linux-kernel - [PATCH V9 1/6] clk: imx6sl: Use BIT(x) to avoid shifting signed 32-bit value by 31 bits

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Message-Id: <1596072174-16358-2-git-send-email-Anson.Huang@nxp.com>
Date:   Thu, 30 Jul 2020 09:22:49 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     mturquette@...libre.com, sboyd@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        aisheng.dong@....com, arnd@...db.de, peng.fan@....com,
        abel.vesa@....com, fugang.duan@....com, daniel.baluta@....com,
        yuehaibing@...wei.com, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Linux-imx@....com
Subject: [PATCH V9 1/6] clk: imx6sl: Use BIT(x) to avoid shifting signed 32-bit value by 31 bits

Use readl_relaxed() instead of __raw_readl(), and use BIT(x)
instead of (1 << X) to fix below build warning reported by kernel
test robot:

drivers/clk/imx/clk-imx6sl.c:149:49: warning: Shifting signed 32-bit
value by 31 bits is undefined behaviour [shiftTooManyBitsSigned]
     while (!(__raw_readl(anatop_base + PLL_ARM) & BM_PLL_ARM_LOCK))

Signed-off-by: Anson Huang <Anson.Huang@....com>
Reported-by: kernel test robot <lkp@...el.com>
---
changes since V8:
	- explicitly include linux/bits.h.
---
 drivers/clk/imx/clk-imx6sl.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/imx/clk-imx6sl.c b/drivers/clk/imx/clk-imx6sl.c
index 0f647d1..2f93619 100644
--- a/drivers/clk/imx/clk-imx6sl.c
+++ b/drivers/clk/imx/clk-imx6sl.c
@@ -3,6 +3,7 @@
  * Copyright 2013-2014 Freescale Semiconductor, Inc.
  */
 
+#include <linux/bits.h>
 #include <linux/clk.h>
 #include <linux/clkdev.h>
 #include <linux/err.h>
@@ -14,19 +15,19 @@
 #include "clk.h"
 
 #define CCSR			0xc
-#define BM_CCSR_PLL1_SW_CLK_SEL	(1 << 2)
+#define BM_CCSR_PLL1_SW_CLK_SEL	BIT(2)
 #define CACRR			0x10
 #define CDHIPR			0x48
-#define BM_CDHIPR_ARM_PODF_BUSY	(1 << 16)
+#define BM_CDHIPR_ARM_PODF_BUSY	BIT(16)
 #define ARM_WAIT_DIV_396M	2
 #define ARM_WAIT_DIV_792M	4
 #define ARM_WAIT_DIV_996M	6
 
 #define PLL_ARM			0x0
-#define BM_PLL_ARM_DIV_SELECT	(0x7f << 0)
-#define BM_PLL_ARM_POWERDOWN	(1 << 12)
-#define BM_PLL_ARM_ENABLE	(1 << 13)
-#define BM_PLL_ARM_LOCK		(1 << 31)
+#define BM_PLL_ARM_DIV_SELECT	0x7f
+#define BM_PLL_ARM_POWERDOWN	BIT(12)
+#define BM_PLL_ARM_ENABLE	BIT(13)
+#define BM_PLL_ARM_LOCK		BIT(31)
 #define PLL_ARM_DIV_792M	66
 
 static const char *step_sels[]		= { "osc", "pll2_pfd2", };
@@ -145,7 +146,7 @@ static void imx6sl_enable_pll_arm(bool enable)
 		val |= BM_PLL_ARM_ENABLE;
 		val &= ~BM_PLL_ARM_POWERDOWN;
 		writel_relaxed(val, anatop_base + PLL_ARM);
-		while (!(__raw_readl(anatop_base + PLL_ARM) & BM_PLL_ARM_LOCK))
+		while (!(readl_relaxed(anatop_base + PLL_ARM) & BM_PLL_ARM_LOCK))
 			;
 	} else {
 		 writel_relaxed(saved_pll_arm, anatop_base + PLL_ARM);
-- 
2.7.4