linux-kernel - [PATCH] drivers: soc: sunxi: Fix mask generation for SRAM mapping

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Message-Id: <1453902673-10734-1-git-send-email-jenskuske@gmail.com>
Date:	Wed, 27 Jan 2016 14:51:13 +0100
From:	Jens Kuske <jenskuske@...il.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-sunxi@...glegroups.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers: soc: sunxi: Fix mask generation for SRAM mapping

GENMASK is inclusive on both ends, therefor one has to be
subtracted from the width.
Also fixes the mask for debug output.

Signed-off-by: Jens Kuske <jenskuske@...il.com>
---
 drivers/soc/sunxi/sunxi_sram.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/sunxi/sunxi_sram.c b/drivers/soc/sunxi/sunxi_sram.c
index bc52670..99e354c 100644
--- a/drivers/soc/sunxi/sunxi_sram.c
+++ b/drivers/soc/sunxi/sunxi_sram.c
@@ -117,7 +117,7 @@ static int sunxi_sram_show(struct seq_file *s, void *data)
 
 			val = readl(base + sram_data->reg);
 			val >>= sram_data->offset;
-			val &= sram_data->width;
+			val &= GENMASK(sram_data->width - 1, 0);
 
 			for (func = sram_data->func; func->func; func++) {
 				seq_printf(s, "\t\t%s%c\n", func->func,
@@ -208,7 +208,8 @@ int sunxi_sram_claim(struct device *dev)
 		return -EBUSY;
 	}
 
-	mask = GENMASK(sram_data->offset + sram_data->width, sram_data->offset);
+	mask = GENMASK(sram_data->offset + sram_data->width - 1,
+		       sram_data->offset);
 	val = readl(base + sram_data->reg);
 	val &= ~mask;
 	writel(val | ((device << sram_data->offset) & mask),
-- 
2.7.0