linux-kernel - Re: [PATCH] at91 pm: Compilation fix for at91sam926x

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Date:	Thu, 9 Aug 2007 16:53:35 +0200
From:	Hans-Jürgen Koch <hjk@...utronix.de>
To:	Andy Herzig <andrew.herzig@....com>
Cc:	andrew@...people.com, linux-kernel@...r.kernel.org,
	trivial@...nel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>
Subject: Re: [PATCH] at91 pm: Compilation fix for at91sam926x

(added linux-arm-kernel to CC)

Am Donnerstag 09 August 2007 14:10 schrieb Andy Herzig:
> Hello all,
> 
> This patch is intended to fix compilation errors when I tried to add in
> power management to my Atmel AT91SAM9260 board. First, there is no
> separate memory controller in the 9260 as there is in the 9200, so calls
> to do anything with it in pm.c fail.

Correct. I made the same discovery with my AT91SAM9263 board.

> 
> Secondly, at91_suspend_entering_slow_clock() is not declared extern by
> drivers that use it. This used to cause only a warning, but in
> 2.6.23-rc1 and beyond, it is an error.

Patch looks good to me. Kernel compiles for my 9263. Didn't test
suspend/resume yet, though.

> 
> Signed-off-by: Andrew J. Herzig <andrew.herzig@....com>

Acked-by: Hans J. Koch <hjk@...utronix.de>


> ---
> arch/arm/mach-at91/pm.c       |    5 ++++-
> drivers/serial/atmel_serial.c |    2 ++
> drivers/usb/gadget/at91_udc.c |    2 ++
> drivers/usb/host/ohci-at91.c  |    1 +
> 4 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff -uprN -X linux-2.6.23-rc2/Documentation/dontdiff
> linux-2.6.23-rc2-vanilla/arch/arm/mach-at91/pm.c
> linux-2.6.23-rc2/arch/arm/mach-at91/pm.c
> --- linux-2.6.23-rc2-vanilla/arch/arm/mach-at91/pm.c    2007-08-08
> 13:28:37.000000000 -0400
> +++ linux-2.6.23-rc2/arch/arm/mach-at91/pm.c    2007-08-08
> 13:36:43.000000000 -0400
> @@ -176,7 +176,9 @@ static int at91_pm_enter(suspend_state_t
>                          */
>                         asm("b 1f; .align 5; 1:");
>                         asm("mcr p15, 0, r0, c7, c10, 4");      /* drain
> write buffer */
> +#if defined(CONFIG_ARCH_AT91RM9200)
>                         at91_sys_write(AT91_SDRAMC_SRR, 1);     /*
> self-refresh mode */
> +#endif
>                         /* fall though to next state */
>  
>                 case PM_SUSPEND_ON:
> @@ -218,8 +220,9 @@ static int __init at91_pm_init(void)
>  #endif
>  
>         /* Disable SDRAM low-power mode.  Cannot be used with
> self-refresh. */
> +#if defined(CONFIG_ARCH_AT91RM9200)
>         at91_sys_write(AT91_SDRAMC_LPR, 0);
> -
> +#endif
>         pm_set_ops(&at91_pm_ops);
>  
>         return 0;
> diff -uprN -X linux-2.6.23-rc2/Documentation/dontdiff
> linux-2.6.23-rc2-vanilla/drivers/serial/atmel_serial.c
> linux-2.6.23-rc2/drivers/serial/atmel_serial.c
> --- linux-2.6.23-rc2-vanilla/drivers/serial/atmel_serial.c
> 2007-08-08 13:28:33.000000000 -0400
> +++ linux-2.6.23-rc2/drivers/serial/atmel_serial.c      2007-08-08
> 13:32:52.000000000 -0400
> @@ -916,6 +916,8 @@ static struct uart_driver atmel_uart = {
>  };
>  
>  #ifdef CONFIG_PM
> +extern int at91_suspend_entering_slow_clock(void);
> +
>  static int atmel_serial_suspend(struct platform_device *pdev,
> pm_message_t state)
>  {
>         struct uart_port *port = platform_get_drvdata(pdev);
> diff -uprN -X linux-2.6.23-rc2/Documentation/dontdiff
> linux-2.6.23-rc2-vanilla/drivers/usb/gadget/at91_udc.c
> linux-2.6.23-rc2/drivers/usb/gadget/at91_udc.c 
> --- linux-2.6.23-rc2-vanilla/drivers/usb/gadget/at91_udc.c
> 2007-08-08 13:28:27.000000000 -0400
> +++ linux-2.6.23-rc2/drivers/usb/gadget/at91_udc.c      2007-08-08
> 13:33:21.000000000 -0400
> @@ -1770,6 +1770,8 @@ static int __exit at91udc_remove(struct 
>  }
>  
>  #ifdef CONFIG_PM
> +extern int at91_suspend_entering_slow_clock(void);
> +
>  static int at91udc_suspend(struct platform_device *pdev, pm_message_t
> mesg)
>  {
>         struct at91_udc *udc = platform_get_drvdata(pdev);
> diff -uprN -X linux-2.6.23-rc2/Documentation/dontdiff
> linux-2.6.23-rc2-vanilla/drivers/usb/host/ohci-at91.c
> linux-2.6.23-rc2/drivers/usb/host/ohci-at91.c
> --- linux-2.6.23-rc2-vanilla/drivers/usb/host/ohci-at91.c
> 2007-08-08 13:28:27.000000000 -0400
> +++ linux-2.6.23-rc2/drivers/usb/host/ohci-at91.c       2007-08-08
> 13:32:45.000000000 -0400
> @@ -282,6 +282,7 @@ static int ohci_hcd_at91_drv_remove(stru
>  }
>  
>  #ifdef CONFIG_PM
> +extern int at91_suspend_entering_slow_clock(void);
>  
>  static int
>  ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t
> mesg)
> 
> -
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