linux-kernel - [PATCH v3 2/8] ASoC: cs42l42: Add SOFT_RESET

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Date:   Fri, 27 Jan 2023 16:51:05 +0000
From:   Stefan Binding <sbinding@...nsource.cirrus.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: [PATCH v3 2/8] ASoC: cs42l42: Add SOFT_RESET_REBOOT register

From: Richard Fitzgerald <rf@...nsource.cirrus.com>

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@...nsource.cirrus.com>
Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
---
 include/sound/cs42l42.h    | 5 +++++
 sound/soc/codecs/cs42l42.c | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/include/sound/cs42l42.h b/include/sound/cs42l42.h
index 1d1c24fdd0cae..3994e933db195 100644
--- 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 2fefbcf7bd130..82aa11d6937be 100644
--- 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;
-- 
2.34.1