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Message-ID: <20141118083234.GZ25711@phenom.ffwll.local>
Date:	Tue, 18 Nov 2014 09:32:34 +0100
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>,
	Daniel Vetter <daniel@...ll.ch>,
	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>, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-api@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, dianders@...omium.org,
	marcheu@...omium.org, dbehr@...omium.org, olof@...om.net,
	djkurtz@...omium.org, cf@...k-chips.com, xxm@...k-chips.com,
	huangtao@...k-chips.com, kever.yang@...k-chips.com,
	yxj@...k-chips.com, xw@...k-chips.com
Subject: Re: [PATCH v12 1/3] drm: rockchip: Add basic drm driver

On Tue, Nov 18, 2014 at 04:00:29PM +0800, Mark Yao wrote:
> From: Mark yao <mark.yao@...k-chips.com>
> 
> This patch adds the basic structure of a DRM Driver for Rockchip Socs.
> 
> Signed-off-by: Mark Yao <mark.yao@...k-chips.com>
> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
> Acked-by: Daniel Vetter <daniel@...ll.ch>
> Reviewed-by: Rob Clark <robdclark@...il.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
> 
> Changes in v3:
> - change "crtc->fb" to "crtc->primary-fb"
> Adviced by Daniel Vetter
> - init cursor plane with universal api, remove unnecessary cursor set,move 
> 
> Changes in v4:
> Adviced by David Herrmann
> - remove drm_platform_*() usage, use register drm device directly.

Minor fixup for that part below.

[snip]

> +static int rockchip_drm_bind(struct device *dev)
> +{
> +	struct drm_device *drm;
> +	int ret;
> +
> +	drm = drm_dev_alloc(&rockchip_drm_driver, dev);
> +	if (!drm)
> +		return -ENOMEM;
> +
> +	ret = drm_dev_set_unique(drm, "%s", dev_name(dev));
> +	if (ret)
> +		goto err_free;

Please call rockchip_drm_load here directly and don't put it as the ->load
function into the driver vtable. The point of the alloc/register split is
that the driver can be completely set up _before_ we register anything.
But for backwards compat and historical reasons ->load is called somewhere
in the middle (so that you could access the minor nodes if needed, since
some drivers do that).

Cheers, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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