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backlight: qcom-wled: Add support for WLED5 peripheral that is present on PM8150L PMICs 

PM8150L WLED supports the following:
    - Two modulators and each sink can use any of the modulator
    - Multiple CABC selection options from which one can be selected/enabled
    - Multiple brightness width selection (12 bits to 15 bits)

Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Subbaraman Narayanamurthy 2020-04-23 21:03:37 +05:30 committed by Lee Jones
parent b85083d162
commit 62a1d3f623
1 changed files with 376 additions and 2 deletions
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378
drivers/video/backlight/qcom-wled.c
View File

@ -15,16 +15,21 @@
/* From DT binding */
#define WLED_MAX_STRINGS 4
#define MOD_A 0
#define MOD_B 1
#define WLED_DEFAULT_BRIGHTNESS 2048
#define WLED_SOFT_START_DLY_US 10000
#define WLED3_SINK_REG_BRIGHT_MAX 0xFFF
#define WLED5_SINK_REG_BRIGHT_MAX_12B 0xFFF
#define WLED5_SINK_REG_BRIGHT_MAX_15B 0x7FFF
/* WLED3/WLED4 control registers */
#define WLED3_CTRL_REG_FAULT_STATUS 0x08
#define WLED3_CTRL_REG_ILIM_FAULT_BIT BIT(0)
#define WLED3_CTRL_REG_OVP_FAULT_BIT BIT(1)
#define WLED4_CTRL_REG_SC_FAULT_BIT BIT(2)
#define WLED5_CTRL_REG_OVP_PRE_ALARM_BIT BIT(4)
#define WLED3_CTRL_REG_INT_RT_STS 0x10
#define WLED3_CTRL_REG_OVP_FAULT_STATUS BIT(1)
@ -40,6 +45,7 @@
#define WLED3_CTRL_REG_OVP 0x4d
#define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0)
#define WLED5_CTRL_REG_OVP_MASK GENMASK(3, 0)
#define WLED3_CTRL_REG_ILIMIT 0x4e
#define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0)
@ -101,6 +107,44 @@
#define WLED4_SINK_REG_BRIGHT(n) (0x57 + (n * 0x10))
/* WLED5 specific control registers */
#define WLED5_CTRL_REG_OVP_INT_CTL 0x5f
#define WLED5_CTRL_REG_OVP_INT_TIMER_MASK GENMASK(2, 0)
/* WLED5 specific sink registers */
#define WLED5_SINK_REG_MOD_A_EN 0x50
#define WLED5_SINK_REG_MOD_B_EN 0x60
#define WLED5_SINK_REG_MOD_EN_MASK BIT(7)
#define WLED5_SINK_REG_MOD_A_SRC_SEL 0x51
#define WLED5_SINK_REG_MOD_B_SRC_SEL 0x61
#define WLED5_SINK_REG_MOD_SRC_SEL_HIGH 0
#define WLED5_SINK_REG_MOD_SRC_SEL_EXT 0x03
#define WLED5_SINK_REG_MOD_SRC_SEL_MASK GENMASK(1, 0)
#define WLED5_SINK_REG_MOD_A_BRIGHTNESS_WIDTH_SEL 0x52
#define WLED5_SINK_REG_MOD_B_BRIGHTNESS_WIDTH_SEL 0x62
#define WLED5_SINK_REG_BRIGHTNESS_WIDTH_12B 0
#define WLED5_SINK_REG_BRIGHTNESS_WIDTH_15B 1
#define WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB 0x53
#define WLED5_SINK_REG_MOD_A_BRIGHTNESS_MSB 0x54
#define WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB 0x63
#define WLED5_SINK_REG_MOD_B_BRIGHTNESS_MSB 0x64
#define WLED5_SINK_REG_MOD_SYNC_BIT 0x65
#define WLED5_SINK_REG_SYNC_MOD_A_BIT BIT(0)
#define WLED5_SINK_REG_SYNC_MOD_B_BIT BIT(1)
#define WLED5_SINK_REG_SYNC_MASK GENMASK(1, 0)
/* WLED5 specific per-'string' registers below */
#define WLED5_SINK_REG_STR_FULL_SCALE_CURR(n) (0x72 + (n * 0x10))
#define WLED5_SINK_REG_STR_SRC_SEL(n) (0x73 + (n * 0x10))
#define WLED5_SINK_REG_SRC_SEL_MOD_A 0
#define WLED5_SINK_REG_SRC_SEL_MOD_B 1
#define WLED5_SINK_REG_SRC_SEL_MASK GENMASK(1, 0)
struct wled_var_cfg {
const u32 *values;
u32 (*fn)(u32);
@ -125,6 +169,8 @@ struct wled_config {
u32 num_strings;
u32 string_i_limit;
u32 enabled_strings[WLED_MAX_STRINGS];
u32 mod_sel;
u32 cabc_sel;
bool cs_out_en;
bool ext_gen;
bool cabc;
@ -150,6 +196,7 @@ struct wled {
u32 version;
bool disabled_by_short;
bool has_short_detect;
bool cabc_disabled;
int short_irq;
int ovp_irq;
@ -222,6 +269,28 @@ static int wled4_set_brightness(struct wled *wled, u16 brightness)
return 0;
}
static int wled5_set_brightness(struct wled *wled, u16 brightness)
{
int rc, offset;
u16 low_limit = wled->max_brightness * 1 / 1000;
u8 v[2];
/* WLED5's lower limit is 0.1% */
if (brightness < low_limit)
brightness = low_limit;
v[0] = brightness & 0xff;
v[1] = (brightness >> 8) & 0x7f;
offset = (wled->cfg.mod_sel == MOD_A) ?
WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB :
WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB;
rc = regmap_bulk_write(wled->regmap, wled->sink_addr + offset,
v, 2);
return rc;
}
static void wled_ovp_work(struct work_struct *work)
{
struct wled *wled = container_of(work,
@ -279,6 +348,24 @@ static int wled3_sync_toggle(struct wled *wled)
return rc;
}
static int wled5_sync_toggle(struct wled *wled)
{
int rc;
u8 val;
val = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_SYNC_MOD_A_BIT :
WLED5_SINK_REG_SYNC_MOD_B_BIT;
rc = regmap_update_bits(wled->regmap,
wled->sink_addr + WLED5_SINK_REG_MOD_SYNC_BIT,
WLED5_SINK_REG_SYNC_MASK, val);
if (rc < 0)
return rc;
return regmap_update_bits(wled->regmap,
wled->sink_addr + WLED5_SINK_REG_MOD_SYNC_BIT,
WLED5_SINK_REG_SYNC_MASK, 0);
}
static int wled_ovp_fault_status(struct wled *wled, bool *fault_set)
{
int rc;
@ -304,7 +391,11 @@ static int wled_ovp_fault_status(struct wled *wled, bool *fault_set)
if (int_rt_sts & WLED3_CTRL_REG_OVP_FAULT_STATUS)
*fault_set = true;
if (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT)
if (wled->version == 4 && (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT))
*fault_set = true;
if (wled->version == 5 && (fault_sts & (WLED3_CTRL_REG_OVP_FAULT_BIT |
WLED5_CTRL_REG_OVP_PRE_ALARM_BIT)))
*fault_set = true;
if (*fault_set)
@ -319,6 +410,26 @@ static int wled4_ovp_delay(struct wled *wled)
return WLED_SOFT_START_DLY_US;
}
static int wled5_ovp_delay(struct wled *wled)
{
int rc, delay_us;
u32 val;
u8 ovp_timer_ms[8] = {1, 2, 4, 8, 12, 16, 20, 24};
/* For WLED5, get the delay based on OVP timer */
rc = regmap_read(wled->regmap, wled->ctrl_addr +
WLED5_CTRL_REG_OVP_INT_CTL, &val);
if (rc < 0)
delay_us =
ovp_timer_ms[val & WLED5_CTRL_REG_OVP_INT_TIMER_MASK] * 1000;
else
delay_us = 2 * WLED_SOFT_START_DLY_US;
dev_dbg(wled->dev, "delay_time_us: %d\n", delay_us);
return delay_us;
}
static int wled_update_status(struct backlight_device *bl)
{
struct wled *wled = bl_get_data(bl);
@ -381,6 +492,31 @@ static int wled4_cabc_config(struct wled *wled, bool enable)
return 0;
}
static int wled5_cabc_config(struct wled *wled, bool enable)
{
int rc, offset;
u8 reg;
if (wled->cabc_disabled)
return 0;
reg = enable ? wled->cfg.cabc_sel : 0;
offset = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_MOD_A_SRC_SEL :
WLED5_SINK_REG_MOD_B_SRC_SEL;
rc = regmap_update_bits(wled->regmap, wled->sink_addr + offset,
WLED5_SINK_REG_MOD_SRC_SEL_MASK, reg);
if (rc < 0) {
pr_err("Error in configuring CABC rc=%d\n", rc);
return rc;
}
if (!wled->cfg.cabc_sel)
wled->cabc_disabled = true;
return 0;
}
#define WLED_SHORT_DLY_MS 20
#define WLED_SHORT_CNT_MAX 5
#define WLED_SHORT_RESET_CNT_DLY_US USEC_PER_SEC
@ -646,6 +782,23 @@ static bool wled4_auto_detection_required(struct wled *wled)
return false;
}
static bool wled5_auto_detection_required(struct wled *wled)
{
if (!wled->cfg.auto_detection_enabled)
return false;
/*
* Unlike WLED4, WLED5 has OVP fault density interrupt configuration
* i.e. to count the number of OVP alarms for a certain duration before
* triggering OVP fault interrupt. By default, number of OVP fault
* events counted before an interrupt is fired is 32 and the time
* interval is 12 ms. If we see one OVP fault interrupt, then that
* should qualify for a real OVP fault condition to run auto detection
* algorithm.
*/
return true;
}
static int wled_auto_detection_at_init(struct wled *wled)
{
int rc;
@ -921,6 +1074,119 @@ static const struct wled_config wled4_config_defaults = {
.auto_detection_enabled = false,
};
static int wled5_setup(struct wled *wled)
{
int rc, temp, i, j, offset;
u8 sink_en = 0;
u16 addr;
u32 val;
rc = regmap_update_bits(wled->regmap,
wled->ctrl_addr + WLED3_CTRL_REG_OVP,
WLED5_CTRL_REG_OVP_MASK, wled->cfg.ovp);
if (rc < 0)
return rc;
rc = regmap_update_bits(wled->regmap,
wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
WLED3_CTRL_REG_ILIMIT_MASK,
wled->cfg.boost_i_limit);
if (rc < 0)
return rc;
rc = regmap_update_bits(wled->regmap,
wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
WLED3_CTRL_REG_FREQ_MASK,
wled->cfg.switch_freq);
if (rc < 0)
return rc;
/* Per sink/string configuration */
for (i = 0; i < wled->cfg.num_strings; ++i) {
j = wled->cfg.enabled_strings[i];
addr = wled->sink_addr +
WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
rc = regmap_update_bits(wled->regmap, addr,
WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
wled->cfg.string_i_limit);
if (rc < 0)
return rc;
addr = wled->sink_addr + WLED5_SINK_REG_STR_SRC_SEL(j);
rc = regmap_update_bits(wled->regmap, addr,
WLED5_SINK_REG_SRC_SEL_MASK,
wled->cfg.mod_sel == MOD_A ?
WLED5_SINK_REG_SRC_SEL_MOD_A :
WLED5_SINK_REG_SRC_SEL_MOD_B);
temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
sink_en |= 1 << temp;
}
rc = wled5_cabc_config(wled, wled->cfg.cabc_sel ? true : false);
if (rc < 0)
return rc;
/* Enable one of the modulators A or B based on mod_sel */
addr = wled->sink_addr + WLED5_SINK_REG_MOD_A_EN;
val = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_MOD_EN_MASK : 0;
rc = regmap_update_bits(wled->regmap, addr,
WLED5_SINK_REG_MOD_EN_MASK, val);
if (rc < 0)
return rc;
addr = wled->sink_addr + WLED5_SINK_REG_MOD_B_EN;
val = (wled->cfg.mod_sel == MOD_B) ? WLED5_SINK_REG_MOD_EN_MASK : 0;
rc = regmap_update_bits(wled->regmap, addr,
WLED5_SINK_REG_MOD_EN_MASK, val);
if (rc < 0)
return rc;
offset = (wled->cfg.mod_sel == MOD_A) ?
WLED5_SINK_REG_MOD_A_BRIGHTNESS_WIDTH_SEL :
WLED5_SINK_REG_MOD_B_BRIGHTNESS_WIDTH_SEL;
addr = wled->sink_addr + offset;
val = (wled->max_brightness == WLED5_SINK_REG_BRIGHT_MAX_15B) ?
WLED5_SINK_REG_BRIGHTNESS_WIDTH_15B :
WLED5_SINK_REG_BRIGHTNESS_WIDTH_12B;
rc = regmap_write(wled->regmap, addr, val);
if (rc < 0)
return rc;
rc = regmap_update_bits(wled->regmap,
wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
if (rc < 0)
return rc;
/* This updates only FSC configuration in WLED5 */
rc = wled->wled_sync_toggle(wled);
if (rc < 0) {
pr_err("Failed to toggle sync reg rc:%d\n", rc);
return rc;
}
rc = wled_auto_detection_at_init(wled);
if (rc < 0)
return rc;
return 0;
}
static const struct wled_config wled5_config_defaults = {
.boost_i_limit = 5,
.string_i_limit = 10,
.ovp = 4,
.num_strings = 4,
.switch_freq = 11,
.mod_sel = 0,
.cabc_sel = 0,
.cabc = false,
.external_pfet = false,
.auto_detection_enabled = false,
};
static const u32 wled3_boost_i_limit_values[] = {
105, 385, 525, 805, 980, 1260, 1400, 1680,
};
@ -939,6 +1205,16 @@ static const struct wled_var_cfg wled4_boost_i_limit_cfg = {
.size = ARRAY_SIZE(wled4_boost_i_limit_values),
};
static inline u32 wled5_boost_i_limit_values_fn(u32 idx)
{
return 525 + (idx * 175);
}
static const struct wled_var_cfg wled5_boost_i_limit_cfg = {
.fn = wled5_boost_i_limit_values_fn,
.size = 8,
};
static const u32 wled3_ovp_values[] = {
35, 32, 29, 27,
};
@ -957,6 +1233,21 @@ static const struct wled_var_cfg wled4_ovp_cfg = {
.size = ARRAY_SIZE(wled4_ovp_values),
};
static inline u32 wled5_ovp_values_fn(u32 idx)
{
/*
* 0000 - 38.5 V
* 0001 - 37 V ..
* 1111 - 16 V
*/
return 38500 - (idx * 1500);
}
static const struct wled_var_cfg wled5_ovp_cfg = {
.fn = wled5_ovp_values_fn,
.size = 16,
};
static u32 wled3_num_strings_values_fn(u32 idx)
{
return idx + 1;
@ -1004,6 +1295,14 @@ static const struct wled_var_cfg wled4_string_cfg = {
.size = 16,
};
static const struct wled_var_cfg wled5_mod_sel_cfg = {
.size = 2,
};
static const struct wled_var_cfg wled5_cabc_sel_cfg = {
.size = 4,
};
static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
{
if (idx >= cfg->size)
@ -1080,6 +1379,44 @@ static int wled_configure(struct wled *wled)
},
};
const struct wled_u32_opts wled5_opts[] = {
{
.name = "qcom,current-boost-limit",
.val_ptr = &cfg->boost_i_limit,
.cfg = &wled5_boost_i_limit_cfg,
},
{
.name = "qcom,current-limit-microamp",
.val_ptr = &cfg->string_i_limit,
.cfg = &wled4_string_i_limit_cfg,
},
{
.name = "qcom,ovp-millivolt",
.val_ptr = &cfg->ovp,
.cfg = &wled5_ovp_cfg,
},
{
.name = "qcom,switching-freq",
.val_ptr = &cfg->switch_freq,
.cfg = &wled3_switch_freq_cfg,
},
{
.name = "qcom,num-strings",
.val_ptr = &cfg->num_strings,
.cfg = &wled4_num_strings_cfg,
},
{
.name = "qcom,modulator-sel",
.val_ptr = &cfg->mod_sel,
.cfg = &wled5_mod_sel_cfg,
},
{
.name = "qcom,cabc-sel",
.val_ptr = &cfg->cabc_sel,
.cfg = &wled5_cabc_sel_cfg,
},
};
const struct wled_bool_opts bool_opts[] = {
{ "qcom,cs-out", &cfg->cs_out_en, },
{ "qcom,ext-gen", &cfg->ext_gen, },
@ -1130,6 +1467,26 @@ static int wled_configure(struct wled *wled)
wled->sink_addr = be32_to_cpu(*prop_addr);
break;
case 5:
u32_opts = wled5_opts;
size = ARRAY_SIZE(wled5_opts);
*cfg = wled5_config_defaults;
wled->wled_set_brightness = wled5_set_brightness;
wled->wled_sync_toggle = wled5_sync_toggle;
wled->wled_cabc_config = wled5_cabc_config;
wled->wled_ovp_delay = wled5_ovp_delay;
wled->wled_auto_detection_required =
wled5_auto_detection_required;
wled->max_string_count = 4;
prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
if (!prop_addr) {
dev_err(wled->dev, "invalid IO resources\n");
return -EINVAL;
}
wled->sink_addr = be32_to_cpu(*prop_addr);
break;
default:
dev_err(wled->dev, "Invalid WLED version\n");
return -EINVAL;
@ -1283,6 +1640,10 @@ static int wled_probe(struct platform_device *pdev)
if (rc)
return rc;
val = WLED3_SINK_REG_BRIGHT_MAX;
of_property_read_u32(pdev->dev.of_node, "max-brightness", &val);
wled->max_brightness = val;
switch (wled->version) {
case 3:
wled->cfg.auto_detection_enabled = false;
@ -1302,6 +1663,18 @@ static int wled_probe(struct platform_device *pdev)
}
break;
case 5:
wled->has_short_detect = true;
if (wled->cfg.cabc_sel)
wled->max_brightness = WLED5_SINK_REG_BRIGHT_MAX_12B;
rc = wled5_setup(wled);
if (rc) {
dev_err(&pdev->dev, "wled5_setup failed\n");
return rc;
}
break;
default:
dev_err(wled->dev, "Invalid WLED version\n");
break;
@ -1323,7 +1696,7 @@ static int wled_probe(struct platform_device *pdev)
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.brightness = val;
props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX;
props.max_brightness = wled->max_brightness;
bl = devm_backlight_device_register(&pdev->dev, wled->name,
&pdev->dev, wled,
&wled_ops, &props);
@ -1346,6 +1719,7 @@ static const struct of_device_id wled_match_table[] = {
{ .compatible = "qcom,pm8941-wled", .data = (void *)3 },
{ .compatible = "qcom,pmi8998-wled", .data = (void *)4 },
{ .compatible = "qcom,pm660l-wled", .data = (void *)4 },
{ .compatible = "qcom,pm8150l-wled", .data = (void *)5 },
{}
};
MODULE_DEVICE_TABLE(of, wled_match_table);