On Wed, 5 Oct 2011 10:25:17 -0700 Jesse Barnes <jbar...@virtuousgeek.org> wrote:
> This set of patches lays the groundwork for supporting 3 pipes on IVB > hardware. We've only tested it so far with 2 HDMI plus 1 VGA (a > configuration that doesn't work), and are awaiting 3 DP port hardware > (the officially supported config) to complete our testing. > > So this patchset is necessary but may not be sufficient (once we have 3 > DP hardware we can debug and see). Review and comments appreciated. Gordon, I think this set (with the updated 4/4 patch) is ready for testing. You'll need a configuration that uses the same monitor on two identical ports to get all the pipes running. I'm also interested in the failure cases though. There are some limitations: 1) two heads need to use the same timings and ports 2) FDI B and C share lanes, so are limited to a max of two lanes each For (1), I'm currently using a VGA attached monitor, an HDMI attached monitor, and another HDMI monitor attached to a DP->HDMI dongle on my SDV (that allows me to drive the port with the HDMI encoder rather than the DP encoder). Unfortunately, (2) complicates our mode list output. If you query for available modes, you'll definitely see some that you can't drive with 3 pipes enabled. I'm not sure if the best way to handle that... -- Jesse Barnes, Intel Open Source Technology Center
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