ASoC: SOF: Intel: override mclk_id for ES8336 support

Merge series from Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>:

This patchset solves a known issue with ES8336 platforms wrt MCLK
selection. Most of the devices use the MCLK0 signal, but some devices
do use the MCLK1 signal.

The MCLK is defined in the topology, it would be a nightmare to
generate more topology files just for one MCLK difference. With a
minor extension to the intel-nhlt library, the MCLK information can be
found by parsing the NHLT table, and we can override the mclk_id at
boot time.

The only known issues for this platform remain the detection of GPIO
and microphone connections, currently only possible with manual
quirks.

Thanks to Eugene J. Markow for testing this patchset.

1 files changed, 79 insertions, 0 deletions

diff --git a/sound/hda/intel-nhlt.c b/sound/hda/intel-nhlt.c
index 13bb0ccfb36c..2c4dfc0b7e34 100644
--- a/sound/hda/intel-nhlt.c
+++ b/sound/hda/intel-nhlt.c
@@ -157,6 +157,85 @@ int intel_nhlt_ssp_endpoint_mask(struct nhlt_acpi_table *nhlt, u8 device_type)
 }
 EXPORT_SYMBOL(intel_nhlt_ssp_endpoint_mask);
 
+#define SSP_BLOB_V1_0_SIZE		84
+#define SSP_BLOB_V1_0_MDIVC_OFFSET	19 /* offset in u32 */
+
+#define SSP_BLOB_V1_5_SIZE		96
+#define SSP_BLOB_V1_5_MDIVC_OFFSET	21 /* offset in u32 */
+#define SSP_BLOB_VER_1_5		0xEE000105
+
+#define SSP_BLOB_V2_0_SIZE		88
+#define SSP_BLOB_V2_0_MDIVC_OFFSET	20 /* offset in u32 */
+#define SSP_BLOB_VER_2_0		0xEE000200
+
+int intel_nhlt_ssp_mclk_mask(struct nhlt_acpi_table *nhlt, int ssp_num)
+{
+	struct nhlt_endpoint *epnt;
+	struct nhlt_fmt *fmt;
+	struct nhlt_fmt_cfg *cfg;
+	int mclk_mask = 0;
+	int i, j;
+
+	if (!nhlt)
+		return 0;
+
+	epnt = (struct nhlt_endpoint *)nhlt->desc;
+	for (i = 0; i < nhlt->endpoint_count; i++) {
+
+		/* we only care about endpoints connected to an audio codec over SSP */
+		if (epnt->linktype == NHLT_LINK_SSP &&
+		    epnt->device_type == NHLT_DEVICE_I2S &&
+		    epnt->virtual_bus_id == ssp_num) {
+
+			fmt = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
+			cfg = fmt->fmt_config;
+
+			/*
+			 * In theory all formats should use the same MCLK but it doesn't hurt to
+			 * double-check that the configuration is consistent
+			 */
+			for (j = 0; j < fmt->fmt_count; j++) {
+				u32 *blob;
+				int mdivc_offset;
+				int size;
+
+				/* first check we have enough data to read the blob type */
+				if (cfg->config.size < 8)
+					return -EINVAL;
+
+				blob = (u32 *)cfg->config.caps;
+
+				if (blob[1] == SSP_BLOB_VER_2_0) {
+					mdivc_offset = SSP_BLOB_V2_0_MDIVC_OFFSET;
+					size = SSP_BLOB_V2_0_SIZE;
+				} else if (blob[1] == SSP_BLOB_VER_1_5) {
+					mdivc_offset = SSP_BLOB_V1_5_MDIVC_OFFSET;
+					size = SSP_BLOB_V1_5_SIZE;
+				} else {
+					mdivc_offset = SSP_BLOB_V1_0_MDIVC_OFFSET;
+					size = SSP_BLOB_V1_0_SIZE;
+				}
+
+				/* make sure we have enough data for the fixed part of the blob */
+				if (cfg->config.size < size)
+					return -EINVAL;
+
+				mclk_mask |=  blob[mdivc_offset] & GENMASK(1, 0);
+
+				cfg = (struct nhlt_fmt_cfg *)(cfg->config.caps + cfg->config.size);
+			}
+		}
+		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
+	}
+
+	/* make sure only one MCLK is used */
+	if (hweight_long(mclk_mask) != 1)
+		return -EINVAL;
+
+	return mclk_mask;
+}
+EXPORT_SYMBOL(intel_nhlt_ssp_mclk_mask);
+
 static struct nhlt_specific_cfg *
 nhlt_get_specific_cfg(struct device *dev, struct nhlt_fmt *fmt, u8 num_ch,
 		      u32 rate, u8 vbps, u8 bps)