Re: [PATCH RFC 03/10] drm/panel: Add LGD panel driver for Sony Xperia XZ3

[Marijn Suijten <marijn.suijten@somainline.org>]

On 2023-05-30 01:18:40, Dmitry Baryshkov wrote:
<snip>
> >>>>> +    ret = mipi_dsi_dcs_set_display_on(dsi);
> >>>>> +    if (ret < 0) {
> >>>>> +        dev_err(dev, "Failed to turn display on: %d\n", ret);
> >>>>> +        return ret;
> >>>>> +    }
> >>>>
> >>>> My usual question: should the mipi_dsi_dcs_exit_sleep_mode() / mipi_dsi_dcs_set_display_on() be moved from prepare() to enable() part?
> >>>
> >>>
> >>> No, prepare is called before the video stream is started and when display is still in LPM mode and the mode hasn't been set.
> >>>
> >>
> >> Yes, that's my point. Shouldn't we enable the panel _after_ starting the stream?
> > 
> > I have never investigated what it takes to split these functions, but
> > some of these panels do show some corruption at startup which may be
> > circumvented by powering the panel on after starting the video stream?
> > 
> > I'm just not sure where to make the split: downstream does describe a
> > qcom,mdss-dsi-on-command and qcom,mdss-dsi-post-panel-on-command, where
> > the latter only contains set_display_on() (not exit_sleep_mode()).
> > It is documented like:
> > 
> >      same as "qcom,mdss-dsi-on-command" except commands are sent after
> >      displaying an image."
> > 
> > So this seems like the right way to split them up, I'll test this out on
> > all submitted panel drivers.
> 
> Interesting enough, Neil suggested that sending all the commands during 
> pre_enable() is the correct sequence (especially for VIDEO mode panels), 
> since not all DSI hosts can send commands after switching to the VIDEO mode.

Note that all these panels and Driver-ICs are command-mode, and/or
programmed to run in command-mode, so there shouldn't be any notion of a
VIDEO stream (any command-mode frame is just an "arbitrary command" as
far as I understood).

- Marijn