drm_client_setup.c

 1// SPDX-License-Identifier: MIT
 2
 3#include <linux/export.h>
 4
 5#include <drm/clients/drm_client_setup.h>
 6#include <drm/drm_device.h>
 7#include <drm/drm_drv.h>
 8#include <drm/drm_fourcc.h>
 9#include <drm/drm_print.h>
10
11#include "drm_client_internal.h"
12
13static char drm_client_default[16] = CONFIG_DRM_CLIENT_DEFAULT;
14module_param_string(active, drm_client_default, sizeof(drm_client_default), 0444);
15MODULE_PARM_DESC(active,
16		 "Choose which drm client to start, default is "
17		 CONFIG_DRM_CLIENT_DEFAULT);
18
19/**
20 * drm_client_setup() - Setup in-kernel DRM clients
21 * @dev: DRM device
22 * @format: Preferred pixel format for the device. Use NULL, unless
23 *          there is clearly a driver-preferred format.
24 *
25 * This function sets up the in-kernel DRM clients. Restore, hotplug
26 * events and teardown are all taken care of.
27 *
28 * Drivers should call drm_client_setup() after registering the new
29 * DRM device with drm_dev_register(). This function is safe to call
30 * even when there are no connectors present. Setup will be retried
31 * on the next hotplug event.
32 *
33 * The clients are destroyed by drm_dev_unregister().
34 */
35void drm_client_setup(struct drm_device *dev, const struct drm_format_info *format)
36{
37	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
38		drm_dbg(dev, "driver does not support mode-setting, skipping DRM clients\n");
39		return;
40	}
41
42#ifdef CONFIG_DRM_FBDEV_EMULATION
43	if (!strcmp(drm_client_default, "fbdev")) {
44		int ret;
45
46		ret = drm_fbdev_client_setup(dev, format);
47		if (ret)
48			drm_warn(dev, "Failed to set up DRM client; error %d\n", ret);
49		return;
50	}
51#endif
52
53#ifdef CONFIG_DRM_CLIENT_LOG
54	if (!strcmp(drm_client_default, "log")) {
55		drm_log_register(dev);
56		return;
57	}
58#endif
59	if (strcmp(drm_client_default, ""))
60		drm_warn(dev, "Unknown DRM client %s\n", drm_client_default);
61}
62EXPORT_SYMBOL(drm_client_setup);
63
64/**
65 * drm_client_setup_with_fourcc() - Setup in-kernel DRM clients for color mode
66 * @dev: DRM device
67 * @fourcc: Preferred pixel format as 4CC code for the device
68 *
69 * This function sets up the in-kernel DRM clients. It is equivalent
70 * to drm_client_setup(), but expects a 4CC code as second argument.
71 */
72void drm_client_setup_with_fourcc(struct drm_device *dev, u32 fourcc)
73{
74	drm_client_setup(dev, drm_format_info(fourcc));
75}
76EXPORT_SYMBOL(drm_client_setup_with_fourcc);
77
78/**
79 * drm_client_setup_with_color_mode() - Setup in-kernel DRM clients for color mode
80 * @dev: DRM device
81 * @color_mode: Preferred color mode for the device
82 *
83 * This function sets up the in-kernel DRM clients. It is equivalent
84 * to drm_client_setup(), but expects a color mode as second argument.
85 *
86 * Do not use this function in new drivers. Prefer drm_client_setup() with a
87 * format of NULL.
88 */
89void drm_client_setup_with_color_mode(struct drm_device *dev, unsigned int color_mode)
90{
91	u32 fourcc = drm_driver_color_mode_format(dev, color_mode);
92
93	drm_client_setup_with_fourcc(dev, fourcc);
94}
95EXPORT_SYMBOL(drm_client_setup_with_color_mode);
96
97MODULE_DESCRIPTION("In-kernel DRM clients");
98MODULE_LICENSE("GPL and additional rights");