From: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxx>
Reviewed-by: Eric Anholt <eric@xxxxxxxxxx>
---
drivers/dma/bcm2835-dma.c | 9 ---------
1 file changed, 9 deletions(-)
diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
index 2d72fe8..e4ca980 100644
--- 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 platform_device *pdev)
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)
--
2.1.4
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