[PATCH] drm/i915/gvt: enabled pipe A as default for vgpu

[Zhenyu Wang]

Is this for Fixes: 7e6059020894 ("drm/i915/gvt: enabled pipe A default on creating vgpu")?

On 2017.12.05 14:45:32 +0800, Xiaolin Zhang wrote:
> observed igt drv_module_reload test case failure on 4.15.0
> rc2 kernel with panic due to no active pipe available.
> 
> the gpu will reset during unload/load and make pipe config reg
> lost which can cause kernel panic issue happen.
> 
> this patch is to move pipe enabling to emulate_mointor_status_chagne
> to handle vgpu reset case as well.
> 
> Signed-off-by: Xiaolin Zhang <xiaolin.zhang at intel.com>
> ---
>  drivers/gpu/drm/i915/gvt/display.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
> index 09185036bac8..1de5919dd043 100644
> --- a/drivers/gpu/drm/i915/gvt/display.c
> +++ b/drivers/gpu/drm/i915/gvt/display.c
> @@ -266,6 +266,8 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
>  	/* Clear host CRT status, so guest couldn't detect this host CRT. */
>  	if (IS_BROADWELL(dev_priv))
>  		vgpu_vreg(vgpu, PCH_ADPA) &= ~ADPA_CRT_HOTPLUG_MONITOR_MASK;
> +
> +	vgpu_vreg(vgpu, PIPECONF(PIPE_A)) |= PIPECONF_ENABLE;
>  }
>  
>  static void clean_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num)
> @@ -282,7 +284,6 @@ static void clean_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num)
>  static int setup_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num,
>  				    int type, unsigned int resolution)
>  {
> -	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
>  	struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);
>  
>  	if (WARN_ON(resolution >= GVT_EDID_NUM))
> @@ -308,7 +309,7 @@ static int setup_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num,
>  	port->type = type;
>  
>  	emulate_monitor_status_change(vgpu);
> -	vgpu_vreg(vgpu, PIPECONF(PIPE_A)) |= PIPECONF_ENABLE;
> +
>  	return 0;
>  }
>  
> -- 
> 2.14.2
> 
> _______________________________________________
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> intel-gvt-dev at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gvt-dev

-- 
Open Source Technology Center, Intel ltd.

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