Switching off 100 MHz Oscillator in "Suspend-to-RAM" mode on the qmmek board

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Switching off 100 MHz Oscillator in "Suspend-to-RAM" mode on the qmmek board

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Ziegfried
Contributor I

Hello, NXP's team

I'm using the qmmek board with processor imx8qm. For saving energy in the suspend mode I want to switch off PCIe 100MHz OSCILLATOR(DSC557-04444KI1-T). By default it's not powered off in the suspend mode. Pins A25 and A17 are configured as SC_P_PCIE_CTRL1_CLKREQ_B_HSIO_PCIE1_CLKREQ_B and SC_P_PCIE_CTRL0_CLKREQ_B_HSIO_PCIE0_CLKREQ_B respectively.Should I configure A25 and A 17 as GPIO? Should I change code in SCFW?

Ziegfried_0-1684142284450.png

Thank you!

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Dhruvit
NXP TechSupport
NXP TechSupport

Hi @Ziegfried,

I hope you are doing well.

Please find the answer below.
 
Q. Should I configure A25 and A17 as GPIO? Should I change code in SCFW?
=> One needs to modify the SCFW. As it is mentioned in the imx_reference_manual,
"The i.MX 8QuadMax/8QuadXPlus does not have hardware low power modes. All the low-power modes are implemented in SCFW using the software method."
 
Thanks & Regards,
Dhruvit Vasavada
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