[Intel-gfx] bad panel power sequencing delays, disabling panel

[Daniel J Blueman]

On 16 October 2012 23:16, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Tue, Oct 16, 2012 at 5:15 PM, Daniel J Blueman <daniel at quora.org> wrote:
>> On 16 October 2012 22:43, Daniel Vetter <daniel at ffwll.ch> wrote:
>>> On Tue, Oct 16, 2012 at 3:26 PM, Daniel J Blueman <daniel at quora.org> wrote:
>>>> On my Macbook Retina 2012, after a recent firmware update, i915 fails
>>>> to use the eDP-1 panel [1], which goes blank when switched to. Nouveau
>>>> works correctly though [2]. I see this behaviour on 3.6-rc to 3.7-rc1.
>>>
>>> I'm working on this, since when I plug in a 2nd screen in my own edp
>>> machine, the bios doesn't light up the internal panel and our code
>>> can't light it up, too. Unfortunately progress is slow, but you can
>>> try my current wip state at
>>>
>>> http://cgit.freedesktop.org/~danvet/drm/log/?h=for-pzanoni
>>>
>>> Please attach dmesg with drm.debug=0xe if you try this kernel.
>>> Backlight works now for me, but I still have issues with edp link
>>> training here.
>>
>> Thanks Daniel; I'm happy to collect local information/debug etc, sure.
>>
>> Alas, it looks like that repo is in an unexpected state:
[...]
> That thing is totally in the expected shape, it simply does not have a
> HEAD, but only branches

That worked, thanks. Booting, we see:

[drm:intel_dp_init], cur t1_t3 0 t8 0 t9 0 t10 0 t11_t12 4000
[drm:intel_dp_init], vbt t1_t3 0 t8 0 t9 0 t10 0 t11_t12 0
[drm:intel_dp_init], panel power up delay 21, power down delay 50,
power cycle delay 400
[drm:intel_dp_init], backlight on delay 5, off delay 5
[drm:intel_dp_init], panel power sequencer register settings: PP_ON
0x40d20032, PP_OFF 0x1f40032, PP_DIV 0x186904
[drm:intel_dp_i2c_init], i2c_init DPDDC-A
[drm:ironlake_edp_panel_vdd_on], Turn eDP VDD on
[drm:ironlake_edp_panel_vdd_on], eDP VDD already on
[drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x514500c8
[drm:intel_dp_i2c_aux_ch], aux_ch failed -110

Notable, the nvidia DP init script executed fine; perhaps tracing the
I2C access may be useful?

Full boot log at http://quora.org/2012/mbp-i915-panel-2.txt .

Thanks,
  Daniel
-- 
Daniel J Blueman