linux-kernel - [PATCH 1/1] ata: Check and set 64-bit DMA mask for platform AHCI driver

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Date:	Fri, 23 May 2014 12:35:10 -0500
From:	<suravee.suthikulpanit@....com>
To:	<tj@...nel.org>
CC:	<linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"Suravee Suthikulpanit" <Suravee.Suthikulpanit@....com>
Subject: [PATCH 1/1] ata: Check and set 64-bit DMA mask for platform AHCI driver

From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>

The current platform AHCI drier does not set the dma_mask correctly
for 64-bit DMA capable AHCI controller.  This patch checks the AHCI
capability bit and set the dma_mask and coherent_dma_mask accordingly.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
---
 drivers/ata/libahci_platform.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 7cb3a85..85049ef 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -368,6 +368,15 @@ int ahci_platform_init_host(struct platform_device *pdev,
 	ahci_init_controller(host);
 	ahci_print_info(host, "platform");
 
+	if (hpriv->cap & HOST_CAP_64) {
+		if (!dev->dma_mask)
+			dev->dma_mask = &dev->coherent_dma_mask;
+
+		rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
+		if (rc)
+			return rc;
+	}
+
 	return ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 				 &ahci_platform_sht);
 }
-- 
1.9.0

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