Hi,
Got a new notebook recently, it's a Lenovo X1 Carbon 9th gen. Sound works fine, but sometimes I get really stuttering playback from nestopia and I finally decided to look into it. When this happens, azx_get_pos_skl() is seemingly called a lot, at least it uses a ton of CPU cycles. This comes and goes, sometimes 1 minute in between, sometimes 2, and sometimes 30 seconds.
If I comment out the udelay() in that function it does seems to be noticeably better, though it's not a complete fix. I guess it just reduces the pain of calling it so many times?
This is running 5.14-rc7, but it's not a recent regression.
Any clues as to what this might be?
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 470753b36c8a..3c1f233e463f 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -878,7 +878,9 @@ static unsigned int azx_get_pos_skl(struct azx *chip, struct azx_dev *azx_dev) * for the possible boundary overlap; the read of DPIB fetches the * actual posbuf */ +#if 0 udelay(20); +#endif azx_skl_get_dpib_pos(chip, azx_dev); return azx_get_pos_posbuf(chip, azx_dev); }