[PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[Yilu Mao]

If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
register will not be saved in l2x0_saved_regs. Therefore we can not use
l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
by saving aux ctrl in l2x0_saved_regs just after it's being read from
the register.
And in case some bits of aux ctrl register are reserved, re-read and
save it properly after set it if l2x0 is disabled before init.

Change-Id: I54f3002274ffe9cdc667dba81e36e08f2e121467
Signed-off-by: Yilu Mao <ylmao@marvell.com>
---
 arch/arm/mm/cache-l2x0.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index a53fd2a..9893e58 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 	cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
 	aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 
+	/*
+	 * In case l2x controller is enabled, the aux ctrl register
+	 * can't be set. So the original value should be stored in
+	 * the l2x0_saved_regs for restoring when resume.
+	 */
+	l2x0_saved_regs.aux_ctrl = aux;
+
 	aux &= aux_mask;
 	aux |= aux_val;
 
@@ -364,6 +371,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 		/* l2x0 controller is disabled */
 		writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
 
+		/* Re-read it in case some bits are reserved. */
+		aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 		l2x0_saved_regs.aux_ctrl = aux;
 
 		l2x0_inv_all();
-- 
1.7.5.4

[PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[Yilu Mao]

If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
register will not be saved in l2x0_saved_regs. Therefore we can not use
l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
by saving aux ctrl in l2x0_saved_regs just after it's being read from
the register.
And in case some bits of aux ctrl register are reserved, re-read and
save it properly after set it if l2x0 is disabled before init.

Change-Id: I54f3002274ffe9cdc667dba81e36e08f2e121467
Signed-off-by: Yilu Mao <ylmao@marvell.com>
---
 arch/arm/mm/cache-l2x0.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index a53fd2a..9893e58 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 	cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
 	aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 
+	/*
+	 * In case l2x controller is enabled, the aux ctrl register
+	 * can't be set. So the original value should be stored in
+	 * the l2x0_saved_regs for restoring when resume.
+	 */
+	l2x0_saved_regs.aux_ctrl = aux;
+
 	aux &= aux_mask;
 	aux |= aux_val;
 
@@ -364,6 +371,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 		/* l2x0 controller is disabled */
 		writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
 
+		/* Re-read it in case some bits are reserved. */
+		aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 		l2x0_saved_regs.aux_ctrl = aux;
 
 		l2x0_inv_all();
-- 
1.7.5.4

Re: [PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[Catalin Marinas]

On 30 April 2012 14:16, Yilu Mao <ylmao@marvell.com> wrote:
> If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
> register will not be saved in l2x0_saved_regs. Therefore we can not use
> l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
> by saving aux ctrl in l2x0_saved_regs just after it's being read from
> the register.
> And in case some bits of aux ctrl register are reserved, re-read and
> save it properly after set it if l2x0 is disabled before init.
>
> Change-Id: I54f3002274ffe9cdc667dba81e36e08f2e121467
> Signed-off-by: Yilu Mao <ylmao@marvell.com>
> ---
>  arch/arm/mm/cache-l2x0.c |    9 +++++++++
>  1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> index a53fd2a..9893e58 100644
> --- a/arch/arm/mm/cache-l2x0.c
> +++ b/arch/arm/mm/cache-l2x0.c
> @@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
>        cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
>        aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
>
> +       /*
> +        * In case l2x controller is enabled, the aux ctrl register
> +        * can't be set. So the original value should be stored in
> +        * the l2x0_saved_regs for restoring when resume.
> +        */
> +       l2x0_saved_regs.aux_ctrl = aux;

Why not move this

> +
>        aux &= aux_mask;
>        aux |= aux_val;
>
> @@ -364,6 +371,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
>                /* l2x0 controller is disabled */
>                writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
>
> +               /* Re-read it in case some bits are reserved. */
> +               aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);

and this

>                l2x0_saved_regs.aux_ctrl = aux;
>
>                l2x0_inv_all();

somewhere after the if block and we only read the aux once. The
comment may no longer make sense though.

-- 
Catalin

[PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[Catalin Marinas]

On 30 April 2012 14:16, Yilu Mao <ylmao@marvell.com> wrote:
> If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
> register will not be saved in l2x0_saved_regs. Therefore we can not use
> l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
> by saving aux ctrl in l2x0_saved_regs just after it's being read from
> the register.
> And in case some bits of aux ctrl register are reserved, re-read and
> save it properly after set it if l2x0 is disabled before init.
>
> Change-Id: I54f3002274ffe9cdc667dba81e36e08f2e121467
> Signed-off-by: Yilu Mao <ylmao@marvell.com>
> ---
> ?arch/arm/mm/cache-l2x0.c | ? ?9 +++++++++
> ?1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> index a53fd2a..9893e58 100644
> --- a/arch/arm/mm/cache-l2x0.c
> +++ b/arch/arm/mm/cache-l2x0.c
> @@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
> ? ? ? ?cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
> ? ? ? ?aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
>
> + ? ? ? /*
> + ? ? ? ?* In case l2x controller is enabled, the aux ctrl register
> + ? ? ? ?* can't be set. So the original value should be stored in
> + ? ? ? ?* the l2x0_saved_regs for restoring when resume.
> + ? ? ? ?*/
> + ? ? ? l2x0_saved_regs.aux_ctrl = aux;

Why not move this

> +
> ? ? ? ?aux &= aux_mask;
> ? ? ? ?aux |= aux_val;
>
> @@ -364,6 +371,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
> ? ? ? ? ? ? ? ?/* l2x0 controller is disabled */
> ? ? ? ? ? ? ? ?writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
>
> + ? ? ? ? ? ? ? /* Re-read it in case some bits are reserved. */
> + ? ? ? ? ? ? ? aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);

and this

> ? ? ? ? ? ? ? ?l2x0_saved_regs.aux_ctrl = aux;
>
> ? ? ? ? ? ? ? ?l2x0_inv_all();

somewhere after the if block and we only read the aux once. The
comment may no longer make sense though.

-- 
Catalin

Re: [PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[Yilu Mao]

On 04/30/2012 09:34 PM, Catalin Marinas wrote:
> On 30 April 2012 14:16, Yilu Mao<ylmao@marvell.com>  wrote:
>> If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
>> register will not be saved in l2x0_saved_regs. Therefore we can not use
>> l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
>> by saving aux ctrl in l2x0_saved_regs just after it's being read from
>> the register.
>> And in case some bits of aux ctrl register are reserved, re-read and
>> save it properly after set it if l2x0 is disabled before init.
>>
>> Change-Id: I54f3002274ffe9cdc667dba81e36e08f2e121467
>> Signed-off-by: Yilu Mao<ylmao@marvell.com>
>> ---
>>   arch/arm/mm/cache-l2x0.c |    9 +++++++++
>>   1 files changed, 9 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
>> index a53fd2a..9893e58 100644
>> --- a/arch/arm/mm/cache-l2x0.c
>> +++ b/arch/arm/mm/cache-l2x0.c
>> @@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
>>         cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
>>         aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
>>
>> +       /*
>> +        * In case l2x controller is enabled, the aux ctrl register
>> +        * can't be set. So the original value should be stored in
>> +        * the l2x0_saved_regs for restoring when resume.
>> +        */
>> +       l2x0_saved_regs.aux_ctrl = aux;
>
> Why not move this
>
>> +
>>         aux&= aux_mask;
>>         aux |= aux_val;
>>
>> @@ -364,6 +371,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
>>                 /* l2x0 controller is disabled */
>>                 writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
>>
>> +               /* Re-read it in case some bits are reserved. */
>> +               aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
>
> and this
>
>>                 l2x0_saved_regs.aux_ctrl = aux;
>>
>>                 l2x0_inv_all();
>
> somewhere after the if block and we only read the aux once. The
> comment may no longer make sense though.
>
Hi Catalin,

I want to make it clear before I provide a new patch. :)
We can't only read once because we must read it before handle the 
aux_val and aux_mask arguments.
Do you still want the "l2x0_saved_regs.aux_ctrl = aux;" operation only 
located after the "if"?
If so, I will provide a patch for it.

-- 
Thanks.

Best Wishes,
Yilu Mao

[PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[Yilu Mao]

On 04/30/2012 09:34 PM, Catalin Marinas wrote:
> On 30 April 2012 14:16, Yilu Mao<ylmao@marvell.com>  wrote:
>> If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
>> register will not be saved in l2x0_saved_regs. Therefore we can not use
>> l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
>> by saving aux ctrl in l2x0_saved_regs just after it's being read from
>> the register.
>> And in case some bits of aux ctrl register are reserved, re-read and
>> save it properly after set it if l2x0 is disabled before init.
>>
>> Change-Id: I54f3002274ffe9cdc667dba81e36e08f2e121467
>> Signed-off-by: Yilu Mao<ylmao@marvell.com>
>> ---
>>   arch/arm/mm/cache-l2x0.c |    9 +++++++++
>>   1 files changed, 9 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
>> index a53fd2a..9893e58 100644
>> --- a/arch/arm/mm/cache-l2x0.c
>> +++ b/arch/arm/mm/cache-l2x0.c
>> @@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
>>         cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
>>         aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
>>
>> +       /*
>> +        * In case l2x controller is enabled, the aux ctrl register
>> +        * can't be set. So the original value should be stored in
>> +        * the l2x0_saved_regs for restoring when resume.
>> +        */
>> +       l2x0_saved_regs.aux_ctrl = aux;
>
> Why not move this
>
>> +
>>         aux&= aux_mask;
>>         aux |= aux_val;
>>
>> @@ -364,6 +371,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
>>                 /* l2x0 controller is disabled */
>>                 writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
>>
>> +               /* Re-read it in case some bits are reserved. */
>> +               aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
>
> and this
>
>>                 l2x0_saved_regs.aux_ctrl = aux;
>>
>>                 l2x0_inv_all();
>
> somewhere after the if block and we only read the aux once. The
> comment may no longer make sense though.
>
Hi Catalin,

I want to make it clear before I provide a new patch. :)
We can't only read once because we must read it before handle the 
aux_val and aux_mask arguments.
Do you still want the "l2x0_saved_regs.aux_ctrl = aux;" operation only 
located after the "if"?
If so, I will provide a patch for it.

-- 
Thanks.

Best Wishes,
Yilu Mao

Re: [PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[Catalin Marinas]

On Wed, May 02, 2012 at 02:17:45AM +0100, Yilu Mao wrote:
> On 04/30/2012 09:34 PM, Catalin Marinas wrote:
> > On 30 April 2012 14:16, Yilu Mao<ylmao@marvell.com>  wrote:
> >> If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
> >> register will not be saved in l2x0_saved_regs. Therefore we can not use
> >> l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
> >> by saving aux ctrl in l2x0_saved_regs just after it's being read from
> >> the register.
> >> And in case some bits of aux ctrl register are reserved, re-read and
> >> save it properly after set it if l2x0 is disabled before init.
> >>
> >> Change-Id: I54f3002274ffe9cdc667dba81e36e08f2e121467
> >> Signed-off-by: Yilu Mao<ylmao@marvell.com>
> >> ---
> >>   arch/arm/mm/cache-l2x0.c |    9 +++++++++
> >>   1 files changed, 9 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> >> index a53fd2a..9893e58 100644
> >> --- a/arch/arm/mm/cache-l2x0.c
> >> +++ b/arch/arm/mm/cache-l2x0.c
> >> @@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
> >>         cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
> >>         aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
> >>
> >> +       /*
> >> +        * In case l2x controller is enabled, the aux ctrl register
> >> +        * can't be set. So the original value should be stored in
> >> +        * the l2x0_saved_regs for restoring when resume.
> >> +        */
> >> +       l2x0_saved_regs.aux_ctrl = aux;
> >
> > Why not move this
> >
> >> +
> >>         aux&= aux_mask;
> >>         aux |= aux_val;
> >>
> >> @@ -364,6 +371,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
> >>                 /* l2x0 controller is disabled */
> >>                 writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
> >>
> >> +               /* Re-read it in case some bits are reserved. */
> >> +               aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
> >
> > and this
> >
> >>                 l2x0_saved_regs.aux_ctrl = aux;
> >>
> >>                 l2x0_inv_all();
> >
> > somewhere after the if block and we only read the aux once. The
> > comment may no longer make sense though.
> 
> I want to make it clear before I provide a new patch. :)
> We can't only read once because we must read it before handle the 
> aux_val and aux_mask arguments.

I was thinking about something like this:


diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 361a628..fbd8903 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -371,14 +371,15 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 		/* l2x0 controller is disabled */
 		writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
 
-		l2x0_saved_regs.aux_ctrl = aux;
-
 		l2x0_inv_all();
 
 		/* enable L2X0 */
 		writel_relaxed(1, l2x0_base + L2X0_CTRL);
 	}
 
+	aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
+	l2x0_saved_regs.aux_ctrl = aux;
+
 	outer_cache.inv_range = l2x0_inv_range;
 	outer_cache.clean_range = l2x0_clean_range;
 	outer_cache.flush_range = l2x0_flush_range;


-- 
Catalin

[PATCH v4] ARM: cache-l2x0.c: save aux ctrl for resume in case l2x0 is enabled before init

[Catalin Marinas]

On Wed, May 02, 2012 at 02:17:45AM +0100, Yilu Mao wrote:
> On 04/30/2012 09:34 PM, Catalin Marinas wrote:
> > On 30 April 2012 14:16, Yilu Mao<ylmao@marvell.com>  wrote:
> >> If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
> >> register will not be saved in l2x0_saved_regs. Therefore we can not use
> >> l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
> >> by saving aux ctrl in l2x0_saved_regs just after it's being read from
> >> the register.
> >> And in case some bits of aux ctrl register are reserved, re-read and
> >> save it properly after set it if l2x0 is disabled before init.
> >>
> >> Change-Id: I54f3002274ffe9cdc667dba81e36e08f2e121467
> >> Signed-off-by: Yilu Mao<ylmao@marvell.com>
> >> ---
> >>   arch/arm/mm/cache-l2x0.c |    9 +++++++++
> >>   1 files changed, 9 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> >> index a53fd2a..9893e58 100644
> >> --- a/arch/arm/mm/cache-l2x0.c
> >> +++ b/arch/arm/mm/cache-l2x0.c
> >> @@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
> >>         cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
> >>         aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
> >>
> >> +       /*
> >> +        * In case l2x controller is enabled, the aux ctrl register
> >> +        * can't be set. So the original value should be stored in
> >> +        * the l2x0_saved_regs for restoring when resume.
> >> +        */
> >> +       l2x0_saved_regs.aux_ctrl = aux;
> >
> > Why not move this
> >
> >> +
> >>         aux&= aux_mask;
> >>         aux |= aux_val;
> >>
> >> @@ -364,6 +371,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
> >>                 /* l2x0 controller is disabled */
> >>                 writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
> >>
> >> +               /* Re-read it in case some bits are reserved. */
> >> +               aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
> >
> > and this
> >
> >>                 l2x0_saved_regs.aux_ctrl = aux;
> >>
> >>                 l2x0_inv_all();
> >
> > somewhere after the if block and we only read the aux once. The
> > comment may no longer make sense though.
> 
> I want to make it clear before I provide a new patch. :)
> We can't only read once because we must read it before handle the 
> aux_val and aux_mask arguments.

I was thinking about something like this:


diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 361a628..fbd8903 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -371,14 +371,15 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 		/* l2x0 controller is disabled */
 		writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
 
-		l2x0_saved_regs.aux_ctrl = aux;
-
 		l2x0_inv_all();
 
 		/* enable L2X0 */
 		writel_relaxed(1, l2x0_base + L2X0_CTRL);
 	}
 
+	aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
+	l2x0_saved_regs.aux_ctrl = aux;
+
 	outer_cache.inv_range = l2x0_inv_range;
 	outer_cache.clean_range = l2x0_clean_range;
 	outer_cache.flush_range = l2x0_flush_range;


-- 
Catalin