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habanalabs/gaudi: fix DMA completions max outstanding to 15

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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: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Oded Gabbay 2020-09-14 09:26:54 +03:00
parent dbf053c429
commit d1f3633599
1 changed files with 3 additions and 0 deletions
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3
drivers/misc/habanalabs/gaudi/gaudi.c
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@ -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;