ASoC: cs42l42: Add SoundWire support

Merge series from Stefan Binding <sbinding@opensource.cirrus.com>: The CS42L42 has a SoundWire interface for control and audio. This chain of patches adds support for this. Patches thesofproject#1 .. thesofproject#5 split out various changes to the existing code that are needed for adding Soundwire. These are mostly around clocking and supporting the separate probe and enumeration stages in SoundWire. Patches thesofproject#6 .. thesofproject#8 actually adds the SoundWire handling.
ujfalusi · Jan 31, 2023 · 98fda42 · 98fda42
2 parents 6570bef + 16838bf
commit 98fda42
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Showing 8 changed files with 729 additions and 50 deletions.
diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
@@ -469,7 +469,7 @@ static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 	}
 
 	/* Inform slave about the impending port prepare */
-	sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
+	sdw_do_port_prep(s_rt, prep_ch, prep ? SDW_OPS_PORT_PRE_PREP : SDW_OPS_PORT_PRE_DEPREP);
 
 	/* Prepare Slave port implementing CP_SM */
 	if (!dpn_prop->simple_ch_prep_sm) {
@@ -501,7 +501,7 @@ static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 	}
 
 	/* Inform slaves about ports prepared */
-	sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
+	sdw_do_port_prep(s_rt, prep_ch, prep ? SDW_OPS_PORT_POST_PREP : SDW_OPS_PORT_POST_DEPREP);
 
 	/* Disable interrupt after Port de-prepare */
 	if (!prep && intr)

diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
@@ -566,13 +566,15 @@ struct sdw_prepare_ch {
  * enum sdw_port_prep_ops: Prepare operations for Data Port
  *
  * @SDW_OPS_PORT_PRE_PREP: Pre prepare operation for the Port
- * @SDW_OPS_PORT_PREP: Prepare operation for the Port
+ * @SDW_OPS_PORT_PRE_DEPREP: Pre deprepare operation for the Port
  * @SDW_OPS_PORT_POST_PREP: Post prepare operation for the Port
+ * @SDW_OPS_PORT_POST_DEPREP: Post deprepare operation for the Port
  */
 enum sdw_port_prep_ops {
 	SDW_OPS_PORT_PRE_PREP = 0,
-	SDW_OPS_PORT_PREP = 1,
-	SDW_OPS_PORT_POST_PREP = 2,
+	SDW_OPS_PORT_PRE_DEPREP,
+	SDW_OPS_PORT_POST_PREP,
+	SDW_OPS_PORT_POST_DEPREP,
 };
 
 /**

diff --git a/include/sound/cs42l42.h b/include/sound/cs42l42.h
@@ -34,6 +34,7 @@
 #define CS42L42_PAGE_24		0x2400
 #define CS42L42_PAGE_25		0x2500
 #define CS42L42_PAGE_26		0x2600
+#define CS42L42_PAGE_27		0x2700
 #define CS42L42_PAGE_28		0x2800
 #define CS42L42_PAGE_29		0x2900
 #define CS42L42_PAGE_2A		0x2A00
@@ -720,6 +721,10 @@
 
 #define CS42L42_SRC_SDOUT_FS		(CS42L42_PAGE_26 + 0x09)
 
+/* Page 0x27 DMA */
+#define CS42L42_SOFT_RESET_REBOOT	(CS42L42_PAGE_27 + 0x01)
+#define CS42L42_SFT_RST_REBOOT_MASK	BIT(1)
+
 /* Page 0x28 S/PDIF Registers */
 #define CS42L42_SPDIF_CTL1		(CS42L42_PAGE_28 + 0x01)
 #define CS42L42_SPDIF_CTL2		(CS42L42_PAGE_28 + 0x02)

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
@@ -69,6 +69,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_CS35L45_I2C
 	imply SND_SOC_CS35L45_SPI
 	imply SND_SOC_CS42L42
+	imply SND_SOC_CS42L42_SDW
 	imply SND_SOC_CS42L51_I2C
 	imply SND_SOC_CS42L52
 	imply SND_SOC_CS42L56
@@ -722,6 +723,13 @@ config SND_SOC_CS42L42
 	select REGMAP_I2C
 	select SND_SOC_CS42L42_CORE
 
+config SND_SOC_CS42L42_SDW
+	tristate "Cirrus Logic CS42L42 CODEC on Soundwire"
+	depends on SOUNDWIRE
+	select SND_SOC_CS42L42_CORE
+	help
+	  Enable support for Cirrus Logic CS42L42 codec with Soundwire control
+
 config SND_SOC_CS42L51
 	tristate
 

diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
@@ -69,6 +69,7 @@ snd-soc-cs35l45-spi-objs := cs35l45-spi.o
 snd-soc-cs35l45-i2c-objs := cs35l45-i2c.o
 snd-soc-cs42l42-objs := cs42l42.o
 snd-soc-cs42l42-i2c-objs := cs42l42-i2c.o
+snd-soc-cs42l42-sdw-objs := cs42l42-sdw.o
 snd-soc-cs42l51-objs := cs42l51.o
 snd-soc-cs42l51-i2c-objs := cs42l51-i2c.o
 snd-soc-cs42l52-objs := cs42l52.o
@@ -434,6 +435,7 @@ obj-$(CONFIG_SND_SOC_CS35L45_SPI)	+= snd-soc-cs35l45-spi.o
 obj-$(CONFIG_SND_SOC_CS35L45_I2C)	+= snd-soc-cs35l45-i2c.o
 obj-$(CONFIG_SND_SOC_CS42L42_CORE)	+= snd-soc-cs42l42.o
 obj-$(CONFIG_SND_SOC_CS42L42)	+= snd-soc-cs42l42-i2c.o
+obj-$(CONFIG_SND_SOC_CS42L42_SDW)	+= snd-soc-cs42l42-sdw.o
 obj-$(CONFIG_SND_SOC_CS42L51)	+= snd-soc-cs42l51.o
 obj-$(CONFIG_SND_SOC_CS42L51_I2C)	+= snd-soc-cs42l51-i2c.o
 obj-$(CONFIG_SND_SOC_CS42L52)	+= snd-soc-cs42l52.o