ALSA: hda: Allow HDA to be runtime suspended when dGPU is not bound to a driver

BugLink: https://bugs.launchpad.net/bugs/1840835
Nvidia proprietary driver doesn't support runtime power management, so
when a user only wants to use the integrated GPU, it's a common practice
to let dGPU not to bind any driver, and let its upstream port to be
runtime suspended. At the end of runtime suspension the port uses
platform power management to disable power through _OFF method of power
resource, which is listed by _PR3.

After commit b516ea586d71 ("PCI: Enable NVIDIA HDA controllers"), when
the dGPU comes with an HDA function, the HDA won't be suspended if the
dGPU is unbound, so the power resource can't be turned off by its
upstream port driver.

Commit 37a3a98ef601 ("ALSA: hda - Enable runtime PM only for
discrete GPU") only allows HDA to be runtime suspended once GPU is
bound, to keep APU's HDA working.

However, HDA on dGPU isn't that useful if dGPU is not bound to any
driver.  So let's relax the runtime suspend requirement for dGPU's HDA
function, to disable the power source to save lots of power.

BugLink: https://bugs.launchpad.net/bugs/1840835
Fixes: b516ea586d71 ("PCI: Enable NVIDIA HDA controllers")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20191018073848.14590-2-kai.heng.feng@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
(backported from commit bacd861452d2be86a4df341b12e32db7dac8021e linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 783f9a9c40ecdbceb036db6edf69de485ef26508..2f92709c4b268ac49f19b7ffc103e95614296d5c 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1281,11 +1281,17 @@ static void init_vga_switcheroo(struct azx *chip)
 {
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        struct pci_dev *p = get_bound_vga(chip->pci);
+       struct pci_dev *parent;
        if (p) {
                dev_info(chip->card->dev,
                         "Handle vga_switcheroo audio client\n");
                hda->use_vga_switcheroo = 1;
-               hda->need_eld_notify_link = 1; /* cleared in gpu_bound op */
+
+               /* cleared in either gpu_bound op or codec probe, or when its
+                * upstream port has _PR3 (i.e. dGPU).
+                */
+               parent = pci_upstream_bridge(p);
+               hda->need_eld_notify_link = parent ? !pci_pr3_present(parent) : 1;
                chip->driver_caps |= AZX_DCAPS_PM_RUNTIME;
                pci_dev_put(p);
        }