From: Jagan Teki <jagan@amarulasolutions.com>
To: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Chen-Yu Tsai <wens@csie.org>, Icenowy Zheng <icenowy@aosc.io>,
Jernej Skrabec <jernej.skrabec@siol.net>,
Vasily Khoruzhick <anarsoul@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
David Airlie <airlied@linux.ie>,
dri-devel <dri-devel@lists.freedesktop.org>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>,
linux-clk <linux-clk@vger.kernel.org>,
Michael Trimarchi <michael@amarulasolutions.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
devicetree <devicetree@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-sunxi@googlegroups.com
Subject: Re: [PATCH v2 02/15] clk: sunxi-ng: Add check for minimal rate to NKM PLLs
Date: Thu, 25 Oct 2018 16:25:59 +0530 [thread overview]
Message-ID: <CAMty3ZC2wn-DjR+93yc-n-bAmVCHaEqR_=4XPddoo+7LjebTEg@mail.gmail.com> (raw)
In-Reply-To: <20181024180436.5n3i3z6h2yezc4cv@flea>
On Wed, Oct 24, 2018 at 11:34 PM Maxime Ripard
<maxime.ripard@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 <jagan@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.
>
> How did you test this?
I've not used this on PLL_MIPI atleast, so I didn't test this.
next prev parent reply other threads:[~2018-10-25 10:56 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-23 15:50 [PATCH v2 00/15] drm/sun4i: Allwinner A64 MIPI-DSI support Jagan Teki
2018-10-23 15:50 ` [PATCH v2 01/15] clk: sunxi-ng: a64: Fix gate bit of DSI DPHY Jagan Teki
2018-10-24 8:48 ` Stephen Boyd
2018-10-23 15:50 ` [PATCH v2 02/15] clk: sunxi-ng: Add check for minimal rate to NKM PLLs Jagan Teki
2018-10-24 8:48 ` Stephen Boyd
2018-10-24 18:04 ` Maxime Ripard
2018-10-25 10:55 ` Jagan Teki [this message]
2018-10-29 8:58 ` Maxime Ripard
2018-10-29 12:40 ` [linux-sunxi] " Jagan Teki
2018-11-05 10:11 ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 03/15] clk: sunxi-ng: Add check for maximum " Jagan Teki
2018-10-23 17:10 ` Vasily Khoruzhick
2018-10-24 8:48 ` Stephen Boyd
2018-10-23 15:50 ` [PATCH v2 04/15] drm/sun4i: sun6i_mipi_dsi: Add Allwinner A64 MIPI DSI support Jagan Teki
2018-10-24 18:06 ` Maxime Ripard
2018-10-25 11:02 ` Jagan Teki
2018-10-29 9:00 ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 05/15] dt-bindings: sun6i-dsi: Add compatible for A64 MIPI DSI Jagan Teki
2018-10-23 15:50 ` [PATCH v2 06/15] drm/sun4i: sun6i_mipi_dsi: Add DSI Generic short write 2 param transfer Jagan Teki
2018-10-23 15:50 ` [PATCH v2 07/15] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation Jagan Teki
2018-10-23 15:50 ` [PATCH v2 08/15] drm/sun4i: sun6i_mipi_dsi: Fix TCON DRQ set bits Jagan Teki
2018-10-23 15:50 ` [PATCH v2 09/15] drm/sun4i: sun6i_mipi_dsi: Refactor vertical video start delay Jagan Teki
2018-10-23 15:50 ` [PATCH v2 10/15] dt-bindings: panel: Add Bananapi S070WV20-CT16 ICN6211 MIPI-DSI to RGB bridge Jagan Teki
2018-10-24 18:07 ` Maxime Ripard
2018-10-24 20:36 ` Chen-Yu Tsai
2018-10-23 15:50 ` [PATCH v2 11/15] drm/panel: " Jagan Teki
2018-10-23 15:50 ` [PATCH v2 12/15] clk: sunxi-ng: a64: Add min and max rate for PLL_MIPI Jagan Teki
2018-10-24 8:49 ` Stephen Boyd
2018-10-24 18:13 ` Maxime Ripard
2018-10-25 15:51 ` Jagan Teki
2018-10-29 9:08 ` Maxime Ripard
2018-10-29 15:08 ` Jagan Teki
2018-11-05 12:42 ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 13/15] dt-bindings: sun6i-dsi: Add compatible for A64 DPHY Jagan Teki
2018-10-24 18:09 ` Maxime Ripard
2018-10-25 12:52 ` Jagan Teki
2018-10-29 9:01 ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 14/15] arm64: dts: allwinner: a64: Add DSI pipeline Jagan Teki
2018-10-24 18:10 ` Maxime Ripard
2018-10-25 13:21 ` Jagan Teki
2018-10-29 9:01 ` Maxime Ripard
2018-10-23 15:50 ` [PATCH v2 15/15] arm64: dts: allwinner: bananapi-m64: Bananapi S070WV20-CT16 DSI panel Jagan Teki
2018-10-24 18:11 ` Maxime Ripard
2018-10-24 20:36 ` Chen-Yu Tsai
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