linux-kernel - [PATCH] clk: imx: pll14xx: fix recalc

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Message-Id: <20221210203835.9714-1-kgroeneveld@lenbrook.com>
Date:   Sat, 10 Dec 2022 15:38:35 -0500
From:   Kevin Groeneveld <kgroeneveld@...brook.com>
To:     Abel Vesa <abelvesa@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Kevin Groeneveld <kgroeneveld@...brook.com>
Subject: [PATCH] clk: imx: pll14xx: fix recalc_rate for negative kdiv

kdiv is a signed 16 bit value in the DEV_CTL1 register. Commit
53990cf9d5b4 ("clk: imx: pll14xx: consolidate rate calculation") changed
the kdiv variable from a short int to just int. When the value read from
the DIV_CTL1 register is assigned directly to an int the sign of the value
is lost resulting in incorrect results when the value is negative. Adding
a s16 cast to the register value fixes the issue.

Fixes: 53990cf9d5b4 ("clk: imx: pll14xx: consolidate rate calculation")
Signed-off-by: Kevin Groeneveld <kgroeneveld@...brook.com>
---
 drivers/clk/imx/clk-pll14xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c
index 1d0f79e9c346..d12194d17b10 100644
--- a/drivers/clk/imx/clk-pll14xx.c
+++ b/drivers/clk/imx/clk-pll14xx.c
@@ -254,7 +254,7 @@ static unsigned long clk_pll14xx_recalc_rate(struct clk_hw *hw,
 
 	if (pll->type == PLL_1443X) {
 		pll_div_ctl1 = readl_relaxed(pll->base + DIV_CTL1);
-		kdiv = FIELD_GET(KDIV_MASK, pll_div_ctl1);
+		kdiv = (s16)FIELD_GET(KDIV_MASK, pll_div_ctl1);
 	} else {
 		kdiv = 0;
 	}
-- 
2.17.1