在 2018/7/16 22:16, Lukas Wunner 写道:
On Mon, Jul 16, 2018 at 03:52:45PM +0800, Hui Wang wrote:
On 2018???07???16??? 14:06, Jim Qu wrote:
On modern laptop, there are more and more platforms
have two GPUs, and each of them maybe have audio codec
for HDMP/DP output. For some dGPU which is no output,
audio codec usually is disabled.
In currect HDA audio driver, it will set all codec as
VGA_SWITCHEROO_DIS, the audio which is binded to UMA
will be suspended if user use debugfs to control power
In HDA driver side, it is difficult to know which GPU
the audio has bound to. So set the bound gpu pci dev
to vgaswitchreoo, the correct audio id will be set in
vgaswitchreoo enable function.
Signed-off-by: Jim Qu <jim...@amd.com>
Is it possible to send this patch to <sta...@vger.kernel.org> as well, then
we will know that it is safe to backport this patch to the linux kernels
with different version.
For which hardware do you want it in stable kernels?
This patch pertains to manual power control, which is only used on the
MacBook Pro by default. And there are no MacBook Pros with AMD APUs.
On all other hardware, users have to specify "amdgpu.runpm=0" on the
command line to see any benefit from this patch. Also, manual power
control will likely be removed once we get runtime PM working with
muxed systems (such as the MacBook Pro).
The patch idea will deal with the issues 1) manual power control after
v4.17. 2) driver control before v4.17. As we know current a lot of
mainstream OS, such like ubuntu 16.04.4 (kernel is v4.15), ubuntu
18.04(kernel is v4.15), RHEL7.x (kernel is 3.1x).
BTW, I believe you will see more and more products with AMD next
generation of APUs in the near future.
Thanks
JimQu
Lukas
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