Re: [PATCH v3 4/8] drm/i915: Disable framebuffer compression for i915 driver in VM

Tvrtko Ursulin
2014-12-12T13:13:09Z

On 11/13/2014 12:02 PM, Yu Zhang wrote:
> Framebuffer compression is disabled when driver detects it's
> running in a Intel GVT-g enlightened VM, because FBC is not
> emulated and there is no stolen memory for a vGPU.
>
> v2:
> take Chris' comments:
> - move the code into intel_update_fbc()
>
> Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
> Signed-off-by: Jike Song <jike.song@intel.com>
> Signed-off-by: Zhiyuan Lv <zhiyuan.lv@intel.com>
> ---
> drivers/gpu/drm/i915/intel_pm.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 7a69eba..3bc5d93 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -544,6 +544,10 @@ void intel_update_fbc(struct drm_device *dev)
> return;
> }
>
> + /* disable framebuffer compression in vGPU */
> + if (intel_vgpu_active(dev))
> + i915.enable_fbc = 0;
> +
> /*
> * If FBC is already on, we just have to verify that we can
> * keep it that way...
>

Looks like you'll need to rebase this one, I see no intel_update_fbc in
my tree. :(

Regards,

Tvrtko