[patch 16/26] [ALSA] nm256: reset workaround for Latitude CSx

Greg KH
2005-12-13T08:32:38Z

[-- Attachment #1: nm256-reset-workaround-for-latitude-csx.patch --]
[-- Type: text/plain, Size: 4354 bytes --]

-stable review patch. If anyone has any objections, please let us know.

------------------
From: John W. Linville <linville@tuxdriver.com>

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/sound/pci/nm256/nm256.c b/sound/pci/nm256/nm256.c
index ebfa38b..d0da9a5 100644
---
sound/pci/nm256/nm256.c | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)

--- linux-2.6.14.3.orig/sound/pci/nm256/nm256.c
+++ linux-2.6.14.3/sound/pci/nm256/nm256.c
@@ -62,6 +62,7 @@ static int buffer_top[SNDRV_CARDS] = {[0
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
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 */
@@ -1542,7 +1549,7 @@ 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 */
@@ -1551,6 +1558,8 @@ static struct nm256_quirk nm256_quirks[]
{ .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 */
};

@@ -1582,6 +1591,9 @@ static int __devinit snd_nm256_probe(str
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;
@@ -1638,6 +1650,11 @@ static int __devinit snd_nm256_probe(str
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);

--