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leds: qti-flash: Update LMH mitigation configuration for qti flash

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Based on the HW recommendation, LMH mitigation needs to
be enabled only when LEDs are used in flash mode with
a total current greater than or equal to 1A.
Update support for the same.

Change-Id: I926a021dc7e864dea402d88d8bb2cf1d6ed580f7
Signed-off-by: Jishnu Prakash <quic_jprakash@quicinc.com>
[quic_subbaram@quicinc.com: Fix trivial merge conflict]
Signed-off-by: Subbaraman Narayanamurthy <quic_subbaram@quicinc.com>
This commit is contained in:
Jishnu Prakash 2021-11-24 11:53:14 +05:30 committed by David Collins
parent 749dacbb8b
commit 17ef00fb6d
1 changed files with 34 additions and 28 deletions
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62
drivers/leds/leds-qti-flash.c
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@ -346,13 +346,18 @@ static int qti_flash_lmh_mitigation_config(struct qti_flash_led *led,
u8 val = enable ? FLASH_LED_LMH_MITIGATION_SW_EN : 0;
int rc;
if (enable == led->trigger_lmh)
return 0;
rc = qti_flash_led_write(led, FLASH_LED_MITIGATION_SW, &val, 1);
if (rc < 0)
if (rc < 0) {
pr_err("Failed to %s LMH mitigation, rc=%d\n",
enable ? "enable" : "disable", rc);
else
} else {
pr_debug("%s LMH mitigation\n",
enable ? "enabled" : "disabled");
led->trigger_lmh = enable;
}
return rc;
}
@ -383,15 +388,6 @@ static int qti_flash_led_strobe(struct qti_flash_led *led,
HRTIMER_MODE_REL);
}
if (led->trigger_lmh) {
rc = qti_flash_lmh_mitigation_config(led, true);
if (rc < 0)
goto error;
/* Wait for LMH mitigation to take effect */
udelay(500);
}
rc = qti_flash_led_masked_write(led, FLASH_EN_LED_CTRL,
mask, value);
if (rc < 0)
@ -411,8 +407,6 @@ static int qti_flash_led_strobe(struct qti_flash_led *led,
rc = qti_flash_lmh_mitigation_config(led, false);
if (rc < 0)
goto error;
led->trigger_lmh = false;
}
rc = qti_flash_led_module_control(led, enable);
@ -680,10 +674,13 @@ static void qti_flash_led_brightness_set(struct led_classdev *led_cdev,
}
}
#define FLASH_LMH_TRIGGER_LIMIT_MA 1000
static int qti_flash_switch_enable(struct flash_switch_data *snode)
{
struct qti_flash_led *led = snode->led;
int rc = 0, i;
int rc = 0, total_curr_ma = 0, i;
enum flash_led_type type = FLASH_LED_TYPE_UNKNOWN;
u8 led_en = 0;
/* If symmetry enabled switch, then turn ON all its LEDs */
@ -706,9 +703,32 @@ static int qti_flash_switch_enable(struct flash_switch_data *snode)
!led->fnode[i].configured)
continue;
/*
* For flash, LMH mitigation needs to be enabled
* if total current used is greater than or
* equal to 1A.
*/
type = led->fnode[i].type;
if (type == FLASH_LED_TYPE_FLASH)
total_curr_ma += led->fnode[i].user_current_ma;
led_en |= (1 << led->fnode[i].id);
}
if (total_curr_ma >= FLASH_LMH_TRIGGER_LIMIT_MA) {
rc = qti_flash_lmh_mitigation_config(led, true);
if (rc < 0)
return rc;
/* Wait for lmh mitigation to take effect */
udelay(500);
} else if (led->trigger_lmh) {
rc = qti_flash_lmh_mitigation_config(led, false);
if (rc < 0)
return rc;
}
return qti_flash_led_strobe(led, snode, snode->led_mask, led_en);
}
@ -957,19 +977,6 @@ static int qti_flash_led_calc_max_avail_current(
voltage_hdrm_mv = qti_flash_led_get_voltage_headroom(led);
vflash_vdip = VDIP_THRESH_DEFAULT_UV;
if (!led->trigger_lmh) {
rc = qti_flash_lmh_mitigation_config(led, true);
if (rc < 0)
return rc;
/* Wait for lmh mitigation to take effect */
udelay(100);
led->trigger_lmh = true;
return qti_flash_led_calc_max_avail_current(led,
max_current_ma);
}
ibatt_safe_ua = DIV_ROUND_CLOSEST((ocv_uv -
(vflash_vdip + VFLASH_DIP_MARGIN_UV)) * UCONV,
rbatt_uohm);
@ -1051,7 +1058,6 @@ static int qti_flash_led_get_max_avail_current(
return 0;
}
led->trigger_lmh = false;
rc = qti_flash_led_calc_max_avail_current(led, max_current_ma);
if (rc < 0) {
pr_err("Failed to calculate max avail current, rc=%d\n", rc);