From: Florian Zumbiehl <florz@florz.de>
Date: Tue, 26 Jan 2010 08:06:14 +0000 (+0100)
Subject: ALSA: cs46xx: Fix cpu idling with resume
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=cf944ee55cc318bdb1d4b2f3f5cce3257f7c07b3;p=deliverable%2Flinux.git

ALSA: cs46xx: Fix cpu idling with resume

Make sure that capture DMA doesn't stay enabled after system resume
as that potentially prevents the processor from entering deep sleep
states.

Signed-off-by: Florian Zumbiehl <florz@florz.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/pci/cs46xx/cs46xx_lib.c b/sound/pci/cs46xx/cs46xx_lib.c
index e6b4a879ae2e..56fcf00c0e27 100644
--- a/sound/pci/cs46xx/cs46xx_lib.c
+++ b/sound/pci/cs46xx/cs46xx_lib.c
@@ -3644,6 +3644,7 @@ int snd_cs46xx_resume(struct pci_dev *pci)
 #ifdef CONFIG_SND_CS46XX_NEW_DSP
 	int i;
 #endif
+	unsigned int tmp;
 
 	pci_set_power_state(pci, PCI_D0);
 	pci_restore_state(pci);
@@ -3685,6 +3686,15 @@ int snd_cs46xx_resume(struct pci_dev *pci)
 	snd_ac97_resume(chip->ac97[CS46XX_PRIMARY_CODEC_INDEX]);
 	snd_ac97_resume(chip->ac97[CS46XX_SECONDARY_CODEC_INDEX]);
 
+	/*
+         *  Stop capture DMA.
+	 */
+	tmp = snd_cs46xx_peek(chip, BA1_CCTL);
+	chip->capt.ctl = tmp & 0x0000ffff;
+	snd_cs46xx_poke(chip, BA1_CCTL, tmp & 0xffff0000);
+
+	mdelay(5);
+
 	/* reset playback/capture */
 	snd_cs46xx_set_play_sample_rate(chip, 8000);
 	snd_cs46xx_set_capture_sample_rate(chip, 8000);