ioatdma: skip legacy reset bits since v3.3 plattform doesn't need it
Make it so only 3.2 and earlier platform need the PCI config register
clearings since this implementation does not have the registers.
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>
diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 65b912a..804522c 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -1331,20 +1331,28 @@
chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET);
- /* 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");
- return err;
- }
- pci_write_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, chanerr);
+ if (device->version < IOAT_VER_3_3) {
+ /* 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");
+ return err;
+ }
+ pci_write_config_dword(pdev,
+ IOAT_PCI_CHANERR_INT_OFFSET, chanerr);
- /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit
- * (workaround for spurious config parity error after restart)
- */
- pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id);
- if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0)
- pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10);
+ /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit
+ * (workaround for spurious config parity error after restart)
+ */
+ pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id);
+ if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) {
+ pci_write_config_dword(pdev,
+ IOAT_PCI_DMAUNCERRSTS_OFFSET,
+ 0x10);
+ }
+ }
err = ioat2_reset_sync(chan, msecs_to_jiffies(200));
if (err) {