On 02/19/2019 09:36 AM, Vignesh R (by way of Boris Brezillon <bbrezillon@xxxxxxxxxx>) wrote: > HyperFlash devices are compliant with CFI AMD/Fujitsu Extended Command > Set(0x0002) for flash operations, therefore drivers/mtd/chips/cfi_cmdset_0002.c > can be use as is. But these devices do not support DQ polling method of > determining chip ready/good status. These flashes provide Status > Register whose bits can be polled to know status of flash operation. > > Cypress HyperFlash datasheet here[1], talks about CFI Amd/Fujitsu > Extended Query version 1.5. Bit 0 of "Software Features supported" field > of CFI Primary Vendor-Specific Extended Query table indicates > presence/absence of status register and Bit 1 indicates whether or not > DQ polling is supported. Using these bits, its possible to determine > whether flash supports DQ polling or need to use Status Register. > > Add support for polling status register to know device ready/status of > erase/write operations when DQ polling is not supported. > > [1] https://www.cypress.com/file/213346/download > > Signed-off-by: Vignesh R <vigneshr@xxxxxx> Forgot about one thing: tags like S-o-b: need your full name, cfr. Documentation/process/5.Posting.rst... [...] MBR, Sergei
