Re: [PATCH v6 5/8] drm/msm/dp: prevent multiple votes for dp resources

[Dmitry Baryshkov]

On 01/04/2022 02:23, Doug Anderson wrote:
> Hi,
>
> On Wed, Mar 30, 2022 at 9:04 AM Sankeerth Billakanti
> <quic_sbillaka@xxxxxxxxxxx> wrote:
> > The aux_bus support with the dp_display driver will enable the dp
> > resources during msm_dp_modeset_init. The host_init has to return early
> > if the core is already initialized to prevent putting an additional vote
> > for the dp controller resources.
> >
> > Signed-off-by: Sankeerth Billakanti <quic_sbillaka@xxxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/msm/dp/dp_display.c | 10 ++++++++++
> >   1 file changed, 10 insertions(+)
>
> I'm not a huge fan of this but I'll leave it up to Dmitry. In general
> it feels like there should be _a_ place that enables these resources.
> Checks like this make it feel like we just scattershot enabling
> resources in a bunch of random places instead of coming up with the
> design for enabling them in the right place.

I'd prefer to see a check for eDP in dp_display_config_hpd(). Or even 
better to see that this function isn't called for eDP at all.

> In any case, if we do end up landing this patch, it sure feels like it
> needs to move earlier in the patch series, right? This patch shouldn't
> hurt even without the other patches in the series but if you apply the
> earlier patches in the series without this one then you'll have a bug,
> right? That means this needs to come earlier.
>
> -Doug


--
With best wishes
Dmitry