[U-Boot] [BUG] SPI NOR for SST25V hangs for TI AM335x.

[Gautam Bhat]

Hi,

There is a bug in the SST25V SPI NOR for the TI AM335x. On a write the
SPI NOR hangs. This is because of the spi_release_bus(..) in the
spi_flash_read_common call done by spi_flash_sr_ready(..) called in
the spi_flash_wait_till_ready(..) in sst_write_wp(..). This call
clears all the registers and the setting associated with it and then
calls the spi_flash_cmd_write_disable in sst_write_wp(..) with the
wrong SPI settings.

Also there are spi_reset(..) calls happening in the sst_write_wp(..)
which seems to be unnecessary when the data sheet does not mention any
need for resets. Calling unnecessary resets simply increases the
latency in the driver and causes more bugs.

Currently commenting out the spi_release_bus(..) makes a successful write.

Thanks,
Gautam.