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dmaengine: stm32-dma3: defer channel registration to specify channel name

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On STM32 DMA3, channels can be reserved, so they are non available for
Linux. This non-availability creates a mismatch between dma_chan id and
DMA3 channel id.

Use dma_async_device_channel_register() to register the channels
after controller registration and change the default channel name, so that
it can match the name in the Reference Manual and ease requesting a channel
thanks to its name.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20240531150712.2503554-12-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Amelie Delaunay 2024-05-31 17:07:11 +02:00 committed by Vinod Koul
parent 10b8e0fd3f
commit 49b1c21ff8
1 changed files with 14 additions and 5 deletions
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19
drivers/dma/stm32/stm32-dma3.c
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@ -1732,9 +1732,6 @@ static int stm32_dma3_probe(struct platform_device *pdev)
chan->fifo_size = get_chan_hwcfg(i, G_FIFO_SIZE(i), hwcfgr);
/* If chan->fifo_size > 0 then half of the fifo size, else no burst when no FIFO */
chan->max_burst = (chan->fifo_size) ? (1 << (chan->fifo_size + 1)) / 2 : 0;
chan->vchan.desc_free = stm32_dma3_chan_vdesc_free;
vchan_init(&chan->vchan, dma_dev);
}
ret = dmaenginem_async_device_register(dma_dev);
@ -1742,14 +1739,26 @@ static int stm32_dma3_probe(struct platform_device *pdev)
goto err_clk_disable;
for (i = 0; i < ddata->dma_channels; i++) {
char name[12];
if (chan_reserved & BIT(i))
continue;
chan = &ddata->chans[i];
snprintf(name, sizeof(name), "dma%dchan%d", ddata->dma_dev.dev_id, chan->id);
chan->vchan.desc_free = stm32_dma3_chan_vdesc_free;
vchan_init(&chan->vchan, dma_dev);
ret = dma_async_device_channel_register(&ddata->dma_dev, &chan->vchan.chan, name);
if (ret) {
dev_err_probe(&pdev->dev, ret, "Failed to register channel %s\n", name);
goto err_clk_disable;
}
ret = platform_get_irq(pdev, i);
if (ret < 0)
goto err_clk_disable;
chan = &ddata->chans[i];
chan->irq = ret;
ret = devm_request_irq(&pdev->dev, chan->irq, stm32_dma3_chan_irq, 0,