diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0428-bcm2835-dma-Add-bcm2835-dma-Add-DMA_WIDE_SOURCE-and-.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0428-bcm2835-dma-Add-bcm2835-dma-Add-DMA_WIDE_SOURCE-and-.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0428-bcm2835-dma-Add-bcm2835-dma-Add-DMA_WIDE_SOURCE-and-.patch b/target/linux/bcm27xx/patches-5.10/950-0428-bcm2835-dma-Add-bcm2835-dma-Add-DMA_WIDE_SOURCE-and-.patch new file mode 100644 index 0000000000..c7ea30c239 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0428-bcm2835-dma-Add-bcm2835-dma-Add-DMA_WIDE_SOURCE-and-.patch @@ -0,0 +1,64 @@ +From 7ab9c31d27699755870da3bae07b4a0f167b4284 Mon Sep 17 00:00:00 2001 +From: Dom Cobley <popcornmix@gmail.com> +Date: Wed, 30 Dec 2020 14:51:29 +0000 +Subject: [PATCH] bcm2835-dma: Add bcm2835-dma: Add DMA_WIDE_SOURCE and + DMA_WIDE_DEST flags + +Use (reserved) bits 24 and 25 of the dreq value +(the second cell of the DT DMA descriptor) to request +that wide source reads or wide dest writes are required + +Signed-off-by: Dom Cobley <popcornmix@gmail.com> +--- + drivers/dma/bcm2835-dma.c | 19 ++++++++++++++++--- + 1 file changed, 16 insertions(+), 3 deletions(-) + +--- a/drivers/dma/bcm2835-dma.c ++++ b/drivers/dma/bcm2835-dma.c +@@ -171,6 +171,17 @@ struct bcm2835_desc { + #define WAIT_RESP(x) ((x & BCM2835_DMA_NO_WAIT_RESP) ? \ + 0 : BCM2835_DMA_WAIT_RESP) + ++/* A fake bit to request that the driver requires wide reads */ ++#define BCM2835_DMA_WIDE_SOURCE BIT(24) ++#define WIDE_SOURCE(x) ((x & BCM2835_DMA_WIDE_SOURCE) ? \ ++ BCM2835_DMA_S_WIDTH : 0) ++ ++/* A fake bit to request that the driver requires wide writes */ ++#define BCM2835_DMA_WIDE_DEST BIT(25) ++#define WIDE_DEST(x) ((x & BCM2835_DMA_WIDE_DEST) ? \ ++ BCM2835_DMA_D_WIDTH : 0) ++ ++ + /* debug register bits */ + #define BCM2835_DMA_DEBUG_LAST_NOT_SET_ERR BIT(0) + #define BCM2835_DMA_DEBUG_FIFO_ERR BIT(1) +@@ -850,7 +861,8 @@ static struct dma_async_tx_descriptor *b + { + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + struct bcm2835_desc *d; +- u32 info = BCM2835_DMA_D_INC | BCM2835_DMA_S_INC; ++ u32 info = BCM2835_DMA_D_INC | BCM2835_DMA_S_INC | ++ WIDE_SOURCE(c->dreq) | WIDE_DEST(c->dreq); + u32 extra = BCM2835_DMA_INT_EN | WAIT_RESP(c->dreq); + size_t max_len = bcm2835_dma_max_frame_length(c); + size_t frames; +@@ -881,7 +893,8 @@ static struct dma_async_tx_descriptor *b + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + struct bcm2835_desc *d; + dma_addr_t src = 0, dst = 0; +- u32 info = WAIT_RESP(c->dreq); ++ u32 info = WAIT_RESP(c->dreq) | ++ WIDE_SOURCE(c->dreq) | WIDE_DEST(c->dreq); + u32 extra = BCM2835_DMA_INT_EN; + size_t frames; + +@@ -943,7 +956,7 @@ static struct dma_async_tx_descriptor *b + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + struct bcm2835_desc *d; + dma_addr_t src, dst; +- u32 info = WAIT_RESP(c->dreq); ++ u32 info = WAIT_RESP(c->dreq) | WIDE_SOURCE(c->dreq) | WIDE_DEST(c->dreq); + u32 extra = 0; + size_t max_len = bcm2835_dma_max_frame_length(c); + size_t frames; |