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| author |   Kumar, Mahesh <mahesh1.kumar@intel.com> | 2017-08-17 19:15:28 +0530 |
|---|---|---|
| committer |   Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2017-09-07 13:41:10 +0200 |
| commit | 2503a0fef214ddadfdf5844d62453591de35586f (patch) | |
| tree | c7fc5c0a64031ca04e4f235277d1671de89de8ac /drivers/gpu/drm/i915/i915_reg.h | |
| parent | drm/i915/gen9+: Add has_ipc flag in device info structure (diff) | |
| download | linux-dev-2503a0fef214ddadfdf5844d62453591de35586f.tar.xz linux-dev-2503a0fef214ddadfdf5844d62453591de35586f.zip | |
drm/i915/bxt+: Enable IPC support
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)
Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170817134529.2839-8-mahesh1.kumar@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/i915_reg.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 2eff98cdcfad..9a73ea0a3293 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -6949,6 +6949,7 @@ enum { #define DISP_FBC_WM_DIS (1<<15) #define DISP_ARB_CTL2 _MMIO(0x45004) #define DISP_DATA_PARTITION_5_6 (1<<6) +#define DISP_IPC_ENABLE (1<<3) #define DBUF_CTL _MMIO(0x45008) #define DBUF_POWER_REQUEST (1<<31) #define DBUF_POWER_STATE (1<<30) |