ASoC: SOF: Intel: add codec_mask module parameter

Add a module parameter 'codec_mask' to filter out unwanted
HDA codecs from driver probe. E.g. on most systems,
codec_mask=4 will limit to HDMI audio and exclude any
external HDA codecs.

Similar to 'probe_mask' module parameter of snd-hda-intel.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191210004854.16845-6-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/hda-ctrl.c

@@ -15,11 +15,18 @@
  * Hardware interface for generic Intel audio DSP HDA IP
  */
 
+#include <linux/module.h>
 #include <sound/hdaudio_ext.h>
 #include <sound/hda_register.h>
 #include "../ops.h"
 #include "hda.h"
 
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
+static int hda_codec_mask = -1;
+module_param_named(codec_mask, hda_codec_mask, int, 0444);
+MODULE_PARM_DESC(codec_mask, "SOF HDA codec mask for probing");
+#endif
+
 /*
  * HDA Operations.
  */
@@ -206,6 +213,12 @@ int hda_dsp_ctrl_init_chip(struct snd_sof_dev *sdev, bool full_reset)
 		bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS);
 		dev_dbg(bus->dev, "codec_mask = 0x%lx\n", bus->codec_mask);
 	}
+
+	if (hda_codec_mask != -1) {
+		bus->codec_mask &= hda_codec_mask;
+		dev_dbg(bus->dev, "filtered codec_mask = 0x%lx\n",
+			bus->codec_mask);
+	}
 #endif
 
 	/* clear stream status */