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

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[ Upstream commit ceeda328ed ]

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: 1406234105 ("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>
This commit is contained in:
Pratyush Yadav
2020-12-23 00:14:20 +05:30
committed by Chris
parent 05c85a8c77
commit e1d89fedad
1 changed files with 1 additions and 1 deletions
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2
drivers/mtd/spi-nor/cadence-quadspi.c
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@@ -461,7 +461,7 @@ static int cqspi_indirect_read_setup(struct spi_nor *nor,
/* Setup dummy clock cycles */
dummy_clk = nor->read_dummy;
if (dummy_clk > CQSPI_DUMMY_CLKS_MAX)
dummy_clk = CQSPI_DUMMY_CLKS_MAX;
return -EOPNOTSUPP;
if (dummy_clk / 8) {
reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);