From: Amelie Delaunay <amelie.delaunay@foss.st.com>
To: Jonathan Corbet <corbet@lwn.net>, Vinod Koul <vkoul@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: <linux-doc@vger.kernel.org>, <dmaengine@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, Marek Vasut <marex@denx.de>,
Amelie Delaunay <amelie.delaunay@foss.st.com>
Subject: [PATCH v3 4/6] dmaengine: stm32-dmamux: set dmamux channel id in dma features bitfield
Date: Tue, 19 Jul 2022 17:31:20 +0200 [thread overview]
Message-ID: <20220719153122.620730-5-amelie.delaunay@foss.st.com> (raw)
In-Reply-To: <20220719153122.620730-1-amelie.delaunay@foss.st.com>
STM32 DMAMUX is used with STM32 DMA1 and DMA2:
- DMAMUX channels 0 to 7 are connected to DMA1 channels 0 to 7
- DMAMUX channels 8 to 15 are connected to DMA2 channels 0 to 7
STM32 MDMA can be triggered by DMA1 and DMA2 channels transfer complete,
and the "request line number" is the DMAMUX channel id (e.g. DMA2 channel 0
triggers MDMA with request line 8).
To well configure MDMA, set DMAMUX channel id in DMA features bitfield,
so that DMA can update struct dma_slave_config peripheral_config properly.
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
---
No changes in v3.
No changes in v2.
---
drivers/dma/stm32-dmamux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c
index eee0c5aa5fb5..b431f9da9206 100644
--- a/drivers/dma/stm32-dmamux.c
+++ b/drivers/dma/stm32-dmamux.c
@@ -147,7 +147,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec,
mux->request = dma_spec->args[0];
/* craft DMA spec */
- dma_spec->args[3] = dma_spec->args[2];
+ dma_spec->args[3] = dma_spec->args[2] | mux->chan_id << 16;
dma_spec->args[2] = dma_spec->args[1];
dma_spec->args[1] = 0;
dma_spec->args[0] = mux->chan_id - min;
--
2.25.1
next prev parent reply other threads:[~2022-07-19 15:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 15:31 [PATCH v3 0/6] STM32 DMA-MDMA chaining feature Amelie Delaunay
2022-07-19 15:31 ` [PATCH v3 1/6] dmaengine: stm32-dma: introduce 3 helpers to address channel flags Amelie Delaunay
2022-07-19 15:31 ` [PATCH v3 2/6] dmaengine: stm32-dma: use bitfield helpers Amelie Delaunay
2022-07-19 15:31 ` [PATCH v3 3/6] docs: arm: stm32: introduce STM32 DMA-MDMA chaining feature Amelie Delaunay
2022-07-19 15:31 ` Amelie Delaunay [this message]
2022-07-19 15:49 ` [PATCH v3 0/6] " Amelie Delaunay
2022-07-19 15:47 Amelie Delaunay
2022-07-19 15:47 ` [PATCH v3 4/6] dmaengine: stm32-dmamux: set dmamux channel id in dma features bitfield Amelie Delaunay
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