drm/i915/opregion: let user specify override VBT via firmware load

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Sometimes it would be most enlightening to debug systems by replacing
the VBT to be used. For example, in the referenced bug the BIOS provides
different VBT depending on the boot mode (UEFI vs. legacy). It would be
interesting to try the failing boot mode with the VBT from the working
boot, and see if that makes a difference.

Add a module parameter to load the VBT using the firmware loader, not
unlike the EDID firmware mechanism.

As a starting point for experimenting, one can pick up the BIOS provided
VBT from /sys/kernel/debug/dri/0/i915_opregion/i915_vbt.

v2: clarify firmware load return value check (Bob)

v3: kfree the loaded firmware blob

References: https://bugs.freedesktop.org/show_bug.cgi?id=97822#c83
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170817115209.25912-1-jani.nikula@intel.com

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This commit is contained in:

Jani Nikula 2017-08-17 14:52:09 +03:00

parent a029fa4d75

commit ab3595bc4f

4 changed files with 51 additions and 0 deletions

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1

drivers/gpu/drm/i915/i915_drv.h

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4

drivers/gpu/drm/i915/i915_params.c

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1

drivers/gpu/drm/i915/i915_params.h

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45

drivers/gpu/drm/i915/intel_opregion.c

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