diff options
| -rw-r--r-- | drivers/spi/spi-loopback-test.c | 38 | ||||
| -rw-r--r-- | drivers/spi/spi-test.h | 2 |
2 files changed, 40 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) */ diff --git a/drivers/spi/spi-test.h b/drivers/spi/spi-test.h index 82fff4a0fd94..6ed7b899da8a 100644 --- a/drivers/spi/spi-test.h +++ b/drivers/spi/spi-test.h @@ -75,6 +75,7 @@ * @fill_option: define the way how tx_buf is filled * @fill_pattern: fill pattern to apply to the tx_buf * (used in some of the @fill_options) + * @elapsed_time: elapsed time in nanoseconds */ struct spi_test { @@ -108,6 +109,7 @@ struct spi_test { #define FILL_TRANSFER_BYTE_32 11 /* fill with the transfer byte - 32 bit */ #define FILL_TRANSFER_NUM 16 /* fill with the transfer number */ u32 fill_pattern; + unsigned long long elapsed_time; }; /* default implementation for @spi_test.run_test */ |