diff mbox

[V4,1/8] acpi: Honor ACPI _CCA attribute setting

Message ID 1445442731-28819-2-git-send-email-Suravee.Suthikulpanit@amd.com
State Not Applicable
Headers show

Commit Message

Suravee Suthikulpanit Oct. 21, 2015, 3:52 p.m. UTC 
From: Jeremy Linton <jeremy.linton@arm.com>

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 <jeremy.linton@arm.com>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Rob Herring <robh+dt@kernel.org>
CC: Will Deacon <will.deacon@arm.com>
CC: Rafael J. Wysocki <rjw@rjwysocki.net>
---
 include/acpi/acpi_bus.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Comments

Bjorn Helgaas Oct. 27, 2015, 2:41 p.m. UTC | #1 
From "git log --oneline include/acpi/acpi_bus.h", I see the convention is
to capitalize "ACPI:" in the summary (also applies to other patches in this
series).

On Wed, Oct 21, 2015 at 08:52:04AM -0700, Suravee Suthikulpanit wrote:
> From: Jeremy Linton <jeremy.linton@arm.com>
> 
> 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 <jeremy.linton@arm.com>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
> CC: Bjorn Helgaas <bhelgaas@google.com>
> CC: Catalin Marinas <catalin.marinas@arm.com>
> CC: Rob Herring <robh+dt@kernel.org>
> CC: Will Deacon <will.deacon@arm.com>
> CC: Rafael J. Wysocki <rjw@rjwysocki.net>
> ---
>  include/acpi/acpi_bus.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
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diff mbox

Patch

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;