spi: bcm-qspi: fix MSPI only access with bcm_qspi_exec_mem_op()

stable inclusion
from stable-v5.10.111
commit 6c17f4ef3c4f662865ac99ad167a8b896ca70d2f
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GL1Z

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6c17f4ef3c4f662865ac99ad167a8b896ca70d2f



--------------------------------

[ Upstream commit 2c7d1b28 ]

This fixes case where MSPI controller is used to access spi-nor
flash and BSPI block is not present.

Fixes: 5f195ee7 ("spi: bcm-qspi: Implement the spi_mem interface")
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20220328142442.7553-1-kdasu.kdev@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>