diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0924-bcm2835-dma-Advertise-the-full-DMA-range.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0924-bcm2835-dma-Advertise-the-full-DMA-range.patch | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0924-bcm2835-dma-Advertise-the-full-DMA-range.patch b/target/linux/bcm27xx/patches-5.4/950-0924-bcm2835-dma-Advertise-the-full-DMA-range.patch new file mode 100644 index 0000000000..33c740ffef --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0924-bcm2835-dma-Advertise-the-full-DMA-range.patch @@ -0,0 +1,77 @@ +From bf7baee1935c4d485083c3b3c439631ae4ac3c0f Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.com> +Date: Wed, 22 Jul 2020 17:59:31 +0100 +Subject: [PATCH] bcm2835-dma: Advertise the full DMA range + +Unless the DMA mask is set wider than 32 bits, DMA mapping will use a +bounce buffer. + +Signed-off-by: Phil Elwell <phil@raspberrypi.com> +--- + drivers/dma/bcm2835-dma.c | 18 +++++++++++++++--- + 1 file changed, 15 insertions(+), 3 deletions(-) + +--- a/drivers/dma/bcm2835-dma.c ++++ b/drivers/dma/bcm2835-dma.c +@@ -41,6 +41,7 @@ + #define BCM2711_DMA_MEMCPY_CHAN 14 + + struct bcm2835_dma_cfg_data { ++ u64 dma_mask; + u32 chan_40bit_mask; + }; + +@@ -302,10 +303,12 @@ DEFINE_SPINLOCK(memcpy_lock); + + static const struct bcm2835_dma_cfg_data bcm2835_dma_cfg = { + .chan_40bit_mask = 0, ++ .dma_mask = DMA_BIT_MASK(32), + }; + + static const struct bcm2835_dma_cfg_data bcm2711_dma_cfg = { + .chan_40bit_mask = BIT(11) | BIT(12) | BIT(13) | BIT(14), ++ .dma_mask = DMA_BIT_MASK(36), + }; + + static inline size_t bcm2835_dma_max_frame_length(struct bcm2835_chan *c) +@@ -1185,6 +1188,8 @@ static struct dma_chan *bcm2835_dma_xlat + + static int bcm2835_dma_probe(struct platform_device *pdev) + { ++ const struct bcm2835_dma_cfg_data *cfg_data; ++ const struct of_device_id *of_id; + struct bcm2835_dmadev *od; + struct resource *res; + void __iomem *base; +@@ -1194,13 +1199,20 @@ static int bcm2835_dma_probe(struct plat + int irq_flags; + uint32_t chans_available; + char chan_name[BCM2835_DMA_CHAN_NAME_SIZE]; +- const struct of_device_id *of_id; + int chan_count, chan_start, chan_end; + ++ of_id = of_match_node(bcm2835_dma_of_match, pdev->dev.of_node); ++ if (!of_id) { ++ dev_err(&pdev->dev, "Failed to match compatible string\n"); ++ return -EINVAL; ++ } ++ ++ cfg_data = of_id->data; ++ + if (!pdev->dev.dma_mask) + pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; + +- rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); ++ rc = dma_set_mask_and_coherent(&pdev->dev, cfg_data->dma_mask); + if (rc) { + dev_err(&pdev->dev, "Unable to set DMA mask\n"); + return rc; +@@ -1266,7 +1278,7 @@ static int bcm2835_dma_probe(struct plat + return -EINVAL; + } + +- od->cfg_data = of_id->data; ++ od->cfg_data = cfg_data; + + /* Request DMA channel mask from device tree */ + if (of_property_read_u32(pdev->dev.of_node, |