From 3556d18465c6e67c7a8f436428b95671add02f57 Mon Sep 17 00:00:00 2001 From: Andres Salomon Date: Thu, 6 Nov 2008 16:44:08 -0500 Subject: [PATCH] ALSA: cs5535audio: invert EAPD for OLPC (newer than B3) Fix an audible pop described in . Originally based upon fixes by Mitch Bradley and Chris Ball. Signed-off-by: Andres Salomon --- sound/pci/cs5535audio/cs5535audio.c | 3 +++ sound/pci/cs5535audio/cs5535audio.h | 11 +++++++++-- sound/pci/cs5535audio/cs5535audio_olpc.c | 11 +++++++++++ 3 files changed, 23 insertions(+), 2 deletions(-) diff --git a/sound/pci/cs5535audio/cs5535audio.c b/sound/pci/cs5535audio/cs5535audio.c index 50333bb9242..130f10a8d52 100644 --- a/sound/pci/cs5535audio/cs5535audio.c +++ b/sound/pci/cs5535audio/cs5535audio.c @@ -164,6 +164,9 @@ static int __devinit snd_cs5535audio_mixer(struct cs5535audio *cs5535au) ac97.private_data = cs5535au; ac97.pci = cs5535au->pci; + /* set any OLPC-specific scaps */ + olpc_prequirks(card, &ac97); + if ((err = snd_ac97_mixer(pbus, &ac97, &cs5535au->ac97)) < 0) { snd_printk(KERN_ERR "mixer failed\n"); return err; diff --git a/sound/pci/cs5535audio/cs5535audio.h b/sound/pci/cs5535audio/cs5535audio.h index adcb213eb27..93602cf2858 100644 --- a/sound/pci/cs5535audio/cs5535audio.h +++ b/sound/pci/cs5535audio/cs5535audio.h @@ -103,9 +103,16 @@ int snd_cs5535audio_resume(struct pci_dev *pci); #endif #ifdef CONFIG_OLPC -int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97); +void __devinit olpc_prequirks(struct snd_card *card, + struct snd_ac97_template *ac97); +int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97); #else -#define olpc_quirks(arg, arg2) (0) +static inline void olpc_prequirks(struct snd_card *card, + struct snd_ac97_template *ac97) { } +static inline int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97) +{ + return 0; +} #endif int __devinit snd_cs5535audio_pcm(struct cs5535audio *cs5535audio); diff --git a/sound/pci/cs5535audio/cs5535audio_olpc.c b/sound/pci/cs5535audio/cs5535audio_olpc.c index 9073fb353f0..ff7b68ba617 100644 --- a/sound/pci/cs5535audio/cs5535audio_olpc.c +++ b/sound/pci/cs5535audio/cs5535audio_olpc.c @@ -103,6 +103,17 @@ static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata = .private_value = 0 }; +void __devinit olpc_prequirks(struct snd_card *card, + struct snd_ac97_template *ac97) +{ + if (!machine_is_olpc()) + return; + + /* invert EAPD if on an OLPC B3 or higher */ + if (olpc_board_at_least(olpc_board_pre(0xb3))) + ac97->scaps |= AC97_SCAP_INV_EAPD; +} + int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97) { if (!machine_is_olpc()) -- 2.39.3