On Thu, 22 Feb 2018 13:31:28 +0100, 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 an 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
Changes in RFC v2: -Only use the blacklist if the power_save module-option is not explicitly set by the user
sound/pci/hda/hda_intel.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index c71dcacea807..7c588b0d6c96 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, @@ -2197,6 +2213,7 @@ 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 err;
@@ -2278,6 +2295,16 @@ static int azx_probe_continue(struct azx *chip)
chip->running = 1; azx_add_card_list(chip);
- if (power_save == -1) {
power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;q = snd_pci_quirk_lookup(chip->pci, power_save_blacklist);if (q && power_save) {dev_info(chip->card->dev, "device %04x:%04x is on the power_save blacklist, forcing power_save to 0\n",q->subvendor, q->subdevice);power_save = 0;}- }
This won't work always, as there can be multiple HD-audio controllers. e.g. Haswell and Broadwell usually probe the HDMI controller at first. Then it doesn't match with the blacklist, thus power_save is set to 1, and the second PCI device probe also takes 1 even if it's matching with the blacklist.
thanks,
Takashi