This is a note to let you know that I've just added the patch titled
ahci: disable MSI instead of NCQ on Samsung pci-e SSDs on macbooks
to the 3.17-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:
ahci-disable-msi-instead-of-ncq-on-samsung-pci-e-ssds-on-macbooks.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 66a7cbc303f4d28f201529b06061944d51ab530c Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@xxxxxxxxxx>
Date: Mon, 27 Oct 2014 10:22:56 -0400
Subject: ahci: disable MSI instead of NCQ on Samsung pci-e SSDs on macbooks
From: Tejun Heo <tj@xxxxxxxxxx>
commit 66a7cbc303f4d28f201529b06061944d51ab530c upstream.
Samsung pci-e SSDs on macbooks failed miserably on NCQ commands, so
67809f85d31e ("ahci: disable NCQ on Samsung pci-e SSDs on macbooks")
disabled NCQ on them. It turns out that NCQ is fine as long as MSI is
not used, so let's turn off MSI and leave NCQ on.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=60731
Tested-by: <dorin@xxxxxxx>
Tested-by: Imre Kaloz <kaloz@xxxxxxxxxxx>
Fixes: 67809f85d31e ("ahci: disable NCQ on Samsung pci-e SSDs on macbooks")
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/ata/ahci.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -60,6 +60,7 @@ enum board_ids {
/* board IDs by feature in alphabetical order */
board_ahci,
board_ahci_ign_iferr,
+ board_ahci_nomsi,
board_ahci_noncq,
board_ahci_nosntf,
board_ahci_yes_fbs,
@@ -121,6 +122,13 @@ static const struct ata_port_info ahci_p
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_ops,
},
+ [board_ahci_nomsi] = {
+ AHCI_HFLAGS (AHCI_HFLAG_NO_MSI),
+ .flags = AHCI_FLAG_COMMON,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_ops,
+ },
[board_ahci_noncq] = {
AHCI_HFLAGS (AHCI_HFLAG_NO_NCQ),
.flags = AHCI_FLAG_COMMON,
@@ -480,10 +488,10 @@ static const struct pci_device_id ahci_p
{ PCI_VDEVICE(ASMEDIA, 0x0612), board_ahci }, /* ASM1062 */
/*
- * Samsung SSDs found on some macbooks. NCQ times out.
- * https://bugzilla.kernel.org/show_bug.cgi?id=60731
+ * Samsung SSDs found on some macbooks. NCQ times out if MSI is
+ * enabled. https://bugzilla.kernel.org/show_bug.cgi?id=60731
*/
- { PCI_VDEVICE(SAMSUNG, 0x1600), board_ahci_noncq },
+ { PCI_VDEVICE(SAMSUNG, 0x1600), board_ahci_nomsi },
/* Enmotus */
{ PCI_DEVICE(0x1c44, 0x8000), board_ahci },
Patches currently in stable-queue which might be from tj@xxxxxxxxxx are
queue-3.17/ahci-add-device-ids-for-intel-sunrise-point-pch.patch
queue-3.17/ahci-disable-msi-instead-of-ncq-on-samsung-pci-e-ssds-on-macbooks.patch
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