drivers/gpu/drm/clients/Kconfig

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/clients/Kconfig

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/clients/Kconfig
Extension
[no extension]
Size
3729 bytes
Lines
124
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: build/configuration rule
Status
atlas-only

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

# 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.

Annotation

Implementation Notes