linux-kernel - [PATCH] clk: imx: correct pfdv2 gate_bit/vld

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Date:   Fri, 26 Apr 2019 06:53:14 +0000
From:   Anson Huang <anson.huang@....com>
To:     "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        Aisheng Dong <aisheng.dong@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: [PATCH] clk: imx: correct pfdv2 gate_bit/vld_bit operations

The operations of pfdv2 gate_bit/valid_bit are incorrect,
they are defined as u8 for bit offset, but gate_bit is
actually assigned as mask which could be 32 bit long and
it causes overflow, and vld_bit is assigned as bit offset
based on incorrect gate_bit value, it causes incorrect
pfd clock gate status in clock tree, this patch fixes the
issue by assigning them as correct bit offset.

Fixes: 9fcb6be3b6c9 ("clk: imx: add pfdv2 support")
Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 drivers/clk/imx/clk-pfdv2.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/imx/clk-pfdv2.c b/drivers/clk/imx/clk-pfdv2.c
index 7e9134b..fb567dc 100644
--- a/drivers/clk/imx/clk-pfdv2.c
+++ b/drivers/clk/imx/clk-pfdv2.c
@@ -43,7 +43,7 @@ static int clk_pfdv2_wait(struct clk_pfdv2 *pfd)
 {
 	u32 val;
 
-	return readl_poll_timeout(pfd->reg, val, val & pfd->vld_bit,
+	return readl_poll_timeout(pfd->reg, val, val & (1 << pfd->vld_bit),
 				  0, LOCK_TIMEOUT_US);
 }
 
@@ -55,7 +55,7 @@ static int clk_pfdv2_enable(struct clk_hw *hw)
 
 	spin_lock_irqsave(&pfd_lock, flags);
 	val = readl_relaxed(pfd->reg);
-	val &= ~pfd->gate_bit;
+	val &= ~(1 << pfd->gate_bit);
 	writel_relaxed(val, pfd->reg);
 	spin_unlock_irqrestore(&pfd_lock, flags);
 
@@ -70,7 +70,7 @@ static void clk_pfdv2_disable(struct clk_hw *hw)
 
 	spin_lock_irqsave(&pfd_lock, flags);
 	val = readl_relaxed(pfd->reg);
-	val |= pfd->gate_bit;
+	val |= (1 << pfd->gate_bit);
 	writel_relaxed(val, pfd->reg);
 	spin_unlock_irqrestore(&pfd_lock, flags);
 }
@@ -123,7 +123,7 @@ static int clk_pfdv2_is_enabled(struct clk_hw *hw)
 {
 	struct clk_pfdv2 *pfd = to_clk_pfdv2(hw);
 
-	if (readl_relaxed(pfd->reg) & pfd->gate_bit)
+	if (readl_relaxed(pfd->reg) & (1 << pfd->gate_bit))
 		return 0;
 
 	return 1;
@@ -180,7 +180,7 @@ struct clk_hw *imx_clk_pfdv2(const char *name, const char *parent_name,
 		return ERR_PTR(-ENOMEM);
 
 	pfd->reg = reg;
-	pfd->gate_bit = 1 << ((idx + 1) * 8 - 1);
+	pfd->gate_bit = (idx + 1) * 8 - 1;
 	pfd->vld_bit = pfd->gate_bit - 1;
 	pfd->frac_off = idx * 8;
 
-- 
2.7.4