[Intel-gfx] [PATCH v2 05/15] drm/atmel-hlcdc: Use per-plane rotation property

[Daniel Vetter]

On Wed, Aug 10, 2016 at 01:52:45PM +0200, Boris Brezillon wrote:
> On Wed, 10 Aug 2016 14:41:52 +0300
> Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> 
> > On Wed, Aug 10, 2016 at 11:25:03AM +0200, Boris Brezillon wrote:
> > > On Wed, 10 Aug 2016 12:09:41 +0300
> > > Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> > >   
> > > > On Wed, Aug 10, 2016 at 10:35:22AM +0200, Boris Brezillon wrote:  
> > > > > Hi Ville,
> > > > > 
> > > > > On Fri, 22 Jul 2016 18:47:01 +0300
> > > > > ville.syrjala at linux.intel.com wrote:
> > > > >     
> > > > > > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > > > > 
> > > > > > The global mode_config.rotation_property is going away, switch over to
> > > > > > per-plane rotation_property.
> > > > > > 
> > > > > > v2: Propagate error upwards (Boris)
> > > > > > 
> > > > > > Cc: Boris Brezillon <boris.brezillon at free-electrons.com>
> > > > > > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > > > > ---
> > > > > >  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 37 +++++++++++++------------
> > > > > >  1 file changed, 20 insertions(+), 17 deletions(-)
> > > > > > 
> > > > > > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> > > > > > index f3350c80704d..ee9bd7a938c3 100644
> > > > > > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> > > > > > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> > > > > > @@ -883,9 +883,9 @@ static int atmel_hlcdc_plane_atomic_get_property(struct drm_plane *p,
> > > > > >  	return 0;
> > > > > >  }
> > > > > >  
> > > > > > -static void atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane,
> > > > > > -				const struct atmel_hlcdc_layer_desc *desc,
> > > > > > -				struct atmel_hlcdc_plane_properties *props)
> > > > > > +static int atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane,
> > > > > > +					     const struct atmel_hlcdc_layer_desc *desc,
> > > > > > +					     struct atmel_hlcdc_plane_properties *props)
> > > > > >  {
> > > > > >  	struct regmap *regmap = plane->layer.hlcdc->regmap;
> > > > > >  
> > > > > > @@ -902,10 +902,18 @@ static void atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane,
> > > > > >  				ATMEL_HLCDC_LAYER_GA_MASK);
> > > > > >  	}
> > > > > >  
> > > > > > -	if (desc->layout.xstride && desc->layout.pstride)
> > > > > > -		drm_object_attach_property(&plane->base.base,
> > > > > > -				plane->base.dev->mode_config.rotation_property,
> > > > > > -				BIT(DRM_ROTATE_0));
> > > > > > +	if (desc->layout.xstride && desc->layout.pstride) {
> > > > > > +		int ret;
> > > > > > +
> > > > > > +		ret = drm_plane_create_rotation_property(&plane->base,
> > > > > > +							 BIT(DRM_ROTATE_0),
> > > > > > +							 BIT(DRM_ROTATE_0) |
> > > > > > +							 BIT(DRM_ROTATE_90) |
> > > > > > +							 BIT(DRM_ROTATE_180) |
> > > > > > +							 BIT(DRM_ROTATE_270));
> > > > > > +		if (ret)
> > > > > > +			return ret;
> > > > > > +	}
> > > > > >  
> > > > > >  	if (desc->layout.csc) {
> > > > > >  		/*
> > > > > > @@ -925,6 +933,8 @@ static void atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane,
> > > > > >  			     ATMEL_HLCDC_LAYER_CSC_CFG(&plane->layer, 2),
> > > > > >  			     0x40040890);
> > > > > >  	}
> > > > > > +
> > > > > > +	return 0;
> > > > > >  }
> > > > > >  
> > > > > >  static struct drm_plane_helper_funcs atmel_hlcdc_layer_plane_helper_funcs = {
> > > > > > @@ -1036,7 +1046,9 @@ atmel_hlcdc_plane_create(struct drm_device *dev,
> > > > > >  			     &atmel_hlcdc_layer_plane_helper_funcs);
> > > > > >  
> > > > > >  	/* Set default property values*/
> > > > > > -	atmel_hlcdc_plane_init_properties(plane, desc, props);
> > > > > > +	ret = atmel_hlcdc_plane_init_properties(plane, desc, props);
> > > > > > +	if (ret)
> > > > > > +		return ERR_PTR(ret);    
> > > > > 
> > > > > Shouldn't we call drm_plane_cleanup() here?    
> > > > 
> > > > The other error path doesn't call it either, so I figured no really
> > > > cares anyway.  
> > > 
> > > Because the other error path is before plane initialization.  
> > 
> > There's some stuff being done earlier already, so either that part
> > doesn't need cleaning, or the init/cleanup is somehow asymmetric, or
> > it's just broken.
> 
> devm_ resources are automatically released by the device-model, hence
> the absence of devm_kfree(). atmel_hlcdc_layer_cleanup() should be
> called if drm_universal_plane_init() fails though.

Aside: drm objects are independently refcounting, mostly likely using
devm_ on the underlying physical device for drm objects is a bug. At least
all this stuff looks extremely fishy.
-Daniel

> 
> > Anyways, as my interest in cleaning up this driver
> > is as near zero as can be measured, I think I'll leave all that to
> > someone else to figure out.
> 
> I'm not asking you to fix existing problems, but you're introducing a
> potential new source of leak here.
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch