Hi Francesco, On Sat, Jan 3, 2026 at 6:22 PM Francesco Valla <[email protected]> wrote: > > One of the two on-board PTN5110 TCPC USB Power Delivery controller on > the i.MX93 FRDM board shares its interrupt line whith the PCAL6524 power > controller (GPIO3-27). Since the PTN5110 starts after POR with the > interrupts enabled, this can lead to an interrupt storm on OS startup if > only the driver for the PCAL6524 is loaded, because none is servicing > (and clearing) the interrupt requests from the PTN5110. > > Maks and clear all interrupts as part uring board initialization; they > can be re-enabled later by a proper OS driver if required. > > Co-developed-by: Joseph Guo <[email protected]> > Signed-off-by: Francesco Valla <[email protected]> > --- > Interrupt storms have been observed during the Linux kernel startup on > the i.MX93 FRDM [0], leading to the IRQ functionality being disabled for > the involved IRQ line. Even in case the IRQ line is not disabled, > several thousands of interrupts can be observed: > > 94: 55749 0 gpio-vf610 27 Level 1-0022, 2-0050 > > This has been traced to the interrupt sharing for one of the on-board > PTN5110 TCPC and the PCAL6524 I/O expander. The same behavior was > observed and fixed on the i.MX91 FRDM [1], so the proposed solution > is the same: to mask and clear all PTN5110 interrupts during board > configuration. > > With this patch applied, the interrupt line is completely silent on > startup: > > 94: 0 0 gpio-vf610 27 Level 1-0022, 2-0050 > > I added the Co-developed-by tag giving credit to Joseph Guo since the > technical solution is theirs, as developed for the i.MX91 FRDM. > > [0] https://lore.kernel.org/all/20251230171548.67289601@windsurf > [1] > https://lore.kernel.org/all/[email protected]
Thanks for your patch. Reviewed-by: Fabio Estevam <[email protected]> It would be nice if Thomas could confirm that this fixes the issue he reported. Thanks
