On Wed, Jun 10, 2020 at 10:46:49PM +0000, Luis Alberto Herrera wrote: > 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 <luisalbe...@google.com>
Acked-by: Mika Westerberg <mika.westerb...@linux.intel.com>
