[PATCH] ASoC: cs35l56: Must clear HALO_STATE before issuing SYSTEM_RESET
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") --- 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 995d979b6d87..cb4e83126b08 100644 --- a/sound/soc/codecs/cs35l56-shared.c +++ b/sound/soc/codecs/cs35l56-shared.c @@ -335,6 +335,7 @@ 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), };
On Fri, 16 Feb 2024 14:05:35 +0000, Richard Fitzgerald wrote:
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.
[...]
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/1] ASoC: cs35l56: Must clear HALO_STATE before issuing SYSTEM_RESET commit: e33625c84b75e4f078d7f9bf58f01fe71ab99642
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
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Thanks, Mark
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Mark Brown -
Richard Fitzgerald