Patch "ata: ahci_mvebu: Fix wrongly set base address for the MBus window setting" has been added to the 4.0-stable tree

This is a note to let you know that I've just added the patch titled

ata: ahci_mvebu: Fix wrongly set base address for the MBus window setting

to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ata-ahci_mvebu-fix-wrongly-set-base-address-for-the-mbus-window-setting.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nadav Haklai <[email protected]>
Date: Tue, 26 May 2015 18:47:23 +0200
Subject: ata: ahci_mvebu: Fix wrongly set base address for the MBus window setting

From: Nadav Haklai <[email protected]>

commit e96998fc200867f005dd14c7d1dd35e1107d4914 upstream.

According to the Armada 38x datasheet, the window base address registers value is set in bits [31:4] of the register and corresponds to the transaction address bits [47:20].

Therefore, the 32bit base address value should be shifted right by 20bits and left by 4bits, resulting in 16 bit shift right.

The bug as not been noticed yet because if the memory available on the platform is less than 2GB, then the base address is zero.

[[email protected]: add extra-explanation]

AHCI interfaces)

---
 drivers/ata/ahci_mvebu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -45,7 +45,7 @@ static void ahci_mvebu_mbus_config(struc
 		writel((cs->mbus_attr << 8) |
 		       (dram->mbus_dram_target_id << 4) | 1,
 		       hpriv->mmio + AHCI_WINDOW_CTRL(i));
-		writel(cs->base, hpriv->mmio + AHCI_WINDOW_BASE(i));
+		writel(cs->base >> 16, hpriv->mmio + AHCI_WINDOW_BASE(i));
 		writel(((cs->size - 1) & 0xffff0000),
 		       hpriv->mmio + AHCI_WINDOW_SIZE(i));
 	}

Patches currently in stable-queue which might be from [email protected] are

queue-4.0/ata-ahci_mvebu-fix-wrongly-set-base-address-for-the-mbus-window-setting.patch --
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