spi: spi_amd: Optimize IO operations

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Read and write the maximum number of data bytes at once, rather than byte
by byte. This improves AMD SPI controller driver performance by reducing
the time required to access FIFO registers. For example, with the new
changes, 64 bytes of data from the FIFO queue can be read in 8 read calls
(8 bytes per call) instead of 64 read calls(1 byte per call).

Co-developed-by: Krishnamoorthi M <krishnamoorthi.m@amd.com>
Signed-off-by: Krishnamoorthi M <krishnamoorthi.m@amd.com>
Co-developed-by: Akshata MukundShetty <akshata.mukundshetty@amd.com>
Signed-off-by: Akshata MukundShetty <akshata.mukundshetty@amd.com>
Signed-off-by: Raju Rangoju <Raju.Rangoju@amd.com>
Link: https://patch.msgid.link/20240925133644.2922359-6-Raju.Rangoju@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Raju Rangoju 2024-09-25 19:06:41 +05:30 • committed by Mark Brown

parent 8cd9141ad4

commit d97735d42a

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drivers/spi/spi-amd.c

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