[Bug 96996] [BYT][VLV] No picture on DSI display after DRM loads on Teclast X80H tablet

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96996

--- Comment #5 from Laszlo Fiat <laszlo.fiat at gmail.com> ---
Created attachment 127200
  --> https://bugs.freedesktop.org/attachment.cgi?id=127200&action=edit
dmesg of 4.6.7 with no fastboot parameter, DSI screen goes blank

If I understand correctly, with fastboot=1 (fastset) the driver doesn't try to
initialize the dsi display, it just takes it over, and it works. 

Without the fastboot, it disables the dsi screen, tries to initialize it again,
and this is where something goes wrong:

[    9.060698] [drm:vlv_dsi_device_ready] 
[    9.097539] [drm:generic_exec_sequence] Starting MIPI sequence 1 -
MIPI_SEQ_ASSERT_RESET
[    9.129546] [drm:generic_exec_sequence] Starting MIPI sequence 2 -
MIPI_SEQ_INIT_OTP
[    9.237341] [drm:intel_dsi_enable] 
[    9.369496] [drm:generic_exec_sequence] MIPI sequence 3 -
MIPI_SEQ_DISPLAY_ON not available
[    9.373597] [drm:vlv_pipe_set_fifo_size] Pipe A FIFO split 511 / 511 / 511
[    9.373616] [drm:vlv_update_wm] Setting FIFO watermarks - A: plane=461,
cursor=63, sprite0=0, sprite1=0, SR: plane=0, cursor=0 level=0 cxsr=0
[    9.373621] [drm:intel_enable_pipe] enabling pipe A
[    9.377542] [drm:intel_dsi_enable_nop] 
[    9.429535] ------------[ cut here ]------------
[    9.429763] WARNING: CPU: 3 PID: 59 at
drivers/gpu/drm/i915/intel_display.c:13472 intel_atomic_commit+0x13bb/0x1450
[i915]
[    9.429770] WARN_ON(!lret)

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