[alsa-devel] [PATCH 0/4] davinci-mcasp: fix tdm_slots and CBM/CFS

Liam Girdwood lrg at slimlogic.co.uk
Tue Apr 26 10:16:56 CEST 2011

On Thu, 2011-04-21 at 14:19 -0400, Ben Gardiner wrote:
> This patch series is comprised of three bugfixes and one cleanup that 
> were performed during prototyping of McASP operation in codec clock-
> master frame-slave mode.
> First we noticed that the check of the number of tdm slots requested
> by platform data was always returning true -- unrelated to CMB/CFS
> mode.
> Then a cleanup: the PDIR values set are currently based on magic 
> numbers and there are  available bitfield definitions. Not strictly
> needed but it makes the changes introduced in the last patch simpler
> to read.
> It was found that the hardware parameters assigned when 
> codec clock-master frame-slave is requested were incorrect. This
> change is required for correct CBM/CFS operation.
> Finally, the direction of the pins is corrected to reflect the
> implications of codec clock-master frame-slave -- i.e. mcasp clock-
> input frame-output. This change is also required for correct operation.
> The combination was tested with a logic analyzer and the hrtimer pwm
> device from Bill Gatliff's PWM framework [1] on a da850evm with
> hardware modifications to access the McASP lines.
> [1] http://article.gmane.org/gmane.linux.kernel.embedded/3486/
> Ben Gardiner (4):
>   davinci-mcasp: correct tdm_slots limit
>   davinci-mcasp: use bitfield definitions for PDIR
>   davinci-mcasp: fix _CBM_CFS hw_params
>   davinci-mcasp: fix _CBM_CFS pin directions
>  sound/soc/davinci/davinci-mcasp.c |   19 ++++++++++++-------
>  1 files changed, 12 insertions(+), 7 deletions(-)


Acked-by: Liam Girdwood <lrg at ti.com>

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