From 6ead7e484957f2ae9bf2085688518d95ce75ab80 Mon Sep 17 00:00:00 2001 From: Dave Jiang Date: Tue, 26 Mar 2013 15:42:59 -0700 Subject: 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 Acked-by: Dan Williams Signed-off-by: Vinod Koul --- drivers/dma/ioat/dma_v3.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-) (limited to 'drivers/dma/ioat') diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 65b912aa101..804522c1300 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -1331,20 +1331,28 @@ 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); - /* 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) { -- cgit v1.2.3