linux-kernel - [PATCH 2/3] habanalabs/gaudi: fix DMA completions max outstanding to 15

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Date:   Wed, 16 Sep 2020 16:43:32 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     SW_Drivers@...ana.ai
Subject: [PATCH 2/3] 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 <oded.gabbay@...il.com>
---
 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