From: Jeremy Linton <[email protected]> ACPI configurations can now mark devices as noncoherent, support that choice.
NOTE: This is required to support USB on ARM Juno Development Board. Signed-off-by: Jeremy Linton <[email protected]> Signed-off-by: Suravee Suthikulpanit <[email protected]> CC: Bjorn Helgaas <[email protected]> CC: Catalin Marinas <[email protected]> CC: Rob Herring <[email protected]> CC: Will Deacon <[email protected]> CC: Rafael J. Wysocki <[email protected]> --- include/acpi/acpi_bus.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index d11eff8..0f131d2 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -407,7 +407,7 @@ static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent) * case 1. Do not support and disable DMA. * case 2. Support but rely on arch-specific cache maintenance for * non-coherence DMA operations. - * Currently, we implement case 1 above. + * Currently, we implement case 2 above. * * For the case when _CCA is missing (i.e. cca_seen=0) and * platform specifies ACPI_CCA_REQUIRED, we do not support DMA, @@ -415,7 +415,8 @@ static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent) * * See acpi_init_coherency() for more info. */ - if (adev->flags.coherent_dma) { + if (adev->flags.coherent_dma || + (adev->flags.cca_seen && IS_ENABLED(CONFIG_ARM64))) { ret = true; if (coherent) *coherent = adev->flags.coherent_dma; -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
