spi: stm32-qspi: Increase read throughput in indirect mode

When WATCHDOG_RESET() was replaced by schedule() in commit
29caf9305b6f ("cyclic: Use schedule() instead of WATCHDOG_RESET()")
we not only reset the watchdog but also call the cyclic infrastructure
which takes time and has impact on read accesses performances.

Move schedule() from _stm32_qspi_read_fifo() to _stm32_qspi_poll()
and call schedule() only every 1MB chunk of data.

Test performed by reading 64MB on sNOR on stm32mp157c-ev1 board:

          before      after    ratio
Read  :  201 KB/s    520KB/s   +258%

Reviewed-by: Patrick Delaunay <[email protected]>
Signed-off-by: Patrice Chotard <[email protected]>

0 files changed, 0 insertions, 0 deletions