linux-kernel - Re: [PATCH 1/4] power: reset: at91-poweroff: use one poweroff function for at91-poweroff

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Date:   Wed, 5 Dec 2018 23:37:05 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Claudiu.Beznea@...rochip.com
Cc:     Nicolas.Ferre@...rochip.com, alexandre.belloni@...tlin.com,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] power: reset: at91-poweroff: use one poweroff
 function for at91-poweroff

Hi,

On Mon, Nov 05, 2018 at 11:14:23AM +0000, Claudiu.Beznea@...rochip.com wrote:
> Use only one poweroff function and adapt it to work for both scenarios
> (with LPDDR or not). The assignement of pm_power_off was moved at the
> end of probe after all initializations are OK. This patch adapt the idea
> from commit 4e018c1e9b05 ("power: reset: at91-poweroff: use only one
> poweroff function").
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

Thanks, queued.

-- Sebastian

>  drivers/power/reset/at91-poweroff.c | 49 ++++++++++++++++++++-----------------
>  1 file changed, 27 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c
> index fb2fc8f741a1..82533f4c72fc 100644
> --- a/drivers/power/reset/at91-poweroff.c
> +++ b/drivers/power/reset/at91-poweroff.c
> @@ -76,11 +76,6 @@ static void __init at91_wakeup_status(struct platform_device *pdev)
>  
>  static void at91_poweroff(void)
>  {
> -	writel(AT91_SHDW_KEY | AT91_SHDW_SHDW, at91_shdwc_base + AT91_SHDW_CR);
> -}
> -
> -static void at91_lpddr_poweroff(void)
> -{
>  	asm volatile(
>  		/* Align to cache lines */
>  		".balign 32\n\t"
> @@ -89,9 +84,11 @@ static void at91_lpddr_poweroff(void)
>  		"	ldr	r6, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t"
>  
>  		/* Power down SDRAM0 */
> +		"	tst	%0, #0\n\t"
> +		"	beq	1f\n\t"
>  		"	str	%1, [%0, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t"
>  		/* Shutdown CPU */
> -		"	str	%3, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t"
> +		"1:	str	%3, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t"
>  
>  		"	b	.\n\t"
>  		:
> @@ -177,34 +174,42 @@ static int __init at91_poweroff_probe(struct platform_device *pdev)
>  	if (pdev->dev.of_node)
>  		at91_poweroff_dt_set_wakeup_mode(pdev);
>  
> -	pm_power_off = at91_poweroff;
> -
>  	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d3-ddramc");
> -	if (!np)
> -		return 0;
> +	if (np) {
> +		mpddrc_base = of_iomap(np, 0);
> +		of_node_put(np);
>  
> -	mpddrc_base = of_iomap(np, 0);
> -	of_node_put(np);
> +		if (!mpddrc_base) {
> +			ret = -ENOMEM;
> +			goto clk_disable;
> +		}
>  
> -	if (!mpddrc_base)
> -		return 0;
> +		ddr_type = readl(mpddrc_base + AT91_DDRSDRC_MDR) &
> +				 AT91_DDRSDRC_MD;
> +		if (ddr_type != AT91_DDRSDRC_MD_LPDDR2 &&
> +		    ddr_type != AT91_DDRSDRC_MD_LPDDR3) {
> +			iounmap(mpddrc_base);
> +			mpddrc_base = NULL;
> +		}
> +	}
>  
> -	ddr_type = readl(mpddrc_base + AT91_DDRSDRC_MDR) & AT91_DDRSDRC_MD;
> -	if ((ddr_type == AT91_DDRSDRC_MD_LPDDR2) ||
> -	    (ddr_type == AT91_DDRSDRC_MD_LPDDR3))
> -		pm_power_off = at91_lpddr_poweroff;
> -	else
> -		iounmap(mpddrc_base);
> +	pm_power_off = at91_poweroff;
>  
>  	return 0;
> +
> +clk_disable:
> +	clk_disable_unprepare(sclk);
> +	return ret;
>  }
>  
>  static int __exit at91_poweroff_remove(struct platform_device *pdev)
>  {
> -	if (pm_power_off == at91_poweroff ||
> -	    pm_power_off == at91_lpddr_poweroff)
> +	if (pm_power_off == at91_poweroff)
>  		pm_power_off = NULL;
>  
> +	if (mpddrc_base)
> +		iounmap(mpddrc_base);
> +
>  	clk_disable_unprepare(sclk);
>  
>  	return 0;
> -- 
> 2.7.4
> 

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