[ALSA] Fix NM256 hard lock up
Modules: NM256 driver
Treat the nm256 mixer as a write-only device so as to avoid hangs on
initialisation.
Signed-off-by: Florian Schlichting <Florian.Schlichting@gmx.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/nm256/nm256.c b/sound/pci/nm256/nm256.c
index 3a3ba6f..cc297ab 100644
--- a/sound/pci/nm256/nm256.c
+++ b/sound/pci/nm256/nm256.c
@@ -228,6 +228,7 @@
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 */
+ unsigned int in_resume: 1;
int mixer_base; /* register offset of ac97 mixer */
int mixer_status_offset; /* offset of mixer status reg. */
@@ -242,6 +243,7 @@
struct nm256_stream streams[2];
struct snd_ac97 *ac97;
+ unsigned short *ac97_regs; /* register caches, only for valid regs */
struct snd_pcm *pcm;
@@ -1153,23 +1155,63 @@
return 0;
}
+/*
+ * Initial register values to be written to the AC97 mixer.
+ * While most of these are identical to the reset values, we do this
+ * so that we have most of the register contents cached--this avoids
+ * reading from the mixer directly (which seems to be problematic,
+ * probably due to ignorance).
+ */
+
+struct initialValues {
+ unsigned short reg;
+ unsigned short value;
+};
+
+static struct initialValues nm256_ac97_init_val[] =
+{
+ { AC97_MASTER, 0x8000 },
+ { AC97_HEADPHONE, 0x8000 },
+ { AC97_MASTER_MONO, 0x8000 },
+ { AC97_PC_BEEP, 0x8000 },
+ { AC97_PHONE, 0x8008 },
+ { AC97_MIC, 0x8000 },
+ { AC97_LINE, 0x8808 },
+ { AC97_CD, 0x8808 },
+ { AC97_VIDEO, 0x8808 },
+ { AC97_AUX, 0x8808 },
+ { AC97_PCM, 0x8808 },
+ { AC97_REC_SEL, 0x0000 },
+ { AC97_REC_GAIN, 0x0B0B },
+ { AC97_GENERAL_PURPOSE, 0x0000 },
+ { AC97_3D_CONTROL, 0x8000 },
+ { AC97_VENDOR_ID1, 0x8384 },
+ { AC97_VENDOR_ID2, 0x7609 },
+};
+
+static int nm256_ac97_idx(unsigned short reg)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++)
+ if (nm256_ac97_init_val[i].reg == reg)
+ return i;
+ return -1;
+}
+
/*
+ * some nm256 easily crash when reading from mixer registers
+ * thus we're treating it as a write-only mixer and cache the
+ * written values
*/
static unsigned short
snd_nm256_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
struct nm256 *chip = ac97->private_data;
- int res;
+ int idx = nm256_ac97_idx(reg);
- if (reg >= 128)
+ if (idx < 0)
return 0;
-
- if (! snd_nm256_ac97_ready(chip))
- return 0;
- res = snd_nm256_readw(chip, chip->mixer_base + reg);
- /* Magic delay. Bleah yucky. */
- msleep(1);
- return res;
+ return chip->ac97_regs[idx];
}
/*
@@ -1180,8 +1222,12 @@
{
struct nm256 *chip = ac97->private_data;
int tries = 2;
+ int idx = nm256_ac97_idx(reg);
u32 base;
+ if (idx < 0)
+ return;
+
base = chip->mixer_base;
snd_nm256_ac97_ready(chip);
@@ -1190,12 +1236,32 @@
while (tries-- > 0) {
snd_nm256_writew(chip, base + reg, val);
msleep(1); /* a little delay here seems better.. */
- if (snd_nm256_ac97_ready(chip))
+ if (snd_nm256_ac97_ready(chip)) {
+ /* successful write: set cache */
+ chip->ac97_regs[idx] = val;
return;
+ }
}
snd_printd("nm256: ac97 codec not ready..\n");
}
+/* static resolution table */
+static struct snd_ac97_res_table nm256_res_table[] = {
+ { AC97_MASTER, 0x1f1f },
+ { AC97_HEADPHONE, 0x1f1f },
+ { AC97_MASTER_MONO, 0x001f },
+ { AC97_PC_BEEP, 0x001f },
+ { AC97_PHONE, 0x001f },
+ { AC97_MIC, 0x001f },
+ { AC97_LINE, 0x1f1f },
+ { AC97_CD, 0x1f1f },
+ { AC97_VIDEO, 0x1f1f },
+ { AC97_AUX, 0x1f1f },
+ { AC97_PCM, 0x1f1f },
+ { AC97_REC_GAIN, 0x0f0f },
+ { } /* terminator */
+};
+
/* initialize the ac97 into a known state */
static void
snd_nm256_ac97_reset(struct snd_ac97 *ac97)
@@ -1213,6 +1279,16 @@
snd_nm256_writeb(chip, 0x6cc, 0x80);
snd_nm256_writeb(chip, 0x6cc, 0x0);
}
+ if (! chip->in_resume) {
+ int i;
+ for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++) {
+ /* preload the cache, so as to avoid even a single
+ * read of the mixer regs
+ */
+ snd_nm256_ac97_write(ac97, nm256_ac97_init_val[i].reg,
+ nm256_ac97_init_val[i].value);
+ }
+ }
}
/* create an ac97 mixer interface */
@@ -1221,32 +1297,25 @@
{
struct snd_ac97_bus *pbus;
struct snd_ac97_template ac97;
- int i, err;
+ int err;
static struct snd_ac97_bus_ops ops = {
.reset = snd_nm256_ac97_reset,
.write = snd_nm256_ac97_write,
.read = snd_nm256_ac97_read,
};
- /* looks like nm256 hangs up when unexpected registers are touched... */
- static int mixer_regs[] = {
- AC97_MASTER, AC97_HEADPHONE, AC97_MASTER_MONO,
- AC97_PC_BEEP, AC97_PHONE, AC97_MIC, AC97_LINE, AC97_CD,
- AC97_VIDEO, AC97_AUX, AC97_PCM, AC97_REC_SEL,
- AC97_REC_GAIN, AC97_GENERAL_PURPOSE, AC97_3D_CONTROL,
- /*AC97_EXTENDED_ID,*/
- AC97_VENDOR_ID1, AC97_VENDOR_ID2,
- -1
- };
+
+ chip->ac97_regs = kcalloc(sizeof(short),
+ ARRAY_SIZE(nm256_ac97_init_val), GFP_KERNEL);
+ if (! chip->ac97_regs)
+ return -ENOMEM;
if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
return err;
memset(&ac97, 0, sizeof(ac97));
ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
- ac97.limited_regs = 1;
- for (i = 0; mixer_regs[i] >= 0; i++)
- set_bit(mixer_regs[i], ac97.reg_accessed);
ac97.private_data = chip;
+ ac97.res_table = nm256_res_table;
pbus->no_vra = 1;
err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
if (err < 0)
@@ -1331,6 +1400,7 @@
int i;
/* Perform a full reset on the hardware */
+ chip->in_resume = 1;
pci_restore_state(pci);
pci_enable_device(pci);
snd_nm256_init_chip(chip);
@@ -1348,6 +1418,7 @@
}
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+ chip->in_resume = 0;
return 0;
}
#endif /* CONFIG_PM */
@@ -1372,6 +1443,7 @@
free_irq(chip->irq, chip);
pci_disable_device(chip->pci);
+ kfree(chip->ac97_regs);
kfree(chip);
return 0;
}