linux-kernel - Re: [PATCH] drm/atomic: Use drm_drv_uses_atomic

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Date:   Mon, 17 Sep 2018 15:08:10 -0400
From:   Sean Paul <sean@...rly.run>
To:     Lyude Paul <lyude@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...ll.ch>, stable@...r.kernel.org,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/atomic: Use drm_drv_uses_atomic_modeset() for
 debugfs creation

On Mon, Sep 17, 2018 at 01:37:33PM -0400, Lyude Paul wrote:
> As pointed out by Daniel Vetter, we should be usinng
> drm_drv_uses_atomic_modeset() for determining whether or not we want to
> make the debugfs nodes for atomic instead of checking DRIVER_ATOMIC, as
> the former isn't an accurate representation of whether or not the driver
> is actually using atomic modesetting internally (even though it might
> not be exposing atomic capabilities).
> 
> Signed-off-by: Lyude Paul <lyude@...hat.com>

Reviewed-by: Sean Paul <seanpaul@...omium.org>

> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: stable@...r.kernel.org
> ---
>  drivers/gpu/drm/drm_atomic.c  | 2 +-
>  drivers/gpu/drm/drm_debugfs.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 3eb061e11e2e..018fcdb353d2 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -2067,7 +2067,7 @@ static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
>  	struct drm_connector *connector;
>  	struct drm_connector_list_iter conn_iter;
>  
> -	if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
> +	if (!drm_drv_uses_atomic_modeset(dev))
>  		return;
>  
>  	list_for_each_entry(plane, &config->plane_list, head) {
> diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
> index 6f28fe58f169..373bd4c2b698 100644
> --- a/drivers/gpu/drm/drm_debugfs.c
> +++ b/drivers/gpu/drm/drm_debugfs.c
> @@ -151,7 +151,7 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
>  		return ret;
>  	}
>  
> -	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
> +	if (drm_drv_uses_atomic_modeset(dev)) {
>  		ret = drm_atomic_debugfs_init(minor);
>  		if (ret) {
>  			DRM_ERROR("Failed to create atomic debugfs files\n");
> -- 
> 2.17.1
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS