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 <sugar.zhang at rock-chips.com> wrote: > > Sorry for late reply, we were in the National Day Holiday. > >> ? 10/1/2015 02:46, Mark Brown ??: >>> On Mon, Sep 28, 2015 at 04:16:12PM +0800, sugar wrote: >>> ? 9/24/2015 00:24, Mark Brown ??: >> >>>> 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? >> >>> It's for i2s ip configuration, in the most situation, there is no need >>> to use this property, except one case: >> >>> 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. >> >>> symmetric_rates flag works fine on rockchip platform, but it can't cover the >>> above case. >> >>> 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
