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drm: Look for an alias for the displays to use as the DRM device name

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Allow DT aliases of eg DSI2 to force make DRM allocate the
display with the requested name.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dave Stevenson
2023-09-28 18:27:09 +01:00
committed by Dom Cobley
parent 9d603d1c70
commit a2bf9deb64
1 changed files with 57 additions and 4 deletions
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59
drivers/gpu/drm/drm_connector.c
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@@ -33,6 +33,7 @@
#include <drm/drm_sysfs.h>
#include <drm/drm_utils.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/uaccess.h>
@@ -83,6 +84,7 @@ struct drm_conn_prop_enum_list {
int type;
const char *name;
struct ida ida;
int first_dyn_num;
};
/*
@@ -112,12 +114,41 @@ static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
{ DRM_MODE_CONNECTOR_USB, "USB" },
};
#define MAX_DT_NODE_NAME_LEN 20
#define DT_DRM_NODE_PREFIX "drm_"
static void drm_connector_get_of_name(int type, char *node_name, int length)
{
int i = 0;
strcpy(node_name, DT_DRM_NODE_PREFIX);
do {
node_name[i + strlen(DT_DRM_NODE_PREFIX)] =
tolower(drm_connector_enum_list[type].name[i]);
} while (drm_connector_enum_list[type].name[i++] &&
i < length);
node_name[length - 1] = '\0';
}
void drm_connector_ida_init(void)
{
int i;
int i, id;
char node_name[MAX_DT_NODE_NAME_LEN];
for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++) {
ida_init(&drm_connector_enum_list[i].ida);
drm_connector_get_of_name(i, node_name, MAX_DT_NODE_NAME_LEN);
id = of_alias_get_highest_id(node_name);
if (id > 0)
drm_connector_enum_list[i].first_dyn_num = id + 1;
else
drm_connector_enum_list[i].first_dyn_num = 1;
}
}
void drm_connector_ida_destroy(void)
@@ -225,7 +256,9 @@ static int __drm_connector_init(struct drm_device *dev,
struct i2c_adapter *ddc)
{
struct drm_mode_config *config = &dev->mode_config;
char node_name[MAX_DT_NODE_NAME_LEN];
int ret;
int id;
struct ida *connector_ida =
&drm_connector_enum_list[connector_type].ida;
@@ -255,8 +288,28 @@ static int __drm_connector_init(struct drm_device *dev,
ret = 0;
connector->connector_type = connector_type;
connector->connector_type_id = 0;
drm_connector_get_of_name(connector_type, node_name, MAX_DT_NODE_NAME_LEN);
id = of_alias_get_id(dev->dev->of_node, node_name);
if (id > 0) {
/* Try and allocate the requested ID
* Valid range is 1 to 31, hence ignoring 0 as an error
*/
int type_id = ida_alloc_range(connector_ida, id, id, GFP_KERNEL);
if (type_id > 0)
connector->connector_type_id = type_id;
else
drm_err(dev, "Failed to acquire type ID %d for interface type %s, ret %d\n",
id, drm_connector_enum_list[connector_type].name,
type_id);
}
if (!connector->connector_type_id)
connector->connector_type_id =
ida_alloc_min(connector_ida, 1, GFP_KERNEL);
ida_alloc_min(connector_ida,
drm_connector_enum_list[connector_type].first_dyn_num,
GFP_KERNEL);
if (connector->connector_type_id < 0) {
ret = connector->connector_type_id;
goto out_put_id;