From d1f3633599a9178572f3b25f9f23cd9dc423a9fa Mon Sep 17 00:00:00 2001 From: Oded Gabbay Date: Mon, 14 Sep 2020 09:26:54 +0300 Subject: 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: Oded Gabbay --- drivers/misc/habanalabs/gaudi/gaudi.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/misc') 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; -- cgit v1.2.3