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spi: limit esp32 dma workaround only on esp32

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This commit is contained in:
Armando 2022-09-15 18:26:12 +08:00 committed by wanlei
parent a7289587d3
commit ea0b839302
6 changed files with 37 additions and 18 deletions
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4
components/driver/include/esp_private/spi_common_internal.h
View File

@ -227,7 +227,8 @@ int spicommon_irqdma_source_for_host(spi_host_device_t host);
*/
typedef void(*dmaworkaround_cb_t)(void *arg);
#if CONFIG_IDF_TARGET_ESP32
//This workaround is only for esp32
/**
* @brief Request a reset for a certain DMA channel
*
@ -274,6 +275,7 @@ void spicommon_dmaworkaround_idle(int dmachan);
* be affected by a global SPI DMA reset, and a reset like that should not be attempted.
*/
void spicommon_dmaworkaround_transfer_active(int dmachan);
#endif //#if CONFIG_IDF_TARGET_ESP32
/*******************************************************************************
* Bus attributes

16
components/driver/spi_common.c
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@ -913,11 +913,10 @@ static dmaworkaround_cb_t dmaworkaround_cb;
static void *dmaworkaround_cb_arg;
static portMUX_TYPE dmaworkaround_mux = portMUX_INITIALIZER_UNLOCKED;
static int dmaworkaround_waiting_for_chan = 0;
#endif
bool IRAM_ATTR spicommon_dmaworkaround_req_reset(int dmachan, dmaworkaround_cb_t cb, void *arg)
{
#if CONFIG_IDF_TARGET_ESP32
int otherchan = (dmachan == 1) ? 2 : 1;
bool ret;
portENTER_CRITICAL_ISR(&dmaworkaround_mux);
@ -934,24 +933,15 @@ bool IRAM_ATTR spicommon_dmaworkaround_req_reset(int dmachan, dmaworkaround_cb_t
}
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
return ret;
#else
//no need to reset
return true;
#endif
}
bool IRAM_ATTR spicommon_dmaworkaround_reset_in_progress(void)
{
#if CONFIG_IDF_TARGET_ESP32
return (dmaworkaround_waiting_for_chan != 0);
#else
return false;
#endif
}
void IRAM_ATTR spicommon_dmaworkaround_idle(int dmachan)
{
#if CONFIG_IDF_TARGET_ESP32
portENTER_CRITICAL_ISR(&dmaworkaround_mux);
dmaworkaround_channels_busy[dmachan-1] = 0;
if (dmaworkaround_waiting_for_chan == dmachan) {
@ -963,14 +953,12 @@ void IRAM_ATTR spicommon_dmaworkaround_idle(int dmachan)
}
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
#endif
}
void IRAM_ATTR spicommon_dmaworkaround_transfer_active(int dmachan)
{
#if CONFIG_IDF_TARGET_ESP32
portENTER_CRITICAL_ISR(&dmaworkaround_mux);
dmaworkaround_channels_busy[dmachan-1] = 1;
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
#endif
}
#endif //#if CONFIG_IDF_TARGET_ESP32

11
components/driver/spi_master.c
View File

@ -632,10 +632,13 @@ static void SPI_MASTER_ISR_ATTR spi_intr(void *arg)
//Okay, transaction is done.
const int cs = host->cur_cs;
//Tell common code DMA workaround that our DMA channel is idle. If needed, the code will do a DMA reset.
#if CONFIG_IDF_TARGET_ESP32
if (bus_attr->dma_enabled) {
//This workaround is only for esp32, where tx_dma_chan and rx_dma_chan are always same
spicommon_dmaworkaround_idle(bus_attr->tx_dma_chan);
}
#endif //#if CONFIG_IDF_TARGET_ESP32
//cur_cs is changed to DEV_NUM_MAX here
spi_post_trans(host);
@ -691,11 +694,13 @@ static void SPI_MASTER_ISR_ATTR spi_intr(void *arg)
if (trans_found) {
spi_trans_priv_t *const cur_trans_buf = &host->cur_trans_buf;
#if CONFIG_IDF_TARGET_ESP32
if (bus_attr->dma_enabled && (cur_trans_buf->buffer_to_rcv || cur_trans_buf->buffer_to_send)) {
//mark channel as active, so that the DMA will not be reset by the slave
//This workaround is only for esp32, where tx_dma_chan and rx_dma_chan are always same
spicommon_dmaworkaround_transfer_active(bus_attr->tx_dma_chan);
}
#endif //#if CONFIG_IDF_TARGET_ESP32
spi_new_trans(device_to_send, cur_trans_buf);
}
// Exit of the ISR, handle interrupt re-enable (if sending transaction), retry (if there's coming BG),
@ -929,10 +934,14 @@ esp_err_t SPI_MASTER_ISR_ATTR spi_device_acquire_bus(spi_device_t *device, TickT
//configure the device ahead so that we don't need to do it again in the following transactions
spi_setup_device(host->device[device->id]);
//the DMA is also occupied by the device, all the slave devices that using DMA should wait until bus released.
#if CONFIG_IDF_TARGET_ESP32
if (host->bus_attr->dma_enabled) {
//This workaround is only for esp32, where tx_dma_chan and rx_dma_chan are always same
spicommon_dmaworkaround_transfer_active(host->bus_attr->tx_dma_chan);
}
#endif //#if CONFIG_IDF_TARGET_ESP32
return ESP_OK;
}
@ -946,11 +955,13 @@ void SPI_MASTER_ISR_ATTR spi_device_release_bus(spi_device_t *dev)
assert(0);
}
#if CONFIG_IDF_TARGET_ESP32
if (host->bus_attr->dma_enabled) {
//This workaround is only for esp32, where tx_dma_chan and rx_dma_chan are always same
spicommon_dmaworkaround_idle(host->bus_attr->tx_dma_chan);
}
//Tell common code DMA workaround that our DMA channel is idle. If needed, the code will do a DMA reset.
#endif //#if CONFIG_IDF_TARGET_ESP32
//allow clock to be lower than 80MHz when all tasks blocked
#ifdef CONFIG_PM_ENABLE

19
components/driver/spi_slave.c
View File

@ -358,11 +358,13 @@ esp_err_t SPI_SLAVE_ATTR spi_slave_transmit(spi_host_device_t host, spi_slave_tr
return ESP_OK;
}
#if CONFIG_IDF_TARGET_ESP32
static void SPI_SLAVE_ISR_ATTR spi_slave_restart_after_dmareset(void *arg)
{
spi_slave_t *host = (spi_slave_t *)arg;
esp_intr_enable(host->intr);
}
#endif //#if CONFIG_IDF_TARGET_ESP32
//This is run in interrupt context and apart from initialization and destruction, this is the only code
//touching the host (=spihost[x]) variable. The rest of the data arrives in queues. That is why there are
@ -385,10 +387,14 @@ static void SPI_SLAVE_ISR_ATTR spi_intr(void *arg)
spi_slave_hal_store_result(hal);
host->cur_trans->trans_len = spi_slave_hal_get_rcv_bitlen(hal);
#if CONFIG_IDF_TARGET_ESP32
//This workaround is only for esp32
if (spi_slave_hal_dma_need_reset(hal)) {
//On ESP32 and ESP32S2, actual_tx_dma_chan and actual_rx_dma_chan are always same
//On ESP32, actual_tx_dma_chan and actual_rx_dma_chan are always same
spicommon_dmaworkaround_req_reset(host->tx_dma_chan, spi_slave_restart_after_dmareset, host);
}
#endif //#if CONFIG_IDF_TARGET_ESP32
if (host->cfg.post_trans_cb) host->cfg.post_trans_cb(host->cur_trans);
if(!(host->cfg.flags & SPI_SLAVE_NO_RETURN_RESULT)) {
@ -396,8 +402,11 @@ static void SPI_SLAVE_ISR_ATTR spi_intr(void *arg)
}
host->cur_trans = NULL;
}
#if CONFIG_IDF_TARGET_ESP32
//This workaround is only for esp32
if (use_dma) {
//On ESP32 and ESP32S2, actual_tx_dma_chan and actual_rx_dma_chan are always same
//On ESP32, actual_tx_dma_chan and actual_rx_dma_chan are always same
spicommon_dmaworkaround_idle(host->tx_dma_chan);
if (spicommon_dmaworkaround_reset_in_progress()) {
//We need to wait for the reset to complete. Disable int (will be re-enabled on reset callback) and exit isr.
@ -406,6 +415,7 @@ static void SPI_SLAVE_ISR_ATTR spi_intr(void *arg)
return;
}
}
#endif //#if CONFIG_IDF_TARGET_ESP32
//Disable interrupt before checking to avoid concurrency issue.
esp_intr_disable(host->intr);
@ -425,10 +435,13 @@ static void SPI_SLAVE_ISR_ATTR spi_intr(void *arg)
hal->rx_buffer = trans->rx_buffer;
hal->tx_buffer = trans->tx_buffer;
#if CONFIG_IDF_TARGET_ESP32
if (use_dma) {
//On ESP32 and ESP32S2, actual_tx_dma_chan and actual_rx_dma_chan are always same
//This workaround is only for esp32
//On ESP32, actual_tx_dma_chan and actual_rx_dma_chan are always same
spicommon_dmaworkaround_transfer_active(host->tx_dma_chan);
}
#endif //#if CONFIG_IDF_TARGET_ESP32
spi_slave_hal_prepare_data(hal);

2
components/hal/include/hal/spi_slave_hal.h
View File

@ -142,6 +142,7 @@ void spi_slave_hal_store_result(spi_slave_hal_context_t *hal);
*/
uint32_t spi_slave_hal_get_rcv_bitlen(spi_slave_hal_context_t *hal);
#if CONFIG_IDF_TARGET_ESP32
/**
* Check whether we need to reset the DMA according to the status of last transactions.
*
@ -153,3 +154,4 @@ uint32_t spi_slave_hal_get_rcv_bitlen(spi_slave_hal_context_t *hal);
* @return true if reset is needed, else false.
*/
bool spi_slave_hal_dma_need_reset(const spi_slave_hal_context_t *hal);
#endif //#if CONFIG_IDF_TARGET_ESP32

3
components/hal/spi_slave_hal_iram.c
View File

@ -98,6 +98,8 @@ uint32_t spi_slave_hal_get_rcv_bitlen(spi_slave_hal_context_t *hal)
return hal->rcv_bitlen;
}
#if CONFIG_IDF_TARGET_ESP32
//This workaround is only for esp32
bool spi_slave_hal_dma_need_reset(const spi_slave_hal_context_t *hal)
{
bool ret;
@ -114,3 +116,4 @@ bool spi_slave_hal_dma_need_reset(const spi_slave_hal_context_t *hal)
}
return ret;
}
#endif //#if CONFIG_IDF_TARGET_ESP32