From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754037AbaKRNVm (ORCPT ); Tue, 18 Nov 2014 08:21:42 -0500 Received: from down.free-electrons.com ([37.187.137.238]:58208 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753375AbaKRNVk (ORCPT ); Tue, 18 Nov 2014 08:21:40 -0500 Date: Tue, 18 Nov 2014 14:21:30 +0100 From: Boris Brezillon To: Daniel Vetter Cc: Mark Yao , heiko@sntech.de, 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 , devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-api@vger.kernel.org, linux-rockchip@lists.infradead.org, dianders@chromium.org, marcheu@chromium.org, dbehr@chromium.org, olof@lixom.net, djkurtz@chromium.org, cf@rock-chips.com, xxm@rock-chips.com, huangtao@rock-chips.com, kever.yang@rock-chips.com, yxj@rock-chips.com, xw@rock-chips.com Subject: Re: [PATCH v12 1/3] drm: rockchip: Add basic drm driver Message-ID: <20141118142130.6c12ab50@bbrezillon> In-Reply-To: <20141118083234.GZ25711@phenom.ffwll.local> References: <1416297587-18959-1-git-send-email-mark.yao@rock-chips.com> <1416297629-19024-1-git-send-email-mark.yao@rock-chips.com> <20141118083234.GZ25711@phenom.ffwll.local> X-Mailer: Claws Mail 3.9.3 (GTK+ 2.24.23; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Daniel, On Tue, 18 Nov 2014 09:32:34 +0100 Daniel Vetter wrote: > On Tue, Nov 18, 2014 at 04:00:29PM +0800, Mark Yao wrote: > > From: Mark yao > > > > This patch adds the basic structure of a DRM Driver for Rockchip Socs. > > > > Signed-off-by: Mark Yao > > Signed-off-by: Daniel Kurtz > > Acked-by: Daniel Vetter > > Reviewed-by: Rob Clark > > --- > > 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). I tried to do the same in the atmel-hlcdc DRM driver, but I need the primary drm_minor to register the connectors (see this kernel backtrace [1]), which means I either initialize the connector in the wrong place (currently part of the drm load process), or I just can't call atmel_hlcdc_dc_load before registering the drm device... Regards, Boris [1]http://code.bulix.org/fi7trt-87436 -- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com