On Mon, 07 Dec 2015 08:59:13 +0100, han.lu@intel.com wrote:
From: "Lu, Han" han.lu@intel.com
In BXT-P A0, HD-Audio DMA requests is later than expected, and makes an audio stream sensitive to system latencies when 24/32 bits are playing. Adjusting threshold of DMA fifo to force the DMA request sooner to improve latency tolerance at the expense of power.
v2: move Intel specific code to hda_intel.c
Signed-off-by: Lu, Han han.lu@intel.com
Applied, thanks.
Takashi
diff --git a/include/sound/hda_register.h b/include/sound/hda_register.h index 2ae8812..94dc6a9 100644 --- a/include/sound/hda_register.h +++ b/include/sound/hda_register.h @@ -93,6 +93,9 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 }; #define AZX_REG_HSW_EM4 0x100c #define AZX_REG_HSW_EM5 0x1010
+/* Skylake/Broxton display HD-A controller Extended Mode registers */ +#define AZX_REG_SKL_EM4L 0x1040
/* PCI space */ #define AZX_PCIREG_TCSEL 0x44
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 963f824..bff5c8b 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -355,6 +355,8 @@ enum { ((pci)->device == 0x0d0c) || \ ((pci)->device == 0x160c))
+#define IS_BROXTON(pci) ((pci)->device == 0x5a98)
static char *driver_short_names[] = { [AZX_DRIVER_ICH] = "HDA Intel", [AZX_DRIVER_PCH] = "HDA Intel PCH", @@ -506,15 +508,36 @@ static void azx_init_pci(struct azx *chip) } }
+/*
- In BXT-P A0, HD-Audio DMA requests is later than expected,
- and makes an audio stream sensitive to system latencies when
- 24/32 bits are playing.
- Adjusting threshold of DMA fifo to force the DMA request
- sooner to improve latency tolerance at the expense of power.
- */
+static void bxt_reduce_dma_latency(struct azx *chip) +{
- u32 val;
- val = azx_readl(chip, SKL_EM4L);
- val &= (0x3 << 20);
- azx_writel(chip, SKL_EM4L, val);
+}
static void hda_intel_init_chip(struct azx *chip, bool full_reset) { struct hdac_bus *bus = azx_bus(chip);
struct pci_dev *pci = chip->pci;
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) snd_hdac_set_codec_wakeup(bus, true); azx_init_chip(chip, full_reset); if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) snd_hdac_set_codec_wakeup(bus, false);
/* reduce dma latency to avoid noise */
if (IS_BROXTON(pci))
bxt_reduce_dma_latency(chip);}
/* calculate runtime delay from LPIB */
2.5.0