diff options
| -rw-r--r-- | drivers/video/backlight/qcom-wled.c | 400 |
1 files changed, 394 insertions, 6 deletions
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index 658b1e0a72ec..33b6007c5e55 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -17,19 +17,29 @@ #define WLED_MAX_STRINGS 4 #define WLED_DEFAULT_BRIGHTNESS 2048 - +#define WLED_SOFT_START_DLY_US 10000 #define WLED3_SINK_REG_BRIGHT_MAX 0xFFF /* 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 WLED3_CTRL_REG_INT_RT_STS 0x10 +#define WLED3_CTRL_REG_OVP_FAULT_STATUS BIT(1) + #define WLED3_CTRL_REG_MOD_EN 0x46 #define WLED3_CTRL_REG_MOD_EN_MASK BIT(7) #define WLED3_CTRL_REG_MOD_EN_SHIFT 7 +#define WLED3_CTRL_REG_FEEDBACK_CONTROL 0x48 + #define WLED3_CTRL_REG_FREQ 0x4c #define WLED3_CTRL_REG_FREQ_MASK GENMASK(3, 0) #define WLED3_CTRL_REG_OVP 0x4d -#define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0) +#define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0) #define WLED3_CTRL_REG_ILIMIT 0x4e #define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0) @@ -119,6 +129,7 @@ struct wled_config { bool ext_gen; bool cabc; bool external_pfet; + bool auto_detection_enabled; }; struct wled { @@ -127,17 +138,22 @@ struct wled { struct regmap *regmap; struct mutex lock; /* Lock to avoid race from thread irq handler */ ktime_t last_short_event; + ktime_t start_ovp_fault_time; u16 ctrl_addr; u16 sink_addr; u16 max_string_count; + u16 auto_detection_ovp_count; u32 brightness; u32 max_brightness; u32 short_count; + u32 auto_detect_count; bool disabled_by_short; bool has_short_detect; int short_irq; + int ovp_irq; struct wled_config cfg; + struct delayed_work ovp_work; int (*wled_set_brightness)(struct wled *wled, u16 brightness); }; @@ -182,6 +198,13 @@ static int wled4_set_brightness(struct wled *wled, u16 brightness) return 0; } +static void wled_ovp_work(struct work_struct *work) +{ + struct wled *wled = container_of(work, + struct wled, ovp_work.work); + enable_irq(wled->ovp_irq); +} + static int wled_module_enable(struct wled *wled, int val) { int rc; @@ -193,7 +216,25 @@ static int wled_module_enable(struct wled *wled, int val) WLED3_CTRL_REG_MOD_EN, WLED3_CTRL_REG_MOD_EN_MASK, val << WLED3_CTRL_REG_MOD_EN_SHIFT); - return rc; + if (rc < 0) + return rc; + + if (wled->ovp_irq > 0) { + if (val) { + /* + * The hardware generates a storm of spurious OVP + * interrupts during soft start operations. So defer + * enabling the IRQ for 10ms to ensure that the + * soft start is complete. + */ + schedule_delayed_work(&wled->ovp_work, HZ / 100); + } else { + if (!cancel_delayed_work_sync(&wled->ovp_work)) + disable_irq(wled->ovp_irq); + } + } + + return 0; } static int wled_sync_toggle(struct wled *wled) @@ -300,6 +341,304 @@ unlock_mutex: return IRQ_HANDLED; } +#define AUTO_DETECT_BRIGHTNESS 200 + +static void wled_auto_string_detection(struct wled *wled) +{ + int rc = 0, i; + u32 sink_config = 0, int_sts; + u8 sink_test = 0, sink_valid = 0, val; + + /* Read configured sink configuration */ + rc = regmap_read(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_CURR_SINK, &sink_config); + if (rc < 0) { + dev_err(wled->dev, "Failed to read SINK configuration rc=%d\n", + rc); + goto failed_detect; + } + + /* Disable the module before starting detection */ + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, 0); + if (rc < 0) { + dev_err(wled->dev, "Failed to disable WLED module rc=%d\n", rc); + goto failed_detect; + } + + /* Set low brightness across all sinks */ + rc = wled4_set_brightness(wled, AUTO_DETECT_BRIGHTNESS); + if (rc < 0) { + dev_err(wled->dev, "Failed to set brightness for auto detection rc=%d\n", + rc); + goto failed_detect; + } + + if (wled->cfg.cabc) { + for (i = 0; i < wled->cfg.num_strings; i++) { + rc = regmap_update_bits(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_STR_CABC(i), + WLED4_SINK_REG_STR_CABC_MASK, + 0); + if (rc < 0) + goto failed_detect; + } + } + + /* Disable all sinks */ + rc = regmap_write(wled->regmap, + wled->sink_addr + WLED4_SINK_REG_CURR_SINK, 0); + if (rc < 0) { + dev_err(wled->dev, "Failed to disable all sinks rc=%d\n", rc); + goto failed_detect; + } + + /* Iterate through the strings one by one */ + for (i = 0; i < wled->cfg.num_strings; i++) { + sink_test = BIT((WLED4_SINK_REG_CURR_SINK_SHFT + i)); + + /* Enable feedback control */ + rc = regmap_write(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_FEEDBACK_CONTROL, i + 1); + if (rc < 0) { + dev_err(wled->dev, "Failed to enable feedback for SINK %d rc = %d\n", + i + 1, rc); + goto failed_detect; + } + + /* Enable the sink */ + rc = regmap_write(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_CURR_SINK, sink_test); + if (rc < 0) { + dev_err(wled->dev, "Failed to configure SINK %d rc=%d\n", + i + 1, rc); + goto failed_detect; + } + + /* Enable the module */ + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, + WLED3_CTRL_REG_MOD_EN_MASK); + if (rc < 0) { + dev_err(wled->dev, "Failed to enable WLED module rc=%d\n", + rc); + goto failed_detect; + } + + usleep_range(WLED_SOFT_START_DLY_US, + WLED_SOFT_START_DLY_US + 1000); + + rc = regmap_read(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_INT_RT_STS, &int_sts); + if (rc < 0) { + dev_err(wled->dev, "Error in reading WLED3_CTRL_INT_RT_STS rc=%d\n", + rc); + goto failed_detect; + } + + if (int_sts & WLED3_CTRL_REG_OVP_FAULT_STATUS) + dev_dbg(wled->dev, "WLED OVP fault detected with SINK %d\n", + i + 1); + else + sink_valid |= sink_test; + + /* Disable the module */ + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, 0); + if (rc < 0) { + dev_err(wled->dev, "Failed to disable WLED module rc=%d\n", + rc); + goto failed_detect; + } + } + + if (!sink_valid) { + dev_err(wled->dev, "No valid WLED sinks found\n"); + wled->disabled_by_short = true; + goto failed_detect; + } + + if (sink_valid != sink_config) { + dev_warn(wled->dev, "%x is not a valid sink configuration - using %x instead\n", + sink_config, sink_valid); + sink_config = sink_valid; + } + + /* Write the new sink configuration */ + rc = regmap_write(wled->regmap, + wled->sink_addr + WLED4_SINK_REG_CURR_SINK, + sink_config); + if (rc < 0) { + dev_err(wled->dev, "Failed to reconfigure the default sink rc=%d\n", + rc); + goto failed_detect; + } + + /* Enable valid sinks */ + for (i = 0; i < wled->cfg.num_strings; i++) { + if (wled->cfg.cabc) { + rc = regmap_update_bits(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_STR_CABC(i), + WLED4_SINK_REG_STR_CABC_MASK, + WLED4_SINK_REG_STR_CABC_MASK); + if (rc < 0) + goto failed_detect; + } + + if (sink_config & BIT(WLED4_SINK_REG_CURR_SINK_SHFT + i)) + val = WLED4_SINK_REG_STR_MOD_MASK; + else + val = 0x0; /* Disable modulator_en for unused sink */ + + rc = regmap_write(wled->regmap, wled->sink_addr + + WLED4_SINK_REG_STR_MOD_EN(i), val); + if (rc < 0) { + dev_err(wled->dev, "Failed to configure MODULATOR_EN rc=%d\n", + rc); + goto failed_detect; + } + } + + /* Restore the feedback setting */ + rc = regmap_write(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_FEEDBACK_CONTROL, 0); + if (rc < 0) { + dev_err(wled->dev, "Failed to restore feedback setting rc=%d\n", + rc); + goto failed_detect; + } + + /* Restore brightness */ + rc = wled4_set_brightness(wled, wled->brightness); + if (rc < 0) { + dev_err(wled->dev, "Failed to set brightness after auto detection rc=%d\n", + rc); + goto failed_detect; + } + + rc = regmap_update_bits(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN, + WLED3_CTRL_REG_MOD_EN_MASK, + WLED3_CTRL_REG_MOD_EN_MASK); + if (rc < 0) { + dev_err(wled->dev, "Failed to enable WLED module rc=%d\n", rc); + goto failed_detect; + } + +failed_detect: + return; +} + +#define WLED_AUTO_DETECT_OVP_COUNT 5 +#define WLED_AUTO_DETECT_CNT_DLY_US USEC_PER_SEC +static bool wled_auto_detection_required(struct wled *wled) +{ + s64 elapsed_time_us; + + if (!wled->cfg.auto_detection_enabled) + return false; + + /* + * Check if the OVP fault was an occasional one + * or if it's firing continuously, the latter qualifies + * for an auto-detection check. + */ + if (!wled->auto_detection_ovp_count) { + wled->start_ovp_fault_time = ktime_get(); + wled->auto_detection_ovp_count++; + } else { + elapsed_time_us = ktime_us_delta(ktime_get(), + wled->start_ovp_fault_time); + if (elapsed_time_us > WLED_AUTO_DETECT_CNT_DLY_US) + wled->auto_detection_ovp_count = 0; + else + wled->auto_detection_ovp_count++; + + if (wled->auto_detection_ovp_count >= + WLED_AUTO_DETECT_OVP_COUNT) { + wled->auto_detection_ovp_count = 0; + return true; + } + } + + return false; +} + +static int wled_auto_detection_at_init(struct wled *wled) +{ + int rc; + u32 fault_status, rt_status; + + if (!wled->cfg.auto_detection_enabled) + return 0; + + rc = regmap_read(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS, + &rt_status); + if (rc < 0) { + dev_err(wled->dev, "Failed to read RT status rc=%d\n", rc); + return rc; + } + + rc = regmap_read(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_FAULT_STATUS, + &fault_status); + if (rc < 0) { + dev_err(wled->dev, "Failed to read fault status rc=%d\n", rc); + return rc; + } + + if ((rt_status & WLED3_CTRL_REG_OVP_FAULT_STATUS) || + (fault_status & WLED3_CTRL_REG_OVP_FAULT_BIT)) { + mutex_lock(&wled->lock); + wled_auto_string_detection(wled); + mutex_unlock(&wled->lock); + } + + return rc; +} + +static irqreturn_t wled_ovp_irq_handler(int irq, void *_wled) +{ + struct wled *wled = _wled; + int rc; + u32 int_sts, fault_sts; + + rc = regmap_read(wled->regmap, + wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS, &int_sts); + if (rc < 0) { + dev_err(wled->dev, "Error in reading WLED3_INT_RT_STS rc=%d\n", + rc); + return IRQ_HANDLED; + } + + rc = regmap_read(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_FAULT_STATUS, &fault_sts); + if (rc < 0) { + dev_err(wled->dev, "Error in reading WLED_FAULT_STATUS rc=%d\n", + rc); + return IRQ_HANDLED; + } + + if (fault_sts & (WLED3_CTRL_REG_OVP_FAULT_BIT | + WLED3_CTRL_REG_ILIM_FAULT_BIT)) + dev_dbg(wled->dev, "WLED OVP fault detected, int_sts=%x fault_sts= %x\n", + int_sts, fault_sts); + + if (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT) { + if (wled_auto_detection_required(wled)) { + mutex_lock(&wled->lock); + wled_auto_string_detection(wled); + mutex_unlock(&wled->lock); + } + } + + return IRQ_HANDLED; +} + static int wled3_setup(struct wled *wled) { u16 addr; @@ -436,8 +775,10 @@ static int wled4_setup(struct wled *wled) sink_en |= 1 << temp; } - if (sink_cfg == sink_en) - return 0; + if (sink_cfg == sink_en) { + rc = wled_auto_detection_at_init(wled); + return rc; + } rc = regmap_update_bits(wled->regmap, wled->sink_addr + WLED4_SINK_REG_CURR_SINK, @@ -500,7 +841,9 @@ static int wled4_setup(struct wled *wled) return rc; } - return 0; + rc = wled_auto_detection_at_init(wled); + + return rc; } static const struct wled_config wled4_config_defaults = { @@ -511,6 +854,7 @@ static const struct wled_config wled4_config_defaults = { .switch_freq = 11, .cabc = false, .external_pfet = false, + .auto_detection_enabled = false, }; static const u32 wled3_boost_i_limit_values[] = { @@ -677,6 +1021,7 @@ static int wled_configure(struct wled *wled, int version) { "qcom,ext-gen", &cfg->ext_gen, }, { "qcom,cabc", &cfg->cabc, }, { "qcom,external-pfet", &cfg->external_pfet, }, + { "qcom,auto-string-detection", &cfg->auto_detection_enabled, }, }; prop_addr = of_get_address(dev->of_node, 0, NULL, NULL); @@ -797,6 +1142,40 @@ static int wled_configure_short_irq(struct wled *wled, return rc; } +static int wled_configure_ovp_irq(struct wled *wled, + struct platform_device *pdev) +{ + int rc; + u32 val; + + wled->ovp_irq = platform_get_irq_byname(pdev, "ovp"); + if (wled->ovp_irq < 0) { + dev_dbg(&pdev->dev, "OVP IRQ not found - disabling automatic string detection\n"); + return 0; + } + + rc = devm_request_threaded_irq(wled->dev, wled->ovp_irq, NULL, + wled_ovp_irq_handler, IRQF_ONESHOT, + "wled_ovp_irq", wled); + if (rc < 0) { + dev_err(wled->dev, "Unable to request ovp_irq (err:%d)\n", + rc); + wled->ovp_irq = 0; + return 0; + } + + rc = regmap_read(wled->regmap, wled->ctrl_addr + + WLED3_CTRL_REG_MOD_EN, &val); + if (rc < 0) + return rc; + + /* Keep OVP irq disabled until module is enabled */ + if (!(val & WLED3_CTRL_REG_MOD_EN_MASK)) + disable_irq(wled->ovp_irq); + + return 0; +} + static const struct backlight_ops wled_ops = { .update_status = wled_update_status, }; @@ -837,6 +1216,7 @@ static int wled_probe(struct platform_device *pdev) switch (version) { case 3: + wled->cfg.auto_detection_enabled = false; rc = wled3_setup(wled); if (rc) { dev_err(&pdev->dev, "wled3_setup failed\n"); @@ -858,10 +1238,16 @@ static int wled_probe(struct platform_device *pdev) break; } + INIT_DELAYED_WORK(&wled->ovp_work, wled_ovp_work); + rc = wled_configure_short_irq(wled, pdev); if (rc < 0) return rc; + rc = wled_configure_ovp_irq(wled, pdev); + if (rc < 0) + return rc; + val = WLED_DEFAULT_BRIGHTNESS; of_property_read_u32(pdev->dev.of_node, "default-brightness", &val); @@ -880,7 +1266,9 @@ static int wled_remove(struct platform_device *pdev) struct wled *wled = dev_get_drvdata(&pdev->dev); mutex_destroy(&wled->lock); + cancel_delayed_work_sync(&wled->ovp_work); disable_irq(wled->short_irq); + disable_irq(wled->ovp_irq); return 0; } |