2.6.32-stable review patch. If anyone has any objections, please let us know.
------------------
From: Jaroslav Kysela <perex@perex.cz>
commit 56385a12d9bb9e173751f74b6c430742018cafc0 upstream.
With some hardware combinations, the PCM interrupts are acknowledged
before the period boundary from the emu10k1 chip. The midlevel PCM code
gets confused and the playback stream is interrupted.
It seems that the interrupt processing shift by 2 samples is enough
to fix this issue. This default value does not harm other,
non-affected hardware.
More information: Kernel bugzilla bug#16300
[A copmile warning fixed by tiwai]
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
include/sound/emu10k1.h | 1 +
sound/core/pcm_native.c | 4 ++++
sound/pci/emu10k1/emu10k1.c | 4 ++++
sound/pci/emu10k1/emupcm.c | 30 ++++++++++++++++++++++++++----
sound/pci/emu10k1/memory.c | 4 +++-
5 files changed, 38 insertions(+), 5 deletions(-)
--- a/include/sound/emu10k1.h
+++ b/include/sound/emu10k1.h
@@ -1707,6 +1707,7 @@ struct snd_emu10k1 {
unsigned int card_type; /* EMU10K1_CARD_* */
unsigned int ecard_ctrl; /* ecard control bits */
unsigned long dma_mask; /* PCI DMA mask */
+ unsigned int delay_pcm_irq; /* in samples */
int max_cache_pages; /* max memory size / PAGE_SIZE */
struct snd_dma_buffer silent_page; /* silent page */
struct snd_dma_buffer ptb_pages; /* page table pages */
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -972,6 +972,10 @@ static int snd_pcm_do_pause(struct snd_p
{
if (substream->runtime->trigger_master != substream)
return 0;
+ /* some drivers might use hw_ptr to recover from the pause -
+ update the hw_ptr now */
+ if (push)
+ snd_pcm_update_hw_ptr(substream);
/* The jiffies check in snd_pcm_update_hw_ptr*() is done by
* a delta betwen the current jiffies, this gives a large ...
