[PATCH v6 4/4] drm/i915/fbdev: do not create fbdev if HPD is suspended

[Imre Deak]

On Fri, Jul 22, 2022 at 02:51:43PM +0200, Andrzej Hajda wrote:
> In case of deferred FB setup core can try to create new
> framebuffer. Disallow it if hpd_suspended flag is set.
> 
> Signed-off-by: Andrzej Hajda <andrzej.hajda at intel.com>

Reviewed-by: Imre Deak <imre.deak at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_fbdev.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 94ddc0f34fde64..fb8dbd532b9e05 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -210,6 +210,12 @@ static int intelfb_create(struct drm_fb_helper *helper,
>  	struct drm_i915_gem_object *obj;
>  	int ret;
>  
> +	mutex_lock(&ifbdev->hpd_lock);
> +	ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
> +	mutex_unlock(&ifbdev->hpd_lock);
> +	if (ret)
> +		return ret;
> +
>  	if (intel_fb &&
>  	    (sizes->fb_width > intel_fb->base.width ||
>  	     sizes->fb_height > intel_fb->base.height)) {
> -- 
> 2.25.1
>