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Date:	Fri, 19 Sep 2014 10:03:09 +0800
From:	yaozq <>
To:	Mark yao <>,,
	Boris BREZILLON <>,
	David Airlie <>,
	Rob Clark <>,
	Rob Herring <>,
	Pawel Moll <>,
	Mark Rutland <>,
	Ian Campbell <>,
	Kumar Gala <>,
	Randy Dunlap <>,
	Grant Likely <>,
	Greg Kroah-Hartman <>,
	John Stultz <>,
	Rom Lemarchand <>,,,,,,,,,,,,,,,,,,,
Subject: Re: [PATCH v2 1/5] drm/rockchip: Add basic drm driver

On 2014年09月18日 22:53, Daniel Vetter wrote:
> 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 <>
>>> ---
>>> 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
I see, drm_mode_cursor_universal is nice, I would test and use it.

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