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| author | Vignesh R <[email protected]> | 2015-10-13 10:21:05 +0000 |
|---|---|---|
| committer | Mark Brown <[email protected]> | 2015-10-16 18:08:06 +0000 |
| commit | 57c2ecd9bf971946ea0c6ae90a79c90a22159c73 (patch) | |
| tree | a27454ff77f3d5c5e8747d54a5f132ccb7191b47 /drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | |
| parent | Linux 4.3-rc1 (diff) | |
| download | kernel-57c2ecd9bf971946ea0c6ae90a79c90a22159c73.tar.gz kernel-57c2ecd9bf971946ea0c6ae90a79c90a22159c73.zip | |
spi: spi-ti-qspi: switch to polling mode for better r/w performance
Currently word completion interrupt is fired for transfer of every
word(8bit to 128bit in size). This adds a lot of overhead, and decreases
r/w throughput. It hardly takes 3us(@48MHz) for 128bit r/w to complete,
hence its better to poll on word complete bit to be set in
QSPI_SPI_STATUS_REG instead of using interrupts.
This increases the throughput by 30% in both read and write case.
So, switch to polling mode instead of interrupts to determine completion
of word transfer.
Signed-off-by: Vignesh R <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_object.c')
0 files changed, 0 insertions, 0 deletions