ALSA: intel8x0: implement ac97_clock whitelist
The AC97 clock detection is not accurate in some cases. This patch adds an initial whitelist for audio devices gathered from RedHat's bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=441087 As a side effect, white-listing might speedup kernel booting (AC97 clock measuring code is not activated). Signed-off-by: Jaroslav Kysela <perex@perex.cz>
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@ -83,7 +83,7 @@ MODULE_PARM_DESC(index, "Index value for Intel i8x0 soundcard.");
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module_param(id, charp, 0444);
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MODULE_PARM_DESC(id, "ID string for Intel i8x0 soundcard.");
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module_param(ac97_clock, int, 0444);
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MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (0 = auto-detect).");
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MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (0 = whitelist + auto-detect, 1 = force autodetect).");
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module_param(ac97_quirk, charp, 0444);
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MODULE_PARM_DESC(ac97_quirk, "AC'97 workaround for strange hardware.");
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module_param(buggy_semaphore, bool, 0444);
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@ -2692,6 +2692,38 @@ static void __devinit intel8x0_measure_ac97_clock(struct intel8x0 *chip)
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snd_ac97_update_power(chip->ac97[0], AC97_PCM_FRONT_DAC_RATE, 0);
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}
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struct intel8x0_clock_list {
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unsigned short subvendor;
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unsigned short subdevice;
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unsigned int rate;
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};
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static struct intel8x0_clock_list intel8x0_clock_list[] __devinitdata = {
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{ 0x0e11, 0x008a, 41000 }, /* Analog Devices AD1885 */
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{ 0x1028, 0x00be, 44100 }, /* Analog Devices AD1885 */
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{ 0x1028, 0x0177, 48000 }, /* Analog Devices AD1980 */
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{ 0x1043, 0x80f3, 48000 }, /* Analog Devices AD1985 */
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{ 0x0000, 0x0000, 00000 } /* terminator */
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};
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static int __devinit intel8x0_in_clock_list(struct intel8x0 *chip)
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{
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struct pci_dev *pci = chip->pci;
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struct intel8x0_clock_list *wl;
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for (wl = intel8x0_clock_list; wl->subvendor; wl++) {
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if (wl->subvendor == pci->subsystem_vendor &&
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wl->subdevice == pci->subsystem_device) {
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printk(KERN_INFO "intel8x0: white list rate for %04x:%04x is %i\n",
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pci->subsystem_vendor,
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pci->subsystem_device, wl->rate);
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chip->ac97_bus->clock = wl->rate;
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return 1;
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}
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}
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return 0;
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}
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#ifdef CONFIG_PROC_FS
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static void snd_intel8x0_proc_read(struct snd_info_entry * entry,
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struct snd_info_buffer *buffer)
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@ -3087,8 +3119,14 @@ static int __devinit snd_intel8x0_probe(struct pci_dev *pci,
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"%s with %s at irq %i", card->shortname,
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snd_ac97_get_short_name(chip->ac97[0]), chip->irq);
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if (! ac97_clock)
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intel8x0_measure_ac97_clock(chip);
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if (ac97_clock == 0 || ac97_clock == 1) {
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if (ac97_clock == 0) {
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if (intel8x0_in_clock_list(chip) == 0)
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intel8x0_measure_ac97_clock(chip);
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} else {
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intel8x0_measure_ac97_clock(chip);
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}
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}
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if ((err = snd_card_register(card)) < 0) {
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snd_card_free(card);
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