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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2017-03-17 19:17:30 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-03-17 22:54:08 +0100 |
| commit | ea9936f32435699907807aaac87f993482208578 (patch) | |
| tree | 00bc559c0f00d049e1ee69732634ad0a6303f1ff /drivers/spi/spi-loopback-test.c | |
| parent | spi: loopback-test: test zero-length transfer (diff) | |
| download | linux-ea9936f32435699907807aaac87f993482208578.tar.xz linux-ea9936f32435699907807aaac87f993482208578.zip | |
spi: loopback-test: add elapsed time check
This adds checks whether the elapsed time is longer than the minimam
estimated time. The estimated time is calculated with the total
transfer length per clock rate and optional spi_transfer.delay_usecs.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-loopback-test.c')
| -rw-r--r-- | drivers/spi/spi-loopback-test.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/spi/spi-loopback-test.c b/drivers/spi/spi-loopback-test.c index 6df6dddc2890..66e8cfd04395 100644 --- a/drivers/spi/spi-loopback-test.c +++ b/drivers/spi/spi-loopback-test.c @@ -20,6 +20,7 @@ #include <linux/delay.h> #include <linux/kernel.h> +#include <linux/ktime.h> #include <linux/list.h> #include <linux/list_sort.h> #include <linux/module.h> @@ -479,6 +480,35 @@ static int spi_check_rx_ranges(struct spi_device *spi, return ret; } +static int spi_test_check_elapsed_time(struct spi_device *spi, + struct spi_test *test) +{ + int i; + unsigned long long estimated_time = 0; + unsigned long long delay_usecs = 0; + + for (i = 0; i < test->transfer_count; i++) { + struct spi_transfer *xfer = test->transfers + i; + unsigned long long nbits = BITS_PER_BYTE * xfer->len; + + delay_usecs += xfer->delay_usecs; + if (!xfer->speed_hz) + continue; + estimated_time += div_u64(nbits * NSEC_PER_SEC, xfer->speed_hz); + } + + estimated_time += delay_usecs * NSEC_PER_USEC; + if (test->elapsed_time < estimated_time) { + dev_err(&spi->dev, + "elapsed time %lld ns is shorter than minimam estimated time %lld ns\n", + test->elapsed_time, estimated_time); + + return -EINVAL; + } + + return 0; +} + static int spi_test_check_loopback_result(struct spi_device *spi, struct spi_message *msg, void *tx, void *rx) @@ -817,12 +847,16 @@ int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test, /* only if we do not simulate */ if (!simulate_only) { + ktime_t start; + /* dump the complete message before and after the transfer */ if (dump_messages == 3) spi_test_dump_message(spi, msg, true); + start = ktime_get(); /* run spi message */ ret = spi_sync(spi, msg); + test->elapsed_time = ktime_to_ns(ktime_sub(ktime_get(), start)); if (ret == -ETIMEDOUT) { dev_info(&spi->dev, "spi-message timed out - reruning...\n"); @@ -848,6 +882,10 @@ int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test, /* run rx-buffer tests */ ret = spi_test_check_loopback_result(spi, msg, tx, rx); + if (ret) + goto exit; + + ret = spi_test_check_elapsed_time(spi, test); } /* if requested or on error dump message (including data) */ |