Hi All,
The following series adds support for a new set of drm helpers called sdrm. It is targeted to ease the implementation of drivers for embedded systems. The basic idea is that instead of handling a comlete drm device in each driver we introduce helpers which take care of the drm device and most of the interfacing with the drm core. Users of these helpers can register crtcs, encoders and connectors as separate devices which reflects the hardware of embedded systems better than a monolithic drm device. The patches are mostly based on the exynos driver. While writing a driver for my devices I realized that I had to duplicate the bulk of this driver, mostly replacing the exynos_ prefixes with imx_ prefixes, hence the idea of creating a common infrastructure for this.
As a testbed driver a i.MX LCDC driver and a Intel (Marvell) PXA2xx driver is included. Both are very simple last-decade-embedded-lcd-controllers. The drivers have been tested with the xf86 modesetting driver, some libdrm tests and a custom kms testing tool. Currently only the base framebuffers are supported, but KMS plane support is definitely on my todo list. The drivers posted here are mostly created for demonstration purpose and to give a template for other drivers, but the motivation for creating this layer was the i.MX5/6 IPU (Image Processing Unit) which has two crts (four on i.MX6), several on-SoC encoders and overlay possibilities. So this layer should not be limited to the real 'simple' cases.
The sdrm patches currently have some limitations, but they should be enough for being useful and to present it to a wider audience. Currently no custom ioctls are supported, basically because I didn't need them yet. Also the pitch for the framebuffers are hardcoded by the sdrm layer, this should be done in the crtc drivers instead. Another thing is that I currently have no idea what might be needed to support IOMMUs, but maybe Thierry can help me out with his Tegra patches ;)
For a more complete branch including board support for a PXA27x based Phytec board see this branch:
git://git.pengutronix.de/git/imx/linux-2.6.git gpu/sdrm-full
Comments very appreciated.
Sascha
The following changes since commit 0034102808e0dbbf3a2394b82b1bb40b5778de9e:
Linux 3.4-rc2 (2012-04-07 18:30:41 -0700)
are available in the git repository at:
git://git.pengutronix.de/git/imx/linux-2.6.git gpu/sdrm
for you to fetch changes up to fc3d0ff4825de998f1fd902184f7df040248d0de:
DRM: add PXA kms simple driver (2012-04-11 17:10:46 +0200)
---------------------------------------------------------------- Philipp Zabel (1): DRM: add PXA kms simple driver
Sascha Hauer (6): drm: remove legacy mode_group handling drm: make gamma_set optional DRM: add sdrm layer for general embedded system support DRM: Add sdrm 1:1 encoder - connector helper DRM: add i.MX kms simple driver ARM i.MX27 pcm038: Add sdrm support
arch/arm/mach-imx/pcm970-baseboard.c | 78 ++- arch/arm/mach-pxa/include/mach/regs-lcd.h | 2 + arch/arm/plat-mxc/include/mach/imxfb.h | 8 +- drivers/gpu/drm/Kconfig | 6 + drivers/gpu/drm/Makefile | 3 + drivers/gpu/drm/drm_crtc.c | 163 ++---- drivers/gpu/drm/drm_pci.c | 8 - drivers/gpu/drm/drm_platform.c | 8 - drivers/gpu/drm/drm_usb.c | 6 - drivers/gpu/drm/imx/Kconfig | 8 + drivers/gpu/drm/imx/Makefile | 1 + drivers/gpu/drm/imx/imx-lcdc-crtc.c | 506 ++++++++++++++++ drivers/gpu/drm/pxa/Kconfig | 12 + drivers/gpu/drm/pxa/Makefile | 1 + drivers/gpu/drm/pxa/pxa-lcdc-crtc.c | 845 +++++++++++++++++++++++++++ drivers/gpu/drm/sdrm/Kconfig | 11 + drivers/gpu/drm/sdrm/Makefile | 5 + drivers/gpu/drm/sdrm/sdrm.c | 904 +++++++++++++++++++++++++++++ drivers/gpu/drm/sdrm/sdrm.h | 57 ++ drivers/gpu/drm/sdrm/sdrm_encon.c | 211 +++++++ drivers/gpu/drm/sdrm/sdrm_encon_dummy.c | 193 ++++++ drivers/gpu/drm/sdrm/sdrm_fb.c | 191 ++++++ drivers/gpu/drm/sdrm/sdrm_fbdev.c | 238 ++++++++ drivers/gpu/drm/sdrm/sdrm_gem.c | 342 +++++++++++ include/drm/drmP.h | 1 - include/drm/drm_crtc.h | 24 +- include/drm/sdrm.h | 102 ++++ include/drm/sdrm_encon.h | 69 +++ 28 files changed, 3831 insertions(+), 172 deletions(-) create mode 100644 drivers/gpu/drm/imx/Kconfig create mode 100644 drivers/gpu/drm/imx/Makefile create mode 100644 drivers/gpu/drm/imx/imx-lcdc-crtc.c create mode 100644 drivers/gpu/drm/pxa/Kconfig create mode 100644 drivers/gpu/drm/pxa/Makefile create mode 100644 drivers/gpu/drm/pxa/pxa-lcdc-crtc.c create mode 100644 drivers/gpu/drm/sdrm/Kconfig create mode 100644 drivers/gpu/drm/sdrm/Makefile create mode 100644 drivers/gpu/drm/sdrm/sdrm.c create mode 100644 drivers/gpu/drm/sdrm/sdrm.h create mode 100644 drivers/gpu/drm/sdrm/sdrm_encon.c create mode 100644 drivers/gpu/drm/sdrm/sdrm_encon_dummy.c create mode 100644 drivers/gpu/drm/sdrm/sdrm_fb.c create mode 100644 drivers/gpu/drm/sdrm/sdrm_fbdev.c create mode 100644 drivers/gpu/drm/sdrm/sdrm_gem.c create mode 100644 include/drm/sdrm.h create mode 100644 include/drm/sdrm_encon.h