[PATCH] PM / devfreq: remove checks for CONFIG_EXYNOS_ASV

[PATCH] PM / devfreq: remove checks for CONFIG_EXYNOS_ASV

[Paul Bolle]

Checks for CONFIG_EXYNOS_ASV were added in v3.3. But the related Kconfig
symbol has never been added to the tree. Remove these checks, as they
always evaluate to false.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
---
0) Untested.

1) I do not really care much for this patch. Two years is not very long
for dead code to remain in the tree. There is, however, a trivial issue
that makes this patch stand out from the other patches in my current
sweep of the tree for Kconfig related problems.

See, here the use of an unknown Kconfig macro hides an obvious typo: it
should either be "exynos_result_of_asv" or "exynos4_result_of_asv", but
not both. Ie, this almost certainly wouldn't have compiled even if the
Kconfig symbol EXYNOS_ASV would have been part of the tree.

2) So this makes me wonder whether there are any guidelines for using
Kconfig macros before the related Kconfig symbols are merged?

 drivers/devfreq/Kconfig              |  3 +--
 drivers/devfreq/exynos/exynos4_bus.c | 13 -------------
 2 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
index 7d2f43550700..fd985630ad7d 100644
--- a/drivers/devfreq/Kconfig
+++ b/drivers/devfreq/Kconfig
@@ -75,8 +75,7 @@ config ARM_EXYNOS4_BUS_DEVFREQ
 	  and Exynos4212/4412 memory interface and bus (vdd_mif + vdd_int).
 	  It reads PPMU counters of memory controllers and adjusts
 	  the operating frequencies and voltages with OPP support.
-	  To operate with optimal voltages, ASV support is required
-	  (CONFIG_EXYNOS_ASV).
+	  This does net yet operate with optimal voltages.
 
 config ARM_EXYNOS5_BUS_DEVFREQ
 	bool "ARM Exynos5250 Bus DEVFREQ Driver"
diff --git a/drivers/devfreq/exynos/exynos4_bus.c b/drivers/devfreq/exynos/exynos4_bus.c
index e07b0c68c715..c12911a0915d 100644
--- a/drivers/devfreq/exynos/exynos4_bus.c
+++ b/drivers/devfreq/exynos/exynos4_bus.c
@@ -25,11 +25,6 @@
 #include <linux/regulator/consumer.h>
 #include <linux/module.h>
 
-/* Exynos4 ASV has been in the mailing list, but not upstreamed, yet. */
-#ifdef CONFIG_EXYNOS_ASV
-extern unsigned int exynos_result_of_asv;
-#endif
-
 #include <mach/map.h>
 
 #include "exynos4_bus.h"
@@ -837,11 +832,7 @@ static int exynos4210_init_tables(struct busfreq_data *data)
 		data->top_divtable[i] = tmp;
 	}
 
-#ifdef CONFIG_EXYNOS_ASV
-	tmp = exynos4_result_of_asv;
-#else
 	tmp = 0; /* Max voltages for the reliability of the unknown */
-#endif
 
 	pr_debug("ASV Group of Exynos4 is %d\n", tmp);
 	/* Use merged grouping for voltage */
@@ -922,11 +913,7 @@ static int exynos4x12_init_tables(struct busfreq_data *data)
 		data->dmc_divtable[i] = tmp;
 	}
 
-#ifdef CONFIG_EXYNOS_ASV
-	tmp = exynos4_result_of_asv;
-#else
 	tmp = 0; /* Max voltages for the reliability of the unknown */
-#endif
 
 	if (tmp > 8)
 		tmp = 0;
-- 
1.9.0

Re: [PATCH] PM / devfreq: remove checks for CONFIG_EXYNOS_ASV

[MyungJoo Ham]

On Thu, May 22, 2014 at 5:37 AM, Paul Bolle <pebolle@tiscali.nl> wrote:
> Checks for CONFIG_EXYNOS_ASV were added in v3.3. But the related Kconfig
> symbol has never been added to the tree. Remove these checks, as they
> always evaluate to false.
>
> Signed-off-by: Paul Bolle <pebolle@tiscali.nl>

Thanks for pointing this out.

ASV was supposed to be merged, but it appears it failed or never attempted.

I will merge with the next batch (this week).


Cheers,
MyungJoo.

> ---
> 0) Untested.
>
> 1) I do not really care much for this patch. Two years is not very long
> for dead code to remain in the tree. There is, however, a trivial issue
> that makes this patch stand out from the other patches in my current
> sweep of the tree for Kconfig related problems.
>
> See, here the use of an unknown Kconfig macro hides an obvious typo: it
> should either be "exynos_result_of_asv" or "exynos4_result_of_asv", but
> not both. Ie, this almost certainly wouldn't have compiled even if the
> Kconfig symbol EXYNOS_ASV would have been part of the tree.
>
> 2) So this makes me wonder whether there are any guidelines for using
> Kconfig macros before the related Kconfig symbols are merged?
>
>  drivers/devfreq/Kconfig              |  3 +--
>  drivers/devfreq/exynos/exynos4_bus.c | 13 -------------
>  2 files changed, 1 insertion(+), 15 deletions(-)

Re: [PATCH] PM / devfreq: remove checks for CONFIG_EXYNOS_ASV

[MyungJoo Ham]

On Fri, May 23, 2014 at 1:52 PM, MyungJoo Ham <myungjoo.ham@samsung.com> wrote:
> On Thu, May 22, 2014 at 5:37 AM, Paul Bolle <pebolle@tiscali.nl> wrote:
>> Checks for CONFIG_EXYNOS_ASV were added in v3.3. But the related Kconfig
>> symbol has never been added to the tree. Remove these checks, as they
>> always evaluate to false.
>>
>> Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
>
> Thanks for pointing this out.
>
> ASV was supposed to be merged, but it appears it failed or never attempted.
>
> I will merge with the next batch (this week).
>
>
> Cheers,
> MyungJoo.

Uh.. ASV itself affects the power efficiency; thus, I'd like to keep
it alive, but not as the current form.

For 3.16, I'll correct the name following your report. (not going for
3.15RCx anyway)


Then, I'll let it merged into struct busfreq_data for later RCx.


Cheers,
MyungJoo.

>
>> ---
>> 0) Untested.
>>
>> 1) I do not really care much for this patch. Two years is not very long
>> for dead code to remain in the tree. There is, however, a trivial issue
>> that makes this patch stand out from the other patches in my current
>> sweep of the tree for Kconfig related problems.
>>
>> See, here the use of an unknown Kconfig macro hides an obvious typo: it
>> should either be "exynos_result_of_asv" or "exynos4_result_of_asv", but
>> not both. Ie, this almost certainly wouldn't have compiled even if the
>> Kconfig symbol EXYNOS_ASV would have been part of the tree.
>>
>> 2) So this makes me wonder whether there are any guidelines for using
>> Kconfig macros before the related Kconfig symbols are merged?
>>
>>  drivers/devfreq/Kconfig              |  3 +--
>>  drivers/devfreq/exynos/exynos4_bus.c | 13 -------------
>>  2 files changed, 1 insertion(+), 15 deletions(-)



-- 
MyungJoo Ham, Ph.D.
System S/W Lab, S/W Center, Samsung Electronics

Re: [PATCH] PM / devfreq: remove checks for CONFIG_EXYNOS_ASV

[Ben Gamari]

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MyungJoo Ham <myungjoo.ham@samsung.com> writes:

> On Fri, May 23, 2014 at 1:52 PM, MyungJoo Ham <myungjoo.ham@samsung.com> wrote:
>> On Thu, May 22, 2014 at 5:37 AM, Paul Bolle <pebolle@tiscali.nl> wrote:
>>> Checks for CONFIG_EXYNOS_ASV were added in v3.3. But the related Kconfig
>>> symbol has never been added to the tree. Remove these checks, as they
>>> always evaluate to false.
>>>
>>> Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
>>
>> Thanks for pointing this out.
>>
>> ASV was supposed to be merged, but it appears it failed or never attempted.
>>
>> I will merge with the next batch (this week).
>>
>>
>> Cheers,
>> MyungJoo.
>
> Uh.. ASV itself affects the power efficiency; thus, I'd like to keep
> it alive, but not as the current form.
>
What is the current status of ASV? I've not seen any patches since this
was sent.

Cheers,

- Ben


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