From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Suravee Suthikulpanit To: , , , , CC: , , , , , , , , Jeremy Linton , Suravee Suthikulpanit , Rob Herring Subject: [PATCH V4 1/8] acpi: Honor ACPI _CCA attribute setting Date: Wed, 21 Oct 2015 08:52:04 -0700 Message-ID: <1445442731-28819-2-git-send-email-Suravee.Suthikulpanit@amd.com> In-Reply-To: <1445442731-28819-1-git-send-email-Suravee.Suthikulpanit@amd.com> References: <1445442731-28819-1-git-send-email-Suravee.Suthikulpanit@amd.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-acpi-owner@vger.kernel.org List-ID: From: Jeremy Linton 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 Signed-off-by: Suravee Suthikulpanit CC: Bjorn Helgaas CC: Catalin Marinas CC: Rob Herring CC: Will Deacon CC: Rafael J. Wysocki --- 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 5ba8fb6..5a42204 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -395,7 +395,7 @@ 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, @@ -403,7 +403,8 @@ 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