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drm/hisilicon: Add support for external bridge

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Add support for external HDMI bridge.

v8: None.
v7: None.
v6: None.
v5: None.
v4: None.
v3:
- Fix a typo: s/exteranl/external.
v2:
- Remove abtraction layer.

Signed-off-by: Xinliang Liu <xinliang.liu@linaro.org>
Signed-off-by: Xinwei Kong <kong.kongxinwei@hisilicon.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
This commit is contained in:
Xinliang Liu 2015-11-23 10:57:04 +08:00
parent 834480d233
commit 40ed27b886
1 changed files with 52 additions and 0 deletions
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52
drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
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@ -80,6 +80,7 @@ struct dsi_hw_ctx {
struct dw_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;
@ -700,6 +701,25 @@ static int dsi_host_init(struct device *dev, struct dw_dsi *dsi)
return 0;
}
static int dsi_bridge_init(struct drm_device *dev, struct dw_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 external bridge\n");
return ret;
}
return 0;
}
static int dsi_bind(struct device *dev, struct device *master, void *data)
{
struct dsi_data *ddata = dev_get_drvdata(dev);
@ -715,6 +735,10 @@ 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;
}
@ -731,8 +755,36 @@ static const struct component_ops dsi_ops = {
static int dsi_parse_dt(struct platform_device *pdev, struct dw_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 port1
* to which the external HDMI bridge is connected.
*/
endpoint = of_graph_get_endpoint_by_regs(np, 1, -1);
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;
ctx->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(ctx->pclk)) {
DRM_ERROR("failed to get pclk clock\n");