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

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Message-ID: <21e4cb835f678faa911ef97d28931246.sboyd@kernel.org>
Date:   Fri, 10 Feb 2023 15:24:54 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Abel Vesa <abelvesa@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        Kevin Groeneveld <kgroeneveld@...brook.com>,
        Michael Turquette <mturquette@...libre.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Kevin Groeneveld <kgroeneveld@...brook.com>
Subject: Re: [PATCH] clk: imx: pll14xx: fix recalc_rate for negative kdiv

Quoting Kevin Groeneveld (2022-12-10 12:38:35)
> 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

Can the field be negative?

> 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>