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[ALSA] nm256: reset workaround for Latitude CSx 

Modules: NM256 driver

The current snd-nm256 driver can cause Dell Latitude CSx laptops to
lock-up during module (un)load.  I have isolated this to the writes to
the control port register at offset 0x6cc which were not already
protected by the existing reset_workaround.

I tried grouping these writes with the existing reset_workaround
clause, but that caused the driver to have (un)load problems on the
Dell Latitude LS laptops.  So, I have implemented a reset_workaround_2
clause (please feel free to suggest a better name!) to cover this
situation and added a quirk entry for the CSx laptops.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
John W. Linville 2005-10-19 16:03:10 +02:00 committed by Jaroslav Kysela
parent d44c39acaf
commit 47530cf44c
1 changed files with 20 additions and 3 deletions
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23
sound/pci/nm256/nm256.c
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@ -62,6 +62,7 @@ static int buffer_top[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* not spe
static int use_cache[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* disabled */
static int vaio_hack[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* disabled */
static int reset_workaround[SNDRV_CARDS];
static int reset_workaround_2[SNDRV_CARDS];
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
@ -83,6 +84,8 @@ module_param_array(vaio_hack, bool, NULL, 0444);
MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
module_param_array(reset_workaround, bool, NULL, 0444);
MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
module_param_array(reset_workaround_2, bool, NULL, 0444);
MODULE_PARM_DESC(reset_workaround_2, "Enable extended AC97 RESET workaround for some other laptops.");
/*
* hw definitions
@ -226,6 +229,7 @@ struct snd_nm256 {
unsigned int coeffs_current: 1; /* coeff. table is loaded? */
unsigned int use_cache: 1; /* use one big coef. table */
unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
unsigned int reset_workaround_2: 1; /* Extended workaround for some other laptops to avoid freeze */
int mixer_base; /* register offset of ac97 mixer */
int mixer_status_offset; /* offset of mixer status reg. */
@ -1199,8 +1203,11 @@ snd_nm256_ac97_reset(ac97_t *ac97)
/* Dell latitude LS will lock up by this */
snd_nm256_writeb(chip, 0x6cc, 0x87);
}
snd_nm256_writeb(chip, 0x6cc, 0x80);
snd_nm256_writeb(chip, 0x6cc, 0x0);
if (! chip->reset_workaround_2) {
/* Dell latitude CSx will lock up by this */
snd_nm256_writeb(chip, 0x6cc, 0x80);
snd_nm256_writeb(chip, 0x6cc, 0x0);
}
}
/* create an ac97 mixer interface */
@ -1536,7 +1543,7 @@ struct nm256_quirk {
int type;
};
enum { NM_BLACKLISTED, NM_RESET_WORKAROUND };
enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };
static struct nm256_quirk nm256_quirks[] __devinitdata = {
/* HP omnibook 4150 has cs4232 codec internally */
@ -1545,6 +1552,8 @@ static struct nm256_quirk nm256_quirks[] __devinitdata = {
{ .vendor = 0x104d, .device = 0x8041, .type = NM_RESET_WORKAROUND },
/* Dell Latitude LS */
{ .vendor = 0x1028, .device = 0x0080, .type = NM_RESET_WORKAROUND },
/* Dell Latitude CSx */
{ .vendor = 0x1028, .device = 0x0091, .type = NM_RESET_WORKAROUND_2 },
{ } /* terminator */
};
@ -1576,6 +1585,9 @@ static int __devinit snd_nm256_probe(struct pci_dev *pci,
case NM_BLACKLISTED:
printk(KERN_INFO "nm256: The device is blacklisted. Loading stopped\n");
return -ENODEV;
case NM_RESET_WORKAROUND_2:
reset_workaround_2[dev] = 1;
/* Fall-through */
case NM_RESET_WORKAROUND:
reset_workaround[dev] = 1;
break;
@ -1632,6 +1644,11 @@ static int __devinit snd_nm256_probe(struct pci_dev *pci,
chip->reset_workaround = 1;
}
if (reset_workaround_2[dev]) {
snd_printdd(KERN_INFO "nm256: reset_workaround_2 activated\n");
chip->reset_workaround_2 = 1;
}
if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
(err = snd_nm256_mixer(chip)) < 0) {
snd_card_free(card);