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Subject: Re: [PATCH 1/4] drm/simple_kms_helper: Add {enable|disable}_vblank
 callback support
From:   Oleksandr Andrushchenko <andr2000@gmail.com>
To:     dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Cc:     daniel.vetter@intel.com, gustavo@padovan.org, airlied@linux.ie,
        seanpaul@chromium.org,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
References: <1518425574-32671-1-git-send-email-andr2000@gmail.com>
 <1518425574-32671-2-git-send-email-andr2000@gmail.com>
Message-ID: <00b01a2d-ad16-e171-f52f-88fba2896386@gmail.com>
Date:   Mon, 19 Feb 2018 11:11:23 +0200
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On 02/12/2018 10:52 AM, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
>
> If simple_kms_helper based driver needs to work with vblanks,
> then it has to provide drm_driver.{enable|disable}_vblank callbacks,
> because drm_simple_kms_helper.drm_crtc_funcs does not provide any.
> At the same time drm_driver.{enable|disable}_vblank callbacks
> are marked as deprecated and shouldn't be used by new drivers.
>
> Fix this by extending drm_simple_kms_helper.drm_crtc_funcs
> to provide the missing callbacks.
>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
> ---
>   drivers/gpu/drm/drm_simple_kms_helper.c | 24 ++++++++++++++++++++++++
>   include/drm/drm_simple_kms_helper.h     | 18 ++++++++++++++++++
>   2 files changed, 42 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> index 9d3f6b70812c..9ca8a4a59b74 100644
> --- a/drivers/gpu/drm/drm_simple_kms_helper.c
> +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> @@ -77,6 +77,28 @@ static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
>   	.atomic_disable = drm_simple_kms_crtc_disable,
>   };
>   
> +static int drm_simple_kms_crtc_enable_vblank(struct drm_crtc *crtc)
> +{
> +	struct drm_simple_display_pipe *pipe;
> +
> +	pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
> +	if (!pipe->funcs || !pipe->funcs->enable_vblank)
> +		return 0;
> +
> +	return pipe->funcs->enable_vblank(pipe);
> +}
> +
> +static void drm_simple_kms_crtc_disable_vblank(struct drm_crtc *crtc)
> +{
> +	struct drm_simple_display_pipe *pipe;
> +
> +	pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
> +	if (!pipe->funcs || !pipe->funcs->disable_vblank)
> +		return;
> +
> +	pipe->funcs->disable_vblank(pipe);
> +}
> +
>   static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = {
>   	.reset = drm_atomic_helper_crtc_reset,
>   	.destroy = drm_crtc_cleanup,
> @@ -84,6 +106,8 @@ static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = {
>   	.page_flip = drm_atomic_helper_page_flip,
>   	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
>   	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> +	.enable_vblank = drm_simple_kms_crtc_enable_vblank,
> +	.disable_vblank = drm_simple_kms_crtc_disable_vblank,
>   };
>   
>   static int drm_simple_kms_plane_atomic_check(struct drm_plane *plane,
> diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
> index 6d9adbb46293..79567826b099 100644
> --- a/include/drm/drm_simple_kms_helper.h
> +++ b/include/drm/drm_simple_kms_helper.h
> @@ -93,6 +93,24 @@ struct drm_simple_display_pipe_funcs {
>   	 */
>   	void (*cleanup_fb)(struct drm_simple_display_pipe *pipe,
>   			   struct drm_plane_state *plane_state);
> +
> +	/**
> +	 * @enable_vblank:
> +	 *
> +	 * Optional, called by &drm_crtc_funcs.enable_vblank. Please read
> +	 * the documentation for the &drm_crtc_funcs.enable_vblank hook for
> +	 * more details.
> +	 */
> +	int (*enable_vblank)(struct drm_simple_display_pipe *pipe);
> +
> +	/**
> +	 * @disable_vblank:
> +	 *
> +	 * Optional, called by &drm_crtc_funcs.disable_vblank. Please read
> +	 * the documentation for the &drm_crtc_funcs.disable_vblank hook for
> +	 * more details.
> +	 */
> +	void (*disable_vblank)(struct drm_simple_display_pipe *pipe);
>   };
>   
>   /**