linux-kernel - [PATCH V2 1/4] Honor ACPI

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Date:	Wed, 26 Aug 2015 00:33:26 +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 V2 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

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