ioat: remove chanerr mask setting for IOAT v3.x

The existing code set a value in the PCI_CHANERRMSK_INT register
for a workaround to address a pre-silicon bug on the Intel 5520 IO hub that
has been fixed when the hardware was released. There is no need for this
code.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <djbw@fb.com>

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 9d6f3bb..e52cf1e 100644 (file)
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -1168,12 +1168,7 @@ static int ioat3_reset_hw(struct ioat_chan_common *chan)
        chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
        writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET);
 
-       /* -= IOAT ver.3 workarounds =- */
-       /* Write CHANERRMSK_INT with 3E07h to mask out the errors
-        * that can cause stability issues for IOAT ver.3, and clear any
-        * pending errors
-        */
-       pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07);
+       /* clear any pending errors */
        err = pci_read_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, &chanerr);
        if (err) {
                dev_err(&pdev->dev, "channel error register unreachable\n");