Re: [PATCH v11 2/2] drm/bridge: Add Lontium LT9611C(EX/UXD) MIPI DSI to HDMI driver

[Mohit Dsor]

On Tue, Sep 01, 2026 at 09:09:11AM +0200, Luca Ceresoli wrote:
> Hello Mohit,
> 
> On Mon Aug 31, 2026 at 8:38 PM CEST, Mohit Dsor wrote:
> 
> [...]
> 
> >> > +#include <drm/drm_of.h>
> >>
> >> Unused include?
> > Using this header for of_drm_get_bridge_by_endpoint
> 
> of_drm_get_bridge_by_endpoint() is declared in drm_bridge.h.
Thanks, will remove this header as well.
> 
> >> > +static enum drm_mode_status
> >> > +lt9611c_hdmi_tmds_char_rate_valid(const struct drm_bridge *bridge,
> >>                      ^^^^
> >> Out of curiosity, what does "char" means here?
> > "char" = character — TMDS (Transition Minimized Differential Signaling) transmits data using 8b/10b encoding, where each
> >   encoded 10-bit symbol is called a "character". The TMDS character rate is the number of these symbols transmitted per second
> >   per lane, which equals the TMDS clock frequency.
> 
> Ah, OK, thanks for the explanation.
> 
> >> Also, I _think_ lt9611c_regulator_init() could just
> >> devm_regulator_bulk_get_enable() to do both things at once, but I'm not
> >> sure that would be compatible with PM. If it's safe it would simplify the
> >> code quite a lot, and also allow using devm_drm_bridge_add() below, making
> >> the remove function almost empty.
> > regulator_bulk_disable/enable are called in suspend/resume and in remove — so devm_regulator_bulk_get_enable is not suitable
> >   here
> 
> OK, I was not sure about that, thanks for checking.
> 
> Luca
> 
> --
> Luca Ceresoli, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com