Re: [PATCH v3 5/6] drm/bridge: imx: add driver for HDMI TX Parallel Audio Interface

Alexander Stein
2025-08-07T06:49:03Z

Hi,

Am Mittwoch, 6. August 2025, 05:49:13 CEST schrieb Shengjiu Wang:
> On Tue, Aug 5, 2025 at 3:09 PM Alexander Stein
> <alexander.stein@ew.tq-group.com> wrote:
> [snip]
> > > +static int imx8mp_dw_hdmi_bind(struct device *dev)
> > > +{
> > > + struct dw_hdmi_plat_data *plat_data;
> > > + struct imx8mp_hdmi *hdmi;
> > > + int ret;
> > > +
> > > + hdmi = dev_get_drvdata(dev);
> > > + plat_data = &hdmi->plat_data;
> > > +
> > > + ret = component_bind_all(dev, plat_data);
> >
> > Do you really need plat_data variable?
>
> yes, it is used in imx8mp_hdmi_pai_bind()

Sorry for not being clear. I'm not talking about struct dw_hdmi_plat_data, but
the local variable plat_data. You can use

ret = component_bind_all(dev, &hdmi->plat_data);

directly.

>
> >
> > > + if (ret)
> > > + return dev_err_probe(dev, ret, "component_bind_all failed!\n");
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static void imx8mp_dw_hdmi_unbind(struct device *dev)
> > > +{
> > > + struct dw_hdmi_plat_data *plat_data;
> > > + struct imx8mp_hdmi *hdmi;
> > > +
> > > + hdmi = dev_get_drvdata(dev);
> > > + plat_data = &hdmi->plat_data;
> > > +
> > > + component_unbind_all(dev, plat_data);
> >
> > Do you really need plat_data variable?
>
> yes, it is used by imx8mp_hdmi_pai_unbind()

Same as above. Call

component_unbind_all(dev, &hdmi->plat_data)

directly. Also consider assigning struct imx8mp_hdmi *hdmi = dev_get_drvdata(dev);
directly.

Best regards,
Alexander

>
> >
> > > +}
> > > +
> > > +static const struct component_master_ops imx8mp_dw_hdmi_ops = {
> > > + .bind = imx8mp_dw_hdmi_bind,
> > > + .unbind = imx8mp_dw_hdmi_unbind,
> > > +};
> > > +
> > > static int imx8mp_dw_hdmi_probe(struct platform_device *pdev)
> > > {
> > > struct device *dev = &pdev->dev;
> > > struct dw_hdmi_plat_data *plat_data;
> > > + struct component_match *match;
> >
> > Set match = NULL for drm_of_component_match_add (and subcalls) to allocate memory.
>
> Ok.
>
> best regards
> Shengjiu wang.
> >
> > Best regards
> > Alexander
> >
> > > + struct device_node *remote;
> > > struct imx8mp_hdmi *hdmi;
> > > + int ret;
> > >
> > > hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
> > > if (!hdmi)
> > > @@ -108,6 +145,22 @@ static int imx8mp_dw_hdmi_probe(struct platform_device *pdev)
> > >
> > > platform_set_drvdata(pdev, hdmi);
> > >
> > > + /* port@2 is for hdmi_pai device */
> > > + remote = of_graph_get_remote_node(pdev->dev.of_node, 2, 0);
> > > + if (remote && of_device_is_available(remote)) {
> > > + drm_of_component_match_add(dev, &match, component_compare_of, remote);
> > > +
> > > + of_node_put(remote);
> > > +
> > > + ret = component_master_add_with_match(dev, &imx8mp_dw_hdmi_ops, match);
> > > + if (ret)
> > > + dev_warn(dev, "Unable to register aggregate driver\n");
> > > + /*
> > > + * This audio function is optional for avoid blocking display.
> > > + * So just print warning message and no error is returned.
> > > + */
> > > + }
> > > +
> > > return 0;
> > > }
> > >
> > > @@ -115,6 +168,8 @@ static void imx8mp_dw_hdmi_remove(struct platform_device *pdev)
> > > {
> > > struct imx8mp_hdmi *hdmi = platform_get_drvdata(pdev);
> > >
> > > + component_master_del(&pdev->dev, &imx8mp_dw_hdmi_ops);
> > > +
> > > dw_hdmi_remove(hdmi->dw_hdmi);
> > > }
> > >
> > > diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> > > index 095cdd9b7424..336f062e1f9d 100644
> > > --- a/include/drm/bridge/dw_hdmi.h
> > > +++ b/include/drm/bridge/dw_hdmi.h
> > > @@ -143,6 +143,12 @@ struct dw_hdmi_plat_data {
> > > const struct drm_display_info *info,
> > > const struct drm_display_mode *mode);
> > >
> > > + /*
> > > + * priv_audio is specially used for additional audio device to get
> > > + * driver data through this dw_hdmi_plat_data.
> > > + */
> > > + void *priv_audio;
> > > +
> > > /* Platform-specific audio enable/disable (optional) */
> > > void (*enable_audio)(struct dw_hdmi *hdmi, int channel,
> > > int width, int rate, int non_pcm, int iec958);
> > >
> >
> >
> > --
> > TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
> > Amtsgericht München, HRB 105018
> > Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
> > http://www.tq-group.com/
> >
> >
>

--
TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
Amtsgericht München, HRB 105018
Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider