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On probe, the SPI NOR core will put a flash in 8D-8D-8D mode if it supports it. But Linux as of now expects to get the flash in 1S-1S-1S mode. Handing the flash to Linux in Octal DTR mode means the kernel will fail to detect the flash. So, we need to reset to Power-on-Reset (POR) state before handing off the flash. A Software Reset command can be used to do this. One limitation of the soft reset is that it will restore state from non-volatile registers in some flashes. This means that if the flash was set to 8D mode in a non-volatile configuration, a soft reset won't help. This commit assumes that we don't set any non-volatile bits anywhere, and the flash doesn't have any non-volatile Octal DTR mode configuration. Since spi-nor-tiny doesn't (and likely shouldn't) have spi_nor_soft_reset(), add a dummy spi_nor_remove() for it that does nothing. Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Jagan Teki <jagan@amarulasolutions.com> |
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| .. | ||
| bbm.h | ||
| cfi.h | ||
| concat.h | ||
| doc2000.h | ||
| flashchip.h | ||
| fsl_upm.h | ||
| fsmc_nand.h | ||
| mtd.h | ||
| nand.h | ||
| nand_bch.h | ||
| nand_ecc.h | ||
| ndfc.h | ||
| omap_elm.h | ||
| omap_gpmc.h | ||
| onenand.h | ||
| onenand_regs.h | ||
| partitions.h | ||
| rawnand.h | ||
| samsung_onenand.h | ||
| spi-nor.h | ||
| spinand.h | ||
| st_smi.h | ||
| ubi.h | ||