Re: [PATCH 1/2] ahci: Check and set 64-bit DMA mask for platform AHCI driver

Suravee Suthikulanit <suravee.suthikulpanit@xxxxxxx> · Fri, 13 Jun 2014 07:45:12 -0500

On 6/12/2014 12:47 PM, Sergei Shtylyov wrote:

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?
Actually, I intended to say 64 since this is supposed to be setting up 
64-bit DMA mask. Or we could just say failed to set up DMA mask.

Suravee

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