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Commit 2e610270 authored by Adrian Knoth's avatar Adrian Knoth Committed by Takashi Iwai
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ALSA: hdspm - Enable 32 samples/period on RME RayDAT/AIO 



Newer RME cards like RayDAT and AIO support 32 samples per period. This
value is encoded as {1,1,1} in the HDSP_LatencyMask bits in the control
register.

Since {1,1,1} is also the representation for 8192 samples/period on
older RME cards, we have to special case 32 samples and 32768 bytes
according to the actual card.

Signed-off-by: default avatarAdrian Knoth <adi@drcomp.erfurt.thur.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 7cb155ff

sound/pci/rme9652/hdspm.c

+20 −5
Original line number Diff line number Diff line
@@ -1323,12 +1323,27 @@ static int hdspm_set_interrupt_interval(struct hdspm *s, unsigned int frames) 


	spin_lock_irq(&s->lock);



	if (32 == frames) {

		/* Special case for new RME cards like RayDAT/AIO which

		 * support period sizes of 32 samples. Since latency is

		 * encoded in the three bits of HDSP_LatencyMask, we can only

		 * have values from 0 .. 7. While 0 still means 64 samples and

		 * 6 represents 4096 samples on all cards, 7 represents 8192

		 * on older cards and 32 samples on new cards.

		 *

		 * In other words, period size in samples is calculated by

		 * 2^(n+6) with n ranging from 0 .. 7.

		 */

		n = 7;

	} else {

		frames >>= 7;

		n = 0;

		while (frames) {

			n++;

			frames >>= 1;

		}

	}



	s->control_register &= ~HDSPM_LatencyMask;

	s->control_register |= hdspm_encode_latency(n);