From: Oded Gabbay Date: Mon, 14 Sep 2020 06:26:54 +0000 (+0300) Subject: habanalabs/gaudi: fix DMA completions max outstanding to 15 X-Git-Tag: v5.10-rc1~124^2~120^2~2 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1f3633599a9178572f3b25f9f23cd9dc423a9fa;p=thirdparty%2Fkernel%2Flinux.git 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 --- diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c index 2c10e3f92c864..86650be5898f1 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;