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ALSA: hda - Allow forcibly enabling/disabling snoop 

User can pass snoop option to enable/disable the snoop behavior, but
currently azx_check_snoop_available() always turns it off for some
devices.  For better debuggability, change the parameter as bint, and
allow user to enable/disable forcibly the snoop when specified via the
module option.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
hifive-unleashed-5.1
Takashi Iwai 2014-11-25 12:54:16 +01:00
parent 37e661ee10
commit 7c7320157a
1 changed files with 18 additions and 15 deletions
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33
sound/pci/hda/hda_intel.c
View File

@ -196,8 +196,8 @@ MODULE_PARM_DESC(align_buffer_size,
"Force buffer and period sizes to be multiple of 128 bytes.");
#ifdef CONFIG_X86
static bool hda_snoop = true;
module_param_named(snoop, hda_snoop, bool, 0444);
static int hda_snoop = -1;
module_param_named(snoop, hda_snoop, bint, 0444);
MODULE_PARM_DESC(snoop, "Enable/disable snooping");
#else
#define hda_snoop true
@ -1370,29 +1370,33 @@ static void check_msi(struct azx *chip)
/* check the snoop mode availability */
static void azx_check_snoop_available(struct azx *chip)
{
bool snoop = chip->snoop;
int snoop = hda_snoop;
if (snoop >= 0) {
dev_info(chip->card->dev, "Force to %s mode by module option\n",
snoop ? "snoop" : "non-snoop");
chip->snoop = snoop;
return;
}
snoop = true;
if (azx_get_snoop_type(chip) == AZX_SNOOP_TYPE_NONE &&
chip->driver_type == AZX_DRIVER_VIA) {
/* force to non-snoop mode for a new VIA controller
* when BIOS is set
*/
if (snoop) {
u8 val;
pci_read_config_byte(chip->pci, 0x42, &val);
if (!(val & 0x80) && chip->pci->revision == 0x30)
snoop = false;
}
u8 val;
pci_read_config_byte(chip->pci, 0x42, &val);
if (!(val & 0x80) && chip->pci->revision == 0x30)
snoop = false;
}
if (chip->driver_caps & AZX_DCAPS_SNOOP_OFF)
snoop = false;
if (snoop != chip->snoop) {
dev_info(chip->card->dev, "Force to %s mode\n",
snoop ? "snoop" : "non-snoop");
chip->snoop = snoop;
}
chip->snoop = snoop;
if (!snoop)
dev_info(chip->card->dev, "Force to non-snoop mode\n");
}
static void azx_probe_work(struct work_struct *work)
@ -1452,7 +1456,6 @@ static int azx_create(struct snd_card *card, struct pci_dev *pci,
check_probe_mask(chip, dev);
chip->single_cmd = single_cmd;
chip->snoop = hda_snoop;
azx_check_snoop_available(chip);
if (bdl_pos_adj[dev] < 0) {