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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2021-04-30 12:58:35 +0200 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2021-05-01 12:45:04 +0200 |
| commit | 11e8f5fd223bd4d33fa10527bad3fe48469a15df (patch) | |
| tree | 6cddaf3aac470d7fc425fbfb8226fb987f8357d7 /drivers/gpu/drm/tiny/Kconfig | |
| parent | 730e7992dc1beedf2c33001cc0d791c3cdf6c842 (diff) | |
| download | lwn-11e8f5fd223bd4d33fa10527bad3fe48469a15df.tar.gz lwn-11e8f5fd223bd4d33fa10527bad3fe48469a15df.zip | |
drm: Add simpledrm driver
The simpledrm driver is a DRM driver for simple-framebuffer framebuffers
as provided by the kernel's boot code. This driver enables basic
graphical output on many different graphics devices that are provided
by the platform (e.g., EFI, VESA, embedded framebuffers).
With the kernel's simple-framebuffer infrastructure, the kernel receives
a pre-configured framebuffer from the system (i.e., firmware, boot
loader). It creates a platform device to which simpledrm attaches.
The system's framebuffer consists of a memory range, size and format.
Based on these values, simpledrm creates a DRM devices. No actual
modesetting is possible.
A firmware framebuffer might also be specified via device-tree files. If
no device platform data is given, try the DT device node.
Make sure required hardware clocks and regulators are enabled while the
firmware framebuffer is in use. The basic code has been taken from the
simplefb driver and adapted to DRM. Clocks are released automatically
via devres helpers.
The drivers displays a console on simpledrm's framebuffer. The default
framebuffer format is being used.
v4:
* disable simplefb if simpledrm has been selected (Maxime)
v3:
* add disable function that clears screen to black (Daniel)
* set shadow buffering only for fbdev emulation
* set platform-driver data during device creation
v2:
* rename driver to simpledrm
* add dri-devel to MAINTAINERS entry
* put native format first in primary-plane format list (Daniel)
* inline simplekms_device_cleanup() (Daniel)
* use helpers for shadow-buffered planes
* fix whitespace errors
* add Device Tree match table
* clean-up parser wrappers
* use strscpy()
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> # fbdev support
Acked-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: nerdopolis <bluescreen_avenger@verizon.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-5-tzimmermann@suse.de
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-6-tzimmermann@suse.de
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-7-tzimmermann@suse.de
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-8-tzimmermann@suse.de
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-9-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/tiny/Kconfig')
| -rw-r--r-- | drivers/gpu/drm/tiny/Kconfig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig index 9bbaa1a69050..d46f95d9196d 100644 --- a/drivers/gpu/drm/tiny/Kconfig +++ b/drivers/gpu/drm/tiny/Kconfig @@ -38,6 +38,22 @@ config DRM_GM12U320 This is a KMS driver for projectors which use the GM12U320 chipset for video transfer over USB2/3, such as the Acer C120 mini projector. +config DRM_SIMPLEDRM + tristate "Simple framebuffer driver" + depends on DRM + select DRM_GEM_SHMEM_HELPER + select DRM_KMS_HELPER + help + DRM driver for simple platform-provided framebuffers. + + This driver assumes that the display hardware has been initialized + by the firmware or bootloader before the kernel boots. Scanout + buffer, size, and display format must be provided via device tree, + UEFI, VESA, etc. + + On x86 and compatible, you should also select CONFIG_X86_SYSFB to + use UEFI and VESA framebuffers. + config TINYDRM_HX8357D tristate "DRM support for HX8357D display panels" depends on DRM && SPI |