* [PATCH] i2c: octeon: Make the timeout 1*HZ instead of 1 jiffy
@ 2011-01-24 12:05 Bernhard Walle
2011-01-24 12:14 ` Jean Delvare
0 siblings, 1 reply; 6+ messages in thread
From: Bernhard Walle @ 2011-01-24 12:05 UTC (permalink / raw)
To: ben-linux; +Cc: ddaney, ralf, linux-i2c, linux-kernel
Since the timeout in the struct i2c_adapter use jiffies as unit and a
timeout should be independent of CONFIG_HZ and most drivers that specify
a timeout here use just HZ, change the i2c-octeon driver to use 1*HZ
(which is a second), too.
Signed-off-by: Bernhard Walle <walle@corscience.de>
---
drivers/i2c/busses/i2c-octeon.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c
index 0fe1102..537a4ee 100644
--- a/drivers/i2c/busses/i2c-octeon.c
+++ b/drivers/i2c/busses/i2c-octeon.c
@@ -460,7 +460,7 @@ static struct i2c_adapter octeon_i2c_ops = {
.owner = THIS_MODULE,
.name = "OCTEON adapter",
.algo = &octeon_i2c_algo,
- .timeout = 2,
+ .timeout = HZ,
};
/**
--
1.7.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] i2c: octeon: Make the timeout 1*HZ instead of 1 jiffy
2011-01-24 12:05 [PATCH] i2c: octeon: Make the timeout 1*HZ instead of 1 jiffy Bernhard Walle
@ 2011-01-24 12:14 ` Jean Delvare
2011-01-24 12:37 ` Bernhard Walle
0 siblings, 1 reply; 6+ messages in thread
From: Jean Delvare @ 2011-01-24 12:14 UTC (permalink / raw)
To: Bernhard Walle; +Cc: ben-linux, ddaney, ralf, linux-i2c, linux-kernel
Hi Bernhard,
On Mon, 24 Jan 2011 13:05:41 +0100, Bernhard Walle wrote:
> Since the timeout in the struct i2c_adapter use jiffies as unit and a
> timeout should be independent of CONFIG_HZ and most drivers that specify
> a timeout here use just HZ, change the i2c-octeon driver to use 1*HZ
> (which is a second), too.
>
> Signed-off-by: Bernhard Walle <walle@corscience.de>
> ---
> drivers/i2c/busses/i2c-octeon.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c
> index 0fe1102..537a4ee 100644
> --- a/drivers/i2c/busses/i2c-octeon.c
> +++ b/drivers/i2c/busses/i2c-octeon.c
> @@ -460,7 +460,7 @@ static struct i2c_adapter octeon_i2c_ops = {
> .owner = THIS_MODULE,
> .name = "OCTEON adapter",
> .algo = &octeon_i2c_algo,
> - .timeout = 2,
> + .timeout = HZ,
> };
>
> /**
This is a large timeout value, much larger than any value the
i2c-octeon driver was using today for any possible value of HZ.
Wouldn't it make more sense to set it to HZ / 50, which is 2 for HZ =
100, leaving the setting unchanged for this common case at least?
--
Jean Delvare
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] i2c: octeon: Make the timeout 1*HZ instead of 1 jiffy
2011-01-24 12:14 ` Jean Delvare
@ 2011-01-24 12:37 ` Bernhard Walle
2011-01-24 12:40 ` [PATCH] i2c: octeon: Make the timeout independent of CONFIG_HZ Bernhard Walle
0 siblings, 1 reply; 6+ messages in thread
From: Bernhard Walle @ 2011-01-24 12:37 UTC (permalink / raw)
To: Jean Delvare; +Cc: ben-linux, ddaney, ralf, linux-i2c, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 965 bytes --]
Hi Jean,
Am 24.01.2011 13:14, schrieb Jean Delvare:
>> .owner = THIS_MODULE,
>> .name = "OCTEON adapter",
>> .algo = &octeon_i2c_algo,
>> - .timeout = 2,
>> + .timeout = HZ,
>> };
>
> This is a large timeout value, much larger than any value the
> i2c-octeon driver was using today for any possible value of HZ.
> Wouldn't it make more sense to set it to HZ / 50, which is 2 for HZ =
> 100, leaving the setting unchanged for this common case at least?
To be honest, I had problems with timeout=2 that go away with
timeout=HZ. But I cannot be sure that this is a problem with my hardware
that is not present with other devices.
The drivers that use HZ are i2c-mpc.c and i2c-pca-platform.c, but I
don't know the hardware that much so that I really can compare the values.
So yes, you're right. A patch modifying the timeout value should be an
extra patch, so I will resend the current patch to use HZ/50.
Regards,
Bernhard
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] i2c: octeon: Make the timeout independent of CONFIG_HZ
2011-01-24 12:37 ` Bernhard Walle
@ 2011-01-24 12:40 ` Bernhard Walle
2011-01-24 14:00 ` Jean Delvare
0 siblings, 1 reply; 6+ messages in thread
From: Bernhard Walle @ 2011-01-24 12:40 UTC (permalink / raw)
To: ben-linux; +Cc: ddaney, ralf, linux-i2c, linux-kernel
Since the timeout in the struct i2c_adapter use jiffies as unit and a
timeout should be independent of CONFIG_HZ, use a value of HZ/50 which
is equal to the current value 2 for CONFIG_HZ=100.
Signed-off-by: Bernhard Walle <walle@corscience.de>
---
drivers/i2c/busses/i2c-octeon.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c
index 4cffda5..d07e5c7 100644
--- a/drivers/i2c/busses/i2c-octeon.c
+++ b/drivers/i2c/busses/i2c-octeon.c
@@ -469,7 +469,7 @@ static struct i2c_adapter octeon_i2c_ops = {
.owner = THIS_MODULE,
.name = "OCTEON adapter",
.algo = &octeon_i2c_algo,
- .timeout = 2,
+ .timeout = HZ/50,
};
/**
--
1.7.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] i2c: octeon: Make the timeout independent of CONFIG_HZ
2011-01-24 12:40 ` [PATCH] i2c: octeon: Make the timeout independent of CONFIG_HZ Bernhard Walle
@ 2011-01-24 14:00 ` Jean Delvare
2011-03-16 13:32 ` Jean Delvare
0 siblings, 1 reply; 6+ messages in thread
From: Jean Delvare @ 2011-01-24 14:00 UTC (permalink / raw)
To: Bernhard Walle; +Cc: ben-linux, ddaney, ralf, linux-i2c, linux-kernel
On Mon, 24 Jan 2011 13:40:26 +0100, Bernhard Walle wrote:
> Since the timeout in the struct i2c_adapter use jiffies as unit and a
> timeout should be independent of CONFIG_HZ, use a value of HZ/50 which
> is equal to the current value 2 for CONFIG_HZ=100.
>
> Signed-off-by: Bernhard Walle <walle@corscience.de>
Acked-by: Jean Delvare <khali@linux-fr.org>
Ben, please apply.
> ---
> drivers/i2c/busses/i2c-octeon.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c
> index 4cffda5..d07e5c7 100644
> --- a/drivers/i2c/busses/i2c-octeon.c
> +++ b/drivers/i2c/busses/i2c-octeon.c
> @@ -469,7 +469,7 @@ static struct i2c_adapter octeon_i2c_ops = {
> .owner = THIS_MODULE,
> .name = "OCTEON adapter",
> .algo = &octeon_i2c_algo,
> - .timeout = 2,
> + .timeout = HZ/50,
> };
>
> /**
--
Jean Delvare
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] i2c: octeon: Make the timeout independent of CONFIG_HZ
2011-01-24 14:00 ` Jean Delvare
@ 2011-03-16 13:32 ` Jean Delvare
0 siblings, 0 replies; 6+ messages in thread
From: Jean Delvare @ 2011-03-16 13:32 UTC (permalink / raw)
To: ben-linux; +Cc: Bernhard Walle, ddaney, ralf, linux-i2c, linux-kernel
On Mon, 24 Jan 2011 15:00:05 +0100, Jean Delvare wrote:
> On Mon, 24 Jan 2011 13:40:26 +0100, Bernhard Walle wrote:
> > Since the timeout in the struct i2c_adapter use jiffies as unit and a
> > timeout should be independent of CONFIG_HZ, use a value of HZ/50 which
> > is equal to the current value 2 for CONFIG_HZ=100.
> >
> > Signed-off-by: Bernhard Walle <walle@corscience.de>
>
> Acked-by: Jean Delvare <khali@linux-fr.org>
>
> Ben, please apply.
Ben, I can't see this fix in your tree, it seems it got lost?
> > ---
> > drivers/i2c/busses/i2c-octeon.c | 2 +-
> > 1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c
> > index 4cffda5..d07e5c7 100644
> > --- a/drivers/i2c/busses/i2c-octeon.c
> > +++ b/drivers/i2c/busses/i2c-octeon.c
> > @@ -469,7 +469,7 @@ static struct i2c_adapter octeon_i2c_ops = {
> > .owner = THIS_MODULE,
> > .name = "OCTEON adapter",
> > .algo = &octeon_i2c_algo,
> > - .timeout = 2,
> > + .timeout = HZ/50,
> > };
> >
> > /**
>
>
--
Jean Delvare
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-03-16 13:33 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2011-01-24 12:05 [PATCH] i2c: octeon: Make the timeout 1*HZ instead of 1 jiffy Bernhard Walle
2011-01-24 12:14 ` Jean Delvare
2011-01-24 12:37 ` Bernhard Walle
2011-01-24 12:40 ` [PATCH] i2c: octeon: Make the timeout independent of CONFIG_HZ Bernhard Walle
2011-01-24 14:00 ` Jean Delvare
2011-03-16 13:32 ` Jean Delvare
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