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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.patch77
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,