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i.MX6DL: Why MMDC_CH1 handshake can be bypassed when enter low power mode

Question asked by p p on Sep 7, 2016
Latest reply on Sep 12, 2016 by p p

Before entering low power mode, CCM_CLPCR bit 21 (bypass_mmdc_ch1_lpm_hs) is set to bypass MMDC_CH1 handshake. The code can be found in function imx6_set_lpm() at file arch/arm/mach-imx/pm-imx6.c in imx_3.10.53_1.1.0_ga release. I have 2 questions here:

 

1. Why MMDC_CH1 handshake can be bypassed when entering low power mode and don't wait for MMDC_CH1 handshake?

 

2. Why we didn't bypass MMDC_CH0 handshake in the same code as well?

 

Thanks for your kind attention.

 

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