summaryrefslogtreecommitdiff
path: root/target/linux/sunxi/patches-3.12/100-2-fix-off-by-one-masks.patch
blob: 4dba06437580be3f3ddfa1b84ebd2ebcb8135139 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
From 04609953e11377c0705b0aba5c25ebdcbb9e4aa7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20L=C3=B3pez?= <emilio@elopez.com.ar>
Date: Thu, 5 Sep 2013 19:47:20 -0300
Subject: [PATCH] clk: sunxi: factors: fix off-by-one masks
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The previous code would generate one bit too long masks, and was
needlessly complicated. This patch replaces it by simpler code that can
generate the masks correctly.

Signed-off-by: Emilio López <emilio@elopez.com.ar>
---
 drivers/clk/sunxi/clk-factors.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c
index 88523f9..5687ac9 100644
--- a/drivers/clk/sunxi/clk-factors.c
+++ b/drivers/clk/sunxi/clk-factors.c
@@ -40,7 +40,7 @@ struct clk_factors {
 
 #define to_clk_factors(_hw) container_of(_hw, struct clk_factors, hw)
 
-#define SETMASK(len, pos)		(((-1U) >> (31-len))  << (pos))
+#define SETMASK(len, pos)		(((1U << (len)) - 1) << (pos))
 #define CLRMASK(len, pos)		(~(SETMASK(len, pos)))
 #define FACTOR_GET(bit, len, reg)	(((reg) & SETMASK(len, bit)) >> (bit))
 
-- 
1.8.5.1