Commit d1f36335 authored by Oded Gabbay's avatar Oded Gabbay
Browse files

habanalabs/gaudi: fix DMA completions max outstanding to 15 



This is a workaround for H/W bug H3-2116, where if there are more than 16
outstanding completions in the DMA transpose engine, there can be a
deadlock in the engine.

Signed-off-by: default avatarOded Gabbay <oded.gabbay@gmail.com>
parent dbf053c4

drivers/misc/habanalabs/gaudi/gaudi.c

+3 −0
Original line number Diff line number Diff line
@@ -1918,6 +1918,9 @@ static void gaudi_init_dma_core(struct hl_device *hdev, int dma_id) 
	WREG32(mmDMA0_CORE_RD_MAX_OUTSTAND + dma_offset, 0);

	WREG32(mmDMA0_CORE_RD_MAX_SIZE + dma_offset, 0);



	/* WA for H/W bug H3-2116 */

	WREG32(mmDMA0_CORE_LBW_MAX_OUTSTAND + dma_offset, 15);



	/* STOP_ON bit implies no completion to operation in case of RAZWI */

	if (hdev->stop_on_err)

		dma_err_cfg |= 1 << DMA0_CORE_ERR_CFG_STOP_ON_ERR_SHIFT;