On 1 December 2015 at 17:04, Archit Taneja <architt@xxxxxxxxxxxxxx> wrote:
>
>
> On 11/28/2015 04:09 PM, Xinliang Liu wrote:
>>
>> Add support for external HDMI bridge.
>>
>> Signed-off-by: Xinliang Liu <xinliang.liu@xxxxxxxxxx>
>> Signed-off-by: Xinwei Kong <kong.kongxinwei@xxxxxxxxxxxxx>
>> Signed-off-by: Andy Green <andy.green@xxxxxxxxxx>
>> ---
>> drivers/gpu/drm/hisilicon/hisi_drm_dsi.c | 51
>> ++++++++++++++++++++++++++++++++
>> 1 file changed, 51 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/hisilicon/hisi_drm_dsi.c
>> b/drivers/gpu/drm/hisilicon/hisi_drm_dsi.c
>> index 066e08d..9e056db 100644
>> --- a/drivers/gpu/drm/hisilicon/hisi_drm_dsi.c
>> +++ b/drivers/gpu/drm/hisilicon/hisi_drm_dsi.c
>> @@ -78,6 +78,7 @@ struct dsi_hw_ctx {
>>
>> struct hisi_dsi {
>> struct drm_encoder encoder;
>> + struct drm_bridge *bridge;
>> struct mipi_dsi_host host;
>> struct drm_display_mode cur_mode;
>> struct dsi_hw_ctx *ctx;
>> @@ -671,6 +672,25 @@ static int dsi_host_init(struct device *dev, struct
>> hisi_dsi *dsi)
>> return 0;
>> }
>>
>> +static int dsi_bridge_init(struct drm_device *dev, struct hisi_dsi *dsi)
>> +{
>> + struct drm_encoder *encoder = &dsi->encoder;
>> + struct drm_bridge *bridge = dsi->bridge;
>> + int ret;
>> +
>> + /* associate the bridge to dsi encoder */
>> + encoder->bridge = bridge;
>> + bridge->encoder = encoder;
>> +
>> + ret = drm_bridge_attach(dev, bridge);
>> + if (ret) {
>> + DRM_ERROR("failed to attach exteranl bridge\n");
>
>
> s/exteranl/external
>
will be fixed in v3.
>
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> static int dsi_bind(struct device *dev, struct device *master, void
>> *data)
>> {
>> struct dsi_data *ddata = dev_get_drvdata(dev);
>> @@ -686,6 +706,10 @@ static int dsi_bind(struct device *dev, struct device
>> *master, void *data)
>> if (ret)
>> return ret;
>>
>> + ret = dsi_bridge_init(drm_dev, dsi);
>> + if (ret)
>> + return ret;
>> +
>> return 0;
>> }
>>
>> @@ -702,8 +726,35 @@ static const struct component_ops dsi_ops = {
>> static int dsi_parse_dt(struct platform_device *pdev, struct hisi_dsi
>> *dsi)
>> {
>> struct dsi_hw_ctx *ctx = dsi->ctx;
>> + struct device_node *np = pdev->dev.of_node;
>> + struct device_node *endpoint, *bridge_node;
>> + struct drm_bridge *bridge;
>> struct resource *res;
>>
>> + /*
>> + * Get the endpoint node. In our case, dsi has one output port
>> + * to which the external HDMI bridge is connected.
>> + */
>> + endpoint = of_graph_get_next_endpoint(np, NULL);
>> + if (!endpoint) {
>> + DRM_ERROR("no valid endpoint node\n");
>> + return -ENODEV;
>> + }
>> + of_node_put(endpoint);
>> +
>> + bridge_node = of_graph_get_remote_port_parent(endpoint);
>> + if (!bridge_node) {
>> + DRM_ERROR("no valid bridge node\n");
>> + return -ENODEV;
>> + }
>> + of_node_put(bridge_node);
>> +
>> + bridge = of_drm_find_bridge(bridge_node);
>> + if (!bridge) {
>> + DRM_INFO("wait for external HDMI bridge driver.\n");
>> + return -EPROBE_DEFER;
>> + }
>> + dsi->bridge = bridge;
>
>
> This could be left for later, but it would be better if the dsi driver
> registers even if the bridge driver module isn't inserted yet, or
> happens much later in boot.
>
> We could achieve this by trying to attach the bridge (done in
> dsi_bridge_init) in the dsi_host_attach callback instead of having it
> in dsi_bind.
Do you mean that it is the right time or place to attach the bridge in
dsi_host_attach callback.
Why? Because at this time bridge driver must be register?
Thanks,
-xinliang
>
> Thanks,
> Archit
>
>>
>> ctx->dsi_cfg_clk = devm_clk_get(&pdev->dev, "pclk_dsi");
>> if (IS_ERR(ctx->dsi_cfg_clk)) {
>>
>
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
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