drm/fbdev: Add memory-agnostic fbdev client

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Add an fbdev client that can work with any memory manager. The
client implementation is the same as existing code in fbdev-dma or
fbdev-shmem.

Provide struct drm_driver.fbdev_probe for the new client to allocate
the surface GEM buffer. The new callback replaces fb_probe of struct
drm_fb_helper_funcs, which does the same.

To use the new client, DRM drivers set fbdev_probe in their struct
drm_driver instance and call drm_fbdev_client_setup(). Probing and
creating the fbdev surface buffer is now independent from the other
operations in struct drm_fb_helper. For the pixel format, the fbdev
client either uses a specified format, the value in preferred_depth
or 32-bit RGB.

v2:
- test for struct drm_fb_helper.funcs for NULL (Sui)
- respect struct drm_mode_config.preferred_depth for default format

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-4-tzimmermann@suse.de

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This commit is contained in:

Thomas Zimmermann 2024-09-24 09:12:01 +02:00

parent 02257549da

commit 5d08c44e47

5 changed files with 190 additions and 7 deletions

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4

drivers/gpu/drm/Makefile

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15

drivers/gpu/drm/drm_fb_helper.c

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141

drivers/gpu/drm/drm_fbdev_client.c

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18

include/drm/drm_drv.h

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19

include/drm/drm_fbdev_client.h

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