ioatdma: S1200 platforms ioatdma channel 2 and 3 falsely advertise RAID cap

This workaround checks for channel 2&3 and remove RAID cap.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dan Williams <djbw@fb.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 71e113dfc8cc..b00b000f238b 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -238,6 +238,18 @@ static bool is_bwd_ioat(struct pci_dev *pdev)
         }
 }
 
+static bool is_bwd_noraid(struct pci_dev *pdev)
+{
+        switch (pdev->device) {
+        case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
+        case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
+                return true;
+        default:
+                return false;
+        }
+
+}
+
 static void pq16_set_src(struct ioat_raw_descriptor *desc[3],
                         dma_addr_t addr, u32 offset, u8 coef, int idx)
 {
@@ -1808,6 +1820,9 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca)
 
         cap = readl(device->reg_base + IOAT_DMA_CAP_OFFSET);
 
+        if (is_bwd_noraid(pdev))
+                cap &= ~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS);
+
         /* dca is incompatible with raid operations */
         if (dca_en && (cap & (IOAT_CAP_XOR|IOAT_CAP_PQ)))
                 cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ);