On Sat, Sep 19, 2015 at 10:54:51AM -0700, Mark Brown wrote: > On Fri, Sep 18, 2015 at 02:06:40PM +0300, Jyri Sarha wrote: > > +#define SPDIF_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\ > > + SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\ > > + SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\ > > + SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE) > > + > > +#define I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\ > > + SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE |\ > > + SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\ > > + SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\ > > + SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |\ > > + SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE) > > I'm not sure how abstracted this I2S and S/PDIF DAI business is - it > doesn't feel like something that's going to be a property of all HDMI > devices, and the specific sets of formats above cause me to raise a bit > of an eyebrow. Should this be an interface where the HDMI chip > registers multiple interfaces if it has them instead of automatically > getting this split as is? The inclusion of the 32-bit formats does raise an eyebrow here too. Audio transmission across the HDMI link is S/PDIF, supporting up to 24-bit uncompressed audio (aka L-PCM). The device may accept 32 bit I2S, but it would have to be truncated to 24 bit before transmitting it to the sink. This should be mentioned somewhere. -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
