From: Kai Vehmanen kai.vehmanen@linux.intel.com
As part of the suspend flow, a context save IPC message is sent to the firmware before powering down the DSP. If errors are met, the suspend flow is aborted with current code.
Change the behaviour such that if firmware returns -EBUSY or -EAGAIN, return the error codes to PM core as before. The device is left in active state in this case.
If other errors are reported, print a warning but do not block the suspend flow. As per interface specification, no valid error can be returned in this scenario. If the hardware has hit a fatal error and is not able to respond successfully, best recovery method is to proceed with suspend and power off the DSP.
Signed-off-by: Kai Vehmanen kai.vehmanen@linux.intel.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- sound/soc/sof/pm.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c index 8ef1d51025d8..b7843f02ef67 100644 --- a/sound/soc/sof/pm.c +++ b/sound/soc/sof/pm.c @@ -343,11 +343,20 @@ static int sof_suspend(struct device *dev, bool runtime_suspend) #endif /* notify DSP of upcoming power down */ ret = sof_send_pm_ipc(sdev, SOF_IPC_PM_CTX_SAVE); - if (ret < 0) { + if (ret == -EBUSY || ret == -EAGAIN) { + /* + * runtime PM has logic to handle -EBUSY/-EAGAIN so + * pass these errors up + */ dev_err(sdev->dev, "error: ctx_save ipc error during suspend %d\n", ret); return ret; + } else if (ret < 0) { + /* FW in unexpected state, continue to power down */ + dev_warn(sdev->dev, + "ctx_save ipc error %d, proceeding with suspend\n", + ret); }
/* power down all DSP cores */