From 11e31e281bd8f482a9277268f7b0d9c213584271 Mon Sep 17 00:00:00 2001
From: Dave Jiang <dave.jiang@intel.com>
Date: Fri, 22 Feb 2019 09:59:59 -0700
Subject: [PATCH] dmaengine: ioatdma: disable DCA enabling on IOATDMA v3.4
Git-commit: 11e31e281bd8f482a9277268f7b0d9c213584271
Patch-mainline: v5.1-rc1
References: jsc#SLE-5442
IOATDMA v3.4 does not support DCA. Disable
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/dma/ioat/hw.h | 1 +
drivers/dma/ioat/init.c | 2 ++
2 files changed, 3 insertions(+)
diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h
index 3e38877cae6b..781c94de8e81 100644
--- a/drivers/dma/ioat/hw.h
+++ b/drivers/dma/ioat/hw.h
@@ -73,6 +73,7 @@
#define IOAT_VER_3_0 0x30 /* Version 3.0 */
#define IOAT_VER_3_2 0x32 /* Version 3.2 */
#define IOAT_VER_3_3 0x33 /* Version 3.3 */
+#define IOAT_VER_3_4 0x34 /* Version 3.4 */
int system_has_dca_enabled(struct pci_dev *pdev);
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index 3161dfbca505..58dd1bfd3edd 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -1353,6 +1353,8 @@ static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_drvdata(pdev, device);
device->version = readb(device->reg_base + IOAT_VER_OFFSET);
+ if (device->version >= IOAT_VER_3_4)
+ ioat_dca_enabled = 0;
if (device->version >= IOAT_VER_3_0) {
if (is_skx_ioat(pdev))
device->version = IOAT_VER_3_2;
--
2.16.4