tree 4c2545f0bd104b400d5cd4e03467917127a37515
parent 4ed995b914350a3c948cca1bc68f5e301aafd75f
author Pratyush Yadav <p.yadav@ti.com> 1608662660 +0530
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1614792164 +0100

spi: cadence-quadspi: Abort read if dummy cycles required are too many

[ Upstream commit ceeda328edeeeeac7579e9dbf0610785a3b83d39 ]

The controller can only support up to 31 dummy cycles. If the command
requires more it falls back to using 31. This command is likely to fail
because the correct number of cycles are not waited upon. Rather than
silently issuing an incorrect command, fail loudly so the caller can get
a chance to find out the command can't be supported by the controller.

Fixes: 140623410536 ("mtd: spi-nor: Add driver for Cadence Quad SPI Flash Controller")
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20201222184425.7028-3-p.yadav@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>