ASoC: SOF: Intel: hda: add helper to extract SoundWire link count

The register changed with the HDaudio integration, the information is
present in the extended link descriptor and not in the SHIM.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230602205620.310879-10-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/hda.c

@@ -222,6 +222,31 @@ int hda_sdw_check_lcount_common(struct snd_sof_dev *sdev)
 	return 0;
 }
 
+int hda_sdw_check_lcount_ext(struct snd_sof_dev *sdev)
+{
+	struct sof_intel_hda_dev *hdev;
+	struct sdw_intel_ctx *ctx;
+	struct hdac_bus *bus;
+	u32 slcount;
+
+	bus = sof_to_bus(sdev);
+
+	hdev = sdev->pdata->hw_pdata;
+	ctx = hdev->sdw;
+
+	slcount = hdac_bus_eml_get_count(bus, true, AZX_REG_ML_LEPTR_ID_SDW);
+
+	/* Check HW supported vs property value */
+	if (slcount < ctx->count) {
+		dev_err(sdev->dev,
+			"%s: BIOS master count %d is larger than hardware capabilities %d\n",
+			__func__, ctx->count, slcount);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int hda_sdw_check_lcount(struct snd_sof_dev *sdev)
 {
 	const struct sof_intel_dsp_desc *chip;

sound/soc/sof/intel/hda.h

@@ -781,6 +781,7 @@ int hda_dsp_trace_trigger(struct snd_sof_dev *sdev, int cmd);
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_INTEL_SOUNDWIRE)
 
 int hda_sdw_check_lcount_common(struct snd_sof_dev *sdev);
+int hda_sdw_check_lcount_ext(struct snd_sof_dev *sdev);
 int hda_sdw_startup(struct snd_sof_dev *sdev);
 void hda_common_enable_sdw_irq(struct snd_sof_dev *sdev, bool enable);
 void hda_sdw_int_enable(struct snd_sof_dev *sdev, bool enable);
@@ -794,6 +795,11 @@ static inline int hda_sdw_check_lcount_common(struct snd_sof_dev *sdev)
 	return 0;
 }
 
+static inline int hda_sdw_check_lcount_ext(struct snd_sof_dev *sdev)
+{
+	return 0;
+}
+
 static inline int hda_sdw_startup(struct snd_sof_dev *sdev)
 {
 	return 0;