Re: Linux Kernel 6.6.36 and upstream mhi repo latest: Interface definition of sierra_em919x

["manivannan.sadhasivam" <manivannan.sadhasivam@linaro.org>]

On Sat, Jul 13, 2024 at 09:33:17AM +0000, Johannes Fischer wrote:
> Hi all,
> @Stark,
> first, I accept that changes may have side impact on other modems.
> Please have in mind that I flashed SWIX55C_03.14.10.04 and the respective generic nvu a few days ago, so I assume to be quite close to default config.
> 
> Using the sierra_em919x config with IP links changed to MBIM in kernel I can establish data traffic; I do not see a component converting the MBIM stream to RMnet in Linux kernel (?). I wonder whether there is positive confirmation about a EM919x working in PCIe mode with the current kernel config, in which mode? (We did not have trouble using the EM919x in USB mode.)
> 
> About GPIO handling, as said there is none for for Full_Card_Power_off# (6, 10k pull-up to 3V3) and RESET# (67, just a C=100nF to GND) on the BPI-R4.
> We have not validated the timing in BPI-R4 with 6.6.36 or current kernel versus the timing diagram at "AirPrime EM919X/EM7690 Product Technical Specification". As you said there may be a corner case that we end up with the Foxconn config due to timing at BPI-R4 power up times.
> 
> I get from your statement, that the valid config should be sierra_em919x, thanks for this clarification.
> 
> @Mani,
> for my understanding: I would be only able to get a MBIM type channel if the channel is configured for IP_HW0_MBIM. If it is configured for IP_HW0 only than it would be plain IP traffic like RMnet. Is this understanding right? - Thanks
> 

Correct.

- Mani

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