[RFC PATCH 1/4] ARM: kernel: Small fixes in save/restore common code.

[Amit Kucheria]

This patch is redundant with Lorenzo's new series[1]. Adding him to cc. I
suggest you rebase on top of his latest series.

On 11 Aug 19, Amit Daniel Kachhap wrote:
> These changes are necessary to make the retention cpuidle state work. This adds 
> support for saving more L2 registers.
> 
> Signed-off-by: Amit Daniel Kachhap <amit.kachhap at linaro.org>
> ---
>  arch/arm/common/gic.c        |    1 -
>  arch/arm/kernel/sr_helpers.h |    2 +-
>  arch/arm/mm/cache-l2x0.c     |   10 +++++++++-
>  3 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
> index d845b75..124e122 100644
> --- a/arch/arm/common/gic.c
> +++ b/arch/arm/common/gic.c
> @@ -385,7 +385,6 @@ static void gic_dist_save(unsigned int gic_nr)
>  		gic_data[gic_nr].saved_spi_enable[i] =
>  			readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
>  
> -	writel_relaxed(0, dist_base + GIC_DIST_CTRL);
>  }

He already has this bit in his tree[1]

>  /*
> diff --git a/arch/arm/kernel/sr_helpers.h b/arch/arm/kernel/sr_helpers.h
> index 1ae3a9a..5a30461 100644
> --- a/arch/arm/kernel/sr_helpers.h
> +++ b/arch/arm/kernel/sr_helpers.h
> @@ -44,7 +44,7 @@ static inline void exit_coherency(void)
>  		"mcr	p15, 0, %0, c1, c0, 1\n"
>  		 : "=&r" (v)
>  		 : "Ir" (0x40)
> -		 : );
> +		 : "cc");

He has a different fix for this.

>  }
>  #else
>  static inline void exit_coherency(void) { }
> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> index 4c99d41..f23696b 100644
> --- a/arch/arm/mm/cache-l2x0.c
> +++ b/arch/arm/mm/cache-l2x0.c
> @@ -285,7 +285,11 @@ static void l2x0_save_context(void *data, bool dormant, unsigned long end)
>  	*l2x0_regs =  readl_relaxed(l2x0_base + L2X0_TAG_LATENCY_CTRL);
>  	l2x0_regs++;
>  	*l2x0_regs =  readl_relaxed(l2x0_base + L2X0_DATA_LATENCY_CTRL);
> -
> +	l2x0_regs++;
> +	*l2x0_regs =  readl_relaxed(l2x0_base + L2X0_PREFETCH_CTRL);
> +	l2x0_regs++;
> +	*l2x0_regs =  readl_relaxed(l2x0_base + L2X0_POWER_CTRL);
> +	dormant = 0;
>  	if (!dormant) {
>  		/* clean entire L2 before disabling it*/
>  		writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY);
> @@ -325,6 +329,10 @@ static void l2x0_restore_context(void *data, bool dormant)
>  		writel_relaxed(*l2x0_regs, l2x0_base + L2X0_TAG_LATENCY_CTRL);
>  		l2x0_regs++;
>  		writel_relaxed(*l2x0_regs, l2x0_base + L2X0_DATA_LATENCY_CTRL);
> +		l2x0_regs++;
> +		writel_relaxed(*l2x0_regs, l2x0_base + L2X0_PREFETCH_CTRL);
> +		l2x0_regs++;
> +		writel_relaxed(*l2x0_regs, l2x0_base + L2X0_POWER_CTRL);
>  		/*
>  		 * If L2 is retained do not invalidate
>  		 */
> -- 
> 1.7.1

Already fixed in his tree.

[1] git://linux-arm.org/linux-2.6-lp.git sr-test-for-linaro