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authorPeter Senna Tschudin <peter.senna@collabora.com>2017-04-07 11:45:24 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-04-11 21:36:43 +0200
commit18a4208826dd0a13eb06de724c86bba2c225f943 (patch)
treee49c8cfaa331800383c72e5277d2f06d0016f7bc /drivers/tty/vt
parent77e6fe7fd2b7cba0bf2f2dc8cde51d7b9a35bf74 (diff)
downloadlinux-18a4208826dd0a13eb06de724c86bba2c225f943.tar.bz2
imx-serial: Reduce RX DMA startup latency when opening for reading
Reduce RX DMA start latency for the first reception when port is opened for reading. Instead of waiting for an interrupt signaling data on RX FIFO or data too old on RX FIFO, start RX DMA immediately when the serial port is opened for reading. Before this patch, the average RX DMA latency for the first reception was 42489 microseconds with a standard deviation of 25721 microseconds in 36 samples. After the patch the average RX DMA latency for the first reception, when the serial port is opened for reading, is 653 microseconds with a standard deviation of 294 microseconds in 36 samples. Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/vt')
0 files changed, 0 insertions, 0 deletions