ALSA: hda: Rename back to dmic_detect option

We've got quite a few bug reports showing the SOF driver being loaded
unintentionally recently, and the reason seems to be that users didn't
know the module option change: with the recent kernel, a new option
dsp_driver=1 has to be passed to a new module snd-intel-dspcfg
instead of snd_hda_intel.dmic_detect=0 option.

That is, actually there are two tricky things here:
- We changed the whole detection in another module and another
  option semantics.
- The existing option for skipping the DSP probe was also renamed.

For avoiding the confusion and giving user more hint, this patch
reverts the renamed option dsp_driver back to dmic_detect for
snd-hda-intel module, and show the warning about the module option
change when the non-default value is passed.

Fixes: 82d9d54a ("ALSA: hda: add Intel DSP configuration / probe code")
Link: https://lore.kernel.org/r/20200109082000.26729-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_intel.c

@@ -125,7 +125,7 @@ static char *patch[SNDRV_CARDS];
 static bool beep_mode[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] =
 					CONFIG_SND_HDA_INPUT_BEEP_MODE};
 #endif
-static bool dsp_driver = 1;
+static bool dmic_detect = 1;
 
 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for Intel HD audio interface.");
@@ -160,9 +160,10 @@ module_param_array(beep_mode, bool, NULL, 0444);
 MODULE_PARM_DESC(beep_mode, "Select HDA Beep registration mode "
 			    "(0=off, 1=on) (default=1).");
 #endif
-module_param(dsp_driver, bool, 0444);
-MODULE_PARM_DESC(dsp_driver, "Allow DSP driver selection (bypass this driver) "
-			     "(0=off, 1=on) (default=1)");
+module_param(dmic_detect, bool, 0444);
+MODULE_PARM_DESC(dmic_detect, "Allow DSP driver selection (bypass this driver) "
+			     "(0=off, 1=on) (default=1); "
+		 "deprecated, use snd-intel-dspcfg.dsp_driver option instead");
 
 #ifdef CONFIG_PM
 static int param_set_xint(const char *val, const struct kernel_param *kp);
@@ -2099,11 +2100,13 @@ static int azx_probe(struct pci_dev *pci,
 	/*
 	 * stop probe if another Intel's DSP driver should be activated
 	 */
-	if (dsp_driver) {
+	if (dmic_detect) {
 		err = snd_intel_dsp_driver_probe(pci);
 		if (err != SND_INTEL_DSP_DRIVER_ANY &&
 		    err != SND_INTEL_DSP_DRIVER_LEGACY)
 			return -ENODEV;
+	} else {
+		dev_warn(&pci->dev, "dmic_detect option is deprecated, pass snd-intel-dspcfg.dsp_driver=1 option instead\n");
 	}
 
 	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,