Kconfig

  1# SPDX-License-Identifier: GPL-2.0-only
  2
  3config DRM_CLIENT_LIB
  4	tristate
  5	depends on DRM
  6	select DRM_KMS_HELPER if DRM_FBDEV_EMULATION
  7	select FB_CORE if DRM_FBDEV_EMULATION
  8	help
  9	  This option enables the DRM client library and selects all
 10	  modules and components according to the enabled clients.
 11
 12config DRM_CLIENT_SELECTION
 13	tristate
 14	depends on DRM
 15	select DRM_CLIENT_LIB if DRM_CLIENT_LOG
 16	select DRM_CLIENT_LIB if DRM_FBDEV_EMULATION
 17	help
 18	  Drivers that support in-kernel DRM clients have to select this
 19	  option.
 20
 21config DRM_CLIENT_SETUP
 22	bool
 23	depends on DRM_CLIENT_SELECTION
 24	help
 25	  Enables the DRM client selection. DRM drivers that support the
 26	  default clients should select DRM_CLIENT_SELECTION instead.
 27
 28menu "Supported DRM clients"
 29	depends on DRM_CLIENT_SELECTION
 30
 31config DRM_FBDEV_EMULATION
 32	bool "Enable legacy fbdev support for your modesetting driver"
 33	depends on DRM_CLIENT_SELECTION
 34	select DRM_CLIENT
 35	select DRM_CLIENT_SETUP
 36	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
 37	default FB
 38	help
 39	  Choose this option if you have a need for the legacy fbdev
 40	  support. Note that this support also provides the linux console
 41	  support on top of your modesetting driver.
 42
 43	  If in doubt, say "Y".
 44
 45config DRM_FBDEV_OVERALLOC
 46	int "Overallocation of the fbdev buffer"
 47	depends on DRM_FBDEV_EMULATION
 48	default 100
 49	help
 50	  Defines the fbdev buffer overallocation in percent. Default
 51	  is 100. Typical values for double buffering will be 200,
 52	  triple buffering 300.
 53
 54config DRM_FBDEV_LEAK_PHYS_SMEM
 55	bool "Shamelessly allow leaking of fbdev physical address (DANGEROUS)"
 56	depends on DRM_FBDEV_EMULATION && EXPERT
 57	default n
 58	help
 59	  In order to keep user-space compatibility, we want in certain
 60	  use-cases to keep leaking the fbdev physical address to the
 61	  user-space program handling the fbdev buffer.
 62	  This affects, not only, Amlogic, Allwinner or Rockchip devices
 63	  with ARM Mali GPUs using a userspace Blob.
 64	  This option is not supported by upstream developers and should be
 65	  removed as soon as possible and be considered as a broken and
 66	  legacy behaviour from a modern fbdev device driver.
 67
 68	  Please send any bug reports when using this to your proprietary
 69	  software vendor that requires this.
 70
 71	  If in doubt, say "N" or spread the word to your closed source
 72	  library vendor.
 73
 74config DRM_CLIENT_LOG
 75	bool "Print the kernel boot message on the screen"
 76	depends on DRM_CLIENT_SELECTION
 77	select DRM_CLIENT
 78	select DRM_CLIENT_SETUP
 79	select DRM_DRAW
 80	select FONT_SUPPORT
 81	help
 82	  This enable a drm logger, that will print the kernel messages to the
 83	  screen until the userspace is ready to take over.
 84
 85	  If you only need logs, but no terminal, or if you prefer userspace
 86	  terminal, say "Y".
 87
 88choice
 89	prompt "Default DRM Client"
 90	depends on DRM_CLIENT_SELECTION
 91	depends on DRM_FBDEV_EMULATION || DRM_CLIENT_LOG
 92	default DRM_CLIENT_DEFAULT_FBDEV
 93	help
 94	  Selects the default drm client.
 95
 96	  The selection made here can be overridden by using the kernel
 97	  command line 'drm_client_lib.active=fbdev' option.
 98
 99config DRM_CLIENT_DEFAULT_FBDEV
100	bool "fbdev"
101	depends on DRM_FBDEV_EMULATION
102	help
103	  Use fbdev emulation as default drm client. This is needed to have
104	  fbcon on top of a drm driver.
105
106config DRM_CLIENT_DEFAULT_LOG
107	bool "log"
108	depends on DRM_CLIENT_LOG
109	help
110	  Use drm log as default drm client. This will display boot logs on the
111	  screen, but doesn't implement a full terminal. For that you will need
112	  a userspace terminal using drm/kms.
113
114endchoice
115
116config DRM_CLIENT_DEFAULT
117       string
118       depends on DRM_CLIENT
119       default "fbdev" if DRM_CLIENT_DEFAULT_FBDEV
120       default "log" if DRM_CLIENT_DEFAULT_LOG
121       default ""
122
123endmenu