Re: [PATCH 1/2] ahci: Check and set 64-bit DMA mask for platform AHCI driver
From: Sergei Shtylyov
Date: Thu Jun 12 2014 - 13:47:28 EST
Hello.
On 06/12/2014 09:40 PM, suravee.suthikulpanit@xxxxxxx wrote:
From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
The current platform AHCI driver 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@xxxxxxx>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/ata/libahci_platform.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 3a5b4ed..a958a2b 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -364,6 +364,19 @@ int ahci_platform_init_host(struct platform_device *pdev,
ap->ops = &ata_dummy_port_ops;
}
+ if (hpriv->cap & HOST_CAP_64) {
+ rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
+ if (rc) {
+ rc = dma_coerce_mask_and_coherent(dev,
+ DMA_BIT_MASK(32));
+ if (rc) {
+ dev_err(dev, "Failed to enable 64-bit DMA.\n");
Not 32-bit?
+ return rc;
+ }
+ dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n");
+ }
+ }
+
WBR, Sergei
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