Hi Mauro, On Friday 09 November 2012 09:51:11 Mauro Carvalho Chehab wrote: > Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> escreveu: > > On Thursday 08 November 2012 19:14:18 Laurent Pinchart wrote: > > > Hi Mauro, > > > > > > Here's the application I've used to test V4L2 dma-buf support with a UVC > > > webcam and an Intel GPU supported by the i915 driver. > > > > > > The kernel code is available in my git tree at > > > > > > git://linuxtv.org/pinchartl/media.git devel/dma-buf-v10 > > > > > > (http://git.linuxtv.org/pinchartl/media.git/shortlog/refs/heads/devel/ > > > v4l2-clock) > > > > > > Don't forget to enable dma-buf and UVC support when compiling the > > > kernel. > > > > > > The userspace code is based on the v4l2-drm-example application written > > > by Tomasz (the original code is available at > > > git://git.infradead.org/users/kmpark/public-apps). I need to clean up my > > > modifications to push them back to the repository, in the meantime the > > > code is attached to this e-mail. > > > > > > To compile the application, just run make with the KDIR variable set to > > > the path to your Linux kernel tree with the dma-buf patches applied. > > > Don't forget to make headers_install in the kernel tree as the Makefile > > > will look for headers in $KDIR/usr. > > > > > > You will need a recent version of libdrm with plane support available. > > > 2.4.39 should do. > > > > > > The following command line will capture VGA YUYV data from the webcam > > > and display it on the screen. You need to run it in a console as root > > > without the X server running. > > > > > > ./dmabuf-sharing -M i915 -o 7:3:1600x900 -i /dev/video0 -S 640,480 > > > -f YUYV -F YUYV -s 640,480@0,0 -t 640,480@0,0 -b 2 > > > > I forgot to mention that the -o parameter takes the connector ID, CRTC ID > > and mode as parameters. The mode is easy to find, but the connector and > > CRTC IDs are a bit more tricky. You can run the modetest application > > (part of libdrm but not installed by most distributions, so a manual > > compilation is needed) to dump all CRTC, encoder and connector > > information to the console. Pick the connector associated with your > > display, and the CRTC associated with the encoder associated with that > > connector. > > Didn't work: > $ sudo ./modetest > trying to load module i915...failed. > trying to load module radeon...failed. > trying to load module nouveau...failed. > trying to load module vmwgfx...failed. > trying to load module omapdrm...failed. > failed to load any modules, aborting. > > > Even so, > > $ sudo /usr/bin/dristat > /dev/dri/card0 > > and: > > $ lsmod|grep i915 > i915 530346 2 > video 18936 1 i915 > i2c_algo_bit 13257 1 i915 > drm_kms_helper 44701 1 i915 > drm 255010 3 i915,drm_kms_helper > i2c_core 38314 5 > drm,i915,i2c_i801,drm_kms_helper,i2c_algo_bit > > The GPU on this notebook is this one: > > 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 > Integrated Graphics Controller (primary) (rev 0c) (prog-if 00 [VGA > controller]) There's the explanation. Your graphics controller doesn't support planes :-( Any chance to have access to a computer based on an Ironlake, Sandy Bridge, Ivy Bridge or Haswell ? > Subsystem: Dell Device 026f > Flags: bus master, fast devsel, latency 0, IRQ 45 > Memory at f8000000 (64-bit, non-prefetchable) [size=1M] > Memory at d0000000 (64-bit, prefetchable) [size=256M] > I/O ports at 1800 [size=8] > Expansion ROM at <unassigned> [disabled] > Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- > Capabilities: [d0] Power Management version 3 > Kernel driver in use: i915 -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
