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spi: loopback-test: add elapsed time check

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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>
This commit is contained in:
Akinobu Mita 2017-03-18 03:17:30 +09:00 committed by Mark Brown
parent 0bd7fda56b
commit ea9936f324
2 changed files with 40 additions and 0 deletions
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38
drivers/spi/spi-loopback-test.c
View File

@ -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) */

2
drivers/spi/spi-test.h
View File

@ -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 */