From: Andy Green <andy.green@linaro.org>
Date: Mon, 29 Aug 2016 17:30:47 +0000 (-0700)
Subject: k3dma: Fix hisi burst clipping
X-Git-Tag: v4.9-rc1~102^2~8^2~7
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6c28a90fb30cd3fe504e7dafe0b60b733f240f8c;p=karo-tx-linux.git

k3dma: Fix hisi burst clipping

Max burst len is a 4-bit field, but at the moment it's clipped with
a 5-bit constant... reduce it to that which can be expressed

Cc: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Andy Green <andy@warmcat.com>
Acked-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Andy Green <andy.green@linaro.org>
[jstultz: Forward ported to mainline]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
---

diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c
index 39de8980128c..3d514692bdc6 100644
--- a/drivers/dma/k3dma.c
+++ b/drivers/dma/k3dma.c
@@ -551,7 +551,7 @@ static int k3_dma_config(struct dma_chan *chan,
 	c->ccfg |= (val << 12) | (val << 16);
 
 	if ((maxburst == 0) || (maxburst > 16))
-		val = 16;
+		val = 15;
 	else
 		val = maxburst - 1;
 	c->ccfg |= (val << 20) | (val << 24);