Re: [PATCH v2 2/6] drm: lcdif: Drop unnecessary NULL pointer check on lcdif->bridge

[Liu Ying]

On Wed, 2023-01-25 at 14:56 +0100, Marek Vasut wrote:
> On 1/25/23 07:40, Liu Ying wrote:
> > A valid bridge is already found in lcdif_attach_bridge() and set
> > to lcdif->bridge, so lcdif->bridge cannot be a NULL pointer. Drop
> > the unnecessary NULL pointer check in KMS stage.
> 
> Is it possible that a panel (instead of a bridge) be attached to
> LCDIFv3 
> e.g. in case of iMXRT ?

According to IMXRT1160 and IMXRT1170 reference manuals, it looks like
LCDIFv2(similar to LCDIFv3, but not the same) may connect to a parallel
display panel through a mux(either eLCDIF or LCDIFv2).  That mux could
be a bridge.  But, it doesn't matter, because devm_drm_of_get_bridge()
may create a panel bridge if a panel is connected directly(See
kerneldoc of devm_drm_of_get_bridge()).

Regards,
Liu Ying

> 
> > Signed-off-by: Liu Ying <victor.liu@xxxxxxx>
> > ---
> > v1->v2:
> > * Split from patch 2/2 in v1. (Marek, Alexander)
> 
> Much appreciated, thanks.
> 
> [...]