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f7b42442c4
drm_log is a simple logger that uses the drm_client API to print the kmsg boot log on the screen. This is not a full replacement to fbcon, as it will only print the kmsg. It will never handle user input, or a terminal because this is better done in userspace. Design decisions: * It uses the drm_client API, so it should work on all drm drivers from the start. * It doesn't scroll the message, that way it doesn't need to redraw the whole screen for each new message. It also means it doesn't have to keep drawn messages in memory, to redraw them when scrolling. * It uses the new non-blocking console API, so it should work well with PREEMPT_RT. This patch also adds a Kconfig menu to select the drm client to use. It can be overwritten on the kernel command line with: drm_client_lib.active=log or drm_client_lib.active=fbdev Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com> Reviewed-by: John Ogness <john.ogness@linutronix.de> # console API Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20241204160014.1171469-3-jfalempe@redhat.com
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
// SPDX-License-Identifier: MIT
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#include <drm/clients/drm_client_setup.h>
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#include <drm/drm_device.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_print.h>
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#include "drm_client_internal.h"
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static char drm_client_default[16] = CONFIG_DRM_CLIENT_DEFAULT;
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module_param_string(active, drm_client_default, sizeof(drm_client_default), 0444);
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MODULE_PARM_DESC(active,
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"Choose which drm client to start, default is"
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CONFIG_DRM_CLIENT_DEFAULT "]");
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/**
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* drm_client_setup() - Setup in-kernel DRM clients
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* @dev: DRM device
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* @format: Preferred pixel format for the device. Use NULL, unless
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* there is clearly a driver-preferred format.
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*
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* This function sets up the in-kernel DRM clients. Restore, hotplug
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* events and teardown are all taken care of.
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*
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* Drivers should call drm_client_setup() after registering the new
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* DRM device with drm_dev_register(). This function is safe to call
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* even when there are no connectors present. Setup will be retried
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* on the next hotplug event.
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*
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* The clients are destroyed by drm_dev_unregister().
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*/
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void drm_client_setup(struct drm_device *dev, const struct drm_format_info *format)
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{
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#ifdef CONFIG_DRM_FBDEV_EMULATION
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if (!strcmp(drm_client_default, "fbdev")) {
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int ret;
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ret = drm_fbdev_client_setup(dev, format);
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if (ret)
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drm_warn(dev, "Failed to set up DRM client; error %d\n", ret);
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return;
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}
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#endif
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#ifdef CONFIG_DRM_CLIENT_LOG
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if (!strcmp(drm_client_default, "log")) {
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drm_log_register(dev);
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return;
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}
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#endif
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if (strcmp(drm_client_default, ""))
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drm_warn(dev, "Unknown DRM client %s\n", drm_client_default);
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}
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EXPORT_SYMBOL(drm_client_setup);
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/**
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* drm_client_setup_with_fourcc() - Setup in-kernel DRM clients for color mode
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* @dev: DRM device
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* @fourcc: Preferred pixel format as 4CC code for the device
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*
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* This function sets up the in-kernel DRM clients. It is equivalent
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* to drm_client_setup(), but expects a 4CC code as second argument.
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*/
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void drm_client_setup_with_fourcc(struct drm_device *dev, u32 fourcc)
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{
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drm_client_setup(dev, drm_format_info(fourcc));
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}
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EXPORT_SYMBOL(drm_client_setup_with_fourcc);
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/**
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* drm_client_setup_with_color_mode() - Setup in-kernel DRM clients for color mode
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* @dev: DRM device
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* @color_mode: Preferred color mode for the device
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*
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* This function sets up the in-kernel DRM clients. It is equivalent
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* to drm_client_setup(), but expects a color mode as second argument.
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*
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* Do not use this function in new drivers. Prefer drm_client_setup() with a
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* format of NULL.
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*/
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void drm_client_setup_with_color_mode(struct drm_device *dev, unsigned int color_mode)
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{
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u32 fourcc = drm_driver_color_mode_format(dev, color_mode);
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drm_client_setup_with_fourcc(dev, fourcc);
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}
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EXPORT_SYMBOL(drm_client_setup_with_color_mode);
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MODULE_DESCRIPTION("In-kernel DRM clients");
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MODULE_LICENSE("GPL and additional rights");
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