In order to pass DSI specific parameters to the DSI host, we need the
driver to create a mipi_dsi_device DSI device that attaches to the
host.
Use of_graph helpers to get the DSI host DT node. Create a MIPI DSI
device using this host. Finally, attach this device to the DSI host.
Populate DT parameters (number of data lanes for now) that are required
for DSI RX to work correctly. Hardcode few other parameters (rgb,
embedded_sync) for now.
Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/i2c/adv7511.c | 130 +++++++++++++++++++++++++++++++++++++++---
1 file changed, 123 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c
index 75be17c..6c2a89a 100644
--- a/drivers/gpu/drm/i2c/adv7511.c
+++ b/drivers/gpu/drm/i2c/adv7511.c
@@ -11,6 +11,7 @@
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
+#include <linux/of_graph.h>
#include <linux/regmap.h>
#include <linux/slab.h>
@@ -19,6 +20,7 @@
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
+#include <drm/drm_mipi_dsi.h>
#include "adv7511.h"
@@ -56,6 +58,11 @@ struct adv7511 {
struct gpio_desc *gpio_pd;
+ /* ADV7533 DSI RX related params */
+ struct device_node *host_node;
+ struct mipi_dsi_device *dsi;
+ u8 num_dsi_lanes;
+
enum adv7511_type type;
};
@@ -392,8 +399,10 @@ static void adv7511_set_link_config(struct adv7511 *adv7511,
static void adv7533_dsi_power_on(struct adv7511 *adv)
{
- /* set number of dsi lanes (hardcoded to 4 for now) */
- regmap_write(adv->regmap_cec, 0x1c, 0x4 << 4);
+ struct mipi_dsi_device *dsi = adv->dsi;
+
+ /* set number of dsi lanes */
+ regmap_write(adv->regmap_cec, 0x1c, dsi->lanes << 4);
/* disable internal timing generator */
regmap_write(adv->regmap_cec, 0x27, 0x0b);
/* enable hdmi */
@@ -889,6 +898,51 @@ static void adv7511_bridge_mode_set(struct drm_bridge *bridge,
adv7511_mode_set(adv, mode, adj_mode);
}
+static int adv7533_attach_dsi(struct adv7511 *adv)
+{
+ struct device *dev = &adv->i2c_main->dev;
+ struct mipi_dsi_host *host;
+ struct mipi_dsi_device *dsi;
+ int ret = 0;
+ const struct mipi_dsi_device_info info = { .type = "adv7533",
+ .channel = 0,
+ .node = NULL,
+ };
+
+ host = of_find_mipi_dsi_host_by_node(adv->host_node);
+ if (!host) {
+ dev_err(dev, "failed to find dsi host\n");
+ return -EPROBE_DEFER;
+ }
+
+ dsi = mipi_dsi_device_register_full(host, &info);
+ if (IS_ERR(dsi)) {
+ dev_err(dev, "failed to create dsi device\n");
+ ret = PTR_ERR(dsi);
+ goto err_dsi_device;
+ }
+
+ adv->dsi = dsi;
+
+ dsi->lanes = adv->num_dsi_lanes;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+ MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
+
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ dev_err(dev, "failed to attach dsi to host\n");
+ goto err_dsi_attach;
+ }
+
+ return 0;
+
+err_dsi_attach:
+ mipi_dsi_device_unregister(dsi);
+err_dsi_device:
+ return ret;
+}
+
static int adv7511_bridge_attach(struct drm_bridge *bridge)
{
struct adv7511 *adv = bridge_to_adv7511(bridge);
@@ -912,6 +966,9 @@ static int adv7511_bridge_attach(struct drm_bridge *bridge)
&adv7511_connector_helper_funcs);
drm_mode_connector_attach_encoder(&adv->connector, bridge->encoder);
+ if (adv->type == ADV7533)
+ ret = adv7533_attach_dsi(adv);
+
return ret;
}
@@ -1009,6 +1066,41 @@ static int adv7511_parse_dt(struct device_node *np,
return 0;
}
+static int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
+{
+ u32 num_lanes;
+ struct device_node *endpoint;
+
+ of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
+
+ if (num_lanes < 1 || num_lanes > 4)
+ return -EINVAL;
+
+ adv->num_dsi_lanes = num_lanes;
+
+ endpoint = of_graph_get_next_endpoint(np, NULL);
+ if (!endpoint) {
+ DRM_ERROR("ADV7533 DSI input endpoint not found\n");
+ return -ENODEV;
+ }
+
+ adv->host_node = of_graph_get_remote_port_parent(endpoint);
+ if (!adv->host_node) {
+ DRM_ERROR("DSI host node not found\n");
+ of_node_put(endpoint);
+ return -ENODEV;
+ }
+
+ of_node_put(endpoint);
+ of_node_put(adv->host_node);
+
+ /* TODO: Check if these need to be parsed by DT or not */
+ adv->rgb = true;
+ adv->embedded_sync = false;
+
+ return 0;
+}
+
static const int edid_i2c_addr = 0x7e;
static const int packet_i2c_addr = 0x70;
static const int cec_i2c_addr = 0x78;
@@ -1038,11 +1130,12 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
memset(&link_config, 0, sizeof(link_config));
- if (adv7511->type == ADV7511) {
+ if (adv7511->type == ADV7511)
ret = adv7511_parse_dt(dev->of_node, &link_config);
- if (ret)
- return ret;
- }
+ else
+ ret = adv7533_parse_dt(dev->of_node, adv7511);
+ if (ret)
+ return ret;
/*
* The power down GPIO is optional. If present, toggle it from active to
@@ -1155,6 +1248,11 @@ static int adv7511_remove(struct i2c_client *i2c)
{
struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
+ if (adv7511->type == ADV7533) {
+ mipi_dsi_detach(adv7511->dsi);
+ mipi_dsi_device_unregister(adv7511->dsi);
+ }
+
drm_bridge_remove(&adv7511->bridge);
i2c_unregister_device(adv7511->i2c_cec);
@@ -1183,6 +1281,10 @@ static const struct of_device_id adv7511_of_ids[] = {
};
MODULE_DEVICE_TABLE(of, adv7511_of_ids);
+static struct mipi_dsi_driver adv7533_dsi_driver = {
+ .driver.name = "adv7533",
+};
+
static struct i2c_driver adv7511_driver = {
.driver = {
.name = "adv7511",
@@ -1193,7 +1295,21 @@ static struct i2c_driver adv7511_driver = {
.remove = adv7511_remove,
};
-module_i2c_driver(adv7511_driver);
+static int __init adv7511_init(void)
+{
+ mipi_dsi_driver_register(&adv7533_dsi_driver);
+
+ return i2c_add_driver(&adv7511_driver);
+}
+module_init(adv7511_init);
+
+static void __exit adv7511_exit(void)
+{
+ i2c_del_driver(&adv7511_driver);
+
+ mipi_dsi_driver_unregister(&adv7533_dsi_driver);
+}
+module_exit(adv7511_exit);
MODULE_AUTHOR("Lars-Peter Clausen <lars@xxxxxxxxxx>");
MODULE_DESCRIPTION("ADV7511 HDMI transmitter driver");
--
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