Re: [PATCH 1/6] dt-bindings: tc358775: Add support for tc358765

[Alexander Stein <alexander.stein@ew.tq-group.com>]

Hi,

Am Montag, 27. November 2023, 13:44:30 CET schrieb Michael Walle:
> Hi,
> 
> > The tc358765 is similar to tc358775 except for the stdby-gpios.
> 
> Bad timing (for me). I'm about to send a bigger patch series for the
> tc358775 which fixes the (completely) broken initialialization. And also
> contains some of your fixes.
> 
> That being said, I intend to make the standby gpio optional also for the
> tc358755, because it might just be hardwired on the board.
> 
> But second, I'm really curious if this bridge is working for you correctly
> as it is at the moment. One particular thing I've noticed is that you must
> release the reset while both the clock and the data lanes are in LP11 mode.
> Otherwise, the bridge won't work properly (i.e. horizontally shifted
> picture, or no picture at all).

Apparently this seems to be true for all Toshiba DSI bridges. The power on 
sequence for TC9595 (TC358767) also requires LP-11 before releasing the reset 
signal RESX. Additionally LP-11 is requires for using the DP AUX channel.
This also relates to the patch set from Dmitry [1].

Best regards,
Alexander

[1] https://lore.kernel.org/dri-devel/20231016165355.1327217-1-dmitry.baryshkov@linaro.org/

> What DSI host controller are you using?
> 
> -michael


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