linux-kernel - [PATCH 3.4 035/172] ALSA: hdspm - Constrain periods to 2 on older cards

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Date:	Tue, 16 Jun 2015 16:34:49 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Adrian Knoth <adi@...omp.erfurt.thur.de>,
	Takashi Iwai <tiwai@...e.de>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 035/172] ALSA: hdspm - Constrain periods to 2 on older cards

From: Adrian Knoth <adi@...omp.erfurt.thur.de>

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit f0153c3d948c1764f6c920a0675d86fc1d75813e upstream.

RME RayDAT and AIO use a fixed buffer size of 16384 samples. With period
sizes of 32-4096, this translates to 4-512 periods.

The older RME cards have a variable buffer size but require exactly two
periods.

This patch enforces nperiods=2 on those cards.

Signed-off-by: Adrian Knoth <adi@...omp.erfurt.thur.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 sound/pci/rme9652/hdspm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index bc030a2..0627ffe 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -6042,6 +6042,12 @@ static int snd_hdspm_capture_open(struct snd_pcm_substream *substream)
 		snd_pcm_hw_constraint_minmax(runtime,
 					     SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
 					     64, 8192);
+		snd_pcm_hw_constraint_minmax(runtime,
+					     SNDRV_PCM_HW_PARAM_PERIODS,
+					     2, 2);
+		snd_pcm_hw_constraint_minmax(runtime,
+					     SNDRV_PCM_HW_PARAM_PERIODS,
+					     2, 2);
 		break;
 	}
 
-- 
1.9.1

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