xref: /linux/drivers/gpu/drm/clients/Kconfig (revision 2c1ed907520c50326b8f604907a8478b27881a2e)

# SPDX-License-Identifier: GPL-2.0-only

config DRM_CLIENT_LIB
	tristate
	depends on DRM
	select DRM_KMS_HELPER if DRM_FBDEV_EMULATION
	select FB_CORE if DRM_FBDEV_EMULATION
	help
	  This option enables the DRM client library and selects all
	  modules and components according to the enabled clients.

config DRM_CLIENT_SELECTION
	tristate
	depends on DRM
	select DRM_CLIENT_LIB if DRM_CLIENT_LOG
	select DRM_CLIENT_LIB if DRM_FBDEV_EMULATION
	help
	  Drivers that support in-kernel DRM clients have to select this
	  option.

config DRM_CLIENT_SETUP
	bool
	depends on DRM_CLIENT_SELECTION
	help
	  Enables the DRM client selection. DRM drivers that support the
	  default clients should select DRM_CLIENT_SELECTION instead.

menu "Supported DRM clients"
	depends on DRM_CLIENT_SELECTION

config DRM_FBDEV_EMULATION
	bool "Enable legacy fbdev support for your modesetting driver"
	depends on DRM_CLIENT_SELECTION
	select DRM_CLIENT
	select DRM_CLIENT_SETUP
	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
	default FB
	help
	  Choose this option if you have a need for the legacy fbdev
	  support. Note that this support also provides the linux console
	  support on top of your modesetting driver.

	  If in doubt, say "Y".

config DRM_FBDEV_OVERALLOC
	int "Overallocation of the fbdev buffer"
	depends on DRM_FBDEV_EMULATION
	default 100
	help
	  Defines the fbdev buffer overallocation in percent. Default
	  is 100. Typical values for double buffering will be 200,
	  triple buffering 300.

config DRM_FBDEV_LEAK_PHYS_SMEM
	bool "Shamelessly allow leaking of fbdev physical address (DANGEROUS)"
	depends on DRM_FBDEV_EMULATION && EXPERT
	default n
	help
	  In order to keep user-space compatibility, we want in certain
	  use-cases to keep leaking the fbdev physical address to the
	  user-space program handling the fbdev buffer.
	  This affects, not only, Amlogic, Allwinner or Rockchip devices
	  with ARM Mali GPUs using a userspace Blob.
	  This option is not supported by upstream developers and should be
	  removed as soon as possible and be considered as a broken and
	  legacy behaviour from a modern fbdev device driver.

	  Please send any bug reports when using this to your proprietary
	  software vendor that requires this.

	  If in doubt, say "N" or spread the word to your closed source
	  library vendor.

config DRM_CLIENT_LOG
	bool "Print the kernel boot message on the screen"
	depends on DRM_CLIENT_SELECTION
	select DRM_CLIENT
	select DRM_CLIENT_SETUP
	select DRM_DRAW
	select FONT_SUPPORT
	help
	  This enable a drm logger, that will print the kernel messages to the
	  screen until the userspace is ready to take over.

	  If you only need logs, but no terminal, or if you prefer userspace
	  terminal, say "Y".

choice
	prompt "Default DRM Client"
	depends on DRM_CLIENT_SELECTION
	depends on DRM_FBDEV_EMULATION || DRM_CLIENT_LOG
	default DRM_CLIENT_DEFAULT_FBDEV
	help
	  Selects the default drm client.

	  The selection made here can be overridden by using the kernel
	  command line 'drm_client_lib.active=fbdev' option.

config DRM_CLIENT_DEFAULT_FBDEV
	bool "fbdev"
	depends on DRM_FBDEV_EMULATION
	help
	  Use fbdev emulation as default drm client. This is needed to have
	  fbcon on top of a drm driver.

config DRM_CLIENT_DEFAULT_LOG
	bool "log"
	depends on DRM_CLIENT_LOG
	help
	  Use drm log as default drm client. This will display boot logs on the
	  screen, but doesn't implement a full terminal. For that you will need
	  a userspace terminal using drm/kms.

endchoice

config DRM_CLIENT_DEFAULT
       string
       depends on DRM_CLIENT
       default "fbdev" if DRM_CLIENT_DEFAULT_FBDEV
       default "log" if DRM_CLIENT_DEFAULT_LOG
       default ""

endmenu