[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <1440597279-11802-2-git-send-email-Suravee.Suthikulpanit@amd.com>
Date: Wed, 26 Aug 2015 20:54:36 +0700
From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To: <bhelgaas@...gle.com>, <rjw@...ysocki.net>, <lenb@...nel.org>,
<catalin.marinas@....com>, <will.deacon@....com>
CC: <hanjun.guo@...aro.org>, <linux-acpi@...r.kernel.org>,
<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
Jeremy Linton <jeremy.linton@....com>,
Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
Rob Herring <robh+dt@...nel.org>
Subject: [PATCH V3 1/4] Honor ACPI _CCA attribute setting
From: Jeremy Linton <jeremy.linton@....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@....com>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
CC: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Catalin Marinas <catalin.marinas@....com>
CC: Rob Herring <robh+dt@...nel.org>
CC: Will Deacon <will.deacon@....com>
CC: Rafael J. Wysocki <rjw@...ysocki.net>
---
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 83061ca..7ecb8e4 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -399,7 +399,7 @@ 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,
@@ -407,7 +407,8 @@ 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 majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists