lkml.org 
[lkml]   [2014]   [Jun]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 2/7] ARM: EXYNOS: add support for firmware-assisted c15resume
Hi,

On 02.06.2014 14:35, Bartlomiej Zolnierkiewicz wrote:
> From: Tomasz Figa <t.figa@samsung.com>
>
> This change is a preparation for adding secure firmware support to
> EXYNOS cpuidle driver.
>
> This patch shouldn't cause any functionality changes.
>
> Signed-off-by: Tomasz Figa <t.figa@samsung.com>
> [bzolnier: splitted out from bigger patch]
> Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> ---
> arch/arm/include/asm/firmware.h | 4 ++++
> arch/arm/mach-exynos/firmware.c | 8 ++++++++
> 2 files changed, 12 insertions(+)
>
> diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h
> index c72ec47..70883c7 100644
> --- a/arch/arm/include/asm/firmware.h
> +++ b/arch/arm/include/asm/firmware.h
> @@ -41,6 +41,10 @@ struct firmware_ops {
> * Initializes L2 cache
> */
> int (*l2x0_init)(void);
> + /*
> + * Restores coprocessor 15 registers
> + */
> + int (*c15resume)(u32 *regs);

Well, this was just a kind of internal hack, so I'm not sure this is
suitable as a generic firmware operation in mainline.

I'd rather implement this as a part of a wider suspend and resume
firmware operations, where suspend would save values of cp15 registers
and resume would restore them.

Best regards,
Tomasz


\
 
 \ /
  Last update: 2014-06-02 15:41    [W:0.097 / U:1.272 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site