forked from Minki/linux
63ec0119d3
Allows e.g. power management daemons to control the backlight level. Inspired by the corresponding code in radeonfb. [mjg@redhat.com: updated to add backlight type and make the connector the parent device] Signed-off-by: Michel Dänzer <michel@daenzer.net> Signed-off-by: Matthew Garrett <mjg@redhat.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: David Airlie <airlied@linux.ie> Acked-by: Alex Deucher <alexdeucher@gmail.com> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Tested-by: Sedat Dilek <sedat.dilek@googlemail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
39 lines
1.9 KiB
Plaintext
39 lines
1.9 KiB
Plaintext
config DRM_RADEON_KMS
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bool "Enable modesetting on radeon by default - NEW DRIVER"
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depends on DRM_RADEON
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select BACKLIGHT_CLASS_DEVICE
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help
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Choose this option if you want kernel modesetting enabled by default.
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This is a completely new driver. It's only part of the existing drm
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for compatibility reasons. It requires an entirely different graphics
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stack above it and works very differently from the old drm stack.
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i.e. don't enable this unless you know what you are doing it may
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cause issues or bugs compared to the previous userspace driver stack.
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When kernel modesetting is enabled the IOCTL of radeon/drm
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driver are considered as invalid and an error message is printed
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in the log and they return failure.
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KMS enabled userspace will use new API to talk with the radeon/drm
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driver. The new API provide functions to create/destroy/share/mmap
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buffer object which are then managed by the kernel memory manager
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(here TTM). In order to submit command to the GPU the userspace
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provide a buffer holding the command stream, along this buffer
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userspace have to provide a list of buffer object used by the
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command stream. The kernel radeon driver will then place buffer
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in GPU accessible memory and will update command stream to reflect
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the position of the different buffers.
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The kernel will also perform security check on command stream
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provided by the user, we want to catch and forbid any illegal use
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of the GPU such as DMA into random system memory or into memory
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not owned by the process supplying the command stream. This part
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of the code is still incomplete and this why we propose that patch
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as a staging driver addition, future security might forbid current
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experimental userspace to run.
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This code support the following hardware : R1XX,R2XX,R3XX,R4XX,R5XX
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(radeon up to X1950). Works is underway to provide support for R6XX,
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R7XX and newer hardware (radeon from HD2XXX to HD4XXX).
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