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The >>>>> standard arm64 defconfig enables the t194 pcie driver as a module. And >>>>> my simple busybox ramdisk that I use for mainline regression testing >>>>> isn't loading any modules. If I set the pcie driver to built-in, I >>>>> replicate the issue. And I don't see the issue on my normal use case, >>>>> because I have the dt changes as well. >>>>> >>>>> So it appears that the pcie driver submits icc bandwidth. And without >>>>> cpufreq submitting bandwidth as well, the emc driver gets a very low >>>>> number and thus sets a very low emc freq. The question becomes... what >>>>> to do about it? If the related dt changes were submitted to >>>>> linux-next, everything should fall into place. And I'm not sure where >>>>> this falls on the severity scale since it doesn't full out break boot >>>>> or prevent operation. >>>> >>>> Where are the related DT changes? If we can get these into -next and >>>> lined up to be merged for v6.19, then that is fine. However, we should >>>> not merge this for v6.19 without the DT changes. >>> >>> The dt changes are here [0]. >> >> To confirm, applying the DT changes do not fix this for me. Thierry is >> having a look at this to see if there is a way to fix this. >> >> BTW, I have also noticed that Thierry's memory frequency test [0] is >> also failing on Tegra186. The test simply tries to set the frequency via >> the sysfs and this is now failing. I am seeing ... >> >> memory: emc: - available rates: (* = current) >> memory: emc: - 40800000 >> memory: emc: - 68000000 >> memory: emc: - 102000000 >> memory: emc: - 204000000 >> memory: emc: - 408000000 >> memory: emc: - 665600000 >> memory: emc: - 800000000 >> memory: emc: - 1062400000 >> memory: emc: - 1331200000 >> memory: emc: - 1600000000 >> memory: emc: - 1866000000 * >> memory: emc: - testing: >> memory: emc: - 40800000...OSError: [Errno 34] Numerical result out >> of range > > Question. Does this test run and pass on jetson-tk1? I based the > tegra210 and tegra186 [0] code on tegra124 [1]. And I don't see a > difference in the flow now. What appears to be happening is that icc > is reporting a high bandwidth, setting the emc min_freq to something > like 1600MHz. Then debugfs is having max_freq set to something low > like 40.8MHz. Then the linked code block fails because the higher of > the min_freqs is greater than the lower of the max_freqs. But if this > same test is run on jetson-tk1, I don't see how it passes. Unless > maybe the t124 actmon is consistently setting min freqs during the > tests. So we don't currently run this test on Tegra124. We could certainly try. I don't recall if there was an issue that prevented us from doing so now. > An argument could be made that any attempt to set debugfs should win a > conflict with icc. That could be done. But if that needs done here, > I'd argue that it needs replicated across all other applicable emc > drivers too. The bottom line is that we cannot regress anything that was working before. Jon -- nvpublic