[alsa-devel] [PATCH v3 3/7] ASoC: Intel: Skylake: Add extended I2S config blob support in Clock driver

[Sriram Periyasamy]

Extended I2S config blob supports multiple mclk dividers in NHLT blob.
This patch detects whether the I2S blob is legacy or extended based on the
signature value and chooses the mclk source and divider accordingly.

Signed-off-by: Sriram Periyasamy <sriramx.periyasamy at intel.com>
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty at intel.com>
---
 sound/soc/intel/skylake/skl-i2s.h  | 31 ++++++++++++++++++++++++++++
 sound/soc/intel/skylake/skl-nhlt.c | 41 +++++++++++++++++++++++++++-----------
 2 files changed, 60 insertions(+), 12 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-i2s.h b/sound/soc/intel/skylake/skl-i2s.h
index dcf819b..ad0a1bb 100644
--- a/sound/soc/intel/skylake/skl-i2s.h
+++ b/sound/soc/intel/skylake/skl-i2s.h
@@ -27,6 +27,12 @@
 #define SKL_SHIFT(x)			(ffs(x) - 1)
 #define SKL_MCLK_DIV_RATIO_MASK		GENMASK(11, 0)
 
+#define is_legacy_blob(x) (x.signature != 0xEE)
+#define ext_to_legacy_blob(i2s_config_blob_ext) \
+	((struct skl_i2s_config_blob_legacy *) i2s_config_blob_ext)
+
+#define get_clk_src(mclk, mask) \
+		((mclk.mdivctrl & mask) >> SKL_SHIFT(mask))
 struct skl_i2s_config {
 	u32 ssc0;
 	u32 ssc1;
@@ -45,6 +51,24 @@ struct skl_i2s_config_mclk {
 	u32 mdivr;
 };
 
+struct skl_i2s_config_mclk_ext {
+	u32 mdivctrl;
+	u32 mdivr_count;
+	u32 mdivr[0];
+} __packed;
+
+struct skl_i2s_config_blob_signature {
+	u32 minor_ver : 8;
+	u32 major_ver : 8;
+	u32 resvdz : 8;
+	u32 signature : 8;
+} __packed;
+
+struct skl_i2s_config_blob_header {
+	struct skl_i2s_config_blob_signature sig;
+	u32 size;
+};
+
 /**
  * struct skl_i2s_config_blob_legacy - Structure defines I2S Gateway
  * configuration legacy blob
@@ -61,4 +85,11 @@ struct skl_i2s_config_blob_legacy {
 	struct skl_i2s_config_mclk mclk;
 };
 
+struct skl_i2s_config_blob_ext {
+	u32 gtw_attr;
+	struct skl_i2s_config_blob_header hdr;
+	u32 tdm_ts_group[SKL_I2S_MAX_TIME_SLOTS];
+	struct skl_i2s_config i2s_cfg;
+	struct skl_i2s_config_mclk_ext mclk;
+} __packed;
 #endif /* __SOUND_SOC_SKL_I2S_H */
diff --git a/sound/soc/intel/skylake/skl-nhlt.c b/sound/soc/intel/skylake/skl-nhlt.c
index 4d2136c..c2dcce9 100644
--- a/sound/soc/intel/skylake/skl-nhlt.c
+++ b/sound/soc/intel/skylake/skl-nhlt.c
@@ -26,6 +26,7 @@ static guid_t osc_guid =
 	GUID_INIT(0xA69F886E, 0x6CEB, 0x4594,
 		  0xA4, 0x1F, 0x7B, 0x5D, 0xCE, 0x24, 0xC5, 0x53);
 
+
 struct nhlt_acpi_table *skl_nhlt_init(struct device *dev)
 {
 	acpi_handle handle;
@@ -272,6 +273,7 @@ void skl_nhlt_remove_sysfs(struct skl *skl)
 void skl_get_ssp_clks(struct skl *skl, struct skl_ssp_clk *ssp_clks,
 				struct nhlt_fmt *fmt, u8 id)
 {
+	struct skl_i2s_config_blob_ext *i2s_config_ext;
 	struct skl_i2s_config_blob_legacy *i2s_config;
 	struct skl_clk_parent_src *parent;
 	struct skl_ssp_clk *sclk, *sclkfs;
@@ -332,12 +334,18 @@ void skl_get_ssp_clks(struct skl *skl, struct skl_ssp_clk *ssp_clks,
 
 		/* Fill rate and parent for sclk/sclkfs */
 		if (!present) {
-			/* MCLK Divider Source Select */
-			i2s_config = (struct skl_i2s_config_blob_legacy *)
+			i2s_config_ext = (struct skl_i2s_config_blob_ext *)
 						fmt->fmt_config[0].config.caps;
-			clk_src = ((i2s_config->mclk.mdivctrl)
-					& SKL_MNDSS_DIV_CLK_SRC_MASK) >>
-					SKL_SHIFT(SKL_MNDSS_DIV_CLK_SRC_MASK);
+
+			/* MCLK Divider Source Select */
+			if (is_legacy_blob(i2s_config_ext->hdr.sig)) {
+				i2s_config = ext_to_legacy_blob(i2s_config_ext);
+				clk_src = get_clk_src(i2s_config->mclk,
+						SKL_MNDSS_DIV_CLK_SRC_MASK);
+			} else {
+				clk_src = get_clk_src(i2s_config_ext->mclk,
+						SKL_MNDSS_DIV_CLK_SRC_MASK);
+			}
 
 			parent = skl_get_parent_clk(clk_src);
 
@@ -363,6 +371,7 @@ void skl_get_ssp_clks(struct skl *skl, struct skl_ssp_clk *ssp_clks,
 void skl_get_mclk(struct skl *skl, struct skl_ssp_clk *mclk,
 				struct nhlt_fmt *fmt, u8 id)
 {
+	struct skl_i2s_config_blob_ext *i2s_config_ext;
 	struct skl_i2s_config_blob_legacy *i2s_config;
 	struct nhlt_specific_cfg *fmt_cfg;
 	struct skl_clk_parent_src *parent;
@@ -370,13 +379,21 @@ void skl_get_mclk(struct skl *skl, struct skl_ssp_clk *mclk,
 	u8 clk_src;
 
 	fmt_cfg = &fmt->fmt_config[0].config;
-	i2s_config = (struct skl_i2s_config_blob_legacy *)fmt_cfg->caps;
-
-	/* MCLK Divider Source Select */
-	clk_src = ((i2s_config->mclk.mdivctrl) & SKL_MCLK_DIV_CLK_SRC_MASK) >>
-					SKL_SHIFT(SKL_MCLK_DIV_CLK_SRC_MASK);
-
-	clkdiv = i2s_config->mclk.mdivr & SKL_MCLK_DIV_RATIO_MASK;
+	i2s_config_ext = (struct skl_i2s_config_blob_ext *)fmt_cfg->caps;
+
+	/* MCLK Divider Source Select and divider */
+	if (is_legacy_blob(i2s_config_ext->hdr.sig)) {
+		i2s_config = ext_to_legacy_blob(i2s_config_ext);
+		clk_src = get_clk_src(i2s_config->mclk,
+				SKL_MCLK_DIV_CLK_SRC_MASK);
+		clkdiv = i2s_config->mclk.mdivr &
+				SKL_MCLK_DIV_RATIO_MASK;
+	} else {
+		clk_src = get_clk_src(i2s_config_ext->mclk,
+				SKL_MCLK_DIV_CLK_SRC_MASK);
+		clkdiv = i2s_config_ext->mclk.mdivr[0] &
+				SKL_MCLK_DIV_RATIO_MASK;
+	}
 
 	/* bypass divider */
 	div_ratio = 1;
-- 
2.7.4