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ASoC: SOF: Intel: hda: Disable DMI L1 entry during capture 

There is a known issue on some Intel platforms which causes
pause/release to run into xrun's during capture usecases.
The suggested workaround to address the issue is to
disable the entry of lower power L1 state in the physical
DMI link when there is a capture stream open.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190927200538.660-14-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ranjani Sridharan 2019-09-27 15:05:38 -05:00 committed by Mark Brown
parent ff2be86563
commit 43b2ab9009
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
4 changed files with 56 additions and 16 deletions
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10
sound/soc/sof/intel/Kconfig
View File

@ -273,6 +273,16 @@ config SND_SOC_SOF_HDA_AUDIO_CODEC
Say Y if you want to enable HDAudio codecs with SOF.
If unsure select "N".
config SND_SOC_SOF_HDA_ALWAYS_ENABLE_DMI_L1
bool "SOF enable DMI Link L1"
help
This option enables DMI L1 for both playback and capture
and disables known workarounds for specific HDaudio platforms.
Only use to look into power optimizations on platforms not
affected by DMI L1 issues. This option is not recommended.
Say Y if you want to enable DMI Link L1
If unsure, select "N".
endif ## SND_SOC_SOF_HDA_COMMON
config SND_SOC_SOF_HDA_LINK_BASELINE

12
sound/soc/sof/intel/hda-ctrl.c
View File

@ -139,20 +139,16 @@ void hda_dsp_ctrl_misc_clock_gating(struct snd_sof_dev *sdev, bool enable)
*/
int hda_dsp_ctrl_clock_power_gating(struct snd_sof_dev *sdev, bool enable)
{
#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
struct hdac_bus *bus = sof_to_bus(sdev);
#endif
u32 val;
/* enable/disable audio dsp clock gating */
val = enable ? PCI_CGCTL_ADSPDCGE : 0;
snd_sof_pci_update_bits(sdev, PCI_CGCTL, PCI_CGCTL_ADSPDCGE, val);
#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
/* enable/disable L1 support */
val = enable ? SOF_HDA_VS_EM2_L1SEN : 0;
snd_hdac_chip_updatel(bus, VS_EM2, SOF_HDA_VS_EM2_L1SEN, val);
#endif
/* enable/disable DMI Link L1 support */
val = enable ? HDA_VS_INTEL_EM2_L1SEN : 0;
snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR, HDA_VS_INTEL_EM2,
HDA_VS_INTEL_EM2_L1SEN, val);
/* enable/disable audio dsp power gating */
val = enable ? 0 : PCI_PGCTL_ADSPPGD;

41
sound/soc/sof/intel/hda-stream.c
View File

@ -185,6 +185,17 @@ hda_dsp_stream_get(struct snd_sof_dev *sdev, int direction)
direction == SNDRV_PCM_STREAM_PLAYBACK ?
"playback" : "capture");
/*
* Disable DMI Link L1 entry when capture stream is opened.
* Workaround to address a known issue with host DMA that results
* in xruns during pause/release in capture scenarios.
*/
if (!IS_ENABLED(SND_SOC_SOF_HDA_ALWAYS_ENABLE_DMI_L1))
if (stream && direction == SNDRV_PCM_STREAM_CAPTURE)
snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR,
HDA_VS_INTEL_EM2,
HDA_VS_INTEL_EM2_L1SEN, 0);
return stream;
}
@ -193,23 +204,43 @@ int hda_dsp_stream_put(struct snd_sof_dev *sdev, int direction, int stream_tag)
{
struct hdac_bus *bus = sof_to_bus(sdev);
struct hdac_stream *s;
bool active_capture_stream = false;
bool found = false;
spin_lock_irq(&bus->reg_lock);
/* find used stream */
/*
* close stream matching the stream tag
* and check if there are any open capture streams.
*/
list_for_each_entry(s, &bus->stream_list, list) {
if (s->direction == direction &&
s->opened && s->stream_tag == stream_tag) {
if (!s->opened)
continue;
if (s->direction == direction && s->stream_tag == stream_tag) {
s->opened = false;
spin_unlock_irq(&bus->reg_lock);
return 0;
found = true;
} else if (s->direction == SNDRV_PCM_STREAM_CAPTURE) {
active_capture_stream = true;
}
}
spin_unlock_irq(&bus->reg_lock);
/* Enable DMI L1 entry if there are no capture streams open */
if (!IS_ENABLED(SND_SOC_SOF_HDA_ALWAYS_ENABLE_DMI_L1))
if (!active_capture_stream)
snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR,
HDA_VS_INTEL_EM2,
HDA_VS_INTEL_EM2_L1SEN,
HDA_VS_INTEL_EM2_L1SEN);
if (!found) {
dev_dbg(sdev->dev, "stream_tag %d not opened!\n", stream_tag);
return -ENODEV;
}
return 0;
}
int hda_dsp_stream_trigger(struct snd_sof_dev *sdev,

5
sound/soc/sof/intel/hda.h
View File

@ -39,7 +39,6 @@
#define SOF_HDA_WAKESTS 0x0E
#define SOF_HDA_WAKESTS_INT_MASK ((1 << 8) - 1)
#define SOF_HDA_RIRBSTS 0x5d
#define SOF_HDA_VS_EM2_L1SEN BIT(13)
/* SOF_HDA_GCTL register bist */
#define SOF_HDA_GCTL_RESET BIT(0)
@ -228,6 +227,10 @@
#define HDA_DSP_REG_HIPCIE (HDA_DSP_IPC_BASE + 0x0C)
#define HDA_DSP_REG_HIPCCTL (HDA_DSP_IPC_BASE + 0x10)
/* Intel Vendor Specific Registers */
#define HDA_VS_INTEL_EM2 0x1030
#define HDA_VS_INTEL_EM2_L1SEN BIT(13)
/* HIPCI */
#define HDA_DSP_REG_HIPCI_BUSY BIT(31)
#define HDA_DSP_REG_HIPCI_MSG_MASK 0x7FFFFFFF