[Intel-gfx] [v2] drm/i915/fbdev: Enable late fbdev initial configuration

[Paul Menzel]

Dear Jose,


On 04/19/18 01:41, Souza, Jose wrote:
> If the initial fbdev configuration(intel_fbdev_initial_config()) runs and

Nit: Space before (.

> there still no sink connected it will cause
> drm_fb_helper_initial_config() to return 0 as no error happened(but
> internally the return is -EAGAIN).

Nit: Space before (.

> Because no framebuffer was allocated, when a sink is connected
> intel_fbdev_output_poll_changed() will not execute
> drm_fb_helper_hotplug_event() that would trigger another try to do the
> initial fbdev configuration.
> 
> So here allowing drm_fb_helper_hotplug_event() to be executed when there
> is not frambebuffer allocated and fbdev was not setup yet.

s/not/no/
s/setup/set up/

> This issue also happens when a MST DP sink is connected since boot, as
> the MST topology is discovered in parallel if intel_fbdev_initial_config()
> is executed before the first sink MST is discovered it will cause this
> same issue.
> 
> This is a follow up patch of

follow-up

> https://patchwork.freedesktop.org/patch/196089/
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104158
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104425
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
> 
> Changes from v1:
> - not creating a dump framebuffer anymore, instead just allowing
> drm_fb_helper_hotplug_event() to execute when fbdev is not setup yet.

s/setup/set up/

>   drivers/gpu/drm/i915/intel_fbdev.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
> index 7d41d139341b..e9e02b58b7be 100644
> --- a/drivers/gpu/drm/i915/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/intel_fbdev.c
> @@ -807,7 +807,7 @@ void intel_fbdev_output_poll_changed(struct drm_device *dev)
>   		return;
>   
>   	intel_fbdev_sync(ifbdev);
> -	if (ifbdev->vma)
> +	if (ifbdev->vma || ifbdev->helper.deferred_setup)
>   		drm_fb_helper_hotplug_event(&ifbdev->helper);
>   }
>   

Tested-by: Paul Menzel <pmenzel at molgen.mpg.de>


Kind regards,

Paul

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