Thomas Zimmermann f2fa5a99ca drm/ast: Convert ast to SHMEM ... Replace GEM VRAM helpers with GEM SHMEM helpers in ast. Avoids OOM errors when allocating video memory. Also adds support for dma-buf functionality. Aspeed display hardware supports display resolutions of FullHD and higher at 32-bit pixel depth. But the amount of video memory is in the range of 8 MiB to 32 MiB, which adds constraints to the actually available resolutions. As atomic modesetting with VRAM helpers requires double buffering in video memory, ast fails to pageflip in some configurations. For example, FullHD with an active cursor plane does not work on devices with 16 MiB of video memory. Resolve this problem by converting the ast driver to GEM SHMEM helpers. Keep the buffer objects in system memory and copy to video memory on pageflips via shadow-plane helpers. Userspace used to require shadow planes for decent performance, but that's now provided by the driver. To replace the memory management, the patch also implements damage handling for the primary plane. With GEM SHMEM helpers, dma-buf import and export is now supported by ast. This allows easier screen mirroring across devices or with an Aspeed-based BMC. A corresponding feature request is available at [1]. v2: * fix typos in commit message (Jocelyn) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Tested-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://lore.kernel.org/dri-devel/20220901124451.2523077-1-oushixiong@kylinos.cn/ # [1] Link: https://patchwork.freedesktop.org/patch/msgid/20221013112923.769-8-tzimmermann@suse.de		2022-10-16 11:16:50 +02:00
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ast_dp.c	drm/ast: Fixed the casting issue reported by sparse	2022-06-24 09:37:32 +02:00
ast_dp501.c	drm/ast: Support multiple outputs	2022-06-08 13:16:15 +02:00
ast_dram_tables.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ast_drv.c	drm/ast: Convert ast to SHMEM	2022-10-16 11:16:50 +02:00
ast_drv.h	drm/ast: Convert ast to SHMEM	2022-10-16 11:16:50 +02:00
ast_i2c.c	drm/ast: Move I2C code into separate source file	2021-12-16 12:29:22 +01:00
ast_main.c	drm/ast: Convert ast to SHMEM	2022-10-16 11:16:50 +02:00
ast_mm.c	drm/ast: Convert ast to SHMEM	2022-10-16 11:16:50 +02:00
ast_mode.c	drm/ast: Convert ast to SHMEM	2022-10-16 11:16:50 +02:00
ast_post.c	drm/ast: Support multiple outputs	2022-06-08 13:16:15 +02:00
ast_tables.h	drm/ast: Add resolution support for 1152x864@75	2022-09-20 10:19:32 +02:00
Kconfig	drm/ast: Convert ast to SHMEM	2022-10-16 11:16:50 +02:00
Makefile	drm/ast: Create the driver for ASPEED proprietory Display-Port	2022-05-03 16:04:03 +02:00