linux-kernel - Re: [PATCH] media: ov5640: Fix set 15fps regression

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Date:   Tue, 29 Jan 2019 10:00:35 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Jagan Teki <jagan@...rulasolutions.com>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        linux-media <linux-media@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-amarula@...rulasolutions.com
Subject: Re: [PATCH] media: ov5640: Fix set 15fps regression

On Mon, Jan 28, 2019 at 09:33:04AM +0100, Jacopo Mondi wrote:
> Hi everyone,
> 
> On Mon, Jan 28, 2019 at 01:20:37PM +0530, Jagan Teki wrote:
> > On Fri, Jan 25, 2019 at 9:10 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
> > >
> > > On Thu, Jan 24, 2019 at 11:28:01PM +0530, Jagan Teki wrote:
> > > > The ov5640_try_frame_interval operation updates the FPS as per user
> > > > input based on default ov5640_frame_rate, OV5640_30_FPS which is failed
> > > > to update when user trigger 15fps.
> > > >
> > > > So, initialize the default ov5640_frame_rate to OV5640_15_FPS so-that
> > > > it can satisfy to update all fps.
> > > >
> > > > Fixes: 5a3ad937bc78 ("media: ov5640: Make the return rate type more explicit")
> > > > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > >
> > > I'm pretty sure I tested this and it was working fine. You're
> > > mentionning a regression, but what regression is there exactly (ie,
> > > what was working before that commit that doesn't work anymore?). What
> > > tools/commands are you using to see this behaviour?
> >
> 
> I think Jagan's right, here.
> 
> For the 15FPS use case, the below condition in the for loop of
> ov5640_try_frame_interval() never gets satisfied (0 < 0 ?) and 'rate' retains
> its initial value of 30FPS.
> 
> 		if (abs(curr_fps - fps) < abs(best_fps - fps)) {
> 			best_fps = curr_fps;
> 			rate = i;
> 		}
> 
> To make more clear what's happening, I would initialize 'rate' just
> before 'best_fps' before the for loop. Anyway, please add:
> Acked-by: Jacopo Mondi <jacopo@...ndi.org>
> 
> Maxime, does this make sense to you?

With that explanation in the commit log, yes.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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