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drm/rockchip: dw-dp: support fix stream and connector

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The DP Port may attach a DP MST bridge device as follow:
+-------------------------+      +---------------------------------+
|                         |      |                                 |
|           +---------+   |      |                   +-------------+
|           |         |   |      |                   |             |
|           | stream0 |   |      |                   | Output Port1|
|           |         |   |      |                   |             |
|           +---------+   |      |                   +-------------+
|                         |      |                                 |
|                         |      |                                 |
|           +---------+   |      +-------------+     +-------------+
|           |         |   |      |             |     |             |
| DP Port   | stream1 |   +------> Input Port0 |     | Output Port2|
|           |         |   |      |             |     |             |
|           +---------+   |      +-------------+     +-------------+
|                         |      |                                 |
|                         |      |                                 |
|           +---------+   |      |                   +-------------+
|           |         |   |      |                   |             |
|           | stream2 |   |      |                   | Output Port3|
|           |         |   |      |                   |             |
|           +---------+   |      |                   +-------------+
|                         |      |     DP MST Bridge               |
+-------------------------+      +---------------------------------+
The DP MST bridge device may be a branch device, such as DP
MST HUB, the branch unit in DP MST monitor, A DP MST bridge
chip and so on.

When a sink device connected to the DP MST bridege device's
output port, The sink device may receive the stream from
steram0/1/2.

When the DP MST bridge device is a bridge chip and the output
port attach to a fixed device(another bridge device or panel).
The output port may want bind itself to a fixed stream.

To satisfy this requirement, The prop
"rockchip,mst-fixed-ports" is used to do it.
For example, define as follow:
rockchip,mst-fixed-ports = <1 2 3>;
It mean that:
DP Port stream0 --> DP MST bridge Output Port1
DP Port stream1 --> DP MST bridge Output Port2
DP Port stream2 --> DP MST bridge Output Port3

Change-Id: I91dfc51a5e8a533ebbabdcae572163907ec2c9fe
Signed-off-by: Zhang Yubing <yubing.zhang@rock-chips.com>
This commit is contained in:
Zhang Yubing
2024-04-17 14:15:42 +08:00
committed by Tao Huang
parent 3220dcb643
commit 793f858ef2
1 changed files with 45 additions and 0 deletions
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45
drivers/gpu/drm/rockchip/dw-dp.c
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@@ -424,6 +424,7 @@ struct dw_dp_mst_enc {
struct dw_dp_mst_conn *mst_conn;
struct dw_dp *dp;
int stream_id;
int fix_port_num;
bool active;
};
@@ -488,6 +489,7 @@ struct dw_dp {
bool is_loader_protect;
bool support_mst;
bool is_mst;
bool is_fix_port;
int mst_port_num;
int active_mst_links;
struct drm_dp_mst_topology_mgr mst_mgr;
@@ -1306,6 +1308,7 @@ static int dw_dp_mst_info_dump(struct seq_file *s, void *data)
struct dw_dp *dp = node->info_ent->data;
struct dw_dp_mst_conn *mst_conn;
struct drm_property_blob *path_blob;
int i;
if (dp->mst_mgr.cbs) {
drm_dp_mst_dump_topology(s, &dp->mst_mgr);
@@ -1321,6 +1324,17 @@ static int dw_dp_mst_info_dump(struct seq_file *s, void *data)
(char *)path_blob->data);
}
seq_puts(s, "\n");
if (dp->is_fix_port) {
seq_puts(s, "\n*** Fix port info ***\n");
seq_puts(s, "stream id | port num\n");
for (i = 0; i < dp->mst_port_num; i++) {
if (!dp->mst_enc[i].dp)
continue;
seq_printf(s, "%-16d %d\n", dp->mst_enc[i].stream_id,
dp->mst_enc[i].fix_port_num);
}
}
}
return 0;
@@ -3924,6 +3938,8 @@ dw_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_p
for (i = 0; i < dp->mst_port_num; i++) {
if (!of_device_is_available(dp->mst_enc[i].port_node))
continue;
if (dp->is_fix_port && dp->mst_enc[i].fix_port_num != port->port_num)
continue;
ret = drm_connector_attach_encoder(&mst_conn->connector, &dp->mst_enc[i].encoder);
if (ret)
goto err;
@@ -3979,6 +3995,31 @@ dw_dp_create_fake_mst_encoders(struct dw_dp *dp)
return true;
}
static int dw_dp_mst_get_fix_port(struct dw_dp *dp)
{
char *prop_name = "rockchip,mst-fixed-ports";
int elem_len, ret, i;
int elem_data[DPTX_MAX_STREAMS];
if (!device_property_present(dp->dev, prop_name))
return 0;
elem_len = device_property_count_u32(dp->dev, prop_name);
if (dp->mst_port_num != elem_len)
return -EINVAL;
ret = device_property_read_u32_array(dp->dev, prop_name, elem_data, elem_len);
if (ret)
return -EINVAL;
dp->is_fix_port = true;
for (i = 0; i < dp->mst_port_num; i++)
dp->mst_enc[i].fix_port_num = elem_data[i];
return 0;
}
static int dw_dp_mst_encoder_init(struct dw_dp *dp, int conn_base_id)
{
int ret;
@@ -3989,6 +4030,10 @@ static int dw_dp_mst_encoder_init(struct dw_dp *dp, int conn_base_id)
INIT_LIST_HEAD(&dp->mst_conn_list);
dp->mst_mgr.cbs = &mst_cbs;
dw_dp_create_fake_mst_encoders(dp);
ret = dw_dp_mst_get_fix_port(dp);
if (ret)
return ret;
ret = drm_dp_mst_topology_mgr_init(&dp->mst_mgr, dp->encoder.dev,
&dp->aux, 16, dp->mst_port_num, conn_base_id);
if (ret)