drm/i915/gvt: Refine virtual reset function

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during the emulation of virtual reset:
1. only reset the engine related mmio ending with MMIO
   offset Master_IRQ, not include display stuff.

2. fences are not required to set default
   value as well to prevent screen flicking.

this will fix the issue of Guest screen hang while running
Force tdr in Linux guest.

v2:
- only reset the engine related mmio. (Zhenyu & Zhiyuan)
v3:
- IMR/Ring mode registers are not save/restored. (Changbin)
v4:
- redefine the MMIO reset offset for easy understanding. (Zhenyu)
- pvinfo can be reset. (Zhenyu)
v5:
- add more comments for mmio reset. (Zhenyu)

Cc: Changbin Du <changbin.du@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Lv zhiyuan <zhiyuan.lv@intel.com>
Cc: Zhang Yulei <yulei.zhang@intel.com>
Signed-off-by: fred gao <fred.gao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

...

This commit is contained in:

fred gao 2017-05-25 15:33:52 +08:00 • committed by Zhenyu Wang

parent 0811fa6630

commit 615c16a9d8

3 changed files with 28 additions and 11 deletions

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28

drivers/gpu/drm/i915/gvt/mmio.c

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2

drivers/gpu/drm/i915/gvt/mmio.h

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9

drivers/gpu/drm/i915/gvt/vgpu.c

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