Commit d302398d authored by Dave Jiang's avatar Dave Jiang Committed by Vinod Koul
Browse files

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: default avatarDave Jiang <dave.jiang@intel.com>
Acked-by: default avatarDan Williams <djbw@fb.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 7727eaa4

drivers/dma/ioat/dma_v3.c

+15 −0
Original line number Diff line number Diff line
@@ -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);