ALSA: hdspm - Enable 32 samples/period on RME RayDAT/AIO (2e610270) · Commits · 戴 / test

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:

Adrian Knoth <adi@drcomp.erfurt.thur.de> Signed-off-by:

Takashi Iwai <tiwai@suse.de>

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);

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