From f87e7f25893d7db4da465c6b50882197e518d4af Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 29 Mar 2017 08:46:00 +0200 Subject: [PATCH] ALSA: hda - Improved position reporting on SKL+ Apply the same methods to obtain the current stream position as ASoC Intel SKL driver uses. It reads the position from DPIB for a playback stream while it still reads from the position buffer for a capture stream. For a capture stream, some ugly workaround is needed to settle down the inconsistent position. Acked-by: Vinod Koul Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_intel.c | 36 ++++++++++++++++++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-) diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index a48330f4a1a9..64db6698214c 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -77,6 +77,7 @@ enum { POS_FIX_POSBUF, POS_FIX_VIACOMBO, POS_FIX_COMBO, + POS_FIX_SKL, }; /* Defines for ATI HD Audio support in SB450 south bridge */ @@ -148,7 +149,7 @@ 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)."); + "(-1 = system default, 0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO, 5 = SKL+)."); 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); @@ -815,6 +816,31 @@ static unsigned int azx_via_get_position(struct azx *chip, return bound_pos + mod_dma_pos; } +static unsigned int azx_skl_get_dpib_pos(struct azx *chip, + struct azx_dev *azx_dev) +{ + return _snd_hdac_chip_readl(azx_bus(chip), + AZX_REG_VS_SDXDPIB_XBASE + + (AZX_REG_VS_SDXDPIB_XINTERVAL * + azx_dev->core.index)); +} + +/* get the current DMA position with correction on SKL+ chips */ +static unsigned int azx_get_pos_skl(struct azx *chip, struct azx_dev *azx_dev) +{ + /* DPIB register gives a more accurate position for playback */ + if (azx_dev->core.substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + return azx_skl_get_dpib_pos(chip, azx_dev); + + /* For capture, we need to read posbuf, but it requires a delay + * for the possible boundary overlap; the read of DPIB fetches the + * actual posbuf + */ + udelay(20); + azx_skl_get_dpib_pos(chip, azx_dev); + return azx_get_pos_posbuf(chip, azx_dev); +} + #ifdef CONFIG_PM static DEFINE_MUTEX(card_list_lock); static LIST_HEAD(card_list); @@ -1351,6 +1377,7 @@ static int check_position_fix(struct azx *chip, int fix) case POS_FIX_POSBUF: case POS_FIX_VIACOMBO: case POS_FIX_COMBO: + case POS_FIX_SKL: return fix; } @@ -1371,6 +1398,10 @@ static int check_position_fix(struct azx *chip, int fix) dev_dbg(chip->card->dev, "Using LPIB position fix\n"); return POS_FIX_LPIB; } + if (IS_SKL_PLUS(chip->pci)) { + dev_dbg(chip->card->dev, "Using SKL position fix\n"); + return POS_FIX_SKL; + } return POS_FIX_AUTO; } @@ -1382,6 +1413,7 @@ static void assign_position_fix(struct azx *chip, int fix) [POS_FIX_POSBUF] = azx_get_pos_posbuf, [POS_FIX_VIACOMBO] = azx_via_get_position, [POS_FIX_COMBO] = azx_get_pos_lpib, + [POS_FIX_SKL] = azx_get_pos_skl, }; chip->get_position[0] = chip->get_position[1] = callbacks[fix]; @@ -1390,7 +1422,7 @@ static void assign_position_fix(struct azx *chip, int fix) if (fix == POS_FIX_COMBO) chip->get_position[1] = NULL; - if (fix == POS_FIX_POSBUF && + if ((fix == POS_FIX_POSBUF || fix == POS_FIX_SKL) && (chip->driver_caps & AZX_DCAPS_COUNT_LPIB_DELAY)) { chip->get_delay[0] = chip->get_delay[1] = azx_get_delay_from_lpib; -- 2.20.1