Re: [PATCH v16 1/4] drm/bridge: dw-hdmi: introduce dw_hdmi_enable_poll()

[Paul Cercueil <paul@xxxxxxxxxxxxxxx>]

Hi Neil,

Le jeu., mars 3 2022 at 17:23:02 +0100, Neil Armstrong 
<narmstrong@xxxxxxxxxxxx> a écrit :
> Hi,
>
> On 26/02/2022 18:12, H. Nikolaus Schaller wrote:
> > so that specialization drivers like ingenic-dw-hdmi can enable 
> > polling.
> >
> > Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 9 +++++++++
> >   include/drm/bridge/dw_hdmi.h              | 1 +
> >   2 files changed, 10 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c 
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > index 4befc104d2200..43e375da131e8 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > @@ -3217,6 +3217,15 @@ static int dw_hdmi_parse_dt(struct dw_hdmi 
> > *hdmi)
> >   	return 0;
> >   }
> >   +void dw_hdmi_enable_poll(struct dw_hdmi *hdmi, bool enable)
> > +{
> > +	if (hdmi->bridge.dev)
> > +		hdmi->bridge.dev->mode_config.poll_enabled = enable;
> > +	else
> > +		dev_warn(hdmi->dev, "no hdmi->bridge.dev");
> > +}
> > +EXPORT_SYMBOL_GPL(dw_hdmi_enable_poll);
> > +
> >   struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
> >   			      const struct dw_hdmi_plat_data *plat_data)
> >   {
> > diff --git a/include/drm/bridge/dw_hdmi.h 
> > b/include/drm/bridge/dw_hdmi.h
> > index 2a1f85f9a8a3f..963960794b40e 100644
> > --- a/include/drm/bridge/dw_hdmi.h
> > +++ b/include/drm/bridge/dw_hdmi.h
> > @@ -196,5 +196,6 @@ enum drm_connector_status 
> > dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
> >   void dw_hdmi_phy_update_hpd(struct dw_hdmi *hdmi, void *data,
> >   			    bool force, bool disabled, bool rxsense);
> >   void dw_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi, void *data);
> > +void dw_hdmi_enable_poll(struct dw_hdmi *hdmi, bool enable);
> >     #endif /* __IMX_HDMI_H__ */
>
> As I understand, this is because the IRQ line of the dw-hdmi IP isn't 
> connected right ? and you use the display-connector ddc gpio instead ?

According to the CI20 schematic, it is wired properly. So that's 
strange.

> In this case I think the Ingenic DRM core should call 
> drm_kms_helper_poll_init(drm) instead.

Yes, the ingenic-drm driver does not poll for connectors because until 
now it never has been needed.

Cheers,
-Paul