[PATCH v3] drm/bridge: ti-sn65dsi86: Check bridge connection failure

[Laurent Pinchart]

On Tue, Mar 18, 2025 at 10:00:31PM +0100, Wolfram Sang wrote:
> Hi Laurent,
> 
> > > Read out and check the ID registers, so we can bail out if I2C
> > > communication does not work or if the device is unknown.
> > 
> > What's the advantage of that, what are you trying to guard against ?
> 
> That a random chip at address 0x2c will be used.

Is that really a problem ? That would only occur with a broken DT, is it
worth guarding against a development-time issue with a runtime check
that will increase boot time for every user ?

> > > Tested on a
> > > Renesas GrayHawk board (R-Car V4M) by using a wrong I2C address and by
> > > not enabling RuntimePM for the device.
> > 
> > What do you mean by not enabling runtime PM for the device ?
> 
> I left out pm_runtime_get() before regmap_read_bulk().

-- 
Regards,

Laurent Pinchart