| Message ID | 20210728135534.703028-8-pgwipeout@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | fixes and enablement for rk356x | expand |
Hi Peter, Am Mittwoch, 28. Juli 2021, 15:55:32 CEST schrieb Peter Geis: > The rk3568 gpll should run at 1200mhz and the ppll should run at 200mhz. > These are set incorrectly by the bootloader, so fix them here. Can you specify where the "should run at" comes from? Normally I'd assume setting desired PLL frequencies would be quite board-specific. So if we're setting defaults for all boards, I'd like some reasoning behind that ;-) ... especially when the other option would be to fix the bootloader. Thanks Heiko > > Signed-off-by: Peter Geis <pgwipeout@gmail.com> > --- > arch/arm64/boot/dts/rockchip/rk356x.dtsi | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm64/boot/dts/rockchip/rk356x.dtsi b/arch/arm64/boot/dts/rockchip/rk356x.dtsi > index 8ba0516eedd8..91ae3c541c1a 100644 > --- a/arch/arm64/boot/dts/rockchip/rk356x.dtsi > +++ b/arch/arm64/boot/dts/rockchip/rk356x.dtsi > @@ -230,6 +230,8 @@ cru: clock-controller@fdd20000 { > rockchip,grf = <&grf>; > #clock-cells = <1>; > #reset-cells = <1>; > + assigned-clocks = <&cru PLL_GPLL>, <&pmucru PLL_PPLL>; > + assigned-clock-rates = <1200000000>, <200000000>; > }; > > i2c0: i2c@fdd40000 { >
On Wed, Jul 28, 2021 at 10:09 AM Heiko Stübner <heiko@sntech.de> wrote: > > Hi Peter, > > Am Mittwoch, 28. Juli 2021, 15:55:32 CEST schrieb Peter Geis: > > The rk3568 gpll should run at 1200mhz and the ppll should run at 200mhz. > > These are set incorrectly by the bootloader, so fix them here. > > Can you specify where the "should run at" comes from? > Normally I'd assume setting desired PLL frequencies would be quite > board-specific. gpll boots at 1188mhz, but to get accurate dividers for all gpll_dividers it needs to run at 1200mhz, otherwise everyone downstream isn't quite right. ppll feeds the combophys, which has a divide by 2 clock, so 200mhz is required to reach a 100mhz clock input for them. Downstream also makes this fix. rk356x has a number of dividers that produce expected clock values for various peripherals, so changing the defaults would mean reclocking a number of child dividers. > > So if we're setting defaults for all boards, I'd like some reasoning > behind that ;-) ... especially when the other option would be to > fix the bootloader. Currently we are forced to use downstream u-boot (mainline isn't ready yet). Downstream doesn't seem to want to assign clocks correctly, so the simplest method right now is to have the kernel ensure they are correct. > > Thanks > Heiko > > > > > Signed-off-by: Peter Geis <pgwipeout@gmail.com> > > --- > > arch/arm64/boot/dts/rockchip/rk356x.dtsi | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/arch/arm64/boot/dts/rockchip/rk356x.dtsi b/arch/arm64/boot/dts/rockchip/rk356x.dtsi > > index 8ba0516eedd8..91ae3c541c1a 100644 > > --- a/arch/arm64/boot/dts/rockchip/rk356x.dtsi > > +++ b/arch/arm64/boot/dts/rockchip/rk356x.dtsi > > @@ -230,6 +230,8 @@ cru: clock-controller@fdd20000 { > > rockchip,grf = <&grf>; > > #clock-cells = <1>; > > #reset-cells = <1>; > > + assigned-clocks = <&cru PLL_GPLL>, <&pmucru PLL_PPLL>; > > + assigned-clock-rates = <1200000000>, <200000000>; > > }; > > > > i2c0: i2c@fdd40000 { > > > > > >
diff --git a/arch/arm64/boot/dts/rockchip/rk356x.dtsi b/arch/arm64/boot/dts/rockchip/rk356x.dtsi index 8ba0516eedd8..91ae3c541c1a 100644 --- a/arch/arm64/boot/dts/rockchip/rk356x.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk356x.dtsi @@ -230,6 +230,8 @@ cru: clock-controller@fdd20000 { rockchip,grf = <&grf>; #clock-cells = <1>; #reset-cells = <1>; + assigned-clocks = <&cru PLL_GPLL>, <&pmucru PLL_PPLL>; + assigned-clock-rates = <1200000000>, <200000000>; }; i2c0: i2c@fdd40000 {
The rk3568 gpll should run at 1200mhz and the ppll should run at 200mhz. These are set incorrectly by the bootloader, so fix them here. Signed-off-by: Peter Geis <pgwipeout@gmail.com> --- arch/arm64/boot/dts/rockchip/rk356x.dtsi | 2 ++ 1 file changed, 2 insertions(+)