27c9d80f51
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118 lines
3.3 KiB
Diff
118 lines
3.3 KiB
Diff
From 8a0b731a055fe663061231e1715f83bcd83be59d Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 28 Sep 2023 18:27:09 +0100
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Subject: [PATCH 0654/1085] drm: Look for an alias for the displays to use as
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the DRM device name
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Allow DT aliases of eg DSI2 to force make DRM allocate the
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display with the requested name.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/gpu/drm/drm_connector.c | 61 ++++++++++++++++++++++++++++++---
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1 file changed, 57 insertions(+), 4 deletions(-)
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--- a/drivers/gpu/drm/drm_connector.c
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+++ b/drivers/gpu/drm/drm_connector.c
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@@ -33,6 +33,7 @@
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#include <drm/drm_sysfs.h>
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#include <drm/drm_utils.h>
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+#include <linux/of.h>
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#include <linux/property.h>
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#include <linux/uaccess.h>
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@@ -83,6 +84,7 @@ struct drm_conn_prop_enum_list {
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int type;
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const char *name;
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struct ida ida;
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+ int first_dyn_num;
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};
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/*
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@@ -112,12 +114,41 @@ static struct drm_conn_prop_enum_list dr
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{ DRM_MODE_CONNECTOR_USB, "USB" },
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};
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+#define MAX_DT_NODE_NAME_LEN 20
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+#define DT_DRM_NODE_PREFIX "drm_"
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+
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+static void drm_connector_get_of_name(int type, char *node_name, int length)
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+{
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+ int i = 0;
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+
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+ strcpy(node_name, DT_DRM_NODE_PREFIX);
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+
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+ do {
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+ node_name[i + strlen(DT_DRM_NODE_PREFIX)] =
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+ tolower(drm_connector_enum_list[type].name[i]);
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+
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+ } while (drm_connector_enum_list[type].name[i++] &&
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+ i < length);
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+
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+ node_name[length - 1] = '\0';
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+}
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+
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void drm_connector_ida_init(void)
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{
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- int i;
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+ int i, id;
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+ char node_name[MAX_DT_NODE_NAME_LEN];
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- for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
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+ for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++) {
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ida_init(&drm_connector_enum_list[i].ida);
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+
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+ drm_connector_get_of_name(i, node_name, MAX_DT_NODE_NAME_LEN);
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+
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+ id = of_alias_get_highest_id(node_name);
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+ if (id > 0)
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+ drm_connector_enum_list[i].first_dyn_num = id + 1;
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+ else
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+ drm_connector_enum_list[i].first_dyn_num = 1;
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+ }
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}
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void drm_connector_ida_destroy(void)
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@@ -225,7 +256,9 @@ static int __drm_connector_init(struct d
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struct i2c_adapter *ddc)
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{
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struct drm_mode_config *config = &dev->mode_config;
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+ char node_name[MAX_DT_NODE_NAME_LEN];
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int ret;
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+ int id;
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struct ida *connector_ida =
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&drm_connector_enum_list[connector_type].ida;
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@@ -255,8 +288,28 @@ static int __drm_connector_init(struct d
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ret = 0;
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connector->connector_type = connector_type;
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- connector->connector_type_id =
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- ida_alloc_min(connector_ida, 1, GFP_KERNEL);
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+ connector->connector_type_id = 0;
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+
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+ drm_connector_get_of_name(connector_type, node_name, MAX_DT_NODE_NAME_LEN);
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+ id = of_alias_get_id(dev->dev->of_node, node_name);
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+ if (id > 0) {
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+ /* Try and allocate the requested ID
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+ * Valid range is 1 to 31, hence ignoring 0 as an error
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+ */
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+ int type_id = ida_alloc_range(connector_ida, id, id, GFP_KERNEL);
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+
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+ if (type_id > 0)
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+ connector->connector_type_id = type_id;
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+ else
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+ drm_err(dev, "Failed to acquire type ID %d for interface type %s, ret %d\n",
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+ id, drm_connector_enum_list[connector_type].name,
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+ type_id);
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+ }
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+ if (!connector->connector_type_id)
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+ connector->connector_type_id =
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+ ida_alloc_min(connector_ida,
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+ drm_connector_enum_list[connector_type].first_dyn_num,
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+ GFP_KERNEL);
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if (connector->connector_type_id < 0) {
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ret = connector->connector_type_id;
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goto out_put_id;
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