Patch "spi: sunxi: fix transfer timeout" has been added to the 4.6-stable tree
From: <gregkh@linuxfoundation.org>
Date: 2016-08-03 06:33:10
This is a note to let you know that I've just added the patch titled
spi: sunxi: fix transfer timeout
to the 4.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-sunxi-fix-transfer-timeout.patch
and it can be found in the queue-4.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.
From 719bd6542044efd9b338a53dba1bef45f40ca169 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <redacted> Date: Mon, 13 Jun 2016 17:46:49 +0000 Subject: spi: sunxi: fix transfer timeout From: Michal Suchanek <redacted> commit 719bd6542044efd9b338a53dba1bef45f40ca169 upstream. The trasfer timeout is fixed at 1000 ms. Reading a 4Mbyte flash over 1MHz SPI bus takes way longer than that. Calculate the timeout from the actual time the transfer is supposed to take and multiply by 2 for good measure. Signed-off-by: Michal Suchanek <redacted> Acked-by: Maxime Ripard <redacted> Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/spi/spi-sun4i.c | 10 +++++++++- drivers/spi/spi-sun6i.c | 10 +++++++++- 2 files changed, 18 insertions(+), 2 deletions(-)
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c@@ -173,6 +173,7 @@ static int sun4i_spi_transfer_one(struct { struct sun4i_spi *sspi = spi_master_get_devdata(master); unsigned int mclk_rate, div, timeout; + unsigned int start, end, tx_time; unsigned int tx_len = 0; int ret = 0; u32 reg;
@@ -279,9 +280,16 @@ static int sun4i_spi_transfer_one(struct reg = sun4i_spi_read(sspi, SUN4I_CTL_REG); sun4i_spi_write(sspi, SUN4I_CTL_REG, reg | SUN4I_CTL_XCH); + tx_time = max(tfr->len * 8 * 2 / (tfr->speed_hz / 1000), 100U); + start = jiffies; timeout = wait_for_completion_timeout(&sspi->done, - msecs_to_jiffies(1000)); + msecs_to_jiffies(tx_time)); + end = jiffies; if (!timeout) { + dev_warn(&master->dev, + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", + dev_name(&spi->dev), tfr->len, tfr->speed_hz, + jiffies_to_msecs(end - start), tx_time); ret = -ETIMEDOUT; goto out; } --- a/drivers/spi/spi-sun6i.c +++ b/drivers/spi/spi-sun6i.c
@@ -160,6 +160,7 @@ static int sun6i_spi_transfer_one(struct { struct sun6i_spi *sspi = spi_master_get_devdata(master); unsigned int mclk_rate, div, timeout; + unsigned int start, end, tx_time; unsigned int tx_len = 0; int ret = 0; u32 reg;
@@ -269,9 +270,16 @@ static int sun6i_spi_transfer_one(struct reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG); sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg | SUN6I_TFR_CTL_XCH); + tx_time = max(tfr->len * 8 * 2 / (tfr->speed_hz / 1000), 100U); + start = jiffies; timeout = wait_for_completion_timeout(&sspi->done, - msecs_to_jiffies(1000)); + msecs_to_jiffies(tx_time)); + end = jiffies; if (!timeout) { + dev_warn(&master->dev, + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", + dev_name(&spi->dev), tfr->len, tfr->speed_hz, + jiffies_to_msecs(end - start), tx_time); ret = -ETIMEDOUT; goto out; }
Patches currently in stable-queue which might be from hramrach@gmail.com are queue-4.6/spi-sun4i-fix-fifo-limit.patch queue-4.6/spi-sunxi-fix-transfer-timeout.patch