[alsa-devel] Embedded I2S / 192khz
Is anyone aware of a Linux/ALSA capable chip that can drive 192khz I2S? I poked through the ASoC code and could only see 96khz capability.
Thanks, -Andrew
On Thu, May 08, 2008 at 09:50:32AM -0400, Andrew Paprocki wrote:
Is anyone aware of a Linux/ALSA capable chip that can drive 192khz I2S? I poked through the ASoC code and could only see 96khz capability.
The PowerPC code in sound/soc/fsl (as of 2.6.25) supports up to 192kHz, though it appears to require the codec to clock the bus. The SuperH and Alchemy code in:
git://opensource.wolfsonmicro.com/linux-2.6-asoc
says they support up to 192kHz too. PXA3xx should support this too when it's done.
On Thu, 2008-05-08 at 15:08 +0100, Mark Brown wrote:
On Thu, May 08, 2008 at 09:50:32AM -0400, Andrew Paprocki wrote:
Is anyone aware of a Linux/ALSA capable chip that can drive 192khz I2S? I poked through the ASoC code and could only see 96khz capability.
The PowerPC code in sound/soc/fsl (as of 2.6.25) supports up to 192kHz, though it appears to require the codec to clock the bus. The SuperH and Alchemy code in:
git://opensource.wolfsonmicro.com/linux-2.6-asoc
says they support up to 192kHz too. PXA3xx should support this too when it's done.
heh, shows how much attention I've been paying lately to commits.
PX2xx (SSP) and i.MX3x (SSI) should also do 192kHz too. Interestingly pxa2xx I2S almost manages (datasheet max is 48kHz) 192kHz but underruns a bit!
Has anyone heard of this BridgeCo DM850 chip? It seems powerful, but I'm not sure if there is any ALSA support from the company.. from the datasheet:
"There are up to four Audio I/O ports, each with four I2S/I8S interfaces operating at up to 192 kHz in both I2S and I8S modes.
There are up to eight SPDIF interfaces operating at up to 192 kHz."
http://www.bridgeco.com/pdfs/850/adp_dm850_02_pma_chip-overv.pdf
-Andrew
On Thu, May 8, 2008 at 10:22 AM, Liam Girdwood lg@opensource.wolfsonmicro.com wrote:
On Thu, 2008-05-08 at 15:08 +0100, Mark Brown wrote:
On Thu, May 08, 2008 at 09:50:32AM -0400, Andrew Paprocki wrote:
Is anyone aware of a Linux/ALSA capable chip that can drive 192khz I2S? I poked through the ASoC code and could only see 96khz capability.
The PowerPC code in sound/soc/fsl (as of 2.6.25) supports up to 192kHz, though it appears to require the codec to clock the bus. The SuperH and Alchemy code in:
git://opensource.wolfsonmicro.com/linux-2.6-asoc
says they support up to 192kHz too. PXA3xx should support this too when it's done.
heh, shows how much attention I've been paying lately to commits.
PX2xx (SSP) and i.MX3x (SSI) should also do 192kHz too. Interestingly pxa2xx I2S almost manages (datasheet max is 48kHz) 192kHz but underruns a bit!
On Sat, 2008-05-10 at 14:15 -0400, Andrew Paprocki wrote:
Has anyone heard of this BridgeCo DM850 chip? It seems powerful, but I'm not sure if there is any ALSA support from the company.. from the datasheet:
afaik, no. Do you know if there is Linux support for this chip ?
"There are up to four Audio I/O ports, each with four I2S/I8S interfaces operating at up to 192 kHz in both I2S and I8S modes.
There are up to eight SPDIF interfaces operating at up to 192 kHz."
http://www.bridgeco.com/pdfs/850/adp_dm850_02_pma_chip-overv.pdf
Looks nice for STB applications.
Liam
Mark Brown wrote:
The PowerPC code in sound/soc/fsl (as of 2.6.25) supports up to 192kHz, though it appears to require the codec to clock the bus.
That's only because the reference board I based the code on uses the codec as the clock master. If someone wants to make a board with an 8610 as the clock master, I'd be happy to update the driver to support that.
On Thu, 2008-05-08 at 09:50 -0400, Andrew Paprocki wrote:
Is anyone aware of a Linux/ALSA capable chip that can drive 192khz I2S?
Quite a few codecs can run at 192kHz, although I'm not aware of many SoC CPU's that will support 192kHz I2S. Your best bet is using a SoC CPU with a multi-function port (that also does I2S) as they tend to support faster transfer rates (e.g. SSP on pxa, SSI on i.MX).
I poked through the ASoC code and could only see 96khz capability.
I guess 192kHz is missing from ASoC atm because there is no supported codec hardware that needs it. Trivial to add.
Liam
participants (4)
-
Andrew Paprocki -
Liam Girdwood -
Mark Brown -
Timur Tabi