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3 Commits

Author SHA1 Message Date
Luis Alberto Herrera
e93a977367 mtd: revert "spi-nor: intel: provide a range for poll_timout" 
This change reverts aba3a882a178: "mtd: spi-nor: intel: provide a range
for poll_timout". That change introduces a performance regression when
reading sequentially from flash. Logging calls to intel_spi_read without
this change we get:

Start MTD read
[   20.045527] intel_spi_read(from=1800000, len=400000)
[   20.045527] intel_spi_read(from=1800000, len=400000)
[  282.199274] intel_spi_read(from=1c00000, len=400000)
[  282.199274] intel_spi_read(from=1c00000, len=400000)
[  544.351528] intel_spi_read(from=2000000, len=400000)
[  544.351528] intel_spi_read(from=2000000, len=400000)
End MTD read

With this change:

Start MTD read
[   21.942922] intel_spi_read(from=1c00000, len=400000)
[   21.942922] intel_spi_read(from=1c00000, len=400000)
[   23.784058] intel_spi_read(from=2000000, len=400000)
[   23.784058] intel_spi_read(from=2000000, len=400000)
[   25.625006] intel_spi_read(from=2400000, len=400000)
[   25.625006] intel_spi_read(from=2400000, len=400000)
End MTD read

Signed-off-by: Luis Alberto Herrera <luisalberto@google.com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20200610224652.64336-1-luisalberto@google.com
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
 2020-07-28 11:35:27 +03:00
Alexander Sverdlin
44a80df4bf mtd: spi-nor: intel-spi: Simulate WRDI command 
After spi_nor_write_disable() return code checks were introduced in the
spi-nor front end intel-spi backend stopped to work because WRDI was never
supported and always failed.

Just pretend it was sucessful and ignore the command itself. HW sequencer
shall do the right thing automatically, while with SW sequencer we cannot
do it anyway, because the only tool we had was preopcode and it makes no
sense for WRDI.

Fixes: bce679e5ae3a ("mtd: spi-nor: Check for errors after each Register Operation")
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/282e1305-fd08-e446-1a22-eb4dff78cfb4@nokia.com
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
 2020-07-27 08:24:39 +03:00
Boris Brezillon
a0900d0195
mtd: spi-nor: Prepare core / manufacturer code split 
Move all SPI NOR controller drivers to a controllers/ sub-directory
so that we only have SPI NOR related source files under
drivers/mtd/spi-nor/.

Rename spi-nor.c into core.c, we are about to split this file in multiple
source files (one per manufacturer, plus one for the SFDP parsing logic).

Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
 2020-03-16 18:28:53 +02:00