ICX: dmaengine: ioatdma: disable DCA enabling on IOATDMA v3.4

commit 11e31e281bd8f482a9277268f7b0d9c213584271 upstream.

IOATDMA v3.4 does not support DCA. Disable
Signed-off-by: NDave Jiang <dave.jiang@intel.com>
Signed-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NLin Wang <lin.x.wang@intel.com>
Signed-off-by: NJeffle Xu <jefflexu@linux.alibaba.com>
Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>

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);

drivers/dma/ioat/init.c

@@ -1361,6 +1361,8 @@ 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;