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I2C: Enable Power Management locks

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Acquires PM_APB_FREQ_MAX lock when carrying any transaction on I2C if
Power Management Framework is enabled.

Signed-off-by: Sachin Parekh <sachin.parekh@espressif.com>
This commit is contained in:
Sachin Parekh 2019-02-22 17:44:03 +05:30 committed by bot
parent 15a9d4f4d3
commit 2b6f7697b9
1 changed files with 29 additions and 0 deletions
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29
components/driver/i2c.c
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@ -29,6 +29,7 @@
#include "driver/i2c.h"
#include "driver/gpio.h"
#include "driver/periph_ctrl.h"
#include "esp_pm.h"
static const char* I2C_TAG = "i2c";
#define I2C_CHECK(a, str, ret) if(!(a)) { \
@ -67,6 +68,7 @@ static DRAM_ATTR i2c_dev_t* const I2C[I2C_NUM_MAX] = { &I2C0, &I2C1 };
#define I2C_ACK_TYPE_ERR_STR "i2c ack type error"
#define I2C_DATA_LEN_ERR_STR "i2c data read length error"
#define I2C_PSRAM_BUFFER_WARN_STR "Using buffer allocated from psram"
#define I2C_LOCK_ERR_STR "Power lock creation error"
#define I2C_FIFO_FULL_THRESH_VAL (28)
#define I2C_FIFO_EMPTY_THRESH_VAL (5)
#define I2C_IO_INIT_LEVEL (1)
@ -134,6 +136,9 @@ typedef struct {
StaticQueue_t evt_queue_buffer; /*!< The buffer that will hold the queue structure*/
#endif
xSemaphoreHandle cmd_mux; /*!< semaphore to lock command process */
#ifdef CONFIG_PM_ENABLE
esp_pm_lock_handle_t pm_lock;
#endif
size_t tx_fifo_remain; /*!< tx fifo remain length, for master mode */
size_t rx_fifo_remain; /*!< rx fifo remain length, for master mode */
@ -226,6 +231,12 @@ esp_err_t i2c_driver_install(i2c_port_t i2c_num, i2c_mode_t mode, size_t slv_rx_
} else {
//semaphore to sync sending process, because we only have 32 bytes for hardware fifo.
p_i2c->cmd_mux = xSemaphoreCreateMutex();
#ifdef CONFIG_PM_ENABLE
if (esp_pm_lock_create(ESP_PM_APB_FREQ_MAX, 0, "i2c_driver", &p_i2c->pm_lock) != ESP_OK) {
ESP_LOGE(I2C_TAG, I2C_LOCK_ERR_STR);
goto err;
}
#endif
#if !CONFIG_SPIRAM_USE_MALLOC
p_i2c->cmd_evt_queue = xQueueCreate(I2C_EVT_QUEUE_LEN, sizeof(i2c_cmd_evt_t));
#else
@ -297,6 +308,12 @@ esp_err_t i2c_driver_install(i2c_port_t i2c_num, i2c_mode_t mode, size_t slv_rx_
if (p_i2c_obj[i2c_num]->slv_tx_mux) {
vSemaphoreDelete(p_i2c_obj[i2c_num]->slv_tx_mux);
}
#ifdef CONFIG_PM_ENABLE
if (p_i2c_obj[i2c_num]->pm_lock) {
esp_pm_lock_delete(p_i2c_obj[i2c_num]->pm_lock);
p_i2c_obj[i2c_num]->pm_lock = NULL;
}
#endif
#if CONFIG_SPIRAM_USE_MALLOC
if (p_i2c_obj[i2c_num]->evt_queue_storage) {
free(p_i2c_obj[i2c_num]->evt_queue_storage);
@ -365,6 +382,12 @@ esp_err_t i2c_driver_delete(i2c_port_t i2c_num)
p_i2c->tx_ring_buf = NULL;
p_i2c->tx_buf_length = 0;
}
#ifdef CONFIG_PM_ENABLE
if (p_i2c->pm_lock) {
esp_pm_lock_delete(p_i2c->pm_lock);
p_i2c->pm_lock = NULL;
}
#endif
#if CONFIG_SPIRAM_USE_MALLOC
if (p_i2c_obj[i2c_num]->evt_queue_storage) {
free(p_i2c_obj[i2c_num]->evt_queue_storage);
@ -1261,6 +1284,9 @@ esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle,
i2c_obj_t* p_i2c = p_i2c_obj[i2c_num];
portTickType ticks_start = xTaskGetTickCount();
portBASE_TYPE res = xSemaphoreTake(p_i2c->cmd_mux, ticks_to_wait);
#ifdef CONFIG_PM_ENABLE
esp_pm_lock_acquire(p_i2c->pm_lock);
#endif
if (res == pdFALSE) {
return ESP_ERR_TIMEOUT;
}
@ -1338,6 +1364,9 @@ esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle,
}
}
p_i2c->status = I2C_STATUS_DONE;
#ifdef CONFIG_PM_ENABLE
esp_pm_lock_release(p_i2c->pm_lock);
#endif
xSemaphoreGive(p_i2c->cmd_mux);
return ret;
}