linux-kernel - Re: [PATCH v3 5/6] drm: atmel-hlcdc: prefer a lower pixel-clock than requested

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Message-ID: <20200104171205.GA8724@ravnborg.org>
Date:   Sat, 4 Jan 2020 18:12:05 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     alexandre.belloni@...tlin.com, airlied@...ux.ie,
        nicolas.ferre@...rochip.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, boris.brezillon@...tlin.com,
        lee.jones@...aro.org, peda@...ntia.se,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 5/6] drm: atmel-hlcdc: prefer a lower pixel-clock than
 requested

Hi Claudiu

On Thu, Jan 02, 2020 at 10:08:48AM +0100, Sam Ravnborg wrote:
> On Wed, Dec 18, 2019 at 02:28:28PM +0200, Claudiu Beznea wrote:
> > From: Peter Rosin <peda@...ntia.se>
> > 
> > The intention was to only select a higher pixel-clock rate than the
> > requested, if a slight overclocking would result in a rate significantly
> > closer to the requested rate than if the conservative lower pixel-clock
> > rate is selected. The fixed patch has the logic the other way around and
> > actually prefers the higher frequency. Fix that.
> > 
> > Fixes: f6f7ad323461 ("drm/atmel-hlcdc: allow selecting a higher pixel-clock than requested")
> The id is wrong here - the right one is: 9946a3a9dbedaaacef8b7e94f6ac144f1daaf1de
> The wrong id above was used before - so I think it is a copy'n'paste
> thing.
> 
> Hint: try "dim fixes 9946a3a9dbedaaacef8b7e94f6ac144f1daaf1de"
> 
> If I get a quick response from Lee I can fix it up while applying.
> 
> 	Sam
> 
> > Reported-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> > Tested-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> > Signed-off-by: Peter Rosin <peda@...ntia.se>

One other detail.
The patch has passed through your hands, so you have to add your s-o-b
to document this.
The chain of s-o-b shall document the path the patch has taken towards
the kernel.

In this case:
Peter => Claudiu => Sam => Applied.

Please resend or reply where you say OK that I add your s-o-b.

PS. And happy new year!

	Sam

> > ---
> >  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > index 721fa88bf71d..10985134ce0b 100644
> > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > @@ -121,8 +121,8 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
> >  		int div_low = prate / mode_rate;
> >  
> >  		if (div_low >= 2 &&
> > -		    ((prate / div_low - mode_rate) <
> > -		     10 * (mode_rate - prate / div)))
> > +		    (10 * (prate / div_low - mode_rate) <
> > +		     (mode_rate - prate / div)))
> >  			/*
> >  			 * At least 10 times better when using a higher
> >  			 * frequency than requested, instead of a lower.
> > -- 
> > 2.7.4
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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