From: Pratyush Yadav p.yadav@ti.com
[ 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 --- drivers/mtd/spi-nor/cadence-quadspi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c index 7bef63947b29f..97a5e1eaeefdf 100644 --- a/drivers/mtd/spi-nor/cadence-quadspi.c +++ b/drivers/mtd/spi-nor/cadence-quadspi.c @@ -475,7 +475,7 @@ static int cqspi_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);