Commit 47530cf4 authored by John W. Linville's avatar John W. Linville Committed by Jaroslav Kysela
Browse files

[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: default avatarJohn W. Linville <linville@tuxdriver.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent d44c39ac

sound/pci/nm256/nm256.c

+20 −3
Original line number Diff line number Diff line
@@ -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. */
@@ -1199,9 +1203,12 @@ snd_nm256_ac97_reset(ac97_t *ac97) 
		/* Dell latitude LS will lock up by this */

		snd_nm256_writeb(chip, 0x6cc, 0x87);

	}

	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 */

static int __devinit
@@ -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);

CRA Git | Maintained and supported by SUSTech CRA and CCSE