Dear All,
I have known it is possible to change the VPU clock up to 352MHz by kernel menuconfig in i.MX6DQ.
When changing the VPU clock, what influence is there?
- Is only the operation clock of VPU changed?
- Is the voltage of internal LDO changed? (It need to change the voltage)
- Is setting changed into the others?
- Is there a demerit?
(For example, current consumption is increased. Do you have the data of current consumption at VPU:352MHz)
Best Regards,
Keita
Hi Keita
-Is only the operation clock of VPU changed?
yes
-- Is the voltage of internal LDO changed? (It need to change the voltage)
yes it changed according to datasheet
-- Is setting changed into the others?
no
-- Is there a demerit?
power consumption may be increased, some figures can be found
in AN4509 sect.3.7 Typical Max Power
Best regards
igor
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Dear Igor,
Hello. We had found the below impact.
When the user changed the VPU clock to 352 MHz by kernel menu config, PLL2_PFD2 from 396 MHz to 352 MHz, then the uSDHC1_CLK_ROOT~uSDHC4_CLK_ROOT and ARM core clock at stop mode had used PLL2_PFD2, too.
So, the user want to avoid this impact.
[Question]
Is it possible to change the VPU Clock into PLL2_PFD0? [PLL2_PFD2 --> PLL2_PFD0]
Is there some impact?
(We checked the PLL2_PFD0 is used for nowhere before the setting VPU=352 MHz.)
Best Regards,
Keita
Hi Keita
please create new thread, as this is new problem.
Also please provide additional data:
1. full part number of processor
2. full name of BSP (web link)
3. what board is used in the case: customer board or FSL reference board (full name)
Best regards
igor
Hi Igor,
OK. I created the new thread.
Thanks.
Best Regards,
Keita