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

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / dma / ioat / dma_v3.c

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 71e113dfc8cc0ab26c8b501ceea28179487b2340..b00b000f238b1f183219c0ac6d423e7336b9680c 100644 (file)
--- 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);