Re: [EXTERNAL] Re: [PATCH v3 4/5] ALSA: hda/tas2781: Add tas2781 HDA driver

[Takashi Iwai <tiwai@suse.de>]

On Tue, 23 May 2023 13:22:03 +0200,
Ding, Shenghao wrote:
> 
> > +	[ALC287_FIXUP_TAS2781_I2C_2] = {
> > +		.type = HDA_FIXUP_FUNC,
> > +		.v.func = tas2781_fixup_i2c,
> > +		.chained = true,
> > +		.chain_id = ALC269_FIXUP_THINKPAD_ACPI,
> > +	},
> > +	[ALC287_FIXUP_TAS2781_I2C_4] = {
> > +		.type = HDA_FIXUP_FUNC,
> > +		.v.func = tas2781_fixup_i2c,
> > +		.chained = true,
> > +		.chain_id = ALC269_FIXUP_THINKPAD_ACPI,
> > +	},
> 
> What's a difference between *_2 and *_4?
> Combine them into ALC287_FIXUP_TAS2781_I2C

Hm, so there is no difference in stereo and quad speakers?

> > +static int tas2781_save_calibration(struct tasdevice_priv *tas_priv) 
> > +{
> > +	efi_guid_t efi_guid = EFI_GUID(0x02f9af02, 0x7734, 0x4233, 0xb4, 0x3d,
> > +		0x93, 0xfe, 0x5a, 0xa3, 0x5d, 0xb3);
> > +	static efi_char16_t efi_name[] = L"CALI_DATA";
> > +	struct hda_codec *codec = tas_priv->codec;
> > +	unsigned int subid = codec->core.subsystem_id & 0xFFFF;
> > +	struct tm *tm = &tas_priv->tm;
> > +	unsigned int attr, crc;
> > +	unsigned int *tmp_val;
> > +	efi_status_t status;
> > +	int ret = 0;
> > +
> > +	//Lenovo devices
> > +	if ((subid == 0x387d) || (subid == 0x387e) || (subid == 0x3881)
> > +		|| (subid == 0x3884) || (subid == 0x3886) || (subid == 0x38a7)
> > +		|| (subid == 0x38a8) || (subid == 0x38ba) || (subid == 0x38bb)
> > +		|| (subid == 0x38be) || (subid == 0x38bf) || (subid == 0x38c3)
> > +		|| (subid == 0x38cb) || (subid == 0x38cd))
> > +		efi_guid = EFI_GUID(0x1f52d2a1, 0xbb3a, 0x457d, 0xbc, 0x09,
> > +			0x43, 0xa3, 0xf4, 0x31, 0x0a, 0x92);
> 
> Here can be a problem: the device ID is embedded here, and it's hard to find out.  You'd better to make it some quirk flag that is set in a common place and check the flag here instead of checking ID at each place.
> 
> Do you have example of the solution? I found some quirk flag is static in the patch_realtek.c, can't be accessed outside that file.

You may store some values in struct hda_component, I suppose?

BTW, please try to fix your mailer to do citation more correctly...


thanks,

Takashi