[Intel-gfx] [PATCH 7/8] drm/i915/bxt+: Enable IPC support

[Maarten Lankhorst]

Op 18-07-17 om 14:49 schreef Mahesh Kumar:
> From: "Kumar, Mahesh" <mahesh1.kumar at intel.com>
>
> This patch adds IPC support. This patch also enables IPC in all supported
> platforms based on has_ipc flag.
> IPC (Isochronous Priority Control) is the hardware feature, which
> dynamically controls the memory read priority of Display.
>
> When IPC is enabled, plane read requests are sent at high priority until
> filling above the transition watermark, then the requests are sent at
> lower priority until dropping below the level 0 watermark.
> The lower priority requests allow other memory clients to have better
> memory access. When IPC is disabled, all plane read requests are sent at
> high priority.
>
> Changes since V1:
>  - Remove commandline parameter to disable ipc
>  - Address Paulo's comments
> Changes since V2:
>  - Address review comments
>  - Set ipc_enabled flag
> Changes since V3:
>  - move ipc_enabled flag assignment inside intel_ipc_enable function
> Changes since V4:
>  - Re-enable IPC after suspend/resume
> Changes since V5:
>  - Enable IPC for all gen >=9 except SKL
> Changes since V6:
>  - fix commit msg
>  - after resume program IPC based on SW state.
> Changes since V7:
>  - Modify IPC support check based on HAS_IPC macro (suggested by Chris)
Much better, for all patches without comments..

Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>