Hi sugar,
   Can the rockchip support more than 8 channels?  Ideally, we would like to capture 16 channels and playback 16 channels simultaneously.  

Thanks,  Caleb 

Sent from my iPhone

On Oct 7, 2015, at 1:01 AM, sugar [off-list ref] wrote:

Sorry for late reply, we were in the National Day Holiday.

quoted

? 10/1/2015 02:46, Mark Brown ??:

quoted

On Mon, Sep 28, 2015 at 04:16:12PM +0800, sugar wrote:
? 9/24/2015 00:24, Mark Brown ??:

quoted

quoted

My initial thought here is that the machine driver should be responsible
for setting this and then the DAI driver should check to see if
symmetric_rates are in use and configure itself appropriately.  Is there
a reason why this won't work here?

quoted

It's for i2s ip configuration, in the most situation, there is no need
to use this property, except one case:

quoted

In order to save gpio pins for other function use, we may use single
lrck(tx or rx) pin. of course, it depends on product design. when in i2s
slave mode, we need to configure this to share lrck with tx/rx inside i2s
logic.

quoted

symmetric_rates flag works fine on rockchip platform, but it can't cover the
above case.

quoted

Do you have any suggestion about this or maybe there is no need to upstream
this special part?

What makes you say that the symmetric_rates flag can't be used to cover
this case?  What you describe above is hte normal reason for needing to
enforce symmetric_rates.  The driver should be able to check if the flag
has been set just as well as the core is.

Got it, How about the following modify?

if (dai->symmetric_rates)
   regmap_update_bits(i2s->regmap, I2S_CKR,
                          I2S_CKR_TRCM_MASK,
                          I2S_CKR_TRCM(val));


_______________________________________________
Alsa-devel mailing list
Alsa-devel at alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel