On Fri, May 09, 2025 at 04:18:28PM +0200, Francesco Dolcini wrote:
From: Emanuele Ghidoli emanuele.ghidoli@toradex.com
If an input changes state during wake-up and is used as an interrupt source, the IRQ handler reads the volatile input register to clear the interrupt mask and deassert the IRQ line. However, the IRQ handler is triggered before access to the register is granted, causing the read operation to fail.
As a result, the IRQ handler enters a loop, repeatedly printing the "failed reading register" message, until `pca953x_resume` is eventually
`pca953x_resume` --> pca953x_resume()
called, which restores the driver context and enables access to registers.
Fix by disabling the IRQ line before entering suspend mode, and re-enabling it after the driver context is restored in `pca953x_resume`.
`pca953x_resume` --> pca953x_resume()
An irq can be disabled with disable_irq() and still wake the system as
IRQ
long as the irq has wake enabled, so the wake-up functionality is
IRQ
preserved.
With above fixed, Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com thanks!