On Thu, Oct 25, 2018 at 04:25:59PM +0530, Jagan Teki wrote:
> On Wed, Oct 24, 2018 at 11:34 PM Maxime Ripard
> <maxime.rip...@bootlin.com> wrote:
> >
> > On Tue, Oct 23, 2018 at 09:20:22PM +0530, Jagan Teki wrote:
> > > Some NKM PLLs doesn't work well when their output clock rate is set below
> > > certain rate.
> > >
> > > So, add support for minimal rate for relevant PLLs.
> > >
> > > Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
> > > ---
> > > Changes for v2:
> > > - new patch
> > >
> > > drivers/clk/sunxi-ng/ccu_nkm.c | 7 +++++++
> > > drivers/clk/sunxi-ng/ccu_nkm.h | 1 +
> > > 2 files changed, 8 insertions(+)
> > >
> > > diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c
> > > b/drivers/clk/sunxi-ng/ccu_nkm.c
> > > index 841840e35e61..d17539dc88dd 100644
> > > --- a/drivers/clk/sunxi-ng/ccu_nkm.c
> > > +++ b/drivers/clk/sunxi-ng/ccu_nkm.c
> > > @@ -125,6 +125,13 @@ static unsigned long ccu_nkm_round_rate(struct
> > > ccu_mux_internal *mux,
> > > if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
> > > rate *= nkm->fixed_post_div;
> > >
> > > + if (rate < nkm->min_rate) {
> > > + rate = nkm->min_rate;
> > > + if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
> > > + rate /= nkm->fixed_post_div;
> >
> > I'm not sure this is right. Is the post divider taken into account to
> > calculate the minimum, or is the minimum on the rate before the fixed
> > post divider.
>
> Since we are returning from here, we need to take care post div which
> is actually doing at the end of round_rate.That's not my point though. Does the rate needs to be superior to min / post_div, or min? > > > > How did you test this? > > I've not used this on PLL_MIPI atleast, so I didn't test this. If you've never tested this, why are you adding that code? Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
signature.asc
Description: PGP signature
_______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
