[PATCH 4.19 361/361] vga_switcheroo: Fix missing gpu_bound call at audio client registration

[Greg Kroah-Hartman]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@xxxxxxx>

commit fc09ab7a767394f9ecdad84ea6e85d68b83c8e21 upstream.

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@xxxxxxxxxxxxxxx>
Reviewed-by: Lukas Wunner <lukas@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/vga/vga_switcheroo.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -380,6 +380,9 @@ int vga_switcheroo_register_audio_client
 			mutex_unlock(&vgasr_mutex);
 			return -EINVAL;
 		}
+		/* notify if GPU has been already bound */
+		if (ops->gpu_bound)
+			ops->gpu_bound(pdev, id);
 	}
 	mutex_unlock(&vgasr_mutex);