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Date:	Fri, 19 Sep 2014 20:11:58 +0900
From:	Joonyoung Shim <jy0922.shim@...sung.com>
To:	Andrzej Hajda <a.hajda@...sung.com>,
	Inki Dae <inki.dae@...sung.com>
Cc:	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	David Airlie <airlied@...ux.ie>,
	Kukjin Kim <kgene.kim@...sung.com>,
	"open list:DRM DRIVERS FOR E..." <dri-devel@...ts.freedesktop.org>,
	"moderated list:ARM/S5P EXYNOS AR..." 
	<linux-samsung-soc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>, drake@...lessm.com,
	daniel@...ll.ch, m.szyprowski@...sung.com
Subject: Re: [PATCH] drm/exynos: switch to universal plane API

Hi,

On 09/19/2014 07:54 PM, Andrzej Hajda wrote:
> On 09/19/2014 03:02 AM, Joonyoung Shim wrote:
>> Hi Andrzej,
>>
>> On 09/18/2014 10:17 PM, Andrzej Hajda wrote:
>>> The patch replaces legacy functions
>>> drm_plane_init() / drm_crtc_init() with
>>> drm_universal_plane_init() and drm_crtc_init_with_planes().
>>> It allows to replace fake primary plane with the real one.
>>>
>>> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
>>> ---
>>> Hi Inki,
>>>
>>> I have tested this patch with trats board, it looks OK.
>>> As a side effect it should solve fb refcounting issues
>>> reported by me and Daniel Drake.
>>>
>>> Regards
>>> Andrzej
>>> ---
>>>  drivers/gpu/drm/exynos/exynos_drm_crtc.c  | 63 ++++++++++++++++---------------
>>>  drivers/gpu/drm/exynos/exynos_drm_drv.c   |  5 ++-
>>>  drivers/gpu/drm/exynos/exynos_drm_plane.c | 17 +++++----
>>>  drivers/gpu/drm/exynos/exynos_drm_plane.h |  3 +-
>>>  4 files changed, 47 insertions(+), 41 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
>>> index b68e58f..d2f713e 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
>>> @@ -32,7 +32,6 @@ enum exynos_crtc_mode {
>>>   * Exynos specific crtc structure.
>>>   *
>>>   * @drm_crtc: crtc object.
>>> - * @drm_plane: pointer of private plane object for this crtc
>>>   * @manager: the manager associated with this crtc
>>>   * @pipe: a crtc index created at load() with a new crtc object creation
>>>   *	and the crtc object would be set to private->crtc array
>>> @@ -46,7 +45,6 @@ enum exynos_crtc_mode {
>>>   */
>>>  struct exynos_drm_crtc {
>>>  	struct drm_crtc			drm_crtc;
>>> -	struct drm_plane		*plane;
>>>  	struct exynos_drm_manager	*manager;
>>>  	unsigned int			pipe;
>>>  	unsigned int			dpms;
>>> @@ -94,12 +92,12 @@ static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
>>>  
>>>  	exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
>>>  
>>> -	exynos_plane_commit(exynos_crtc->plane);
>>> +	exynos_plane_commit(crtc->primary);
>>>  
>>>  	if (manager->ops->commit)
>>>  		manager->ops->commit(manager);
>>>  
>>> -	exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_ON);
>>> +	exynos_plane_dpms(crtc->primary, DRM_MODE_DPMS_ON);
>>>  }
>>>  
>>>  static bool
>>> @@ -123,10 +121,9 @@ exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
>>>  {
>>>  	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
>>>  	struct exynos_drm_manager *manager = exynos_crtc->manager;
>>> -	struct drm_plane *plane = exynos_crtc->plane;
>>> +	struct drm_framebuffer *fb = crtc->primary->fb;
>>>  	unsigned int crtc_w;
>>>  	unsigned int crtc_h;
>>> -	int ret;
>>>  
>>>  	/*
>>>  	 * copy the mode data adjusted by mode_fixup() into crtc->mode
>>> @@ -134,29 +131,21 @@ exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
>>>  	 */
>>>  	memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
>>>  
>>> -	crtc_w = crtc->primary->fb->width - x;
>>> -	crtc_h = crtc->primary->fb->height - y;
>>> +	crtc_w = fb->width - x;
>>> +	crtc_h = fb->height - y;
>>>  
>>>  	if (manager->ops->mode_set)
>>>  		manager->ops->mode_set(manager, &crtc->mode);
>>>  
>>> -	ret = exynos_plane_mode_set(plane, crtc, crtc->primary->fb, 0, 0, crtc_w, crtc_h,
>>> -				    x, y, crtc_w, crtc_h);
>>> -	if (ret)
>>> -		return ret;
>>> -
>>> -	plane->crtc = crtc;
>>> -	plane->fb = crtc->primary->fb;
>>> -	drm_framebuffer_reference(plane->fb);
>>> -
>>> -	return 0;
>>> +	return exynos_plane_mode_set(crtc->primary, crtc, fb, 0, 0,
>>> +				     crtc_w, crtc_h, x, y, crtc_w, crtc_h);
>>>  }
>>>  
>>>  static int exynos_drm_crtc_mode_set_commit(struct drm_crtc *crtc, int x, int y,
>>>  					  struct drm_framebuffer *old_fb)
>>>  {
>>>  	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
>>> -	struct drm_plane *plane = exynos_crtc->plane;
>>> +	struct drm_framebuffer *fb = crtc->primary->fb;
>>>  	unsigned int crtc_w;
>>>  	unsigned int crtc_h;
>>>  	int ret;
>>> @@ -167,11 +156,11 @@ static int exynos_drm_crtc_mode_set_commit(struct drm_crtc *crtc, int x, int y,
>>>  		return -EPERM;
>>>  	}
>>>  
>>> -	crtc_w = crtc->primary->fb->width - x;
>>> -	crtc_h = crtc->primary->fb->height - y;
>>> +	crtc_w = fb->width - x;
>>> +	crtc_h = fb->height - y;
>>>  
>>> -	ret = exynos_plane_mode_set(plane, crtc, crtc->primary->fb, 0, 0, crtc_w, crtc_h,
>>> -				    x, y, crtc_w, crtc_h);
>>> +	ret = exynos_plane_mode_set(crtc->primary, crtc, fb, 0, 0,
>>> +				    crtc_w, crtc_h, x, y, crtc_w, crtc_h);
>>>  	if (ret)
>>>  		return ret;
>>>  
>>> @@ -279,6 +268,7 @@ static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
>>>  
>>>  	private->crtc[exynos_crtc->pipe] = NULL;
>>>  
>>> +	crtc->primary->funcs->destroy(crtc->primary);
>> This is unnecessary.
> 
> The question is how these object should be destroyed. In current code
> crtc is destroyed in fimd_unbind and it is called before
> drm_mode_config_cleanup
> which destroys all planes.
> In such case primary plane will stay with .crtc pointing to non-existing
> crtc.
> Maybe performing crtcs cleanup after planes cleanup is better solution???

I think it's wrong to call destroy function of crtc in fimd_unbind, all
objects should be destroyed by drm_mode_config_cleanup except error
cases while initializing.

> 
>>
>>>  	drm_crtc_cleanup(crtc);
>>>  	kfree(exynos_crtc);
>>>  }
>>> @@ -304,8 +294,7 @@ static int exynos_drm_crtc_set_property(struct drm_crtc *crtc,
>>>  			exynos_drm_crtc_commit(crtc);
>>>  			break;
>>>  		case CRTC_MODE_BLANK:
>>> -			exynos_plane_dpms(exynos_crtc->plane,
>>> -					  DRM_MODE_DPMS_OFF);
>>> +			exynos_plane_dpms(crtc->primary, DRM_MODE_DPMS_OFF);
>>>  			break;
>>>  		default:
>>>  			break;
>>> @@ -351,8 +340,10 @@ static void exynos_drm_crtc_attach_mode_property(struct drm_crtc *crtc)
>>>  int exynos_drm_crtc_create(struct exynos_drm_manager *manager)
>>>  {
>>>  	struct exynos_drm_crtc *exynos_crtc;
>>> +	struct drm_plane *plane;
>>>  	struct exynos_drm_private *private = manager->drm_dev->dev_private;
>>>  	struct drm_crtc *crtc;
>>> +	int ret;
>>>  
>>>  	exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
>>>  	if (!exynos_crtc)
>>> @@ -364,11 +355,11 @@ int exynos_drm_crtc_create(struct exynos_drm_manager *manager)
>>>  	exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
>>>  	exynos_crtc->manager = manager;
>>>  	exynos_crtc->pipe = manager->pipe;
>>> -	exynos_crtc->plane = exynos_plane_init(manager->drm_dev,
>>> -				1 << manager->pipe, true);
>>> -	if (!exynos_crtc->plane) {
>>> -		kfree(exynos_crtc);
>>> -		return -ENOMEM;
>>> +	plane = exynos_plane_init(manager->drm_dev, 1 << manager->pipe,
>>> +				  DRM_PLANE_TYPE_PRIMARY);
>>> +	if (IS_ERR(plane)) {
>>> +		ret = PTR_ERR(plane);
>>> +		goto err_plane;
>>>  	}
>>>  
>>>  	manager->crtc = &exynos_crtc->drm_crtc;
>>> @@ -376,12 +367,22 @@ int exynos_drm_crtc_create(struct exynos_drm_manager *manager)
>>>  
>>>  	private->crtc[manager->pipe] = crtc;
>>>  
>>> -	drm_crtc_init(manager->drm_dev, crtc, &exynos_crtc_funcs);
>>> +	ret = drm_crtc_init_with_planes(manager->drm_dev, crtc, plane, NULL,
>>> +					&exynos_crtc_funcs);
>>> +	if (ret < 0)
>>> +		goto err_crtc;
>>> +
>>>  	drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
>>>  
>>>  	exynos_drm_crtc_attach_mode_property(crtc);
>>>  
>>>  	return 0;
>>> +
>>> +err_crtc:
>>> +	plane->funcs->destroy(plane);
>>> +err_plane:
>>> +	kfree(exynos_crtc);
>>> +	return ret;
>>>  }
>>>  
>>>  int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int pipe)
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
>>> index 9b00e4e..a439452 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
>>> @@ -86,8 +86,9 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
>>>  		struct drm_plane *plane;
>>>  		unsigned long possible_crtcs = (1 << MAX_CRTC) - 1;
>>>  
>>> -		plane = exynos_plane_init(dev, possible_crtcs, false);
>>> -		if (!plane)
>>> +		plane = exynos_plane_init(dev, possible_crtcs,
>>> +					  DRM_PLANE_TYPE_OVERLAY);
>>> +		if (IS_ERR(plane))
>>>  			goto err_mode_config_cleanup;
>>>  	}
>>>  
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
>>> index 8371cbd..15e37a0 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
>>> @@ -139,6 +139,8 @@ int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
>>>  			overlay->crtc_x, overlay->crtc_y,
>>>  			overlay->crtc_width, overlay->crtc_height);
>>>  
>>> +	plane->crtc = crtc;
>>> +
>> OK, then we can remove same code from exynos_update_plane().
> 
> Right.
> 
>>
>> One more, plane->crtc is NULL before mode_set or setplane so it's
>> problem if call plane->funcs->destroy with plane->crtc == NULL.
>> We need checking plane->crtc is NULL in exynos_disable_plane().
> 
> I can simply add checks, but why we allow the plane with NULL crtc to be
> enabled?
> 

I mean plane disable case, not enable case.

Thanks.
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