[alsa-devel] writing an alsa driver

[Vinod Koul]

On Wed, Jun 17, 2015 at 11:34:10PM +0200, Michele Curti wrote:
> On Wed, Jun 17, 2015 at 10:16:15AM +0100, Liam Girdwood wrote:
> > On Tue, 2015-06-16 at 22:50 +0200, Michele Curti wrote:
> > > On Mon, Jun 15, 2015 at 06:04:28PM +0100, Liam Girdwood wrote:
> > > > 
> > > > We are also a little suspicious that this laptop is using SSP1 for the
> > > > I2S audio connection to the codec. The bad news is that the FW used by
> > > > this BYT ADSP driver does not support the SSP1 port. It's hard coded to
> > > > use SSP0 (Jarrko, please correct the port numbering if it's wrong).
> > > > There are going to be no further releases of this FW.
> > > > 
> > > > However, the other upstream BYT ADSP driver from Vinod's team is going
> > > > to support the other SSP ports. It currently only supports SSP0, but I
> > > > believe that a new FW will be released soon that will support SSP1.
> > > > Vinod do you know the new FW release date ?
> > > > 
> > > > Michele, can you change your machine driver to use the Vinods BYT DSP
> > > > PCM driver (base it on bytcr_rt5640.c). Please test probing/booting with
> > > > the current FW release from Vinod too. That way you should be ready to
> > > > integrate the new FW when it is released. Please also CC Vinod on any
> > > > issues you have getting the FW to boot using the new driver/FW.
> > > >
> > > 
> > > Sure!
> > > 
> > > A note, without enabling the config option SND_SOC_INTEL_SST the driver
> > > will not compile/install but it seems strange because when doing a 
> > > menuconfig the machine driver option is available even if the 
> > > SND_SOC_INTEL_SST option is not selcted (I copied the Kconfig part 
> > > from the SND_SOC_INTEL_BYTCR_RT5640_MACH one).
Only selecting the SND_SOC_INTEL_BYTCR_RT5640_MACH should do, rest is auto
selected

> > 
> > Is the BYTCR_RT5640 building for you ? This driver family uses the
> > SND_SST_MFLD_PLATFORM instead of the SND_SOC_INTEL_SST platform.
> 
> Mmmh.. indeed no.. I tried with a clean linux-next, doing a make clean and
> selecting the SND_SOC_INTEL_BYTCR_RT5640_MACH option using menuconfig:
> 
> [zio at asus linux-next]$ grep BYTCR_RT5640 .config
> CONFIG_SND_SOC_INTEL_BYTCR_RT5640_MACH=m
> [zio at asus linux-next]$ grep SND_SST_MFLD_PLATFORM .config
> CONFIG_SND_SST_MFLD_PLATFORM=m
> [zio at asus linux-next]$ 
> 
> But when I do a make the driver don't compile
> 
> [zio at asus linux-next]$ ls sound/soc/intel/boards/*.o
> ls: cannot access sound/soc/intel/boards/*.o: No such file or directory
> 
> And when I do a make install the only (sound) installed modules are
> 
>   INSTALL sound/core/snd-compress.ko
>   INSTALL sound/core/snd-pcm.ko
>   INSTALL sound/core/snd-timer.ko
>   INSTALL sound/core/snd.ko
>   INSTALL sound/soc/codecs/snd-soc-rl6231.ko
>   INSTALL sound/soc/codecs/snd-soc-rt5640.ko
>   INSTALL sound/soc/intel/atom/snd-soc-sst-mfld-platform.ko
>   INSTALL sound/soc/intel/atom/sst/snd-intel-sst-acpi.ko
>   INSTALL sound/soc/intel/atom/sst/snd-intel-sst-core.ko
>   INSTALL sound/soc/snd-soc-core.ko
>   INSTALL sound/soundcore.ko
>   DEPMOD  4.1.0-rc8-next-20150617-asus
I am using Marks next

$ grep BYTCR_RT5640 .config
CONFIG_SND_SOC_INTEL_BYTCR_RT5640_MACH=m
$ grep SND_SST_MFLD_PLATFORM .config
CONFIG_SND_SST_MFLD_PLATFORM=m
$ ls sound/soc/intel/boards/*.o
sound/soc/intel/boards/built-in.o      sound/soc/intel/boards/skl_rt286.o
sound/soc/intel/boards/snd-soc-sst-bytcr-rt5640.o
sound/soc/intel/boards/bytcr_rt5640.o
sound/soc/intel/boards/snd-soc-skl_rt286.o

So these did get built for me

-- 
~Vinod