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drivers: spi_context: Do not use transfer timeout in slave mode

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Do not use any timeout in the slave mode, as in this case it is not
known when the transfer will actually start and what the frequency
will be.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
This commit is contained in:
Andrzej Głąbek 2021-10-27 15:57:08 +02:00 • committed by Carles Cufí
commit 3489ca9da2
1 changed files with 18 additions and 6 deletions
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16
drivers/spi/spi_context.h
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@ -128,22 +128,34 @@ static inline void spi_context_release(struct spi_context *ctx, int status)
static inline int spi_context_wait_for_completion(struct spi_context *ctx)
{
int status = 0;
k_timeout_t timeout;
/* Do not use any timeout in the slave mode, as in this case it is not
* known when the transfer will actually start and what the frequency
* will be.
*/
if (IS_ENABLED(CONFIG_SPI_SLAVE) && spi_context_is_slave(ctx)) {
timeout = K_FOREVER;
} else {
uint32_t timeout_ms;
timeout_ms = MAX(ctx->tx_len, ctx->rx_len) * 8 * 1000 /
ctx->config->frequency;
timeout_ms += CONFIG_SPI_COMPLETION_TIMEOUT_TOLERANCE;
timeout = K_MSEC(timeout_ms);
}
#ifdef CONFIG_SPI_ASYNC
if (!ctx->asynchronous) {
if (k_sem_take(&ctx->sync, K_MSEC(timeout_ms))) {
if (k_sem_take(&ctx->sync, timeout)) {
LOG_ERR("Timeout waiting for transfer complete");
return -ETIMEDOUT;
}
status = ctx->sync_status;
}
#else
if (k_sem_take(&ctx->sync, K_MSEC(timeout_ms))) {
if (k_sem_take(&ctx->sync, timeout)) {
LOG_ERR("Timeout waiting for transfer complete");
return -ETIMEDOUT;
}