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SubjectRe: [PATCH 1/1] cpufreq: imx6q: imx6ull: use PLL1 for frequency higher than 528MHz
On 28-07-17, 10:36, Sébastien Szymanski wrote:
> Setting the frequency higher than 528Mhz actually sets the ARM
> clock to 528MHz. That's because PLL2 is used as the root clock when the
> frequency is higher than 396MHz.
>
> cpupower frequency-set -f 792000
>
> arm_clk_root on the CCM_CLKO2 signal is 528MHz instead of 792MHz.
>
> [ 61.606383] cpu cpu0: 396 MHz, 1025 mV --> 792 MHz, 1225 mV
>
> pll2 1 1 528000000 0 0
> pll2_bypass 1 1 528000000 0 0
> pll2_bus 3 3 528000000 0 0
> ca7_secondary_sel 1 1 528000000 0 0
> step 1 1 528000000 0 0
> pll1_sw 1 1 528000000 0 0
> arm 1 1 528000000 0 0
>
> Fixes this by using the PLL1 as the root clock when the frequency is
> higher than 528MHz.
>
> cpupower frequency-set -f 792000
>
> arm_clk_root on the CCM_CLKO2 signal is now 792MHz as expected.
>
> [ 69.717987] cpu cpu0: 198 MHz, 950 mV --> 792 MHz, 1225 mV
>
> pll1 1 1 792000000 0 0
> pll1_bypass 1 1 792000000 0 0
> pll1_sys 1 1 792000000 0 0
> pll1_sw 1 1 792000000 0 0
> arm 1 1 792000000 0 0
>
> Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
> ---
> drivers/cpufreq/imx6q-cpufreq.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)

Looks fine to me:

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

@Shawn: Can you also confirm if this looks fine to you ?

--
viresh

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