diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0868-bcm2835-dma-Add-NO_WAIT_RESP-flag.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0868-bcm2835-dma-Add-NO_WAIT_RESP-flag.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0868-bcm2835-dma-Add-NO_WAIT_RESP-flag.patch b/target/linux/bcm27xx/patches-5.4/950-0868-bcm2835-dma-Add-NO_WAIT_RESP-flag.patch new file mode 100644 index 0000000000..8fc7069e61 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0868-bcm2835-dma-Add-NO_WAIT_RESP-flag.patch @@ -0,0 +1,54 @@ +From 8c070947d0d9ef7f890eeff329d4deb1c393ef87 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.com> +Date: Wed, 1 Jul 2020 20:28:27 +0100 +Subject: [PATCH] bcm2835-dma: Add NO_WAIT_RESP flag + +Use bit 27 of the dreq value (the second cell of the DT DMA descriptor) +to request that the WAIT_RESP bit is not set. + +Signed-off-by: Phil Elwell <phil@raspberrypi.com> +--- + drivers/dma/bcm2835-dma.c | 11 ++++++++--- + 1 file changed, 8 insertions(+), 3 deletions(-) + +--- a/drivers/dma/bcm2835-dma.c ++++ b/drivers/dma/bcm2835-dma.c +@@ -167,6 +167,11 @@ struct bcm2835_desc { + #define BCM2835_DMA_WAIT(x) ((x & 31) << 21) /* add DMA-wait cycles */ + #define BCM2835_DMA_NO_WIDE_BURSTS BIT(26) /* no 2 beat write bursts */ + ++/* A fake bit to request that the driver doesn't set the WAIT_RESP bit. */ ++#define BCM2835_DMA_NO_WAIT_RESP BIT(27) ++#define WAIT_RESP(x) ((x & BCM2835_DMA_NO_WAIT_RESP) ? \ ++ 0 : BCM2835_DMA_WAIT_RESP) ++ + /* debug register bits */ + #define BCM2835_DMA_DEBUG_LAST_NOT_SET_ERR BIT(0) + #define BCM2835_DMA_DEBUG_FIFO_ERR BIT(1) +@@ -845,7 +850,7 @@ 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 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP; ++ u32 extra = BCM2835_DMA_INT_EN | WAIT_RESP(c->dreq); + size_t max_len = bcm2835_dma_max_frame_length(c); + size_t frames; + +@@ -875,7 +880,7 @@ static struct dma_async_tx_descriptor *b + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + struct bcm2835_desc *d; + dma_addr_t src = 0, dst = 0; +- u32 info = BCM2835_DMA_WAIT_RESP; ++ u32 info = WAIT_RESP(c->dreq); + u32 extra = BCM2835_DMA_INT_EN; + size_t frames; + +@@ -937,7 +942,7 @@ 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 = BCM2835_DMA_WAIT_RESP; ++ u32 info = WAIT_RESP(c->dreq); + u32 extra = 0; + size_t max_len = bcm2835_dma_max_frame_length(c); + size_t frames; |