* [PATCH] media: ov5640: Fix check for PLL1 exceeding max allowed rate
@ 2019-10-29 12:42 Adam Ford
2019-11-27 2:08 ` Adam Ford
0 siblings, 1 reply; 4+ messages in thread
From: Adam Ford @ 2019-10-29 12:42 UTC (permalink / raw)
To: linux-media
Cc: mchehab, slongerbeam, maxime.ripard, adam.ford, linux-kernel, Adam Ford
The variable _rate is by ov5640_compute_sys_clk() which returns
zero if the PLL exceeds 1GHz. Unfortunately, the check to see
if the max PLL1 output is checking 'rate' and not '_rate' and
'rate' does not ever appear to be 0.
This patch changes the check against the returned value of
'_rate' to determine if the PLL1 output exceeds 1GHz.
Fixes: aa2882481cad ("media: ov5640: Adjust the clock based on the expected rate")
Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 5e495c833d32..bb968e764f31 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -874,7 +874,7 @@ static unsigned long ov5640_calc_sys_clk(struct ov5640_dev *sensor,
* We have reached the maximum allowed PLL1 output,
* increase sysdiv.
*/
- if (!rate)
+ if (!_rate)
break;
/*
--
2.17.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] media: ov5640: Fix check for PLL1 exceeding max allowed rate
2019-10-29 12:42 [PATCH] media: ov5640: Fix check for PLL1 exceeding max allowed rate Adam Ford
@ 2019-11-27 2:08 ` Adam Ford
2019-11-28 10:21 ` Jacopo Mondi
0 siblings, 1 reply; 4+ messages in thread
From: Adam Ford @ 2019-11-27 2:08 UTC (permalink / raw)
To: linux-media
Cc: Mauro Carvalho Chehab, Steve Longerbeam, Maxime Ripard,
Adam Ford, Linux Kernel Mailing List
On Tue, Oct 29, 2019 at 7:42 AM Adam Ford <aford173@gmail.com> wrote:
>
> The variable _rate is by ov5640_compute_sys_clk() which returns
> zero if the PLL exceeds 1GHz. Unfortunately, the check to see
> if the max PLL1 output is checking 'rate' and not '_rate' and
> 'rate' does not ever appear to be 0.
>
> This patch changes the check against the returned value of
> '_rate' to determine if the PLL1 output exceeds 1GHz.
>
> Fixes: aa2882481cad ("media: ov5640: Adjust the clock based on the expected rate")
>
I haven't seen any responses to this patch. Has anyone had a chance
to review this? It's been nearly a month.
I think it would be appropriate to backport to stable if deemed acceptable.
adam
> Signed-off-by: Adam Ford <aford173@gmail.com>
>
> diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> index 5e495c833d32..bb968e764f31 100644
> --- a/drivers/media/i2c/ov5640.c
> +++ b/drivers/media/i2c/ov5640.c
> @@ -874,7 +874,7 @@ static unsigned long ov5640_calc_sys_clk(struct ov5640_dev *sensor,
> * We have reached the maximum allowed PLL1 output,
> * increase sysdiv.
> */
> - if (!rate)
> + if (!_rate)
> break;
>
> /*
> --
> 2.17.1
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] media: ov5640: Fix check for PLL1 exceeding max allowed rate
2019-11-27 2:08 ` Adam Ford
@ 2019-11-28 10:21 ` Jacopo Mondi
2019-11-28 14:28 ` Adam Ford
0 siblings, 1 reply; 4+ messages in thread
From: Jacopo Mondi @ 2019-11-28 10:21 UTC (permalink / raw)
To: Adam Ford
Cc: linux-media, Mauro Carvalho Chehab, Steve Longerbeam,
Maxime Ripard, Adam Ford, Linux Kernel Mailing List
[-- Attachment #1: Type: text/plain, Size: 1879 bytes --]
Hi Adam,
On Tue, Nov 26, 2019 at 08:08:05PM -0600, Adam Ford wrote:
> On Tue, Oct 29, 2019 at 7:42 AM Adam Ford <aford173@gmail.com> wrote:
> >
> > The variable _rate is by ov5640_compute_sys_clk() which returns
> > zero if the PLL exceeds 1GHz. Unfortunately, the check to see
> > if the max PLL1 output is checking 'rate' and not '_rate' and
> > 'rate' does not ever appear to be 0.
This seems a bit convoluted. What about:
"The PLL calculation routine checks the wrong variable 'rate' to
verify that the calculated PLL1 output frequency does not exceed
1GHz. Fix this by using the correct '_rate' one."
Or something against these lines
> >
> > This patch changes the check against the returned value of
> > '_rate' to determine if the PLL1 output exceeds 1GHz.
> >
> > Fixes: aa2882481cad ("media: ov5640: Adjust the clock based on the expected rate")
> >
>
> I haven't seen any responses to this patch. Has anyone had a chance
> to review this? It's been nearly a month.
You're totally right! Sorry about this
> I think it would be appropriate to backport to stable if deemed acceptable.
>
Indeed! This fixes a real issue
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Thanks
j
> adam
>
> > Signed-off-by: Adam Ford <aford173@gmail.com>
> >
> > diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> > index 5e495c833d32..bb968e764f31 100644
> > --- a/drivers/media/i2c/ov5640.c
> > +++ b/drivers/media/i2c/ov5640.c
> > @@ -874,7 +874,7 @@ static unsigned long ov5640_calc_sys_clk(struct ov5640_dev *sensor,
> > * We have reached the maximum allowed PLL1 output,
> > * increase sysdiv.
> > */
> > - if (!rate)
> > + if (!_rate)
> > break;
> >
> > /*
> > --
> > 2.17.1
> >
[-- Attachment #2: signature.asc --]
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] media: ov5640: Fix check for PLL1 exceeding max allowed rate
2019-11-28 10:21 ` Jacopo Mondi
@ 2019-11-28 14:28 ` Adam Ford
0 siblings, 0 replies; 4+ messages in thread
From: Adam Ford @ 2019-11-28 14:28 UTC (permalink / raw)
To: Jacopo Mondi
Cc: linux-media, Mauro Carvalho Chehab, Steve Longerbeam,
Maxime Ripard, Adam Ford, Linux Kernel Mailing List
On Thu, Nov 28, 2019 at 4:19 AM Jacopo Mondi <jacopo@jmondi.org> wrote:
>
> Hi Adam,
>
> On Tue, Nov 26, 2019 at 08:08:05PM -0600, Adam Ford wrote:
> > On Tue, Oct 29, 2019 at 7:42 AM Adam Ford <aford173@gmail.com> wrote:
> > >
> > > The variable _rate is by ov5640_compute_sys_clk() which returns
> > > zero if the PLL exceeds 1GHz. Unfortunately, the check to see
> > > if the max PLL1 output is checking 'rate' and not '_rate' and
> > > 'rate' does not ever appear to be 0.
>
> This seems a bit convoluted. What about:
>
> "The PLL calculation routine checks the wrong variable 'rate' to
> verify that the calculated PLL1 output frequency does not exceed
> 1GHz. Fix this by using the correct '_rate' one."
>
> Or something against these lines
That makes sense.
I'll do a V2 for this patch and change the description and add your
'acked-by' note to it.
I probably won't get to it until this weekend, since today is a
holiday in the US, and I am traveling.
adam
>
> > >
> > > This patch changes the check against the returned value of
> > > '_rate' to determine if the PLL1 output exceeds 1GHz.
> > >
> > > Fixes: aa2882481cad ("media: ov5640: Adjust the clock based on the expected rate")
> > >
> >
> > I haven't seen any responses to this patch. Has anyone had a chance
> > to review this? It's been nearly a month.
>
> You're totally right! Sorry about this
>
> > I think it would be appropriate to backport to stable if deemed acceptable.
> >
>
> Indeed! This fixes a real issue
>
> Acked-by: Jacopo Mondi <jacopo@jmondi.org>
>
> Thanks
> j
>
> > adam
> >
> > > Signed-off-by: Adam Ford <aford173@gmail.com>
> > >
> > > diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> > > index 5e495c833d32..bb968e764f31 100644
> > > --- a/drivers/media/i2c/ov5640.c
> > > +++ b/drivers/media/i2c/ov5640.c
> > > @@ -874,7 +874,7 @@ static unsigned long ov5640_calc_sys_clk(struct ov5640_dev *sensor,
> > > * We have reached the maximum allowed PLL1 output,
> > > * increase sysdiv.
> > > */
> > > - if (!rate)
> > > + if (!_rate)
> > > break;
> > >
> > > /*
> > > --
> > > 2.17.1
> > >
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2019-11-28 14:29 UTC | newest]
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2019-10-29 12:42 [PATCH] media: ov5640: Fix check for PLL1 exceeding max allowed rate Adam Ford
2019-11-27 2:08 ` Adam Ford
2019-11-28 10:21 ` Jacopo Mondi
2019-11-28 14:28 ` Adam Ford
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