From: Amelie Delaunay <amelie.delaunay@st.com>
To: Vinod Koul <vkoul@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>
Cc: <dmaengine@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
Amelie Delaunay <amelie.delaunay@st.com>,
Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Subject: [PATCH 4/8] dmaengine: stm32-dma: enable descriptor_reuse
Date: Wed, 29 Jan 2020 16:36:24 +0100 [thread overview]
Message-ID: <20200129153628.29329-5-amelie.delaunay@st.com> (raw)
In-Reply-To: <20200129153628.29329-1-amelie.delaunay@st.com>
From: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Enable client to resubmit already processed descriptors
in order to save descriptor creation time.
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
---
drivers/dma/stm32-dma.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index c8bbe08b8e32..25f7281932bd 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -554,6 +554,7 @@ static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
sg_req = &chan->desc->sg_req[chan->next_sg];
reg = &sg_req->chan_reg;
+ reg->dma_scr &= ~STM32_DMA_SCR_EN;
stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr);
stm32_dma_write(dmadev, STM32_DMA_SPAR(chan->id), reg->dma_spar);
stm32_dma_write(dmadev, STM32_DMA_SM0AR(chan->id), reg->dma_sm0ar);
@@ -1343,6 +1344,7 @@ static int stm32_dma_probe(struct platform_device *pdev)
dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
dd->max_burst = STM32_DMA_MAX_BURST;
+ dd->descriptor_reuse = true;
dd->dev = &pdev->dev;
INIT_LIST_HEAD(&dd->channels);
--
2.17.1
next prev parent reply other threads:[~2020-01-29 15:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-29 15:36 [PATCH 0/8] STM32 DMA driver fixes and improvements Amelie Delaunay
2020-01-29 15:36 ` [PATCH 1/8] dmaengine: stm32-dma: add suspend/resume power management support Amelie Delaunay
2020-01-29 15:36 ` [PATCH 2/8] dmaengine: stm32-dma: use reset controller only at probe time Amelie Delaunay
2020-01-29 15:36 ` [PATCH 3/8] dmaengine: stm32-dma: driver defers probe for reset Amelie Delaunay
2020-01-29 15:36 ` Amelie Delaunay [this message]
2020-01-29 15:36 ` [PATCH 5/8] dmaengine: stm32-dma: use dma_set_max_seg_size to set the sg limit Amelie Delaunay
2020-01-29 15:36 ` [PATCH 6/8] dmaengine: stm32-dma: add copy_align constraint Amelie Delaunay
2020-01-29 15:36 ` [PATCH 7/8] dmaengine: stm32-dma: fix sleeping function called from invalid context Amelie Delaunay
2020-01-29 15:36 ` [PATCH 8/8] dmaengine: stm32-dma: use vchan_terminate_vdesc() in .terminate_all Amelie Delaunay
2020-02-25 5:45 ` [PATCH 0/8] STM32 DMA driver fixes and improvements Vinod Koul
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