linux-kernel - Re: [PATCH v2] clk: samsung: fix cpu clock's flags checking

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Date:	Tue, 15 Sep 2015 14:28:39 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Michael Turquette <mturquette@...libre.com>
Cc:	Thomas Abraham <thomas.ab@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Kevin Hilman <khilman@...aro.org>,
	Javier Martinez Canillas <javier@...hile0.org>,
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v2] clk: samsung: fix cpu clock's flags checking


[ + Stephen on cc: ]

On Friday, August 28, 2015 01:49:35 PM Bartlomiej Zolnierkiewicz wrote:
> CLK_CPU_HAS_DIV1 and CLK_CPU_NEEDS_DEBUG_ALT_DIV masks were
> incorrectly used as a bit numbers.  Fix it.
> 
> Tested on Exynos4210 based Origen board and on Exynos5250 based
> Arndale board.
> 
> Cc: Tomasz Figa <tomasz.figa@...il.com>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Thomas Abraham <thomas.ab@...sung.com>
> Fixes: ddeac8d96 ("clk: samsung: add infrastructure to register cpu clocks")
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Reviewed-by: Javier Martinez Canillas <javier@...hile0.org>
> Acked-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
> v2:
> - added Reviewed-by, Acked-by and Fixes tags (no code changes)
> 
> Michael, please apply.  Thank you.

Gentle ping.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

>  drivers/clk/samsung/clk-cpu.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
> index 7c1e1f5..2fe37f7 100644
> --- a/drivers/clk/samsung/clk-cpu.c
> +++ b/drivers/clk/samsung/clk-cpu.c
> @@ -164,7 +164,7 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
>  	 * the values for DIV_COPY and DIV_HPM dividers need not be set.
>  	 */
>  	div0 = cfg_data->div0;
> -	if (test_bit(CLK_CPU_HAS_DIV1, &cpuclk->flags)) {
> +	if (cpuclk->flags & CLK_CPU_HAS_DIV1) {
>  		div1 = cfg_data->div1;
>  		if (readl(base + E4210_SRC_CPU) & E4210_MUX_HPM_MASK)
>  			div1 = readl(base + E4210_DIV_CPU1) &
> @@ -185,7 +185,7 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
>  		alt_div = DIV_ROUND_UP(alt_prate, tmp_rate) - 1;
>  		WARN_ON(alt_div >= MAX_DIV);
>  
> -		if (test_bit(CLK_CPU_NEEDS_DEBUG_ALT_DIV, &cpuclk->flags)) {
> +		if (cpuclk->flags & CLK_CPU_NEEDS_DEBUG_ALT_DIV) {
>  			/*
>  			 * In Exynos4210, ATB clock parent is also mout_core. So
>  			 * ATB clock also needs to be mantained at safe speed.
> @@ -206,7 +206,7 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
>  	writel(div0, base + E4210_DIV_CPU0);
>  	wait_until_divider_stable(base + E4210_DIV_STAT_CPU0, DIV_MASK_ALL);
>  
> -	if (test_bit(CLK_CPU_HAS_DIV1, &cpuclk->flags)) {
> +	if (cpuclk->flags & CLK_CPU_HAS_DIV1) {
>  		writel(div1, base + E4210_DIV_CPU1);
>  		wait_until_divider_stable(base + E4210_DIV_STAT_CPU1,
>  				DIV_MASK_ALL);
> @@ -225,7 +225,7 @@ static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
>  	unsigned long mux_reg;
>  
>  	/* find out the divider values to use for clock data */
> -	if (test_bit(CLK_CPU_NEEDS_DEBUG_ALT_DIV, &cpuclk->flags)) {
> +	if (cpuclk->flags & CLK_CPU_NEEDS_DEBUG_ALT_DIV) {
>  		while ((cfg_data->prate * 1000) != ndata->new_rate) {
>  			if (cfg_data->prate == 0)
>  				return -EINVAL;
> @@ -240,7 +240,7 @@ static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
>  	writel(mux_reg & ~(1 << 16), base + E4210_SRC_CPU);
>  	wait_until_mux_stable(base + E4210_STAT_CPU, 16, 1);
>  
> -	if (test_bit(CLK_CPU_NEEDS_DEBUG_ALT_DIV, &cpuclk->flags)) {
> +	if (cpuclk->flags & CLK_CPU_NEEDS_DEBUG_ALT_DIV) {
>  		div |= (cfg_data->div0 & E4210_DIV0_ATB_MASK);
>  		div_mask |= E4210_DIV0_ATB_MASK;
>  	}

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