spi: loopback-test: add ability to test zero-length transfer
The spi-loopback-test module currently cannot test the spi_message
including a zero-length transfer. Because the zero-length transfer is
treated as a special value in several meanings.
1. The number of spi_transfer to execute in one test case is described
by spi_test.transfer_count. It is normally computed by counting number
of transfers with len > 0 in spi_test.transfers array.
This change stops the detection for the number of spi_transfer. Each
spi_test.transfer_count needs to be filled by hand now.
2. The spi_test.iterate_len is a list of transfer length to iterate on.
This list is terminated by zero, so zero-length transfer cannot be
included.
This changes the terminal value from 0 to -1.
3. The length for the spi_transfer masked by spi_test.iterate_transfer_mask
is iterated. Before starting the iteration, the default value which
is statically initialized is applied. In order to specify the default
value, zero-length is reserved.
Currently, the default values are always '1'. So this removes this
trick and add '1' to iterate_len list.
By applying all these changes, the spi-loopback-test can execute spi
messages with zero-length transfer.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/spi/spi-loopback-test.c b/drivers/spi/spi-loopback-test.c
index 85c0c4e..6df6ddd 100644
--- a/drivers/spi/spi-loopback-test.c
+++ b/drivers/spi/spi-loopback-test.c
@@ -63,9 +63,9 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_rx_align = ITERATE_ALIGN,
+ .transfer_count = 1,
.transfers = {
{
- .len = 1,
.tx_buf = TX(0),
.rx_buf = RX(0),
},
@@ -77,9 +77,9 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_rx_align = ITERATE_ALIGN,
+ .transfer_count = 1,
.transfers = {
{
- .len = 1,
.tx_buf = TX(PAGE_SIZE - 4),
.rx_buf = RX(PAGE_SIZE - 4),
},
@@ -90,9 +90,9 @@ static struct spi_test spi_tests[] = {
.fill_option = FILL_COUNT_8,
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
+ .transfer_count = 1,
.transfers = {
{
- .len = 1,
.tx_buf = TX(0),
},
},
@@ -102,9 +102,9 @@ static struct spi_test spi_tests[] = {
.fill_option = FILL_COUNT_8,
.iterate_len = { ITERATE_MAX_LEN },
.iterate_rx_align = ITERATE_ALIGN,
+ .transfer_count = 1,
.transfers = {
{
- .len = 1,
.rx_buf = RX(0),
},
},
@@ -115,13 +115,12 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(0) | BIT(1),
+ .transfer_count = 2,
.transfers = {
{
- .len = 1,
.tx_buf = TX(0),
},
{
- .len = 1,
/* this is why we cant use ITERATE_MAX_LEN */
.tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
},
@@ -133,9 +132,9 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(0),
+ .transfer_count = 2,
.transfers = {
{
- .len = 1,
.tx_buf = TX(64),
},
{
@@ -150,13 +149,13 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(1),
+ .transfer_count = 2,
.transfers = {
{
.len = 16,
.tx_buf = TX(0),
},
{
- .len = 1,
.tx_buf = TX(64),
},
},
@@ -167,13 +166,12 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(0) | BIT(1),
+ .transfer_count = 2,
.transfers = {
{
- .len = 1,
.tx_buf = TX(0),
},
{
- .len = 1,
.rx_buf = RX(0),
},
},
@@ -184,9 +182,9 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(0),
+ .transfer_count = 2,
.transfers = {
{
- .len = 1,
.tx_buf = TX(0),
},
{
@@ -201,13 +199,13 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(1),
+ .transfer_count = 2,
.transfers = {
{
.len = 1,
.tx_buf = TX(0),
},
{
- .len = 1,
.rx_buf = RX(0),
},
},
@@ -218,14 +216,13 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(0) | BIT(1),
+ .transfer_count = 2,
.transfers = {
{
- .len = 1,
.tx_buf = TX(0),
.rx_buf = RX(0),
},
{
- .len = 1,
/* making sure we align without overwrite
* the reason we can not use ITERATE_MAX_LEN
*/
@@ -240,9 +237,9 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(0),
+ .transfer_count = 2,
.transfers = {
{
- .len = 1,
/* making sure we align without overwrite */
.tx_buf = TX(1024),
.rx_buf = RX(1024),
@@ -261,6 +258,7 @@ static struct spi_test spi_tests[] = {
.iterate_len = { ITERATE_MAX_LEN },
.iterate_tx_align = ITERATE_ALIGN,
.iterate_transfer_mask = BIT(1),
+ .transfer_count = 2,
.transfers = {
{
.len = 1,
@@ -268,7 +266,6 @@ static struct spi_test spi_tests[] = {
.rx_buf = RX(0),
},
{
- .len = 1,
/* making sure we align without overwrite */
.tx_buf = TX(1024),
.rx_buf = RX(1024),
@@ -503,7 +500,7 @@ static int spi_test_check_loopback_result(struct spi_device *spi,
/* if applicable to transfer check that rx_buf is equal to tx_buf */
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
/* if there is no rx, then no check is needed */
- if (!xfer->rx_buf)
+ if (!xfer->len || !xfer->rx_buf)
continue;
/* so depending on tx_buf we need to handle things */
if (xfer->tx_buf) {
@@ -745,15 +742,6 @@ static int spi_test_run_iter(struct spi_device *spi,
/* copy the test template to test */
memcpy(&test, testtemplate, sizeof(test));
- /* set up test->transfers to the correct count */
- if (!test.transfer_count) {
- for (i = 0;
- (i < SPI_TEST_MAX_TRANSFERS) && test.transfers[i].len;
- i++) {
- test.transfer_count++;
- }
- }
-
/* if iterate_transfer_mask is not set,
* then set it to first transfer only
*/
@@ -799,8 +787,7 @@ static int spi_test_run_iter(struct spi_device *spi,
/* only when bit in transfer mask is set */
if (!(test.iterate_transfer_mask & BIT(i)))
continue;
- if (len)
- test.transfers[i].len = len;
+ test.transfers[i].len = len;
if (test.transfers[i].tx_buf)
test.transfers[i].tx_buf += tx_off;
if (test.transfers[i].tx_buf)
@@ -910,15 +897,6 @@ int spi_test_run_test(struct spi_device *spi, const struct spi_test *test,
/* iterate over all the iterable values using macros
* (to make it a bit more readable...
*/
-#define FOR_EACH_ITERATE(var, defaultvalue) \
- for (idx_##var = -1, var = defaultvalue; \
- ((idx_##var < 0) || \
- ( \
- (idx_##var < SPI_TEST_MAX_ITERATE) && \
- (var = test->iterate_##var[idx_##var]) \
- ) \
- ); \
- idx_##var++)
#define FOR_EACH_ALIGNMENT(var) \
for (var = 0; \
var < (test->iterate_##var ? \
@@ -928,7 +906,8 @@ int spi_test_run_test(struct spi_device *spi, const struct spi_test *test,
1); \
var++)
- FOR_EACH_ITERATE(len, 0) {
+ for (idx_len = 0; idx_len < SPI_TEST_MAX_ITERATE &&
+ (len = test->iterate_len[idx_len]) != -1; idx_len++) {
FOR_EACH_ALIGNMENT(tx_align) {
FOR_EACH_ALIGNMENT(rx_align) {
/* and run the iteration */