On Mon, Nov 05, 2018 at 12:02:53PM +0100, Takashi Iwai wrote:
The commit 37a3a98ef601 ("ALSA: hda - Enable runtime PM only for discrete GPU") added a new ops gpu_bound to be called when GPU gets bound. The patch overlooked, however, that vga_switcheroo_enable() is called only once at GPU is bound. When an audio client is registered after that point, it would miss the gpu_bound call. This leads to the unexpected lack of runtime PM in HD-audio side.
For addressing that regression, just call gpu_bound callback manually at vga_switcheroo_register_audio_client() when the GPU was already bound.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201615 Fixes: 37a3a98ef601 ("ALSA: hda - Enable runtime PM only for discrete GPU") Cc: stable@vger.kernel.org Signed-off-by: Takashi Iwai tiwai@suse.de
drivers/gpu/vga/vga_switcheroo.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c index cf2a18571d48..a132c37d7334 100644 --- a/drivers/gpu/vga/vga_switcheroo.c +++ b/drivers/gpu/vga/vga_switcheroo.c @@ -380,6 +380,9 @@ int vga_switcheroo_register_audio_client(struct pci_dev *pdev, mutex_unlock(&vgasr_mutex); return -EINVAL; }
/* notify if GPU has been already bound */if (ops->gpu_bound)ops->gpu_bound(pdev, id);
If the audio client registers before vga_switcheroo becomes enabled, ->gpu_bound will be executed twice. AFAICS this only causes a minor cosmetic issue, namely that dev_info() is called twice for blacklisted devices in set_default_power_save(). This could be eliminated by amending the if-condition with "&& vgasr_priv.active". Since this is only minor, up to you if you want to respin.
Either way, Reviewed-by: Lukas Wunner lukas@wunner.de