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 <[email protected]> --- drivers/misc/habanalabs/gaudi/gaudi.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c index 2c10e3f92c86..86650be5898f 100644 --- a/drivers/misc/habanalabs/gaudi/gaudi.c +++ b/drivers/misc/habanalabs/gaudi/gaudi.c @@ -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; -- 2.17.1
