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 2/4] dmaengine: stm32-dma: clean channel configuration when channel is freed
Date: Fri, 20 Nov 2020 15:33:18 +0100 [thread overview]
Message-ID: <20201120143320.30367-3-amelie.delaunay@st.com> (raw)
In-Reply-To: <20201120143320.30367-1-amelie.delaunay@st.com>
When dma_channel_release is called, it means that the channel won't be used
anymore with the configuration it had. To ensure a future client can safely
use the channel after it has been released, clean the configuration done
when channel was requested.
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 55a6bd381219..62501e5d9e9d 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -1220,6 +1220,8 @@ static void stm32_dma_free_chan_resources(struct dma_chan *c)
pm_runtime_put(dmadev->ddev.dev);
vchan_free_chan_resources(to_virt_chan(c));
+ stm32_dma_clear_reg(&chan->chan_reg);
+ chan->threshold = 0;
}
static void stm32_dma_desc_free(struct virt_dma_desc *vdesc)
--
2.17.1
next prev parent reply other threads:[~2020-11-20 14:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 14:33 [PATCH 0/4] Bunch of improvements for STM32 DMA controllers Amelie Delaunay
2020-11-20 14:33 ` [PATCH 1/4] dmaengine: stm32-dma: rework irq handler to manage error before xfer events Amelie Delaunay
2020-11-20 14:33 ` Amelie Delaunay [this message]
2020-11-20 14:33 ` [PATCH 3/4] dmaengine: stm32-dma: take address into account when computing max width Amelie Delaunay
2020-11-20 14:33 ` [PATCH 4/4] dmaengine: stm32-mdma: rework interrupt handler Amelie Delaunay
2020-12-11 15:43 ` [PATCH 0/4] Bunch of improvements for STM32 DMA controllers Vinod Koul
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