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-rw-r--r--sound/soc/sof/pm.c389
1 files changed, 389 insertions, 0 deletions
diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
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index 0000000000..704b21413c
--- /dev/null
+++ b/sound/soc/sof/pm.c
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+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+//
+// This file is provided under a dual BSD/GPLv2 license. When using or
+// redistributing this file, you may do so under either license.
+//
+// Copyright(c) 2018 Intel Corporation. All rights reserved.
+//
+// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
+//
+
+#include "ops.h"
+#include "sof-priv.h"
+#include "sof-audio.h"
+
+/*
+ * Helper function to determine the target DSP state during
+ * system suspend. This function only cares about the device
+ * D-states. Platform-specific substates, if any, should be
+ * handled by the platform-specific parts.
+ */
+static u32 snd_sof_dsp_power_target(struct snd_sof_dev *sdev)
+{
+ u32 target_dsp_state;
+
+ switch (sdev->system_suspend_target) {
+ case SOF_SUSPEND_S5:
+ case SOF_SUSPEND_S4:
+ /* DSP should be in D3 if the system is suspending to S3+ */
+ case SOF_SUSPEND_S3:
+ /* DSP should be in D3 if the system is suspending to S3 */
+ target_dsp_state = SOF_DSP_PM_D3;
+ break;
+ case SOF_SUSPEND_S0IX:
+ /*
+ * Currently, the only criterion for retaining the DSP in D0
+ * is that there are streams that ignored the suspend trigger.
+ * Additional criteria such Soundwire clock-stop mode and
+ * device suspend latency considerations will be added later.
+ */
+ if (snd_sof_stream_suspend_ignored(sdev))
+ target_dsp_state = SOF_DSP_PM_D0;
+ else
+ target_dsp_state = SOF_DSP_PM_D3;
+ break;
+ default:
+ /* This case would be during runtime suspend */
+ target_dsp_state = SOF_DSP_PM_D3;
+ break;
+ }
+
+ return target_dsp_state;
+}
+
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
+static void sof_cache_debugfs(struct snd_sof_dev *sdev)
+{
+ struct snd_sof_dfsentry *dfse;
+
+ list_for_each_entry(dfse, &sdev->dfsentry_list, list) {
+
+ /* nothing to do if debugfs buffer is not IO mem */
+ if (dfse->type == SOF_DFSENTRY_TYPE_BUF)
+ continue;
+
+ /* cache memory that is only accessible in D0 */
+ if (dfse->access_type == SOF_DEBUGFS_ACCESS_D0_ONLY)
+ memcpy_fromio(dfse->cache_buf, dfse->io_mem,
+ dfse->size);
+ }
+}
+#endif
+
+static int sof_resume(struct device *dev, bool runtime_resume)
+{
+ struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+ const struct sof_ipc_pm_ops *pm_ops = sof_ipc_get_ops(sdev, pm);
+ const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
+ u32 old_state = sdev->dsp_power_state.state;
+ int ret;
+
+ /* do nothing if dsp resume callbacks are not set */
+ if (!runtime_resume && !sof_ops(sdev)->resume)
+ return 0;
+
+ if (runtime_resume && !sof_ops(sdev)->runtime_resume)
+ return 0;
+
+ /* DSP was never successfully started, nothing to resume */
+ if (sdev->first_boot)
+ return 0;
+
+ /*
+ * if the runtime_resume flag is set, call the runtime_resume routine
+ * or else call the system resume routine
+ */
+ if (runtime_resume)
+ ret = snd_sof_dsp_runtime_resume(sdev);
+ else
+ ret = snd_sof_dsp_resume(sdev);
+ if (ret < 0) {
+ dev_err(sdev->dev,
+ "error: failed to power up DSP after resume\n");
+ return ret;
+ }
+
+ if (sdev->dspless_mode_selected) {
+ sof_set_fw_state(sdev, SOF_DSPLESS_MODE);
+ return 0;
+ }
+
+ /*
+ * Nothing further to be done for platforms that support the low power
+ * D0 substate. Resume trace and return when resuming from
+ * low-power D0 substate
+ */
+ if (!runtime_resume && sof_ops(sdev)->set_power_state &&
+ old_state == SOF_DSP_PM_D0) {
+ ret = sof_fw_trace_resume(sdev);
+ if (ret < 0)
+ /* non fatal */
+ dev_warn(sdev->dev,
+ "failed to enable trace after resume %d\n", ret);
+ return 0;
+ }
+
+ sof_set_fw_state(sdev, SOF_FW_BOOT_PREPARE);
+
+ /* load the firmware */
+ ret = snd_sof_load_firmware(sdev);
+ if (ret < 0) {
+ dev_err(sdev->dev,
+ "error: failed to load DSP firmware after resume %d\n",
+ ret);
+ sof_set_fw_state(sdev, SOF_FW_BOOT_FAILED);
+ return ret;
+ }
+
+ sof_set_fw_state(sdev, SOF_FW_BOOT_IN_PROGRESS);
+
+ /*
+ * Boot the firmware. The FW boot status will be modified
+ * in snd_sof_run_firmware() depending on the outcome.
+ */
+ ret = snd_sof_run_firmware(sdev);
+ if (ret < 0) {
+ dev_err(sdev->dev,
+ "error: failed to boot DSP firmware after resume %d\n",
+ ret);
+ sof_set_fw_state(sdev, SOF_FW_BOOT_FAILED);
+ return ret;
+ }
+
+ /* resume DMA trace */
+ ret = sof_fw_trace_resume(sdev);
+ if (ret < 0) {
+ /* non fatal */
+ dev_warn(sdev->dev,
+ "warning: failed to init trace after resume %d\n",
+ ret);
+ }
+
+ /* restore pipelines */
+ if (tplg_ops && tplg_ops->set_up_all_pipelines) {
+ ret = tplg_ops->set_up_all_pipelines(sdev, false);
+ if (ret < 0) {
+ dev_err(sdev->dev, "Failed to restore pipeline after resume %d\n", ret);
+ goto setup_fail;
+ }
+ }
+
+ /* Notify clients not managed by pm framework about core resume */
+ sof_resume_clients(sdev);
+
+ /* notify DSP of system resume */
+ if (pm_ops && pm_ops->ctx_restore) {
+ ret = pm_ops->ctx_restore(sdev);
+ if (ret < 0)
+ dev_err(sdev->dev, "ctx_restore IPC error during resume: %d\n", ret);
+ }
+
+setup_fail:
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
+ if (ret < 0) {
+ /*
+ * Debugfs cannot be read in runtime suspend, so cache
+ * the contents upon failure. This allows to capture
+ * possible DSP coredump information.
+ */
+ sof_cache_debugfs(sdev);
+ }
+#endif
+
+ return ret;
+}
+
+static int sof_suspend(struct device *dev, bool runtime_suspend)
+{
+ struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+ const struct sof_ipc_pm_ops *pm_ops = sof_ipc_get_ops(sdev, pm);
+ const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
+ pm_message_t pm_state;
+ u32 target_state = snd_sof_dsp_power_target(sdev);
+ u32 old_state = sdev->dsp_power_state.state;
+ int ret;
+
+ /* do nothing if dsp suspend callback is not set */
+ if (!runtime_suspend && !sof_ops(sdev)->suspend)
+ return 0;
+
+ if (runtime_suspend && !sof_ops(sdev)->runtime_suspend)
+ return 0;
+
+ /* we need to tear down pipelines only if the DSP hardware is
+ * active, which happens for PCI devices. if the device is
+ * suspended, it is brought back to full power and then
+ * suspended again
+ */
+ if (tplg_ops && tplg_ops->tear_down_all_pipelines && (old_state == SOF_DSP_PM_D0))
+ tplg_ops->tear_down_all_pipelines(sdev, false);
+
+ if (sdev->fw_state != SOF_FW_BOOT_COMPLETE)
+ goto suspend;
+
+ /* prepare for streams to be resumed properly upon resume */
+ if (!runtime_suspend) {
+ ret = snd_sof_dsp_hw_params_upon_resume(sdev);
+ if (ret < 0) {
+ dev_err(sdev->dev,
+ "error: setting hw_params flag during suspend %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ pm_state.event = target_state;
+
+ /* suspend DMA trace */
+ sof_fw_trace_suspend(sdev, pm_state);
+
+ /* Notify clients not managed by pm framework about core suspend */
+ sof_suspend_clients(sdev, pm_state);
+
+ /* Skip to platform-specific suspend if DSP is entering D0 */
+ if (target_state == SOF_DSP_PM_D0)
+ goto suspend;
+
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
+ /* cache debugfs contents during runtime suspend */
+ if (runtime_suspend)
+ sof_cache_debugfs(sdev);
+#endif
+ /* notify DSP of upcoming power down */
+ if (pm_ops && pm_ops->ctx_save) {
+ ret = pm_ops->ctx_save(sdev);
+ if (ret == -EBUSY || ret == -EAGAIN) {
+ /*
+ * runtime PM has logic to handle -EBUSY/-EAGAIN so
+ * pass these errors up
+ */
+ dev_err(sdev->dev, "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);
+ }
+ }
+
+suspend:
+
+ /* return if the DSP was not probed successfully */
+ if (sdev->fw_state == SOF_FW_BOOT_NOT_STARTED)
+ return 0;
+
+ /* platform-specific suspend */
+ if (runtime_suspend)
+ ret = snd_sof_dsp_runtime_suspend(sdev);
+ else
+ ret = snd_sof_dsp_suspend(sdev, target_state);
+ if (ret < 0)
+ dev_err(sdev->dev,
+ "error: failed to power down DSP during suspend %d\n",
+ ret);
+
+ /* Do not reset FW state if DSP is in D0 */
+ if (target_state == SOF_DSP_PM_D0)
+ return ret;
+
+ /* reset FW state */
+ sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);
+ sdev->enabled_cores_mask = 0;
+
+ return ret;
+}
+
+int snd_sof_dsp_power_down_notify(struct snd_sof_dev *sdev)
+{
+ const struct sof_ipc_pm_ops *pm_ops = sof_ipc_get_ops(sdev, pm);
+
+ /* Notify DSP of upcoming power down */
+ if (sof_ops(sdev)->remove && pm_ops && pm_ops->ctx_save)
+ return pm_ops->ctx_save(sdev);
+
+ return 0;
+}
+
+int snd_sof_runtime_suspend(struct device *dev)
+{
+ return sof_suspend(dev, true);
+}
+EXPORT_SYMBOL(snd_sof_runtime_suspend);
+
+int snd_sof_runtime_idle(struct device *dev)
+{
+ struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+
+ return snd_sof_dsp_runtime_idle(sdev);
+}
+EXPORT_SYMBOL(snd_sof_runtime_idle);
+
+int snd_sof_runtime_resume(struct device *dev)
+{
+ return sof_resume(dev, true);
+}
+EXPORT_SYMBOL(snd_sof_runtime_resume);
+
+int snd_sof_resume(struct device *dev)
+{
+ return sof_resume(dev, false);
+}
+EXPORT_SYMBOL(snd_sof_resume);
+
+int snd_sof_suspend(struct device *dev)
+{
+ return sof_suspend(dev, false);
+}
+EXPORT_SYMBOL(snd_sof_suspend);
+
+int snd_sof_prepare(struct device *dev)
+{
+ struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+ const struct sof_dev_desc *desc = sdev->pdata->desc;
+
+ /* will suspend to S3 by default */
+ sdev->system_suspend_target = SOF_SUSPEND_S3;
+
+ /*
+ * if the firmware is crashed or boot failed then we try to aim for S3
+ * to reboot the firmware
+ */
+ if (sdev->fw_state == SOF_FW_CRASHED ||
+ sdev->fw_state == SOF_FW_BOOT_FAILED)
+ return 0;
+
+ if (!desc->use_acpi_target_states)
+ return 0;
+
+#if defined(CONFIG_ACPI)
+ switch (acpi_target_system_state()) {
+ case ACPI_STATE_S0:
+ sdev->system_suspend_target = SOF_SUSPEND_S0IX;
+ break;
+ case ACPI_STATE_S1:
+ case ACPI_STATE_S2:
+ case ACPI_STATE_S3:
+ sdev->system_suspend_target = SOF_SUSPEND_S3;
+ break;
+ case ACPI_STATE_S4:
+ sdev->system_suspend_target = SOF_SUSPEND_S4;
+ break;
+ case ACPI_STATE_S5:
+ sdev->system_suspend_target = SOF_SUSPEND_S5;
+ break;
+ default:
+ break;
+ }
+#endif
+
+ return 0;
+}
+EXPORT_SYMBOL(snd_sof_prepare);
+
+void snd_sof_complete(struct device *dev)
+{
+ struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+
+ sdev->system_suspend_target = SOF_SUSPEND_NONE;
+}
+EXPORT_SYMBOL(snd_sof_complete);