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On graceful power-down/disable transition, when an MHI reset is performed, the MHI device loses its context, including interrupt configuration. However, the current implementation is waiting for event(irq) driven state change to confirm reset has been completed, which never happens, and causes reset timeout, leading to unexpected high latency of the mhi_power_down procedure (up to 45 seconds). Fix that by moving to the recently introduced poll_reg_field method, waiting for the reset bit to be cleared, in the same way as the power_on procedure. Cc: stable@vger.kernel.org Fixes: a6e2e3522f29 ("bus: mhi: core: Add support for PM state transitions") Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Reviewed-by: Bhaumik Bhatt <bbhatt@codeaurora.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Reviewed-by: Hemant Kumar <hemantk@codeaurora.org> Link: https://lore.kernel.org/r/1620029090-8975-1-git-send-email-loic.poulain@linaro.org Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Link: https://lore.kernel.org/r/20210621161616.77524-3-manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>