drivers/spi: fsl_qspi: fix read timeout
During QSPI reads, current is_controller_busy function sporadically fails with -ETIMEDOUT due to fixed number of 5 test loops. Using timer functions to wait 1000 us instead will fix this. Signed-off-by: NThomas Schaefer <thomas.schaefer@kontron.com> Reviewed-by: NFabio Estevam <festevam@gmail.com> Reviewed-by: NJagan Teki <jagan@amarulasolutions.com>
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