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authorChuanhong Guo <[email protected]>2020-02-08 15:43:50 +0800
committerMiquel Raynal <[email protected]>2020-03-09 14:50:19 +0100
commitf1541773af49ecd1edae29c8ac0775253a0b0760 (patch)
tree7897b74fec508b5f82e994ef5fc003a4ecf3834c /drivers/usb/cdns3/cdns3-debug.h
parenta91f8170df832967dc75d5bd594c496999882e22 (diff)
mtd: spinand: rework detect procedure for different READ_ID operation
Currently there are 3 different variants of read_id implementation: 1. opcode only. Found in GD5FxGQ4xF. 2. opcode + 1 addr byte. Found in GD5GxGQ4xA/E 3. opcode + 1 dummy byte. Found in other currently supported chips. Original implementation was for variant 1 and let detect function of chips with variant 2 and 3 to ignore the first byte. This isn't robust: 1. For chips of variant 2, if SPI master doesn't keep MOSI low during read, chip will get a random id offset, and the entire id buffer will shift by that offset, causing detect failure. 2. For chips of variant 1, if it happens to get a devid that equals to manufacture id of variant 2 or 3 chips, it'll get incorrectly detected. This patch reworks detect procedure to address problems above. New logic do detection for all variants separatedly, in 1-2-3 order. Since all current detect methods do exactly the same id matching procedure, unify them into core.c and remove detect method from manufacture_ops. Tested on GD5F1GQ4UAYIG and W25N01GVZEIG. Signed-off-by: Chuanhong Guo <[email protected]> Signed-off-by: Miquel Raynal <[email protected]> Link: https://lore.kernel.org/linux-mtd/[email protected]
Diffstat (limited to 'drivers/usb/cdns3/cdns3-debug.h')
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