKAUDIO(audio-bus) are equally potential candidates of
I2S source clock. If the driver gets and enables 'iis' there is no reason why it
should only get and not enable 'audio-bus'.

By the design of the driver, clk_enable for 'audio-bus' too ought to be in
 driver (just like 'iis'). If some user is enabling it somewhere else, he/she is
not in line with the design.

> Presumably any system that's
> managing to use the driver as-is is doing so by clocking the block from
> something other than the audio clock so from their point of view it
> isn't needed.
Why overlook the right but missing part? just because users have a work around?

>> s3c64xx-i2s driver sure needs to be upgraded, which i plan to do soon if
>> nobody else does.
> Any news on IISv4 port support?  It'd be good to get the SMDKs to the
> point where they can actually play audio.  I had been expecting some
> followups from your previous patches.
I will resend some patches which were given reviews. I just got busy.
Due to different official priorities, the 6channel support implementation got
delayed. It is definitely on my todo list.

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