[PATCH] drm/radeon: add quirk for d3 delay during switcheroo poweron for apple macbooks

[Alex Deucher]

On Mon, Jan 7, 2013 at 9:18 AM, Maarten Lankhorst
<maarten.lankhorst at canonical.com> wrote:
> vga-switcheroo with apple-gmux does not switch correctly on my system. The PCI
> configuration space is not restored correctly, resulting in MSI not working after switch.
>
> Only useful item in dmesg is:
>
> [   33.922807] radeon 0000:01:00.0: Refused to change power state, currently in D3
>
> I did some testing, dumping the difference in ms between first succesful switch
> from D3 to D0, and it seems that there is slightly more than 20 ms difference when
> the device is re-enabled through vga-switcheroo.
>
> So bump the re-enable d3 delay to 20 ms to handle this, which fixes msi not working
> on my system after switcheroo-ing. Default d3_delay value is PCI_PM_D3_WAIT, 10 ms.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>

Looks good. Added to my -fixes queue.

Alex