[PATCH 6.7 047/162] ASoC: cs35l56: Must clear HALO_STATE before issuing SYSTEM_RESET

Greg Kroah-Hartman
2024-03-04T21:27:54Z

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

[ Upstream commit e33625c84b75e4f078d7f9bf58f01fe71ab99642 ]

The driver must write 0 to HALO_STATE before sending the SYSTEM_RESET
command to the firmware.

HALO_STATE is in DSP memory, which is preserved across a soft reset.
The SYSTEM_RESET command does not change the value of HALO_STATE.
There is period of time while the CS35L56 is resetting, before the
firmware has started to boot, where a read of HALO_STATE will return
the value it had before the SYSTEM_RESET. If the driver does not
clear HALO_STATE, this would return BOOT_DONE status even though the
firmware has not booted.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 8a731fd37f8b ("ASoC: cs35l56: Move utility functions to shared file")
Link: https://msgid.link/r/20240216140535.1434933-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/codecs/cs35l56-shared.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/cs35l56-shared.c b/sound/soc/codecs/cs35l56-shared.c
index 953ba066bab1e..fc99bc92aeace 100644
--- a/sound/soc/codecs/cs35l56-shared.c
+++ b/sound/soc/codecs/cs35l56-shared.c
@@ -286,6 +286,7 @@ void cs35l56_wait_min_reset_pulse(void)
EXPORT_SYMBOL_NS_GPL(cs35l56_wait_min_reset_pulse, SND_SOC_CS35L56_SHARED);

static const struct reg_sequence cs35l56_system_reset_seq[] = {
+ REG_SEQ0(CS35L56_DSP1_HALO_STATE, 0),
REG_SEQ0(CS35L56_DSP_VIRTUAL1_MBOX_1, CS35L56_MBOX_CMD_SYSTEM_RESET),
};

--
2.43.0