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Jaroslav Kysela
a5fe873dee
JIRA: https://issues.redhat.com/browse/RHEL-183295 commit 73942a6ea26bd7e02b7c260b8b7aa942397be894 Author: Stefan Binding <sbinding@opensource.cirrus.com> Date: Tue Feb 24 16:18:05 2026 +0000 firmware: cs_dsp: Add API to hibernate the DSP For some parts, the DSP is kept running when in low power mode (hibernation), leaving the firmware ALSA controls enabled, but the registers are inaccessible. Attempts to access volatile firmware controls whilst in this state would produce errors in the kernel log due to a regmap_raw_read() into DSP registers whilst the regmap is in cache_only. To remove this error log, add a hibernating flag to indicate that the controls are inaccessible, so we no longer try to read or write to the registers whilst the regmap is in cache_only. This would still produce an error when trying to read or write to these controls, but this would be a different error (-EPERM instead of -EBUSY), and would not produce a spurious error log in the kernel. Upon wake from hibernation, the control caches are re-synced to the hardware, if the DSP is running. Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com> Link: https://patch.msgid.link/20260224161821.93365-2-sbinding@opensource.cirrus.com Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com> Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Jaroslav Kysela <jkysela@redhat.com>