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?
Regards,
Jonas
>> + }
>> +
>> + 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>
>
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