ASoC: cs42l42: Add SOFT_RESET_REBOOT register

The SOFT_RESET_REBOOT register is needed to recover CS42L42 state after
a Soundwire bus reset.

This is required to be set whenever there is severe/hard bus reset.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230127165111.3010960-3-sbinding@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/cs42l42.h b/include/sound/cs42l42.h
index 1d1c24f..3994e93 100644 (file)
--- 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/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 2fefbcf..82aa11d 100644 (file)
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -293,6 +293,7 @@ bool cs42l42_readable_register(struct device *dev, unsigned int reg)
        case CS42L42_SPDIF_SW_CTL1:
        case CS42L42_SRC_SDIN_FS:
        case CS42L42_SRC_SDOUT_FS:
+       case CS42L42_SOFT_RESET_REBOOT:
        case CS42L42_SPDIF_CTL1:
        case CS42L42_SPDIF_CTL2:
        case CS42L42_SPDIF_CTL3:
@@ -358,6 +359,7 @@ bool cs42l42_volatile_register(struct device *dev, unsigned int reg)
        case CS42L42_LOAD_DET_DONE:
        case CS42L42_DET_STATUS1:
        case CS42L42_DET_STATUS2:
+       case CS42L42_SOFT_RESET_REBOOT:
                return true;
        default:
                return false;