Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH] cpufreq: imx6q: Fix imx6sx low frequency support | Date | Thu, 31 Aug 2017 01:31:38 +0200 |
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On Monday, August 28, 2017 2:07:51 PM CEST Lucas Stach wrote: > Am Montag, den 28.08.2017, 14:05 +0300 schrieb Leonard Crestez: > > This patch contains the minimal changes required to support imx6sx OPP > > of 198 Mhz. Without this patch cpufreq still reports success but the > > frequency is not changed, the "arm" clock will still be at 396000000 in > > clk_summary. > > > > In order to do this PLL1 needs to be still kept enabled while changing > > the ARM clock. This is a hardware requirement: when ARM_PODF is changed > > in CCM we need to check the busy bit of CCM_CDHIPR bit 16 arm_podf_busy, > > and this bit is sync with PLL1 clock, so if PLL1 NOT enabled, this > > bit will never get clear. > > > > Keep pll1_sys explicitly enabled until after the rate is change to deal > > with this. Otherwise from the clk framework perspective pll1_sys is > > unused and gets turned off. > > > > Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> > > Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Patch applied, thanks!
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