[alsa-devel] es1938 - patch trying to improve capture hw pointer reads

Hello,

with the Solo1 (es1938) I got a lot of xrun's during capture on my machine. Tracing that down it seems to be comming from reading ocassionaly bad hw pointers from the chip. Appended is a patch against linux-2.6.23.12 which uses more checking to avoid that false pointer reads.

Failed reads are giving back the last good value read instead of spinning in a tight loop, which seems more appropriate to me in an interrupt. I think I saw this trick used in another driver.

On my machine xruns seems to be gone with that patch.

If anybody is interested, mmaped capture seems also to be doable with some tricks, still testing this...

Greetings

Hermann