From: <jiada_wang@mentor.com>
To: <broonie@kernel.org>
Cc: <linux-spi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Jiada Wang <jiada_wang@mentor.com>
Subject: [PATCH linux-next v2 0/1] improve imx spi performance
Date: Mon, 1 May 2017 03:31:43 -0700 [thread overview]
Message-ID: <1493634704-3545-1-git-send-email-jiada_wang@mentor.com> (raw)
From: Jiada Wang <jiada_wang@mentor.com>
previously burst length (BURST_LENGTH) is always set to equal
to bits_per_word, causes a 10us gap between each word in transfer,
which significantly affects performance.
This patch set uses 32 bits tranfser to simulate lowers bits transfer,
and by set burst length to maximum possible value to reduce number of gaps
in PIO transfers.
Jiada Wang (1):
spi: imx: dynamic burst length adjust for PIO mode
Changes from v2:
used cpu_to_* functions, to ensure this patch works for both
little & big endian kernel.
other minor fix.
drivers/spi/spi-imx.c | 157 +++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 149 insertions(+), 8 deletions(-)
--
2.7.4
next reply other threads:[~2017-05-01 10:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-01 10:31 jiada_wang [this message]
2017-05-01 10:31 ` [PATCH linux-next v2 1/1] spi: imx: dynamic burst length adjust for PIO mode jiada_wang
2017-05-15 8:04 ` Applied "spi: imx: dynamic burst length adjust for PIO mode" to the spi tree Mark Brown
2017-05-17 17:32 ` [PATCH linux-next v2 1/1] spi: imx: dynamic burst length adjust for PIO mode Leonard Crestez
2017-05-18 1:50 ` Jiada Wang
2017-05-18 9:29 ` Leonard Crestez
2017-05-14 10:06 ` [PATCH linux-next v2 0/1] improve imx spi performance Mark Brown
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