From: afaerber@suse.de (=?UTF-8?B?QW5kcmVhcyBGw6RyYmVy?=) Date: Sat, 02 Aug 2014 18:05:15 +0200 Subject: [PATCH v6 00/10] ARM: dts: exynos: Prepare Spring In-Reply-To: <53DCE40F.10809@gmail.com> References: <1406940750-15880-1-git-send-email-afaerber@suse.de> <53DC4E41.4050200@collabora.co.uk> <53DCBC84.8080600@suse.de> <53DCE40F.10809@gmail.com> Message-ID: <53DD0C3B.1000506@suse.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Am 02.08.2014 15:13, schrieb Tomasz Figa: > On 02.08.2014 12:25, Andreas F?rber wrote: >> One thing I've wondered is whether we should put status = "disabled" on >> the dp node with some comment, since it's known not to work as is (but >> better having the data here than leaving it out, I believe). > > Does the DP node itself need more data to work or just some external > things are missing? If the former then probably status = "disabled" > should be set, otherwise "okay" is fine if provided data are enough to > probe the Exynos DP driver. Support for ps8622 eDP/LVDS bridge has not yet landed in the drm tree. The latest patch series V6 adds a "bridge" property to /dp-controller. It further requires a simple-panel node and a node for the ps8622: http://www.spinics.net/lists/linux-samsung-soc/msg35089.html >> Of course if either of you has input on the discussions on the drm >> bridge/panel series V6 [1] for how to enable non-simplefb display and >> iommus, that would be valuable. > > Support for Exynos IOMMU is being worked on right now and patches adding > DT support from Marek Szyprowski should show up on the lists in very > near future. Okay, good to hear. > However I think you don't strictly need IOMMU to get > non-simplefb display, as CMA can be used to allocate contiguous memory. I do have CMA enabled, but it wasn't working without iommu patches either. Machine booted, and display had backlight but stayed black. CONFIG_CMA=y # CONFIG_CMA_DEBUG is not set CONFIG_DMA_CMA=y CONFIG_CMA_SIZE_MBYTES=64 CONFIG_CMA_SIZE_SEL_MBYTES=y # CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set # CONFIG_CMA_SIZE_SEL_MIN is not set # CONFIG_CMA_SIZE_SEL_MAX is not set CONFIG_CMA_ALIGNMENT=8 CONFIG_CMA_AREAS=7 Ajay has reported the same patches working on his Skate. Regards, Andreas >> [1] http://www.spinics.net/lists/linux-samsung-soc/msg35274.html -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imend?rffer; HRB 16746 AG N?rnberg