linux-kernel - Re: [PATCH v6 2/3] clk: at91: pmc: Save SCSR during suspend

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Date:   Tue, 19 Dec 2017 23:25:26 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Romain Izard <romain.izard.pro@...il.com>
Cc:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 2/3] clk: at91: pmc: Save SCSR during suspend

On 11/12/2017 at 17:55:34 +0100, Romain Izard wrote:
> The contents of the System Clock Status Register (SCSR) needs to be
> restored into the System Clock Enable Register (SCER).
> 
> As the bootloader will restore some clocks by itself, the issue can be
> missed as only the USB controller, the LCD controller, the Image Sensor
> controller and the programmable clocks will be impacted.
> 
> Fix the obvious typo in the suspend/resume code, as the IMR register
> does not need to be saved twice.
> 
> Signed-off-by: Romain Izard <romain.izard.pro@...il.com>
> Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

> ---
>  drivers/clk/at91/pmc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
> index 5c2b26de303e..07dc2861ad3f 100644
> --- a/drivers/clk/at91/pmc.c
> +++ b/drivers/clk/at91/pmc.c
> @@ -86,7 +86,7 @@ static int pmc_suspend(void)
>  {
>  	int i;
>  
> -	regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.scsr);
> +	regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr);
>  	regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0);
>  	regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr);
>  	regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor);
> @@ -129,7 +129,7 @@ static void pmc_resume(void)
>  	if (pmc_cache.pllar != tmp)
>  		pr_warn("PLLAR was not configured properly by the firmware\n");
>  
> -	regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.scsr);
> +	regmap_write(pmcreg, AT91_PMC_SCER, pmc_cache.scsr);
>  	regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0);
>  	regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr);
>  	regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor);
> -- 
> 2.14.1
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com