Re: [PATCH 5/5] drm/i915/gvt: Fix vfio_edid issue for BXT/APL

[Greg KH <greg@kroah.com>]

On Wed, Mar 17, 2021 at 10:55:04AM +0800, Colin Xu wrote:
> commit 4ceb06e7c336f4a8d3f3b6ac9a4fea2e9c97dc07 upstream
> 
> BXT/APL has different isr/irr/hpd regs compared with other GEN9. If not
> setting these regs bits correctly according to the emulated monitor
> (currently a DP on PORT_B), although gvt still triggers a virtual HPD
> event, the guest driver won't detect a valid HPD pulse thus no full
> display detection will be executed to read the updated EDID.
> 
> With this patch, the vfio_edid is enabled again on BXT/APL, which is
> previously disabled.
> 
> Fixes: 642403e3599e ("drm/i915/gvt: Temporarily disable vfio_edid for BXT/APL")
> Signed-off-by: Colin Xu <colin.xu@intel.com>
> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
> Link: http://patchwork.freedesktop.org/patch/msgid/20201201060329.142375-1-colin.xu@intel.com
> Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
> (cherry picked from commit 4ceb06e7c336f4a8d3f3b6ac9a4fea2e9c97dc07)
> Signed-off-by: Colin Xu <colin.xu@intel.com>
> Cc: <stable@vger.kernel.org> # 5.4.y
> ---
>  drivers/gpu/drm/i915/gvt/display.c | 83 ++++++++++++++++++++++--------
>  drivers/gpu/drm/i915/gvt/vgpu.c    |  2 +-
>  2 files changed, 62 insertions(+), 23 deletions(-)

Can you also send a backport for 5.10.y for this patch as it is needed
there as well?

thanks,

greg k-h