linux-kernel - Re: [PATCH] gpu: ipu-v3: Fix dev

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Message-ID: <65a7fdadc60d0c76138a8979a0c6fe1d6cdeb85d.camel@pengutronix.de>
Date:   Mon, 14 Feb 2022 18:24:01 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     "Jonas Mark (BT-FIR/ENG1-Grb)" <Mark.Jonas@...bosch.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     "RUAN Tingquan (BT-FIR/ENG1-Zhu)" <Tingquan.Ruan@...bosch.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] gpu: ipu-v3: Fix dev_dbg frequency output

Am Montag, dem 14.02.2022 um 16:44 +0000 schrieb Jonas Mark (BT-FIR/ENG1-Grb):
> Hi,
> 
> > From: Leo Ruan <tingquan.ruan@...bosch.com>
> > 
> > This commit corrects the printing of the IPU clock error percentage if it is
> > between -0.1% to -0.9%. For example, if the pixel clock requested is 27.2
> > MHz but only 27.0 MHz can be achieved the deviation is -0.8%.
> > But the fixed point math had a flaw and calculated error of 0.2%.
> > 
> > Before:
> >   Clocks: IPU 270000000Hz DI 24716667Hz Needed 27200000Hz
> >   IPU clock can give 27000000 with divider 10, error 0.2%
> >   Want 27200000Hz IPU 270000000Hz DI 24716667Hz using IPU,
> > 27000000Hz
> > 
> > After:
> >   Clocks: IPU 270000000Hz DI 24716667Hz Needed 27200000Hz
> >   IPU clock can give 27000000 with divider 10, error -0.8%
> >   Want 27200000Hz IPU 270000000Hz DI 24716667Hz using IPU,
> > 27000000Hz
> > 
> > Signed-off-by: Leo Ruan <tingquan.ruan@...bosch.com>
> > Signed-off-by: Mark Jonas <mark.jonas@...bosch.com>
> > ---
> >  drivers/gpu/ipu-v3/ipu-di.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/ipu-v3/ipu-di.c b/drivers/gpu/ipu-v3/ipu-di.c index
> > b4a31d506fcc..74eca68891ad 100644
> > --- a/drivers/gpu/ipu-v3/ipu-di.c
> > +++ b/drivers/gpu/ipu-v3/ipu-di.c
> > @@ -451,8 +451,9 @@ static void ipu_di_config_clock(struct ipu_di *di,
> > 
> >  		error = rate / (sig->mode.pixelclock / 1000);
> > 
> > -		dev_dbg(di->ipu->dev, "  IPU clock can give %lu with divider
> > %u, error %d.%u%%\n",
> > -			rate, div, (signed)(error - 1000) / 10, error % 10);
> > +		dev_dbg(di->ipu->dev, "  IPU clock can give %lu with divider
> > %u, error %c%d.%d%%\n",
> > +			rate, div, error < 1000 ? '-' : '+',
> > +			abs(error - 1000) / 10, abs(error - 1000) % 10);
> > 
> >  		/* Allow a 1% error */
> >  		if (error < 1010 && error >= 990) {
> 
> Is there anything I can do to help getting this patch mainline?

Philipp is still on vacation, but will be back in a few days. I guess
he will take a look at those patches then.

Regards,
Lucas