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ASoC: SOF: Intel: hda: Allow trace DMA in S0 when DSP is in D0I3 for debug

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Trace DMA is disabled by default when the DSP is in D0I3.
Add a debug option to keep trace DMA enabled when the DSP
is in D0I3 during S0.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200129220726.31792-10-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ranjani Sridharan 2020-01-29 16:07:26 -06:00 committed by Mark Brown
parent 63e51fd33f
commit 851fd87324
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 32 additions and 3 deletions
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35
sound/soc/sof/intel/hda-dsp.c
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@ -15,6 +15,7 @@
* Hardware interface for generic Intel audio DSP HDA IP
*/
#include <linux/module.h>
#include <sound/hdaudio_ext.h>
#include <sound/hda_register.h>
#include "../sof-audio.h"
@ -22,6 +23,13 @@
#include "hda.h"
#include "hda-ipc.h"
static bool hda_enable_trace_D0I3_S0;
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG)
module_param_named(enable_trace_D0I3_S0, hda_enable_trace_D0I3_S0, bool, 0444);
MODULE_PARM_DESC(enable_trace_D0I3_S0,
"SOF HDA enable trace when the DSP is in D0I3 in S0");
#endif
/*
* DSP Core control.
*/
@ -399,8 +407,14 @@ static int hda_dsp_set_D0_state(struct snd_sof_dev *sdev,
if (target_state->substate == SOF_HDA_DSP_PM_D0I3) {
value = SOF_HDA_VS_D0I3C_I3;
/* disable DMA trace in D0I3 */
flags = HDA_PM_NO_DMA_TRACE;
/*
* Trace DMA is disabled by default when the DSP enters D0I3.
* But it can be kept enabled when the DSP enters D0I3 while the
* system is in S0 for debug.
*/
if (hda_enable_trace_D0I3_S0 &&
sdev->system_suspend_target != SOF_SUSPEND_NONE)
flags = HDA_PM_NO_DMA_TRACE;
} else {
/* prevent power gating in D0I0 */
flags = HDA_PM_PPG;
@ -450,11 +464,26 @@ int hda_dsp_set_power_state(struct snd_sof_dev *sdev,
{
int ret = 0;
/* Nothing to do if the DSP is already in the requested state */
/*
* When the DSP is already in D0I3 and the target state is D0I3,
* it could be the case that the DSP is in D0I3 during S0
* and the system is suspending to S0Ix. Therefore,
* hda_dsp_set_D0_state() must be called to disable trace DMA
* by sending the PM_GATE IPC to the FW.
*/
if (target_state->substate == SOF_HDA_DSP_PM_D0I3 &&
sdev->system_suspend_target == SOF_SUSPEND_S0IX)
goto set_state;
/*
* For all other cases, return without doing anything if
* the DSP is already in the target state.
*/
if (target_state->state == sdev->dsp_power_state.state &&
target_state->substate == sdev->dsp_power_state.substate)
return 0;
set_state:
switch (target_state->state) {
case SOF_DSP_PM_D0:
ret = hda_dsp_set_D0_state(sdev, target_state);