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Commit a55f0ba3 authored by Abhijeet Dharmapurikar's avatar Abhijeet Dharmapurikar
Browse files

power: qpnp-fg: support variable sram update periods 



Add support to modify the fuel gauge sram refresh rate via the module
parameter sram_update_period_ms.

Change-Id: I94dab77d15c66f944a35ec644a95d746a68f3d43
Signed-off-by: default avatarXiaozhe Shi <xiaozhes@codeaurora.org>
Signed-off-by: default avatarAbhijeet Dharmapurikar <adharmap@codeaurora.org>
parent cfd7f061

drivers/power/qpnp-fg.c

+27 −5
Original line number Diff line number Diff line
@@ -247,6 +247,11 @@ module_param_named( 
	battery_type, fg_batt_type, charp, S_IRUSR | S_IWUSR

);



static int fg_sram_update_period_ms = 30000;

module_param_named(

	sram_update_period_ms, fg_sram_update_period_ms, int, S_IRUSR | S_IWUSR

);



struct fg_irq {

	int			irq;

	unsigned long		disabled;
@@ -1845,7 +1850,6 @@ static int64_t twos_compliment_extend(int64_t val, int nbytes) 
#define LSB_8B		9800

#define TEMP_LSB_16B	625

#define DECIKELVIN	2730

#define SRAM_PERIOD_UPDATE_MS		30000

#define SRAM_PERIOD_NO_ID_UPDATE_MS	100

#define FULL_PERCENT_28BIT		0xFFFFFFF

static void update_sram_data(struct fg_chip *chip, int *resched_ms)
@@ -1926,22 +1930,39 @@ static void update_sram_data(struct fg_chip *chip, int *resched_ms) 


	if (battid_valid) {

		complete_all(&chip->batt_id_avail);

		*resched_ms = SRAM_PERIOD_UPDATE_MS;

		*resched_ms = fg_sram_update_period_ms;

	} else {

		*resched_ms = SRAM_PERIOD_NO_ID_UPDATE_MS;

	}

	fg_relax(&chip->update_sram_wakeup_source);

}



#define SRAM_TIMEOUT_MS			3000

static void update_sram_data_work(struct work_struct *work)

{

	struct fg_chip *chip = container_of(work,

				struct fg_chip,

				update_sram_data.work);

	int resched_ms;

	int resched_ms, ret;

	bool tried_again = false;



wait:

	/* Wait for MEMIF access revoked */

	ret = wait_for_completion_interruptible_timeout(

			&chip->sram_access_revoked,

			msecs_to_jiffies(SRAM_TIMEOUT_MS));



	/* If we were interrupted wait again one more time. */

	if (ret == -ERESTARTSYS && !tried_again) {

		tried_again = true;

		goto wait;

	} else if (ret <= 0) {

		pr_err("transaction timed out ret=%d\n", ret);

		goto out;

	}

	update_sram_data(chip, &resched_ms);



out:

	schedule_delayed_work(

		&chip->update_sram_data,

		msecs_to_jiffies(resched_ms));
@@ -1965,7 +1986,6 @@ static void update_temp_data(struct work_struct *work) 


	fg_stay_awake(&chip->update_temp_wakeup_source);

	if (chip->sw_rbias_ctrl) {

		reinit_completion(&chip->sram_access_revoked);

		rc = fg_mem_masked_write(chip, EXTERNAL_SENSE_SELECT,

				BATT_TEMP_CNTRL_MASK,

				BATT_TEMP_ON,
@@ -3155,6 +3175,7 @@ static irqreturn_t fg_mem_avail_irq_handler(int irq, void *_chip) 
		if ((fg_debug_mask & FG_IRQS)

				& (FG_MEM_DEBUG_READS | FG_MEM_DEBUG_WRITES))

			pr_info("sram access granted\n");

		reinit_completion(&chip->sram_access_revoked);

		complete_all(&chip->sram_access_granted);

	} else {

		if ((fg_debug_mask & FG_IRQS)
@@ -5196,6 +5217,7 @@ static int fg_probe(struct spmi_device *spmi) 
			fg_cap_learning_alarm_cb);

	init_completion(&chip->sram_access_granted);

	init_completion(&chip->sram_access_revoked);

	complete_all(&chip->sram_access_revoked);

	init_completion(&chip->batt_id_avail);

	dev_set_drvdata(&spmi->dev, chip);
@@ -5398,7 +5420,7 @@ static void check_and_update_sram_data(struct fg_chip *chip) 
		&chip->update_temp_work, msecs_to_jiffies(time_left * 1000));



	next_update_time = chip->last_sram_update_time

		+ (SRAM_PERIOD_UPDATE_MS / 1000);

		+ (fg_sram_update_period_ms / 1000);



	if (next_update_time > current_time)

		time_left = next_update_time - current_time;