linux-kernel - [PATCH 1/7 v5] k3dma: Fix hisi burst clipping

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Message-Id: <1472491853-15644-2-git-send-email-john.stultz@linaro.org>
Date:   Mon, 29 Aug 2016 10:30:47 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     Andy Green <andy.green@...aro.org>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Krzysztof Kozlowski <k.kozlowski@...sung.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Mark Brown <broonie@...nel.org>, Andy Green <andy@...mcat.com>,
        John Stultz <john.stultz@...aro.org>
Subject: [PATCH 1/7 v5] k3dma: Fix hisi burst clipping

From: Andy Green <andy.green@...aro.org>

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@...aro.org>
Cc: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc: Vinod Koul <vinod.koul@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Andy Green <andy@...mcat.com>
Acked-by: Zhangfei Gao <zhangfei.gao@...aro.org>
Signed-off-by: Andy Green <andy.green@...aro.org>
[jstultz: Forward ported to mainline]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/dma/k3dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c
index 39de898..3d51469 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);
-- 
1.9.1