linux-kernel - [PATCH v7 8/9] dmaengine: pl330: add max burst for dmaengine

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Message-Id: <1453460812-8498-9-git-send-email-wxt@rock-chips.com>
Date:	Fri, 22 Jan 2016 19:06:51 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>, Vinod Koul <vinod.koul@...el.com>
Cc:	Sonny Rao <sonnyrao@...omium.org>, shawn.lin@...k-chips.com,
	dianders@...omium.org, linux-rockchip@...ts.infradead.org,
	Caesar Wang <wxt@...k-chips.com>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v7 8/9] dmaengine: pl330: add max burst for dmaengine

From: Shawn Lin <shawn.lin@...k-chips.com>

This patch add max burst capability for dmaengine and
limit burst capability to one for PL330_QUIRK_BROKEN_NO_FLUSHP

Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
Signed-off-by: Caesar Wang <wxt@...k-chips.com>

---

Changes in v7:
- fix the subject.

Changes in v6:
- remove expose quirks and add max_burst for dmaengine

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

 drivers/dma/pl330.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 008408d..1b0453b 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -33,6 +33,7 @@
 #define PL330_MAX_CHAN		8
 #define PL330_MAX_IRQS		32
 #define PL330_MAX_PERI		32
+#define PL330_MAX_BURST         16
 
 #define PL330_QUIRK_BROKEN_NO_FLUSHP BIT(0)
 
@@ -2938,6 +2939,8 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 	pd->dst_addr_widths = PL330_DMA_BUSWIDTHS;
 	pd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 	pd->residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
+	pd->max_burst = ((pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP) ?
+			 1 : PL330_MAX_BURST);
 
 	ret = dma_async_device_register(pd);
 	if (ret) {
-- 
1.9.1