[PATCH 1/9] spi: sunxi: fix transfer timeout
From: Michal Suchanek <hidden>
Date: 2015-08-20 14:19:45
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> --- drivers/spi/spi-sun4i.c | 10 +++++++++- drivers/spi/spi-sun6i.c | 10 +++++++++- 2 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index fbb0a4d..48532ec 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c@@ -170,6 +170,7 @@ 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;
@@ -279,9 +280,16 @@ 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_t(int, tfr->len * 8 * 2 / (speed / 1000), 100); + 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, speed, + jiffies_to_msecs(end - start), tx_time); ret = -ETIMEDOUT; goto out; }
diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
index ac48f59..3d0f66c 100644
--- a/drivers/spi/spi-sun6i.c
+++ b/drivers/spi/spi-sun6i.c@@ -162,6 +162,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master, unsigned int mclk_rate, div, timeout; unsigned int tx_len = 0; int ret = 0; + unsigned int start, end, tx_time; u32 reg; /* We don't support transfer larger than the FIFO */
@@ -269,9 +270,16 @@ static int sun6i_spi_transfer_one(struct spi_master *master, 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_t(int, tfr->len * 8 * 2 / (speed / 1000), 100); + 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, speed, + jiffies_to_msecs(end - start), tx_time); ret = -ETIMEDOUT; goto out; }
--
2.1.4