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Spansion and Winbond have occasionally used the same manufacturer ID, and they don't support the same features. Particularly, writing SR=0 seems to break read access for Spansion's s25fl064k. Unfortunately, we don't currently have a way to differentiate these Spansion and Winbond parts, so rather than regressing support for these Spansion flash, let's drop the new Winbond lock/unlock support for now. We can try to address Winbond support during the next release cycle. Original discussion: http://patchwork.ozlabs.org/patch/549173/ http://patchwork.ozlabs.org/patch/553683/ Fixes:357ca38d47("mtd: spi-nor: support lock/unlock/is_locked for Winbond") Fixes:c6fc2171b2("mtd: spi-nor: disable protection for Winbond flash at startup") Signed-off-by: Brian Norris <computersforpeace@gmail.com> Reported-by: Felix Fietkau <nbd@openwrt.org> Cc: Felix Fietkau <nbd@openwrt.org>