20402106a3
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
56 lines
1.9 KiB
Diff
56 lines
1.9 KiB
Diff
From dd06728c740cdeb3346a7b74d8a5924672ed6da1 Mon Sep 17 00:00:00 2001
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From: Martin Sperl <kernel@martin.sperl.org>
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Date: Wed, 16 Mar 2016 12:24:56 -0700
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Subject: [PATCH 394/423] dmaengine: bcm2835: remove unnecessary masking of dma
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channels
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The original patch contained 3 dma channels that were masked out.
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These - as far as research and discussions show - are a
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artefacts remaining from the downstream legacy dma-api.
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Right now down-stream still includes a legacy api used only
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in a single (downstream only) driver (bcm2708_fb) that requires
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2D DMA for speedup (DMA-channel 0).
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Formerly the sd-card support driver also was using this legacy
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api (DMA-channel 2), but since has been moved over to use
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dmaengine directly.
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The DMA-channel 3 is already masked out in the devicetree in
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the default property "brcm,dma-channel-mask = <0x7f35>;"
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So we can remove the whole masking of DMA channels.
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Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
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Reviewed-by: Eric Anholt <eric@anholt.net>
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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---
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drivers/dma/bcm2835-dma.c | 9 ---------
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1 file changed, 9 deletions(-)
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--- a/drivers/dma/bcm2835-dma.c
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+++ b/drivers/dma/bcm2835-dma.c
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@@ -123,9 +123,6 @@ struct bcm2835_desc {
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#define BCM2835_DMA_DATA_TYPE_S32 4
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#define BCM2835_DMA_DATA_TYPE_S128 16
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-#define BCM2835_DMA_BULK_MASK BIT(0)
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-#define BCM2835_DMA_FIQ_MASK (BIT(2) | BIT(3))
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-
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/* Valid only for channels 0 - 14, 15 has its own base address */
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#define BCM2835_DMA_CHAN(n) ((n) << 8) /* Base address */
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#define BCM2835_DMA_CHANIO(base, n) ((base) + BCM2835_DMA_CHAN(n))
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@@ -641,12 +638,6 @@ static int bcm2835_dma_probe(struct plat
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goto err_no_dma;
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}
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- /*
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- * Do not use the FIQ and BULK channels,
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- * because they are used by the GPU.
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- */
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- chans_available &= ~(BCM2835_DMA_FIQ_MASK | BCM2835_DMA_BULK_MASK);
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-
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for (i = 0; i < pdev->num_resources; i++) {
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irq = platform_get_irq(pdev, i);
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if (irq < 0)
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