tilcdc: vblank wait timed out

Hi Jyri,

I pulled your recent tilcdc pull request on top of v4.9 and Sekhar's davinci branch (+ vga dac DT)[1].

I'm getting "vblank wait timed out" errors when running simple modetest[2].

This error happened before with the drm_bridge series[3], but went away at one of the subsequent patch versions.

Could you please verify that you see the same error and advise on what could be the reason? I'm investigating on my own as well.

Best regards, Bartosz Golaszewski

[1] https://github.com/brgl/linux/tree/tilcdc/modetest_error [2] http://pastebin.com/rCM44Uds [3] http://www.spinics.net/lists/dri-devel/msg123732.html