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ALSA: hda - Workaround for crackled sound on AMD controller (1022:1457) 

A long-time problem on the recent AMD chip (X370, X470, B450, etc with
PCI ID 1022:1457) with Realtek codecs is the crackled or distorted
sound for capture streams, as well as occasional playback hiccups.
After lengthy debugging sessions, the workarounds we've found are like
the following:

- Set up the proper driver caps for this controller, similar as the
  other AMD controller.

- Correct the DMA position reporting with the fixed FIFO size, which
  is similar like as workaround used for VIA chip set.

- Even after the position correction, PulseAudio still shows
  mysterious stalls of playback streams when a capture is triggered in
  timer-scheduled mode.  Since we have no clear way to eliminate the
  stall, pass the BATCH PCM flag for PA to suppress the tsched mode as
  a temporary workaround.

This patch implements the workarounds.  For the driver caps, it
defines a new preset, AXZ_DCAPS_PRESET_AMD_SB.  It enables the FIFO-
corrected position reporting (corresponding to the new position_fix=6)
and enforces the SNDRV_PCM_INFO_BATCH flag.

Note that the current implementation is merely a workaround.
Hopefully we'll find a better alternative in future, especially about
removing the BATCH flag hack again.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=195303
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-08-06 17:31:48 +02:00
parent 3d92aa45fb
commit c02f77d32d
3 changed files with 70 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
sound/pci/hda/hda_controller.c
View File

@ -613,6 +613,13 @@ static int azx_pcm_open(struct snd_pcm_substream *substream)
20,
178000000);
/* by some reason, the playback stream stalls on PulseAudio with
* tsched=1 when a capture stream triggers. Until we figure out the
* real cause, disable tsched mode by telling the PCM info flag.
*/
if (chip->driver_caps & AZX_DCAPS_AMD_WORKAROUND)
runtime->hw.info |= SNDRV_PCM_INFO_BATCH;
if (chip->align_buffer_size)
/* constrain buffer sizes to be multiple of 128
bytes. This is more efficient in terms of memory

2
sound/pci/hda/hda_controller.h
View File

@ -31,7 +31,7 @@
/* 14 unused */
#define AZX_DCAPS_CTX_WORKAROUND (1 << 15) /* X-Fi workaround */
#define AZX_DCAPS_POSFIX_LPIB (1 << 16) /* Use LPIB as default */
/* 17 unused */
#define AZX_DCAPS_AMD_WORKAROUND (1 << 17) /* AMD-specific workaround */
#define AZX_DCAPS_NO_64BIT (1 << 18) /* No 64bit address */
#define AZX_DCAPS_SYNC_WRITE (1 << 19) /* sync each cmd write */
#define AZX_DCAPS_OLD_SSYNC (1 << 20) /* Old SSYNC reg for ICH */

63
sound/pci/hda/hda_intel.c
View File

@ -64,6 +64,7 @@ enum {
POS_FIX_VIACOMBO,
POS_FIX_COMBO,
POS_FIX_SKL,
POS_FIX_FIFO,
};
/* Defines for ATI HD Audio support in SB450 south bridge */
@ -135,7 +136,7 @@ module_param_array(model, charp, NULL, 0444);
MODULE_PARM_DESC(model, "Use the given board model.");
module_param_array(position_fix, int, NULL, 0444);
MODULE_PARM_DESC(position_fix, "DMA pointer read method."
"(-1 = system default, 0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO, 5 = SKL+).");
"(-1 = system default, 0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO, 5 = SKL+, 6 = FIFO).");
module_param_array(bdl_pos_adj, int, NULL, 0644);
MODULE_PARM_DESC(bdl_pos_adj, "BDL position adjustment offset.");
module_param_array(probe_mask, int, NULL, 0444);
@ -332,6 +333,11 @@ enum {
#define AZX_DCAPS_PRESET_ATI_HDMI_NS \
(AZX_DCAPS_PRESET_ATI_HDMI | AZX_DCAPS_SNOOP_OFF)
/* quirks for AMD SB */
#define AZX_DCAPS_PRESET_AMD_SB \
(AZX_DCAPS_NO_TCSEL | AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_AMD_WORKAROUND |\
AZX_DCAPS_SNOOP_TYPE(ATI) | AZX_DCAPS_PM_RUNTIME)
/* quirks for Nvidia */
#define AZX_DCAPS_PRESET_NVIDIA \
(AZX_DCAPS_NO_MSI | AZX_DCAPS_CORBRP_SELF_CLEAR |\
@ -841,6 +847,49 @@ static unsigned int azx_via_get_position(struct azx *chip,
return bound_pos + mod_dma_pos;
}
#define AMD_FIFO_SIZE 32
/* get the current DMA position with FIFO size correction */
static unsigned int azx_get_pos_fifo(struct azx *chip, struct azx_dev *azx_dev)
{
struct snd_pcm_substream *substream = azx_dev->core.substream;
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int pos, delay;
pos = snd_hdac_stream_get_pos_lpib(azx_stream(azx_dev));
if (!runtime)
return pos;
runtime->delay = AMD_FIFO_SIZE;
delay = frames_to_bytes(runtime, AMD_FIFO_SIZE);
if (azx_dev->insufficient) {
if (pos < delay) {
delay = pos;
runtime->delay = bytes_to_frames(runtime, pos);
} else {
azx_dev->insufficient = 0;
}
}
/* correct the DMA position for capture stream */
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
if (pos < delay)
pos += azx_dev->core.bufsize;
pos -= delay;
}
return pos;
}
static int azx_get_delay_from_fifo(struct azx *chip, struct azx_dev *azx_dev,
unsigned int pos)
{
struct snd_pcm_substream *substream = azx_dev->core.substream;
/* just read back the calculated value in the above */
return substream->runtime->delay;
}
static unsigned int azx_skl_get_dpib_pos(struct azx *chip,
struct azx_dev *azx_dev)
{
@ -1417,6 +1466,7 @@ static int check_position_fix(struct azx *chip, int fix)
case POS_FIX_VIACOMBO:
case POS_FIX_COMBO:
case POS_FIX_SKL:
case POS_FIX_FIFO:
return fix;
}
@ -1433,6 +1483,10 @@ static int check_position_fix(struct azx *chip, int fix)
dev_dbg(chip->card->dev, "Using VIACOMBO position fix\n");
return POS_FIX_VIACOMBO;
}
if (chip->driver_caps & AZX_DCAPS_AMD_WORKAROUND) {
dev_dbg(chip->card->dev, "Using FIFO position fix\n");
return POS_FIX_FIFO;
}
if (chip->driver_caps & AZX_DCAPS_POSFIX_LPIB) {
dev_dbg(chip->card->dev, "Using LPIB position fix\n");
return POS_FIX_LPIB;
@ -1453,6 +1507,7 @@ static void assign_position_fix(struct azx *chip, int fix)
[POS_FIX_VIACOMBO] = azx_via_get_position,
[POS_FIX_COMBO] = azx_get_pos_lpib,
[POS_FIX_SKL] = azx_get_pos_skl,
[POS_FIX_FIFO] = azx_get_pos_fifo,
};
chip->get_position[0] = chip->get_position[1] = callbacks[fix];
@ -1467,6 +1522,9 @@ static void assign_position_fix(struct azx *chip, int fix)
azx_get_delay_from_lpib;
}
if (fix == POS_FIX_FIFO)
chip->get_delay[0] = chip->get_delay[1] =
azx_get_delay_from_fifo;
}
/*
@ -2447,6 +2505,9 @@ static const struct pci_device_id azx_ids[] = {
/* AMD Hudson */
{ PCI_DEVICE(0x1022, 0x780d),
.driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_ATI_SB },
/* AMD, X370 & co */
{ PCI_DEVICE(0x1022, 0x1457),
.driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_AMD_SB },
/* AMD Stoney */
{ PCI_DEVICE(0x1022, 0x157a),
.driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_ATI_SB |