diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0393-dmaengine-bcm2835-remove-unnecessary-masking-of-dma-.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0393-dmaengine-bcm2835-remove-unnecessary-masking-of-dma-.patch | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0393-dmaengine-bcm2835-remove-unnecessary-masking-of-dma-.patch b/target/linux/brcm2708/patches-4.4/0393-dmaengine-bcm2835-remove-unnecessary-masking-of-dma-.patch new file mode 100644 index 0000000000..5254a2a62e --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0393-dmaengine-bcm2835-remove-unnecessary-masking-of-dma-.patch @@ -0,0 +1,56 @@ +From 0f65c306a55ab6a8e8148b6d9c966a1d214ae3c9 Mon Sep 17 00:00:00 2001 +From: Martin Sperl <kernel@martin.sperl.org> +Date: Wed, 16 Mar 2016 12:24:56 -0700 +Subject: [PATCH] dmaengine: bcm2835: remove unnecessary masking of dma + channels + +The original patch contained 3 dma channels that were masked out. + +These - as far as research and discussions show - are a +artefacts remaining from the downstream legacy dma-api. + +Right now down-stream still includes a legacy api used only +in a single (downstream only) driver (bcm2708_fb) that requires +2D DMA for speedup (DMA-channel 0). +Formerly the sd-card support driver also was using this legacy +api (DMA-channel 2), but since has been moved over to use +dmaengine directly. + +The DMA-channel 3 is already masked out in the devicetree in +the default property "brcm,dma-channel-mask = <0x7f35>;" + +So we can remove the whole masking of DMA channels. + +Signed-off-by: Martin Sperl <kernel@martin.sperl.org> +Reviewed-by: Eric Anholt <eric@anholt.net> +Signed-off-by: Eric Anholt <eric@anholt.net> +Signed-off-by: Vinod Koul <vinod.koul@intel.com> +--- + drivers/dma/bcm2835-dma.c | 9 --------- + 1 file changed, 9 deletions(-) + +--- a/drivers/dma/bcm2835-dma.c ++++ b/drivers/dma/bcm2835-dma.c +@@ -123,9 +123,6 @@ struct bcm2835_desc { + #define BCM2835_DMA_DATA_TYPE_S32 4 + #define BCM2835_DMA_DATA_TYPE_S128 16 + +-#define BCM2835_DMA_BULK_MASK BIT(0) +-#define BCM2835_DMA_FIQ_MASK (BIT(2) | BIT(3)) +- + /* Valid only for channels 0 - 14, 15 has its own base address */ + #define BCM2835_DMA_CHAN(n) ((n) << 8) /* Base address */ + #define BCM2835_DMA_CHANIO(base, n) ((base) + BCM2835_DMA_CHAN(n)) +@@ -641,12 +638,6 @@ static int bcm2835_dma_probe(struct plat + goto err_no_dma; + } + +- /* +- * Do not use the FIQ and BULK channels, +- * because they are used by the GPU. +- */ +- chans_available &= ~(BCM2835_DMA_FIQ_MASK | BCM2835_DMA_BULK_MASK); +- + for (i = 0; i < pdev->num_resources; i++) { + irq = platform_get_irq(pdev, i); + if (irq < 0) |