| Message ID | 1525342352-25072-4-git-send-email-kgunda@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, May 03, 2018 at 03:42:30PM +0530, Kiran Gunda wrote: > Handle the short circuit interrupt and check if the short circuit > interrupt is valid. Re-enable the module to check if it goes > away. Disable the module altogether if the short circuit event > persists. > > Signed-off-by: Kiran Gunda <kgunda@codeaurora.org> > --- > drivers/video/backlight/qcom-wled.c | 134 ++++++++++++++++++++++++++++++++++-- > 1 file changed, 130 insertions(+), 4 deletions(-) > > diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c > index be8b8d3..2cfba77 100644 > --- a/drivers/video/backlight/qcom-wled.c > +++ b/drivers/video/backlight/qcom-wled.c > @@ -10,6 +10,9 @@ > * GNU General Public License for more details. > */ > > +#include <linux/delay.h> > +#include <linux/interrupt.h> > +#include <linux/ktime.h> > #include <linux/kernel.h> > #include <linux/backlight.h> > #include <linux/module.h> > @@ -23,7 +26,9 @@ > > #define WLED3_SINK_REG_BRIGHT_MAX 0xFFF > > -/* Control registers */ > +/* WLED3 Control registers */ > +#define WLED3_CTRL_REG_FAULT_STATUS 0x08 > + > #define WLED3_CTRL_REG_MOD_EN 0x46 > #define WLED3_CTRL_REG_MOD_EN_MASK BIT(7) > > @@ -36,7 +41,17 @@ > #define WLED3_CTRL_REG_ILIMIT 0x4e > #define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0) > > -/* sink registers */ > +/* WLED4 control registers */ > +#define WLED4_CTRL_REG_SHORT_PROTECT 0x5e > +#define WLED4_CTRL_REG_SHORT_EN_MASK BIT(7) > + > +#define WLED4_CTRL_REG_SEC_ACCESS 0xd0 > +#define WLED4_CTRL_REG_SEC_UNLOCK 0xa5 > + > +#define WLED4_CTRL_REG_TEST1 0xe2 > +#define WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2 0x09 > + > +/* WLED3 sink registers */ > #define WLED3_SINK_REG_SYNC 0x47 > #define WLED3_SINK_REG_SYNC_MASK GENMASK(2, 0) > #define WLED4_SINK_REG_SYNC_MASK GENMASK(3, 0) > @@ -130,17 +145,23 @@ struct wled_config { > bool cs_out_en; > bool ext_gen; > bool cabc; > + bool external_pfet; > }; > > struct wled { > const char *name; > struct device *dev; > struct regmap *regmap; > + struct mutex lock; /* Lock to avoid race from ISR */ > + ktime_t last_short_event; > u16 ctrl_addr; > u16 sink_addr; > u32 brightness; > u32 max_brightness; > + u32 short_count; > const int *version; > + int short_irq; > + bool force_mod_disable; > > struct wled_config cfg; > int (*wled_set_brightness)(struct wled *wled, u16 brightness); > @@ -192,6 +213,9 @@ static int wled_module_enable(struct wled *wled, int val) > { > int rc; > > + if (wled->force_mod_disable) > + return 0; > + > rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + > WLED3_CTRL_REG_MOD_EN, > WLED3_CTRL_REG_MOD_EN_MASK, > @@ -248,12 +272,13 @@ static int wled_update_status(struct backlight_device *bl) > bl->props.state & BL_CORE_FBBLANK) > brightness = 0; > > + mutex_lock(&wled->lock); > if (brightness) { > rc = wled->wled_set_brightness(wled, brightness); > if (rc < 0) { > dev_err(wled->dev, "wled failed to set brightness rc:%d\n", > rc); > - return rc; > + goto unlock_mutex; > } > > rc = wled->wled_sync_toggle(wled); > @@ -267,15 +292,60 @@ static int wled_update_status(struct backlight_device *bl) > rc = wled_module_enable(wled, !!brightness); > if (rc < 0) { > dev_err(wled->dev, "wled enable failed rc:%d\n", rc); > - return rc; > + goto unlock_mutex; > } > } > > wled->brightness = brightness; > > +unlock_mutex: > + mutex_unlock(&wled->lock); > + > return rc; > } > > +#define WLED_SHORT_DLY_MS 20 > +#define WLED_SHORT_CNT_MAX 5 > +#define WLED_SHORT_RESET_CNT_DLY_US HZ So we think a short report every quarter second is harmless? > +static irqreturn_t wled_short_irq_handler(int irq, void *_wled) > +{ > + struct wled *wled = _wled; > + int rc; > + s64 elapsed_time; > + > + wled->short_count++; > + mutex_lock(&wled->lock); > + rc = wled_module_enable(wled, false); > + if (rc < 0) { > + dev_err(wled->dev, "wled disable failed rc:%d\n", rc); > + goto unlock_mutex; > + } > + > + elapsed_time = ktime_us_delta(ktime_get(), > + wled->last_short_event); > + if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US) > + wled->short_count = 0; > + > + if (wled->short_count > WLED_SHORT_CNT_MAX) { > + dev_err(wled->dev, "Short trigged %d times, disabling WLED forever!\n", > + wled->short_count); > + wled->force_mod_disable = true; > + goto unlock_mutex; > + } > + > + wled->last_short_event = ktime_get(); > + > + msleep(WLED_SHORT_DLY_MS); > + rc = wled_module_enable(wled, true); > + if (rc < 0) > + dev_err(wled->dev, "wled enable failed rc:%d\n", rc); > + > +unlock_mutex: > + mutex_unlock(&wled->lock); > + > + return IRQ_HANDLED; > +} > + > static int wled3_setup(struct wled *wled) > { > u16 addr; > @@ -435,6 +505,21 @@ static int wled4_setup(struct wled *wled) > return rc; > } > > + if (wled->cfg.external_pfet) { > + /* Unlock the secure register access */ > + rc = regmap_write(wled->regmap, wled->ctrl_addr + > + WLED4_CTRL_REG_SEC_ACCESS, > + WLED4_CTRL_REG_SEC_UNLOCK); > + if (rc < 0) > + return rc; > + > + rc = regmap_write(wled->regmap, > + wled->ctrl_addr + WLED4_CTRL_REG_TEST1, > + WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2); > + if (rc < 0) > + return rc; > + } > + > return 0; > } > > @@ -446,6 +531,7 @@ static int wled4_setup(struct wled *wled) > .switch_freq = 11, > .enabled_strings = 0xf, > .cabc = false, > + .external_pfet = true, > }; > > static const u32 wled3_boost_i_limit_values[] = { > @@ -628,6 +714,7 @@ static int wled_configure(struct wled *wled) > { "qcom,cs-out", &cfg->cs_out_en, }, > { "qcom,ext-gen", &cfg->ext_gen, }, > { "qcom,cabc", &cfg->cabc, }, > + { "qcom,external-pfet", &cfg->external_pfet, }, > }; > > prop_addr = of_get_address(dev->of_node, 0, NULL, NULL); > @@ -701,6 +788,39 @@ static int wled_configure(struct wled *wled) > return 0; > } > > +static int wled_configure_short_irq(struct wled *wled, > + struct platform_device *pdev) > +{ > + int rc = 0; > + > + /* PM8941 doesn't have the short detection support */ > + if (*wled->version == WLED_PM8941) > + return 0; > + > + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + > + WLED4_CTRL_REG_SHORT_PROTECT, > + WLED4_CTRL_REG_SHORT_EN_MASK, > + WLED4_CTRL_REG_SHORT_EN_MASK); > + if (rc < 0) > + return rc; > + > + wled->short_irq = platform_get_irq_byname(pdev, "short"); > + if (wled->short_irq < 0) { > + dev_dbg(&pdev->dev, "short irq is not used\n"); > + return 0; > + } > + > + rc = devm_request_threaded_irq(wled->dev, wled->short_irq, > + NULL, wled_short_irq_handler, NULL? There's no register we can check to make sure the interrupt handler did not enter spuriously? > + IRQF_ONESHOT, > + "wled_short_irq", wled); > + if (rc < 0) > + dev_err(wled->dev, "Unable to request short_irq (err:%d)\n", > + rc); > + > + return rc; > +} > + > static const struct backlight_ops wled_ops = { > .update_status = wled_update_status, > }; > @@ -733,6 +853,8 @@ static int wled_probe(struct platform_device *pdev) > return -ENODEV; > } > > + mutex_init(&wled->lock); > + > rc = wled_configure(wled); > if (rc) > return rc; > @@ -752,6 +874,10 @@ static int wled_probe(struct platform_device *pdev) > } > } > > + rc = wled_configure_short_irq(wled, pdev); > + if (rc < 0) > + return rc; > + > val = WLED_DEFAULT_BRIGHTNESS; > of_property_read_u32(pdev->dev.of_node, "default-brightness", &val); > > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project > -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2018-05-08 16:05, Daniel Thompson wrote: > On Thu, May 03, 2018 at 03:42:30PM +0530, Kiran Gunda wrote: >> Handle the short circuit interrupt and check if the short circuit >> interrupt is valid. Re-enable the module to check if it goes >> away. Disable the module altogether if the short circuit event >> persists. >> >> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org> >> --- >> drivers/video/backlight/qcom-wled.c | 134 >> ++++++++++++++++++++++++++++++++++-- >> 1 file changed, 130 insertions(+), 4 deletions(-) >> >> diff --git a/drivers/video/backlight/qcom-wled.c >> b/drivers/video/backlight/qcom-wled.c >> index be8b8d3..2cfba77 100644 >> --- a/drivers/video/backlight/qcom-wled.c >> +++ b/drivers/video/backlight/qcom-wled.c >> @@ -10,6 +10,9 @@ >> * GNU General Public License for more details. >> */ >> >> +#include <linux/delay.h> >> +#include <linux/interrupt.h> >> +#include <linux/ktime.h> >> #include <linux/kernel.h> >> #include <linux/backlight.h> >> #include <linux/module.h> >> @@ -23,7 +26,9 @@ >> >> #define WLED3_SINK_REG_BRIGHT_MAX 0xFFF >> >> -/* Control registers */ >> +/* WLED3 Control registers */ >> +#define WLED3_CTRL_REG_FAULT_STATUS 0x08 >> + >> #define WLED3_CTRL_REG_MOD_EN 0x46 >> #define WLED3_CTRL_REG_MOD_EN_MASK BIT(7) >> >> @@ -36,7 +41,17 @@ >> #define WLED3_CTRL_REG_ILIMIT 0x4e >> #define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0) >> >> -/* sink registers */ >> +/* WLED4 control registers */ >> +#define WLED4_CTRL_REG_SHORT_PROTECT 0x5e >> +#define WLED4_CTRL_REG_SHORT_EN_MASK BIT(7) >> + >> +#define WLED4_CTRL_REG_SEC_ACCESS 0xd0 >> +#define WLED4_CTRL_REG_SEC_UNLOCK 0xa5 >> + >> +#define WLED4_CTRL_REG_TEST1 0xe2 >> +#define WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2 0x09 >> + >> +/* WLED3 sink registers */ >> #define WLED3_SINK_REG_SYNC 0x47 >> #define WLED3_SINK_REG_SYNC_MASK GENMASK(2, 0) >> #define WLED4_SINK_REG_SYNC_MASK GENMASK(3, 0) >> @@ -130,17 +145,23 @@ struct wled_config { >> bool cs_out_en; >> bool ext_gen; >> bool cabc; >> + bool external_pfet; >> }; >> >> struct wled { >> const char *name; >> struct device *dev; >> struct regmap *regmap; >> + struct mutex lock; /* Lock to avoid race from ISR */ >> + ktime_t last_short_event; >> u16 ctrl_addr; >> u16 sink_addr; >> u32 brightness; >> u32 max_brightness; >> + u32 short_count; >> const int *version; >> + int short_irq; >> + bool force_mod_disable; >> >> struct wled_config cfg; >> int (*wled_set_brightness)(struct wled *wled, u16 brightness); >> @@ -192,6 +213,9 @@ static int wled_module_enable(struct wled *wled, >> int val) >> { >> int rc; >> >> + if (wled->force_mod_disable) >> + return 0; >> + >> rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + >> WLED3_CTRL_REG_MOD_EN, >> WLED3_CTRL_REG_MOD_EN_MASK, >> @@ -248,12 +272,13 @@ static int wled_update_status(struct >> backlight_device *bl) >> bl->props.state & BL_CORE_FBBLANK) >> brightness = 0; >> >> + mutex_lock(&wled->lock); >> if (brightness) { >> rc = wled->wled_set_brightness(wled, brightness); >> if (rc < 0) { >> dev_err(wled->dev, "wled failed to set brightness rc:%d\n", >> rc); >> - return rc; >> + goto unlock_mutex; >> } >> >> rc = wled->wled_sync_toggle(wled); >> @@ -267,15 +292,60 @@ static int wled_update_status(struct >> backlight_device *bl) >> rc = wled_module_enable(wled, !!brightness); >> if (rc < 0) { >> dev_err(wled->dev, "wled enable failed rc:%d\n", rc); >> - return rc; >> + goto unlock_mutex; >> } >> } >> >> wled->brightness = brightness; >> >> +unlock_mutex: >> + mutex_unlock(&wled->lock); >> + >> return rc; >> } >> >> +#define WLED_SHORT_DLY_MS 20 >> +#define WLED_SHORT_CNT_MAX 5 >> +#define WLED_SHORT_RESET_CNT_DLY_US HZ > > So we think a short report every quarter second is harmless? > > Yes. We wait for the short to report 5 times with in this time. If the short still persists, we go and disable the WLED module to avoid the damage. This is suggested by the HW team. >> +static irqreturn_t wled_short_irq_handler(int irq, void *_wled) >> +{ >> + struct wled *wled = _wled; >> + int rc; >> + s64 elapsed_time; >> + >> + wled->short_count++; >> + mutex_lock(&wled->lock); >> + rc = wled_module_enable(wled, false); >> + if (rc < 0) { >> + dev_err(wled->dev, "wled disable failed rc:%d\n", rc); >> + goto unlock_mutex; >> + } >> + >> + elapsed_time = ktime_us_delta(ktime_get(), >> + wled->last_short_event); >> + if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US) >> + wled->short_count = 0; >> + >> + if (wled->short_count > WLED_SHORT_CNT_MAX) { >> + dev_err(wled->dev, "Short trigged %d times, disabling WLED >> forever!\n", >> + wled->short_count); >> + wled->force_mod_disable = true; >> + goto unlock_mutex; >> + } >> + >> + wled->last_short_event = ktime_get(); >> + >> + msleep(WLED_SHORT_DLY_MS); >> + rc = wled_module_enable(wled, true); >> + if (rc < 0) >> + dev_err(wled->dev, "wled enable failed rc:%d\n", rc); >> + >> +unlock_mutex: >> + mutex_unlock(&wled->lock); >> + >> + return IRQ_HANDLED; >> +} >> + >> static int wled3_setup(struct wled *wled) >> { >> u16 addr; >> @@ -435,6 +505,21 @@ static int wled4_setup(struct wled *wled) >> return rc; >> } >> >> + if (wled->cfg.external_pfet) { >> + /* Unlock the secure register access */ >> + rc = regmap_write(wled->regmap, wled->ctrl_addr + >> + WLED4_CTRL_REG_SEC_ACCESS, >> + WLED4_CTRL_REG_SEC_UNLOCK); >> + if (rc < 0) >> + return rc; >> + >> + rc = regmap_write(wled->regmap, >> + wled->ctrl_addr + WLED4_CTRL_REG_TEST1, >> + WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2); >> + if (rc < 0) >> + return rc; >> + } >> + >> return 0; >> } >> >> @@ -446,6 +531,7 @@ static int wled4_setup(struct wled *wled) >> .switch_freq = 11, >> .enabled_strings = 0xf, >> .cabc = false, >> + .external_pfet = true, >> }; >> >> static const u32 wled3_boost_i_limit_values[] = { >> @@ -628,6 +714,7 @@ static int wled_configure(struct wled *wled) >> { "qcom,cs-out", &cfg->cs_out_en, }, >> { "qcom,ext-gen", &cfg->ext_gen, }, >> { "qcom,cabc", &cfg->cabc, }, >> + { "qcom,external-pfet", &cfg->external_pfet, }, >> }; >> >> prop_addr = of_get_address(dev->of_node, 0, NULL, NULL); >> @@ -701,6 +788,39 @@ static int wled_configure(struct wled *wled) >> return 0; >> } >> >> +static int wled_configure_short_irq(struct wled *wled, >> + struct platform_device *pdev) >> +{ >> + int rc = 0; >> + >> + /* PM8941 doesn't have the short detection support */ >> + if (*wled->version == WLED_PM8941) >> + return 0; >> + >> + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + >> + WLED4_CTRL_REG_SHORT_PROTECT, >> + WLED4_CTRL_REG_SHORT_EN_MASK, >> + WLED4_CTRL_REG_SHORT_EN_MASK); >> + if (rc < 0) >> + return rc; >> + >> + wled->short_irq = platform_get_irq_byname(pdev, "short"); >> + if (wled->short_irq < 0) { >> + dev_dbg(&pdev->dev, "short irq is not used\n"); >> + return 0; >> + } >> + >> + rc = devm_request_threaded_irq(wled->dev, wled->short_irq, >> + NULL, wled_short_irq_handler, > > NULL? There's no register we can check to make sure the interrupt > handler did not enter spuriously? > > There is FAULT_STATUS register. I will address it in the next series. >> + IRQF_ONESHOT, >> + "wled_short_irq", wled); >> + if (rc < 0) >> + dev_err(wled->dev, "Unable to request short_irq (err:%d)\n", >> + rc); >> + >> + return rc; >> +} >> + >> static const struct backlight_ops wled_ops = { >> .update_status = wled_update_status, >> }; >> @@ -733,6 +853,8 @@ static int wled_probe(struct platform_device >> *pdev) >> return -ENODEV; >> } >> >> + mutex_init(&wled->lock); >> + >> rc = wled_configure(wled); >> if (rc) >> return rc; >> @@ -752,6 +874,10 @@ static int wled_probe(struct platform_device >> *pdev) >> } >> } >> >> + rc = wled_configure_short_irq(wled, pdev); >> + if (rc < 0) >> + return rc; >> + >> val = WLED_DEFAULT_BRIGHTNESS; >> of_property_read_u32(pdev->dev.of_node, "default-brightness", &val); >> >> -- >> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora >> Forum, >> a Linux Foundation Collaborative Project >> -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index be8b8d3..2cfba77 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -10,6 +10,9 @@ * GNU General Public License for more details. */ +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/ktime.h> #include <linux/kernel.h> #include <linux/backlight.h> #include <linux/module.h> @@ -23,7 +26,9 @@ #define WLED3_SINK_REG_BRIGHT_MAX 0xFFF -/* Control registers */ +/* WLED3 Control registers */ +#define WLED3_CTRL_REG_FAULT_STATUS 0x08 + #define WLED3_CTRL_REG_MOD_EN 0x46 #define WLED3_CTRL_REG_MOD_EN_MASK BIT(7) @@ -36,7 +41,17 @@ #define WLED3_CTRL_REG_ILIMIT 0x4e #define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0) -/* sink registers */ +/* WLED4 control registers */ +#define WLED4_CTRL_REG_SHORT_PROTECT 0x5e +#define WLED4_CTRL_REG_SHORT_EN_MASK BIT(7) + +#define WLED4_CTRL_REG_SEC_ACCESS 0xd0 +#define WLED4_CTRL_REG_SEC_UNLOCK 0xa5 + +#define WLED4_CTRL_REG_TEST1 0xe2 +#define WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2 0x09 + +/* WLED3 sink registers */ #define WLED3_SINK_REG_SYNC 0x47 #define WLED3_SINK_REG_SYNC_MASK GENMASK(2, 0) #define WLED4_SINK_REG_SYNC_MASK GENMASK(3, 0) @@ -130,17 +145,23 @@ struct wled_config { bool cs_out_en; bool ext_gen; bool cabc; + bool external_pfet; }; struct wled { const char *name; struct device *dev; struct regmap *regmap; + struct mutex lock; /* Lock to avoid race from ISR */ + ktime_t last_short_event; u16 ctrl_addr; u16 sink_addr; u32 brightness; u32 max_brightness; + u32 short_count; const int *version; + int short_irq; + bool force_mod_disable; struct wled_config cfg; int (*wled_set_brightness)(struct wled *wled, u16 brightness); @@ -192,6 +213,9 @@ static int wled_module_enable(struct wled *wled, int val) { int rc; + if (wled->force_mod_disable) + return 0; + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN, WLED3_CTRL_REG_MOD_EN_MASK, @@ -248,12 +272,13 @@ static int wled_update_status(struct backlight_device *bl) bl->props.state & BL_CORE_FBBLANK) brightness = 0; + mutex_lock(&wled->lock); if (brightness) { rc = wled->wled_set_brightness(wled, brightness); if (rc < 0) { dev_err(wled->dev, "wled failed to set brightness rc:%d\n", rc); - return rc; + goto unlock_mutex; } rc = wled->wled_sync_toggle(wled); @@ -267,15 +292,60 @@ static int wled_update_status(struct backlight_device *bl) rc = wled_module_enable(wled, !!brightness); if (rc < 0) { dev_err(wled->dev, "wled enable failed rc:%d\n", rc); - return rc; + goto unlock_mutex; } } wled->brightness = brightness; +unlock_mutex: + mutex_unlock(&wled->lock); + return rc; } +#define WLED_SHORT_DLY_MS 20 +#define WLED_SHORT_CNT_MAX 5 +#define WLED_SHORT_RESET_CNT_DLY_US HZ +static irqreturn_t wled_short_irq_handler(int irq, void *_wled) +{ + struct wled *wled = _wled; + int rc; + s64 elapsed_time; + + wled->short_count++; + mutex_lock(&wled->lock); + rc = wled_module_enable(wled, false); + if (rc < 0) { + dev_err(wled->dev, "wled disable failed rc:%d\n", rc); + goto unlock_mutex; + } + + elapsed_time = ktime_us_delta(ktime_get(), + wled->last_short_event); + if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US) + wled->short_count = 0; + + if (wled->short_count > WLED_SHORT_CNT_MAX) { + dev_err(wled->dev, "Short trigged %d times, disabling WLED forever!\n", + wled->short_count); + wled->force_mod_disable = true; + goto unlock_mutex; + } + + wled->last_short_event = ktime_get(); + + msleep(WLED_SHORT_DLY_MS); + rc = wled_module_enable(wled, true); + if (rc < 0) + dev_err(wled->dev, "wled enable failed rc:%d\n", rc); + +unlock_mutex: + mutex_unlock(&wled->lock); + + return IRQ_HANDLED; +} + static int wled3_setup(struct wled *wled) { u16 addr; @@ -435,6 +505,21 @@ static int wled4_setup(struct wled *wled) return rc; } + if (wled->cfg.external_pfet) { + /* Unlock the secure register access */ + rc = regmap_write(wled->regmap, wled->ctrl_addr + + WLED4_CTRL_REG_SEC_ACCESS, + WLED4_CTRL_REG_SEC_UNLOCK); + if (rc < 0) + return rc; + + rc = regmap_write(wled->regmap, + wled->ctrl_addr + WLED4_CTRL_REG_TEST1, + WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2); + if (rc < 0) + return rc; + } + return 0; } @@ -446,6 +531,7 @@ static int wled4_setup(struct wled *wled) .switch_freq = 11, .enabled_strings = 0xf, .cabc = false, + .external_pfet = true, }; static const u32 wled3_boost_i_limit_values[] = { @@ -628,6 +714,7 @@ static int wled_configure(struct wled *wled) { "qcom,cs-out", &cfg->cs_out_en, }, { "qcom,ext-gen", &cfg->ext_gen, }, { "qcom,cabc", &cfg->cabc, }, + { "qcom,external-pfet", &cfg->external_pfet, }, }; prop_addr = of_get_address(dev->of_node, 0, NULL, NULL); @@ -701,6 +788,39 @@ static int wled_configure(struct wled *wled) return 0; } +static int wled_configure_short_irq(struct wled *wled, + struct platform_device *pdev) +{ + int rc = 0; + + /* PM8941 doesn't have the short detection support */ + if (*wled->version == WLED_PM8941) + return 0; + + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + + WLED4_CTRL_REG_SHORT_PROTECT, + WLED4_CTRL_REG_SHORT_EN_MASK, + WLED4_CTRL_REG_SHORT_EN_MASK); + if (rc < 0) + return rc; + + wled->short_irq = platform_get_irq_byname(pdev, "short"); + if (wled->short_irq < 0) { + dev_dbg(&pdev->dev, "short irq is not used\n"); + return 0; + } + + rc = devm_request_threaded_irq(wled->dev, wled->short_irq, + NULL, wled_short_irq_handler, + IRQF_ONESHOT, + "wled_short_irq", wled); + if (rc < 0) + dev_err(wled->dev, "Unable to request short_irq (err:%d)\n", + rc); + + return rc; +} + static const struct backlight_ops wled_ops = { .update_status = wled_update_status, }; @@ -733,6 +853,8 @@ static int wled_probe(struct platform_device *pdev) return -ENODEV; } + mutex_init(&wled->lock); + rc = wled_configure(wled); if (rc) return rc; @@ -752,6 +874,10 @@ static int wled_probe(struct platform_device *pdev) } } + rc = wled_configure_short_irq(wled, pdev); + if (rc < 0) + return rc; + val = WLED_DEFAULT_BRIGHTNESS; of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
Handle the short circuit interrupt and check if the short circuit interrupt is valid. Re-enable the module to check if it goes away. Disable the module altogether if the short circuit event persists. Signed-off-by: Kiran Gunda <kgunda@codeaurora.org> --- drivers/video/backlight/qcom-wled.c | 134 ++++++++++++++++++++++++++++++++++-- 1 file changed, 130 insertions(+), 4 deletions(-)