linux-kernel - Re: [PATCH v2 1/5] drm/rockchip: Add basic drm driver

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Message-ID: <20140918145354.GB15734@phenom.ffwll.local>
Date:	Thu, 18 Sep 2014 16:53:54 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Mark yao <mark.yao@...k-chips.com>
Cc:	heiko@...ech.de,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	David Airlie <airlied@...il.com>,
	Rob Clark <robdclark@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Rom Lemarchand <romlem@...gle.com>, linux-doc@...r.kernel.org,
	kever.yang@...k-chips.com, dri-devel@...ts.freedesktop.org,
	dianders@...omium.org, xjq@...k-chips.com, zyw@...k-chips.com,
	cym@...k-chips.com, linux-rockchip@...ts.infradead.org,
	kfx@...k-chips.com, wxt@...k-chips.com, huangtao@...k-chips.com,
	devicetree@...r.kernel.org, yxj@...k-chips.com,
	marcheu@...omium.org, xxm@...k-chips.com, xw@...k-chips.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	cf@...k-chips.com
Subject: Re: [PATCH v2 1/5] drm/rockchip: Add basic drm driver

On Thu, Sep 18, 2014 at 04:52:14PM +0200, Daniel Vetter wrote:
> On Thu, Sep 18, 2014 at 05:36:31PM +0800, Mark yao wrote:
> > This patch adds the basic structure of a DRM Driver for Rockchip Socs.
> > 
> > Signed-off-by: Mark yao <mark.yao@...k-chips.com>
> > ---
> > Changes in v2:
> > - use the component framework to defer main drm driver probe
> >   until all VOP devices have been probed.
> > - use dma-mapping API with ARM_DMA_USE_IOMMU, create dma mapping by
> >   master device and each vop device can shared the drm dma mapping.
> > - use drm_crtc_init_with_planes and drm_universal_plane_init.
> > - remove unnecessary middle layers.
> > - add cursor set, move funcs to rockchip drm crtc.
> > - use vop reset at first init
> > - reference framebuffer when used and unreference when swap out vop
> > 
> 
> > +static const struct drm_crtc_funcs rockchip_crtc_funcs = {
> > +	.set_config = drm_crtc_helper_set_config,
> > +	.page_flip = rockchip_drm_crtc_page_flip,
> > +	.destroy = rockchip_drm_crtc_destroy,
> > +	.cursor_set = vop_crtc_cursor_set,
> > +	.cursor_move = vop_crtc_cursor_move,
> 
> If you expose your cursor plane as a universal you don't need to implement
> these two cursor functions at all. Actually the core never calls them, see
> drm_mode_cursor_universal. So if you want to expose cursors, please use
> universal cursor plane support (like i915).
> 
> In general that's how new drivers should expose cursors since without
> universal planes support cursors will not be supported with the atomic
> ioctl. Since your cursor code just calls the relevant plane functions that
> should even simplify your driver ;-)

Actually you already initialize with cursor universal planes, so all this
code can simply be removed.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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