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| author | Michal Suchanek <hramrach@gmail.com> | 2016-06-13 17:46:49 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-06-14 10:05:18 +0100 |
| commit | 719bd6542044efd9b338a53dba1bef45f40ca169 (patch) | |
| tree | 837acfe993c8949db1570b977c6dd5d2a3cb37fb /drivers/spi/spi-sun4i.c | |
| parent | 6d9fe44bd73d567d04d3a68a2d2fa521ab9532f2 (diff) | |
| download | linux-719bd6542044efd9b338a53dba1bef45f40ca169.tar.gz linux-719bd6542044efd9b338a53dba1bef45f40ca169.tar.bz2 linux-719bd6542044efd9b338a53dba1bef45f40ca169.zip | |
spi: sunxi: fix transfer timeout
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 <hramrach@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/spi/spi-sun4i.c')
| -rw-r--r-- | drivers/spi/spi-sun4i.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c index e7e4aecb3295..cf007f3b83ec 100644 --- a/drivers/spi/spi-sun4i.c +++ b/drivers/spi/spi-sun4i.c @@ -173,6 +173,7 @@ static int sun4i_spi_transfer_one(struct spi_master *master, { 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; @@ -286,9 +287,16 @@ static int sun4i_spi_transfer_one(struct spi_master *master, 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; } |