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ALSA: hda-intel - add special 'hwio' model to bypass initialization 

Using the 'model=hwio' option, the driver bypasses any codec
initialization and the reset procedure for codecs is also
bypassed. This mode is usefull to enable direct access using
hwdep interface (using hdaverb or hda-analyzer tools) and
retain codec setup from BIOS.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2010-03-26 10:28:46 +01:00
parent 306ff3e473
commit cd508fe58b
3 changed files with 25 additions and 10 deletions
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5
Documentation/sound/alsa/HD-Audio.txt
View File

@ -196,6 +196,11 @@ generic parser regardless of the codec. Usually the codec-specific
parser is much better than the generic parser (as now). Thus this
option is more about the debugging purpose.
Another special meaning has 'model=hwio'. For this model, the driver
bypasses any codec initialization and the reset procedure for codecs
is also bypassed. This mode is usefull to enable direct access using
hwdep interface (using hdaverb or hda-analyzer tools) and retain
codec setup from BIOS.
Speaker and Headphone Output
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

10
sound/pci/hda/hda_codec.c
View File

@ -609,11 +609,15 @@ int /*__devinit*/ snd_hda_bus_new(struct snd_card *card,
}
EXPORT_SYMBOL_HDA(snd_hda_bus_new);
#define is_hwio_config(codec) \
(codec->modelname && !strcmp(codec->modelname, "hwio"))
#ifdef CONFIG_SND_HDA_GENERIC
#define is_generic_config(codec) \
(codec->modelname && !strcmp(codec->modelname, "generic"))
((codec->modelname && !strcmp(codec->modelname, "generic")) || \
is_hwio_config(codec))
#else
#define is_generic_config(codec) 0
#define is_generic_config(codec) \
is_hwio_config(codec)
#endif
#ifdef MODULE
@ -1113,6 +1117,8 @@ int snd_hda_codec_configure(struct hda_codec *codec)
}
if (is_generic_config(codec)) {
if (is_hwio_config(codec))
goto patched;
err = snd_hda_parse_generic_codec(codec);
goto patched;
}

20
sound/pci/hda/hda_intel.c
View File

@ -858,10 +858,13 @@ static void azx_power_notify(struct hda_bus *bus);
#endif
/* reset codec link */
static int azx_reset(struct azx *chip)
static int azx_reset(struct azx *chip, int full_reset)
{
int count;
if (!full_reset)
goto __skip;
/* clear STATESTS */
azx_writeb(chip, STATESTS, STATESTS_INT_MASK);
@ -887,6 +890,7 @@ static int azx_reset(struct azx *chip)
/* Brent Chartrand said to wait >= 540us for codecs to initialize */
msleep(1);
__skip:
/* check to see if controller is ready */
if (!azx_readb(chip, GCTL)) {
snd_printd(SFX "azx_reset: controller not ready!\n");
@ -998,13 +1002,13 @@ static void azx_stream_stop(struct azx *chip, struct azx_dev *azx_dev)
/*
* reset and start the controller registers
*/
static void azx_init_chip(struct azx *chip)
static void azx_init_chip(struct azx *chip, int full_reset)
{
if (chip->initialized)
return;
/* reset controller */
azx_reset(chip);
azx_reset(chip, full_reset);
/* initialize interrupts */
azx_int_clear(chip);
@ -1348,7 +1352,7 @@ static void azx_bus_reset(struct hda_bus *bus)
bus->in_reset = 1;
azx_stop_chip(chip);
azx_init_chip(chip);
azx_init_chip(chip, 1);
#ifdef CONFIG_PM
if (chip->initialized) {
int i;
@ -1422,7 +1426,7 @@ static int __devinit azx_codec_create(struct azx *chip, const char *model)
* get back to the sanity state.
*/
azx_stop_chip(chip);
azx_init_chip(chip);
azx_init_chip(chip, 1);
}
}
}
@ -2112,7 +2116,7 @@ static void azx_power_notify(struct hda_bus *bus)
}
}
if (power_on)
azx_init_chip(chip);
azx_init_chip(chip, 1);
else if (chip->running && power_save_controller &&
!bus->power_keep_link_on)
azx_stop_chip(chip);
@ -2182,7 +2186,7 @@ static int azx_resume(struct pci_dev *pci)
azx_init_pci(chip);
if (snd_hda_codecs_inuse(chip->bus))
azx_init_chip(chip);
azx_init_chip(chip, 1);
snd_hda_resume(chip->bus);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
@ -2573,7 +2577,7 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
/* initialize chip */
azx_init_pci(chip);
azx_init_chip(chip);
azx_init_chip(chip, model[dev] == NULL || strcmp(model[dev], "hwio"));
/* codec detection */
if (!chip->codec_mask) {