linux-kernel - [PATCH] ice1712: fix: lock samplerate when samplerate locking is enabled.

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Message-ID: <4B69E06E.90308@gmail.com>
Date:	Wed, 03 Feb 2010 21:45:34 +0100
From:	Sebastien Alaiwan <sebastien.alaiwan@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] ice1712: fix: lock samplerate when samplerate locking is
 enabled.

Hello,

I found that the sampling rate locking setting of the ice1712 sound driver was
only half-respected : when the driver was locked to, let's say, 44100Hz, and a
usermode app was requesting 48000Hz playback, the request was succesful although
the soundcard would continue to run at 44100Hz.

Here's a patch that will make those requests to fail.

diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
index c7cff6f..4775626 100644
--- a/sound/pci/ice1712/ice1712.c
+++ b/sound/pci/ice1712/ice1712.c
@@ -1181,6 +1181,8 @@ static int snd_ice1712_playback_pro_open(struct snd_pcm_substream *substream)
 	snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
 	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);

+	if (is_pro_rate_locked(ice))
+		snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, PRO_RATE_DEFAULT, PRO_RATE_DEFAULT);
 	if (ice->spdif.ops.open)
 		ice->spdif.ops.open(ice, substream);

@@ -1197,6 +1199,9 @@ static int snd_ice1712_capture_pro_open(struct snd_pcm_substream *substream)
 	snd_pcm_set_sync(substream);
 	snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
 	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
+	if (is_pro_rate_locked(ice))
+		snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, PRO_RATE_DEFAULT, PRO_RATE_DEFAULT);
+
 	return 0;
 }

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