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| author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2017-08-07 12:29:49 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-08-07 14:28:51 +0200 |
| commit | 7ad4263980826e8b02e121af22f4f4c9103fe86d (patch) | |
| tree | 436c849f4eb9c25377579743121d8b956ae2e57d /drivers/acpi/acpi_video.c | |
| parent | ACPI: Introduce DMA ranges parsing (diff) | |
| download | linux-7ad4263980826e8b02e121af22f4f4c9103fe86d.tar.xz linux-7ad4263980826e8b02e121af22f4f4c9103fe86d.zip | |
ACPI: Make acpi_dma_configure() DMA regions aware
Current ACPI DMA configuration set-up device DMA capabilities through
kernel defaults that do not take into account platform specific DMA
configurations reported by firmware.
By leveraging the ACPI acpi_dev_get_dma_resources() API, add code
in acpi_dma_configure() to retrieve the DMA regions to correctly
set-up PCI devices DMA parameters.
Rework the ACPI IORT kernel API to make sure they can accommodate
the DMA set-up required by firmware. By making PCI devices DMA set-up
ACPI IORT specific, the kernel is shielded from unwanted regressions
that could be triggered by parsing DMA resources on arches that were
previously ignoring them (ie x86/ia64), leaving kernel behaviour
unchanged on those arches.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpi_video.c')
0 files changed, 0 insertions, 0 deletions