[PATCH v3 00/14] spi: airoha: driver fixes & improvements

[Mikhail Kshevetskiy]

This patch series greatly improve airoha snfi driver and fix a
number of serious bug.

Fixed bugs:
 * Fix reading/writing of flashes with more than one plane per lun
 * Fix inability to read/write oob area
 * Fill the buffer with 0xff before writing
 * Fix reading of flashes supporting continuous reading mode
 * Fix error paths

Improvements:
 * Add support of dual/quad wires spi modes in exec_op().
 * Support of dualio/quadio flash reading commands
 * Remove dirty hack that reads flash page settings from SNFI registers
   during driver startup

Unfortunately I am unable to test the driver with linux at the moment,
so only the following testing was done:
 * Driver compiles without error.
 * All changes were tested with corresponding u-boot driver. U-Boot
   SpiNAND driver was modified as well to match linux-6.17-rc2 with
   additional fixes for continuous mode.

Changes v2:
 * minor fix
 * add comments to code

Changes v3:
 * add patch to prevent continuous reading

Mikhail Kshevetskiy (14):
  spi: airoha: return an error for continuous mode dirmap creation cases
  spi: airoha: remove unnecessary restriction length
  spi: airoha: add support of dual/quad wires spi modes
  spi: airoha: remove unnecessary switch to non-dma mode
  spi: airoha: unify dirmap read/write code
  spi: airoha: switch back to non-dma mode in the case of error
  spi: airoha: fix reading/writing of flashes with more than one plane
    per lun
  spi: airoha: support of dualio/quadio flash reading commands
  spi: airoha: allow reading/writing of oob area
  spi: airoha: buffer must be 0xff-ed before writing
  spi: airoha: avoid setting of page/oob sizes in REG_SPI_NFI_PAGEFMT
  spi: airoha: reduce the number of modification of REG_SPI_NFI_CNFG and
    REG_SPI_NFI_SECCUS_SIZE registers
  spi: airoha: set custom sector size equal to flash page size
  spi: airoha: avoid reading flash page settings from SNFI registers
    during driver startup

 drivers/spi/spi-airoha-snfi.c | 508 +++++++++++++++++-----------------
 1 file changed, 260 insertions(+), 248 deletions(-)

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2.50.1