About SKris

SKris · 2022-08-18

Currently our custom board powers up in two cases, one when you press the power on button, and another when you plug in the USB cable. We would like to disable PMIC from powering on when USB cable is plugged in. We see that the STPMIC specification d...

SKris · 2022-08-15

When we tried the shutdown command ( shutdown -hP now ) from the debug console, all the PMIC regulators are turned off, except for the BUCK3 VDD regulator used for IO.Both our custom board which uses STPMIC1E and the STM32MP157F-eval board which has ...

SKris · 2022-07-18

We are having issues getting USB to work as both ethernet and gadget serial.In kernel configuration, We have the CONFIG_USB_ETH configured as inbuilt and CONFIG_USB_G_SERIAL as inbuilt as shown below. ## USB Gadget precomposed configurations#CONFIG_U...

SKris · 2022-05-03

We are doing a custom board bring-up and currently trying to display video on our display device. We use CubeMx to generate the device trees for our project, we have configured the DSI PLL dividers to match our display device requirement. Snapshot of...

SKris · 2022-02-03

We are trying to bring-up our custom board and every step of the way we see panic messages, we need some direction in understanding what went wrong. Our board has the following:Processor: STM32MP157FACxQSPI NAND flash memory is our boot device (AS5F1...

SKris · 2022-08-16

Hi Olivier,Sorry for getting back late. I had the FIFO changes in my device tree already, yet it did not make any difference. I also tried the solution mentioned for USB reconnecting issue, it was not helping with the issue either. Thanks,Shalini

SKris · 2022-08-16

Hi Kevin,Thanks a lot for sharing the link. The suggested changes to the tf-a device tree worked for us, now we see the buck3 being turned off when shutdown command is executed.Thanks,Shalini

SKris · 2022-06-22

Hi Gregory,Thanks for getting back. Through some experiments, we resolved the clock issue.We observed that the issue where, the measured DSI lane clock was 200MHz instead of 174MHz was linked to the video mode we used.Our display does not support non...

SKris · 2022-05-09

We understand this math. The effective rate must correlate with number of data lanes used by MIPI. In our case we use two data lanes, which means 692.88 / 4 = 173.22 which is the dsi data lane clock.Right now when we measure that clock we see 200Mhz ...

SKris · 2022-05-09

The DSI pixel clock is @28.87MHz which is lesser than lane byte clock.The issue we have here is that with the dividers matching the snapshot above we see a 200Mhz clock instead of a 174MHz clock on the DSI clock lane in the Oscilloscope.Any idea why ...

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User Activity

How to disable PMIC from powering up when USB cable is inserted.

When issuing the shutdown command the BUCK3 VDD regulator used for IO is not turned off.

Issues trying to configure USB as both ethernet and gadget serial

DSI PLL clock configurations in Device tree

Panic during custom board bring-up

Re: Issues trying to configure USB as both ethernet and gadget serial

Re: When issuing the shutdown command the BUCK3 VDD regulator used for IO is not turned off.

Re: DSI PLL clock configurations in Device tree

Re: DSI PLL clock configurations in Device tree

Re: DSI PLL clock configurations in Device tree