[Intel-gfx] [PATCH 4/5] drm/i915/mtl: Synchronize i915/BIOS on C6 enabling

[Umesh Nerlige Ramappa]

On Thu, Mar 16, 2023 at 01:25:48PM -0700, Radhakrishna Sripada wrote:
>From: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
>
>If BIOS enables/disables C6, i915 should do the same. Also, retain
>this value across driver reloads. This is needed only for MTL as
>of now due to an existing bug in OA which needs C6 disabled for
>it to function. BIOS behavior is also different across platforms
>in terms of how C6 is enabled.
>
>v2: Review comments (Umesh)
>v3: Cache the C6 enable value for all MTL. The OA WA is needed only
>for A/B step, but we don't need to check for that here.
>v4: Rename to mtl_check_bios_c6_setup()
>
>Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
>Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>

This one's already pushed with the MTL OA series.

Regards,
Umesh