openwrtv4/target/linux/brcm2708/patches-4.4/0021-dmaengine-bcm2835-set-residue_granularity-field.patch
John Crispin cd2114e19c brcm2708: update linux 4.4 patches to latest version
As usual these patches were extracted from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 48966
2016-03-08 18:11:49 +00:00

29 lines
1.1 KiB
Diff

From 9c6955f3fbfbb46242c63b4640886b9a0d87910a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Sat, 3 Oct 2015 15:58:59 +0200
Subject: [PATCH 021/170] dmaengine: bcm2835: set residue_granularity field
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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bcm2835-dma supports residue reporting at burst level but didn't report
this via the residue_granularity field.
Without this field set properly we get playback issues with I2S cards.
[by HiassofT, taken from bcm2708-dmaengine]
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
drivers/dma/bcm2835-dma.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -802,6 +802,7 @@ static int bcm2835_dma_probe(struct plat
od->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
od->ddev.dev = &pdev->dev;
INIT_LIST_HEAD(&od->ddev.channels);
spin_lock_init(&od->lock);