[Letux-kernel] [PATCH v3 00/56] Convert DSI code to use drm_mipi_dsi and drm_panel

[H. Nikolaus Schaller]

> Am 11.11.2020 um 07:40 schrieb Tomi Valkeinen <tomi.valkeinen at ti.com>:
> 
> On 10/11/2020 23:04, H. Nikolaus Schaller wrote:
>> 
>>> Am 10.11.2020 um 17:52 schrieb Tomi Valkeinen <tomi.valkeinen at ti.com>:
>>> 
>>> On 10/11/2020 18:49, H. Nikolaus Schaller wrote:
>>> 
>>> I guess you have the same issue. It goes to dsi_bridge_mode_valid, then __dsi_calc_config, and stays
>>> there finding good clocks.
>> 
> 
> drm_display_mode.clock is in kHz, but the panel driver writes Hz (w677l_PIXELCLOCK) to it.

Ok, fixing this removes the stuck thread issue. Thanks for pointing this out!

> But
> there's more after fixing that. The DSI gets configured in bridge's modeset, which I think is before
> w677l_prepare where the panel already sends DSI commands. Also, the dsi driver fails to lock the
> PLL, so possibly the clock calcs are still wrong.

What I now get is

[  131.035006] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [CRTC:55:crtc-0] flip_done timed out
[  141.272174] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [CONNECTOR:54:DSI-1] flip_done timed out

I think for further experiments we could hack the device tree to compatible = "orisetech,otm8009a";
and configure for panel-orisetech-otm8009a.ko. Since this panel driver is known to work elsewhere
we could exclude panel driver issues for the moment. To be safe we can modify otm8009a_dcs_write_buf()
to just print what it would be doing.

BR,
Nikolaus