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drm/i915/kbl+: Enable IPC only for symmetric memory configurations

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IPC may cause underflows if not used with dual channel symmetric
memory configuration. Disable IPC for non symmetric configurations in
affected platforms.
Display WA #1141

Changes Since V1:
 - Re-arrange the code.
 - update wrapper to return if memory is symmetric (Rodrigo)

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180824093225.12598-6-mahesh1.kumar@intel.com
This commit is contained in:
Mahesh Kumar
2018-08-24 15:02:25 +05:30
committed by Rodrigo Vivi
parent f361912aa9
commit 8a6c544763
3 changed files with 28 additions and 5 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
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@@ -1956,6 +1956,7 @@ struct drm_i915_private {
I915_DRAM_RANK_DUAL
} rank;
u32 bandwidth_kbps;
bool symmetric_memory;
} dram_info;
struct i915_runtime_pm runtime_pm;