Jocelyn Falempe
b593ea9406
Unfortunately, the G200 ioburst workaround doesn't work on some servers like Dell poweredge XR11, XR5610, or HPE XL260. In this case completely disabling WC is the only option to achieve low-latency. So this adds a new Kconfig option to disable WC mapping of the G200. Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20240517151050.624797-3-jfalempe@redhat.com
23 lines
863 B
Plaintext
23 lines
863 B
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config DRM_MGAG200
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tristate "Matrox G200"
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depends on DRM && PCI && MMU
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select DRM_GEM_SHMEM_HELPER
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select DRM_KMS_HELPER
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select I2C
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select I2C_ALGOBIT
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help
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This is a KMS driver for Matrox G200 chips. It supports the original
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MGA G200 desktop chips and the server variants. It requires 0.3.0
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of the modesetting userspace driver, and a version of mga driver
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that will fail on KMS enabled devices.
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config DRM_MGAG200_DISABLE_WRITECOMBINE
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bool "Disable Write Combine mapping of VRAM"
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depends on DRM_MGAG200 && PREEMPT_RT
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help
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The VRAM of the G200 is mapped with Write-Combine to improve
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performances. This can interfere with real-time tasks; even if they
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are running on other CPU cores than the graphics output.
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Enable this option only if you run realtime tasks on a server with a
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Matrox G200. |