At Thu, 7 Apr 2011 16:54:50 +0800, Xu, Andiry wrote:
Hi Takashi,
Currently I encountered an HD audio issue reported by customer on a Lenovo x100e system. Sometimes, but not always, when starting a recording stream through the HDA controller, the controller generates a large amount of interrupts (~40 000 interrupts per second). After this has happened, jack sense (i e unsolicited events from the codec) stops working until the next system reboot.
SD0STS returns a FIFO error (0x28) in interrupt handler. The interrupt service routine acknowledges this error but does not do anything to counteract the root cause to the problem, so it appears again and again. Restarting the stream does not seem to help. Enable MSI or not does not help either.
The issue occurs on 2.6.35 and 2.6.38-rc8+, have not tried latest kernel yet but I think it's also there. FIFO error indicates FIFO overrun occurring while the RUN bit is set, but the driver simply acknowledge and clear the error. I wonder what the root cause and the right treatment are in this case. Any suggestions?
FIFO_ERR is actually never handled, so basically we can ignore. Simply disabling it like below works around your problem?
Of course, a proper handling of FIFO error would be better, but this may need more code rewrites.
thanks,
Takashi
--- diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 70a9d32..a88baf4 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -285,7 +285,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 }; #define SD_INT_DESC_ERR 0x10 /* descriptor error interrupt */ #define SD_INT_FIFO_ERR 0x08 /* FIFO error interrupt */ #define SD_INT_COMPLETE 0x04 /* completion interrupt */ -#define SD_INT_MASK (SD_INT_DESC_ERR|SD_INT_FIFO_ERR|\ +#define SD_INT_MASK (SD_INT_DESC_ERR|/*SD_INT_FIFO_ERR|*/ \ SD_INT_COMPLETE)
/* SD_STS */