On Thu, Feb 17, 2022 at 05:00:37PM +0300, Dmitry Osipenko wrote: > 17.02.2022 11:29, Sascha Hauer пишет: > > From: Douglas Anderson <dianders@xxxxxxxxxxxx> > > > > Jitter was improved by lowering the MPLL bandwidth to account for high > > frequency noise in the rk3288 PLL. In each case MPLL bandwidth was > > lowered only enough to get us a comfortable margin. We believe that > > lowering the bandwidth like this is safe given sufficient testing. > > There are no device-trees that use "rockchip,rk3288-cru", AFAICS.. What do you mean? In my tree I have: arch/arm/boot/dts/rk3288.dtsi:863: compatible = "rockchip,rk3288-cru"; drivers/clk/rockchip/clk-rk3288.c:985:CLK_OF_DECLARE(rk3288_cru, "rockchip,rk3288-cru", rk3288_clk_init); > > Was this change tested on a non-RK3288 devices? Yes, on a rk3568 ;) The patch has been posted back in 2015 and was added to the Rockchip downstream kernel in 2016. I don't know how thoroughly Rockchip tests their kernels, but I assume the patch wouldn't be there if it caused any problems. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
