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@vger.kernel.org Signed-off-by: Hans de Goede hdegoede@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);