[alsa-devel] [PATCH v2 04/12] ASoC: SOF: Add support for IPC IO between DSP and Host

[Liam Girdwood]

On Mon, 2018-09-03 at 16:53 +0100, Mark Brown wrote:
> On Fri, Aug 31, 2018 at 04:19:02PM +0100, Liam Girdwood wrote:
> 
> > +/* SSP Configuration Request - SOF_IPC_DAI_SSP_CONFIG */
> > +struct sof_ipc_dai_ssp_params {
> > +	/* MCLK */
> > +	uint32_t mclk_direction;
> > +	uint32_t mclk_keep_active;
> > +	uint32_t bclk_keep_active;
> > +	uint32_t fs_keep_active;
> 
> Is this assuming a 1:1 relationship between the serial port and the
> MCLK?  

Yes just for SSP atm.

> That's not going to be true for all systems.  This definition
> does feel a bit specific to the SSP (or I guess just general serial
> ports used for audio as opposed to fixed function I2S/PCM controllers).
> I don't know if it's worth splitting up though.
> 

Yeah, that's the intention is that we have a different structure for each DAI IP
type. We currently have :-

struct sof_ipc_dai_config {
	struct sof_ipc_hdr hdr;
	enum sof_ipc_dai_type type;

	...

	union {
		struct dai_type_X;
		struct dai_type_Y;
	};
};

So we can add future DAI IPs as part of this union alongside a new type ID.

> > +	uint16_t frame_pulse_width;
> > +	uint32_t quirks; // FIXME: is 32 bits enough ?
> 
> Better go for 640K to be sure :) ...

Yep, you never know :)

> 
> > +/* HDA Configuration Request - SOF_IPC_DAI_HDA_CONFIG */
> > +struct sof_ipc_dai_hda_params {
> > +	struct sof_ipc_hdr hdr;
> > +	/* TODO */
> > +} __attribute__((packed));
> 
> ...more seriously I do notice a bunch of these FIXME and TODO comments
> in here, given that it's an ABI it seems like those all need sorting
> before things are merged.  In this case perhaps just delete the HDA
> stuff until someone works out what to do?

Will do. 

Liam