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spi: rockchip-sfc: Using normal memory for dma

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Nornal memory CPU copy with cache invalidate is more efficient
than uncache memory copy.

Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Link: https://patch.msgid.link/20241219010557.333327-1-jon.lin@rock-chips.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jon Lin 2024-12-19 09:05:57 +08:00 committed by Mark Brown
parent f663898d04
commit b69386fcbc
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 25 additions and 22 deletions
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47
drivers/spi/spi-rockchip-sfc.c
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@ -156,10 +156,9 @@
#define SFC_MAX_CHIPSELECT_NUM 2
/* The SFC can transfer max 16KB - 1 at one time
* we set it to 15.5KB here for alignment.
*/
#define SFC_MAX_IOSIZE_VER3 (512 * 31)
/* Although up to 4GB, 64KB is enough with less mem reserved */
#define SFC_MAX_IOSIZE_VER4 (0x10000U)
/* DMA is only enabled for large data transmission */
#define SFC_DMA_TRANS_THRETHOLD (0x40)
@ -456,8 +455,10 @@ static int rockchip_sfc_xfer_data_dma(struct rockchip_sfc *sfc,
dev_dbg(sfc->dev, "sfc xfer_dma len=%x\n", len);
if (op->data.dir == SPI_MEM_DATA_OUT)
if (op->data.dir == SPI_MEM_DATA_OUT) {
memcpy(sfc->buffer, op->data.buf.out, len);
dma_sync_single_for_device(sfc->dev, sfc->dma_buffer, len, DMA_TO_DEVICE);
}
ret = rockchip_sfc_fifo_transfer_dma(sfc, sfc->dma_buffer, len);
if (!wait_for_completion_timeout(&sfc->cp, msecs_to_jiffies(2000))) {
@ -465,8 +466,11 @@ static int rockchip_sfc_xfer_data_dma(struct rockchip_sfc *sfc,
ret = -ETIMEDOUT;
}
rockchip_sfc_irq_mask(sfc, SFC_IMR_DMA);
if (op->data.dir == SPI_MEM_DATA_IN)
if (op->data.dir == SPI_MEM_DATA_IN) {
dma_sync_single_for_cpu(sfc->dev, sfc->dma_buffer, len, DMA_FROM_DEVICE);
memcpy(op->data.buf.in, sfc->buffer, len);
}
return ret;
}
@ -631,19 +635,6 @@ static int rockchip_sfc_probe(struct platform_device *pdev)
sfc->use_dma = !of_property_read_bool(sfc->dev->of_node, "rockchip,sfc-no-dma");
if (sfc->use_dma) {
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret) {
dev_warn(dev, "Unable to set dma mask\n");
return ret;
}
sfc->buffer = dmam_alloc_coherent(dev, SFC_MAX_IOSIZE_VER3,
&sfc->dma_buffer, GFP_KERNEL);
if (!sfc->buffer)
return -ENOMEM;
}
ret = clk_prepare_enable(sfc->hclk);
if (ret) {
dev_err(&pdev->dev, "Failed to enable ahb clk\n");
@ -674,8 +665,8 @@ static int rockchip_sfc_probe(struct platform_device *pdev)
if (ret)
goto err_irq;
sfc->max_iosize = rockchip_sfc_get_max_iosize(sfc);
sfc->version = rockchip_sfc_get_version(sfc);
sfc->max_iosize = rockchip_sfc_get_max_iosize(sfc);
pm_runtime_set_autosuspend_delay(dev, ROCKCHIP_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(dev);
@ -683,16 +674,27 @@ static int rockchip_sfc_probe(struct platform_device *pdev)
pm_runtime_enable(dev);
pm_runtime_get_noresume(dev);
if (sfc->use_dma) {
sfc->buffer = (u8 *)__get_free_pages(GFP_KERNEL | GFP_DMA32,
get_order(sfc->max_iosize));
if (!sfc->buffer) {
ret = -ENOMEM;
goto err_dma;
}
sfc->dma_buffer = virt_to_phys(sfc->buffer);
}
ret = devm_spi_register_controller(dev, host);
if (ret)
goto err_pm_runtime_free;
goto err_register;
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return 0;
err_pm_runtime_free:
err_register:
free_pages((unsigned long)sfc->buffer, get_order(sfc->max_iosize));
err_dma:
pm_runtime_get_sync(dev);
pm_runtime_put_noidle(dev);
pm_runtime_disable(dev);
@ -712,6 +714,7 @@ static void rockchip_sfc_remove(struct platform_device *pdev)
struct rockchip_sfc *sfc = platform_get_drvdata(pdev);
spi_unregister_controller(host);
free_pages((unsigned long)sfc->buffer, get_order(sfc->max_iosize));
clk_disable_unprepare(sfc->clk);
clk_disable_unprepare(sfc->hclk);