ASoC: SOF: Intel: add dev_dbg log when driver is not selected

Mirror change suggested in legacy HDaudio driver.

On SKL+ Intel platforms, the driver selection is handled by the
snd_intel_dspcfg, and when the HDaudio legacy driver is not selected,
be it with the auto-selection or user preferences with a kernel
parameter, the probe aborts with no logs, only a -ENODEV return value.

Having no dmesg trace, even with dynamic debug enabled, makes support
more complicated than it needs to be, and even experienced users can
be fooled. A simple dev_dbg() trace solves this problem.

BugLink: https://github.com/thesofproject/linux/issues/2330Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200824200912.46852-8-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/sof-pci-dev.c

@@ -302,10 +302,10 @@ static int sof_pci_probe(struct pci_dev *pci,
 	int ret;
 
 	ret = snd_intel_dsp_driver_probe(pci);
-	if (ret != SND_INTEL_DSP_DRIVER_ANY &&
-	    ret != SND_INTEL_DSP_DRIVER_SOF)
+	if (ret != SND_INTEL_DSP_DRIVER_ANY && ret != SND_INTEL_DSP_DRIVER_SOF) {
+		dev_dbg(&pci->dev, "SOF PCI driver not selected, aborting probe\n");
 		return -ENODEV;
-
+	}
 	dev_dbg(&pci->dev, "PCI DSP detected");
 
 	/* get ops for platform */