Am Montag, dem 14.02.2022 um 16:44 +0000 schrieb Jonas Mark (BT-FIR/ENG1-Grb):
> Hi,
>
> > From: Leo Ruan <tingquan.ruan@xxxxxxxxxxxx>
> >
> > 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@xxxxxxxxxxxx>
> > Signed-off-by: Mark Jonas <mark.jonas@xxxxxxxxxxxx>
> > ---
> > 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
