Hi Jonas,
On Tue, May 26, 2020 at 02:23:33PM +0000, Jonas Karlman wrote:
> On 2020-05-26 14:50, Neil Armstrong wrote:
> > On 26/05/2020 03:15, Laurent Pinchart wrote:
> >> On all platforms except i.MX and Rockchip, the dw-hdmi DT bindings
> >> require a video output port connected to an HDMI sink (most likely an
> >> HDMI connector, in rare cases another bridges converting HDMI to another
> >> protocol). For those platforms, retrieve the next bridge and attach it
> >> from the dw-hdmi bridge attach handler.
> >>
> >> Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
> >> ---
> >> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 52 ++++++++++++++++++++++-
> >> include/drm/bridge/dw_hdmi.h | 2 +
> >> 2 files changed, 53 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> >> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> >> index 6148a022569a..512e67bb1c32 100644
> >> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> >> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> >> @@ -143,6 +143,7 @@ struct dw_hdmi_phy_data {
> >> struct dw_hdmi {
> >> struct drm_connector connector;
> >> struct drm_bridge bridge;
> >> + struct drm_bridge *next_bridge;
> >>
> >> unsigned int version;
> >>
> >> @@ -2797,7 +2798,8 @@ static int dw_hdmi_bridge_attach(struct drm_bridge
> >> *bridge,
> >> struct dw_hdmi *hdmi = bridge->driver_private;
> >>
> >> if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
> >> - return 0;
> >> + return drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
> >> + bridge, flags);
> >>
> >> return dw_hdmi_connector_create(hdmi);
> >> }
> >> @@ -3179,6 +3181,50 @@ static void dw_hdmi_init_hw(struct dw_hdmi *hdmi)
> >> hdmi->phy.ops->setup_hpd(hdmi, hdmi->phy.data);
> >> }
> >>
> >> +static int dw_hdmi_parse_dt(struct dw_hdmi *hdmi)
> >> +{
> >> + struct device_node *endpoint;
> >> + struct device_node *remote;
> >> +
> >> + if (!hdmi->plat_data->output_port)
> >> + return 0;
> >> +
> >> + endpoint = of_graph_get_endpoint_by_regs(hdmi->dev->of_node,
> >> + hdmi->plat_data->output_port,
> >> + -1);
> >> + if (!endpoint) {
> >> + /*
> >> + * Don't treat this as a fatal error as the Rockchip DW-HDMI
> >> + * binding doesn't make the output port mandatory.
> >> + */
> >> + dev_dbg(hdmi->dev, "Missing endpoint in port@%u\n",
> >> + hdmi->plat_data->output_port);
> >> + return 0;
>
> After this series only rcar-du set output_port so this block should only
> run for rcar-du, for platforms without output_port the if-statement
> for !hdmi->plat_data->output_port already return success so you can
> probably return fatal error here.
>
> The comment is a little bit misleading because of the if-statement above
> or am I missing something?
You're right, I'll turn this into an error.
> >> + }
> >> +
> >> + remote = of_graph_get_remote_port_parent(endpoint);
> >> + of_node_put(endpoint);
> >> + if (!remote) {
> >> + dev_err(hdmi->dev, "Endpoint in port@%u unconnected\n",
> >> + hdmi->plat_data->output_port);
> >> + return -ENODEV;
> >> + }
> >> +
> >> + if (!of_device_is_available(remote)) {
> >> + dev_err(hdmi->dev, "port@%u remote device is disabled\n",
> >> + hdmi->plat_data->output_port);
> >> + of_node_put(remote);
> >> + return -ENODEV;
> >> + }
> >> +
> >> + hdmi->next_bridge = of_drm_find_bridge(remote);
> >> + of_node_put(remote);
> >> + if (!hdmi->next_bridge)
> >> + return -EPROBE_DEFER;
> >
> > I'll be safer to print a warn for now until all platforms has been tested.
> >
> >> +
> >> + return 0;
> >> +}
> >> +
> >> static struct dw_hdmi *
> >> __dw_hdmi_probe(struct platform_device *pdev,
> >> const struct dw_hdmi_plat_data *plat_data)
> >> @@ -3216,6 +3262,10 @@ __dw_hdmi_probe(struct platform_device *pdev,
> >> mutex_init(&hdmi->cec_notifier_mutex);
> >> spin_lock_init(&hdmi->audio_lock);
> >>
> >> + ret = dw_hdmi_parse_dt(hdmi);
> >> + if (ret < 0)
> >> + return ERR_PTR(ret);
> >> +
> >> ddc_node = of_parse_phandle(np, "ddc-i2c-bus", 0);
> >> if (ddc_node) {
> >> hdmi->ddc = of_get_i2c_adapter_by_node(ddc_node);
> >> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> >> index ea34ca146b82..8ebeb65d6371 100644
> >> --- a/include/drm/bridge/dw_hdmi.h
> >> +++ b/include/drm/bridge/dw_hdmi.h
> >> @@ -126,6 +126,8 @@ struct dw_hdmi_phy_ops {
> >> struct dw_hdmi_plat_data {
> >> struct regmap *regm;
> >>
> >> + unsigned int output_port;
> >> +
> >> unsigned long input_bus_encoding;
> >> bool use_drm_infoframe;
> >> bool ycbcr_420_allowed;
> >>
> >
> > I must check on meson, since I'm not sure for now if the connector probes.
> >
> > Anyway, this looks fine.
> >
> > Reviewed-by: Neil Armstrong <narmstr...@baylibre.com>
> >
--
Regards,
Laurent Pinchart
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