Il 09/01/23 09:40, Pin-yen Lin ha scritto:
Add helpers to register and unregister Type-C "switches" for bridges
capable of switching their output between two downstream devices.
The helper registers USB Type-C mode switches when the "mode-switch"
and the "data-lanes" properties are available in Device Tree.
Signed-off-by: Pin-yen Lin <treapk...@chromium.org>
---
(no changes since v8)
Changes in v8:
- Fixed the build issue when CONFIG_TYPEC=m
- Fixed some style issues
Changes in v7:
- Extracted the common codes to a helper function
- New in v7
drivers/gpu/drm/display/drm_dp_helper.c | 132 ++++++++++++++++++++++++
include/drm/display/drm_dp_helper.h | 16 +++
2 files changed, 148 insertions(+)
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c
b/drivers/gpu/drm/display/drm_dp_helper.c
index 16565a0a5da6..fb9e23744c08 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -30,11 +30,13 @@
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/string_helpers.h>
+#include <linux/usb/typec_mux.h>
#include <linux/dynamic_debug.h>
#include <drm/display/drm_dp_helper.h>
#include <drm/display/drm_dp_mst_helper.h>
#include <drm/drm_edid.h>
+#include <drm/drm_of.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
#include <drm/drm_panel.h>
@@ -3891,3 +3893,133 @@ int drm_panel_dp_aux_backlight(struct drm_panel *panel,
struct drm_dp_aux *aux)
EXPORT_SYMBOL(drm_panel_dp_aux_backlight);
#endif
+
+#if IS_REACHABLE(CONFIG_TYPEC)
+static int drm_dp_register_mode_switch(struct device *dev, struct device_node
*node,
+ struct drm_dp_typec_switch_desc
*switch_desc,
+ void *data, void *mux_set)
+{
+ struct drm_dp_typec_port_data *port_data;
+ struct typec_mux_desc mux_desc = {};
+ char name[32];
+ u32 dp_lanes[2];
+ int ret, num_lanes, port_num = -1;
+
+ num_lanes = drm_of_get_data_lanes_count(node, 0, 2);
+ if (num_lanes <= 0) {
+ dev_err(dev, "Error on getting data lanes count: %d\n",
+ num_lanes);
+ return num_lanes;
+ }
+
+ ret = of_property_read_u32_array(node, "data-lanes", dp_lanes,
num_lanes);
+ if (ret) {
+ dev_err(dev, "Failed to read the data-lanes variable: %d\n",
+ ret);
+ return ret;
+ }
+
+ port_num = dp_lanes[0] / 2;
+
+ port_data = &switch_desc->typec_ports[port_num];
+ port_data->data = data;
+ mux_desc.fwnode = &node->fwnode;
+ mux_desc.drvdata = port_data;
+ snprintf(name, sizeof(name), "%s-%u", node->name, port_num);
+ mux_desc.name = name;
+ mux_desc.set = mux_set;
+
+ port_data->typec_mux = typec_mux_register(dev, &mux_desc);
+ if (IS_ERR(port_data->typec_mux)) {
I would propose, instead...
+ ret = PTR_ERR(port_data->typec_mux);
+ dev_err(dev, "Mode switch register for port %d failed: %d\n",
+ port_num, ret);
return ret;
+ }
+
+ return ret;
return 0;
+}
+
...but I don't have strong opinions, so regardless of that:
Reviewed-by: AngeloGioacchino Del Regno
<angelogioacchino.delre...@collabora.com>
