linux-kernel - Re: [GIT PULL] sound updates for 4.21

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Date:   Mon, 31 Dec 2018 09:11:19 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Takashi Iwai <tiwai@...e.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] sound updates for 4.21

On Mon, 31 Dec 2018 00:17:58 +0100,
Pierre-Louis Bossart wrote:
> 
> > BTW, one thing I'd really like to avoid is to rearrange the probe
> > procedure of the legacy HDA driver (so that we can get codec_mask
> > during pci probe() call).  The async probe is the result of the many
> > struggles with the various and complex configurations.   Moving the
> > codec probe to the beginning isn't trivial and quite risky to break
> > something else.
> Agree, mucking with the probe isn't something we should look into,
> especially with this Skylake driver being eventually deprecated once
> SOF is at feature parity. This set of autodetection patches for 4.21
> was really targeting CFL/WHL+ devices, where the DSP usage is
> mandatory when directly-attached digital microphones are used. For
> Skylake and kabylake using the legacy by default is just fine.

OK, then how about applying the PCI class check only for such ones
like the patch below?  The macro isn't sexy and can be replaced with
another way, but you have an idea.


thanks,

Takashi

--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -380,6 +380,13 @@ enum {
 #define IS_BXT(pci) ((pci)->vendor == 0x8086 && (pci)->device == 0x5a98)
 #define IS_CFL(pci) ((pci)->vendor == 0x8086 && (pci)->device == 0xa348)
 
+/* CFL and later models, preferring ASoC when DSP is available */
+#define IS_CFL_PLUS(pci)	     \
+	((pci)->vendor == 0x8086 &&  \
+	 ((pci)->device == 0xa348 || \
+	  (pci)->device == 0x9dc8 || \
+	  (pci)->device == 0x34c8))
+
 static char *driver_short_names[] = {
 	[AZX_DRIVER_ICH] = "HDA Intel",
 	[AZX_DRIVER_PCH] = "HDA Intel PCH",
@@ -2056,7 +2063,7 @@ static int azx_probe(struct pci_dev *pci,
 	if (pci_id->driver_data & AZX_DCAPS_INTEL_SHARED) {
 		switch (skl_pci_binding) {
 		case SND_SKL_PCI_BIND_AUTO:
-			if (pci->class != 0x040300) {
+			if (pci->class != 0x040300 && IS_CFL_PLUS(pci)) {
 				dev_info(&pci->dev, "The DSP is enabled on this platform, aborting probe\n");
 				return -ENODEV;
 			}