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We do not need to busy wait during mpi_init_check() since it is not being
invoked in atomic context. mpi_init_check() is being called from
pm8001_pci_resume(), pm8001_pci_probe(). Hence we are replacing udelay with
msleep.

Link: https://lore.kernel.org/r/20210109123849.17098-2-Viswas.G@microchip.com

Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: akshatzen <akshatzen@google.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Ruksar Devadi <Ruksar.devadi@microchip.com>
Signed-off-by: Radha Ramachandran <radha@google.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>