[alsa-devel] [RFC v3] ALSA: hda: Add a power_save blacklist

[Hans de Goede]

Hi,

On 22-02-18 14:20, Hans de Goede wrote:
> On some boards setting power_save to a non 0 value leads to clicking /
> popping sounds when ever we enter/leave powersaving mode. Ideally we would
> figure out how to avoid these sounds, but that is not always feasible.
> 
> This commit adds a blacklist for devices where powersaving is known to
> cause problems and disables it on these devices.
> 
> Note I tried to put this blacklist in userspace first:
> https://github.com/systemd/systemd/pull/8128
> 
> But the systemd maintainers rightfully pointed out that it would be
> impossible to then later remove entries once we actually find a way to
> make power-saving work on listed boards without issues. Having this list
> in the kernel will allow removal of the blacklist entry in the same commit
> which fixes the clicks / plops.
> 
> The blacklist only applies to the default power_save module-option value,
> if a user explicitly sets the module-option then the blacklist is not
> used.
> 
> BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1525104
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=198611
> Cc: stable at vger.kernel.org
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>

This has been tested now, so this may be applied now,
assuming people are happy with this version.

Let me know if you want me to re-submit as a non-RFC.

Regards,

Hans




> ---
> Changes in RFC v2:
> -Only use the blacklist if the power_save module-option is not explicitly
>   set by the user
> 
> Changes in RFC v2:
> -Fix logic to work on boards with more then 1 HDA device
> ---
>   sound/pci/hda/hda_intel.c | 33 +++++++++++++++++++++++++++++++--
>   1 file changed, 31 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index c71dcacea807..9d67b6b0ec95 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -181,7 +181,7 @@ static const struct kernel_param_ops param_ops_xint = {
>   };
>   #define param_check_xint param_check_int
>   
> -static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
> +static int power_save = -1;
>   module_param(power_save, xint, 0644);
>   MODULE_PARM_DESC(power_save, "Automatic power-saving timeout "
>   		 "(in second, 0 = disable).");
> @@ -2186,6 +2186,22 @@ static int azx_probe(struct pci_dev *pci,
>   	return err;
>   }
>   
> +/* On some boards setting power_save to a non 0 value leads to clicking /
> + * popping sounds when ever we enter/leave powersaving mode. Ideally we would
> + * figure out how to avoid these sounds, but that is not always feasible.
> + * So we keep a list of devices where we disable powersaving as its known
> + * to causes problems on these devices.
> + */
> +static struct snd_pci_quirk power_save_blacklist[] = {
> +	/* https://bugzilla.redhat.com/show_bug.cgi?id=1525104 */
> +	SND_PCI_QUIRK(0x1849, 0x0c0c, "Asrock B85M-ITX", 0),
> +	/* https://bugzilla.redhat.com/show_bug.cgi?id=1525104 */
> +	SND_PCI_QUIRK(0x1043, 0x8733, "Asus Prime X370-Pro", 0),
> +	/* https://bugzilla.kernel.org/show_bug.cgi?id=198611 */
> +	SND_PCI_QUIRK(0x17aa, 0x2227, "Lenovo X1 Carbon 3rd Gen", 0),
> +	{}
> +};
> +
>   /* number of codec slots for each chipset: 0 = default slots (i.e. 4) */
>   static unsigned int azx_max_codecs[AZX_NUM_DRIVERS] = {
>   	[AZX_DRIVER_NVIDIA] = 8,
> @@ -2197,7 +2213,9 @@ static int azx_probe_continue(struct azx *chip)
>   	struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
>   	struct hdac_bus *bus = azx_bus(chip);
>   	struct pci_dev *pci = chip->pci;
> +	const struct snd_pci_quirk *q;
>   	int dev = chip->dev_index;
> +	int val;
>   	int err;
>   
>   	hda->probe_continued = 1;
> @@ -2278,7 +2296,18 @@ static int azx_probe_continue(struct azx *chip)
>   
>   	chip->running = 1;
>   	azx_add_card_list(chip);
> -	snd_hda_set_power_save(&chip->bus, power_save * 1000);
> +
> +	val = power_save;
> +	if (val == -1) {
> +		val = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
> +		q = snd_pci_quirk_lookup(chip->pci, power_save_blacklist);
> +		if (q && val) {
> +			dev_info(chip->card->dev, "device %04x:%04x is on the power_save blacklist, forcing power_save to 0\n",
> +				 q->subvendor, q->subdevice);
> +			val = 0;
> +		}
> +	}
> +	snd_hda_set_power_save(&chip->bus, val * 1000);
>   	if (azx_has_pm_runtime(chip) || hda->use_vga_switcheroo)
>   		pm_runtime_put_autosuspend(&pci->dev);
>   
>