| Message ID | 1531131741-19971-8-git-send-email-kgunda@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 09/07/18 11:22, 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> > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> > --- > Changes from V3: > - Added Reviewed by tag. > - Addressed minor comments from Vinod > > drivers/video/backlight/qcom-wled.c | 132 ++++++++++++++++++++++++++++++++++-- > 1 file changed, 128 insertions(+), 4 deletions(-) > > diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c > index 362d254..a14f1a6 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> > @@ -64,6 +67,16 @@ > #define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10)) > #define WLED3_SINK_REG_STR_CABC_MASK BIT(7) > > +/* WLED4 specific 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 > + > /* WLED4 specific sink registers */ > #define WLED4_SINK_REG_CURR_SINK 0x46 > #define WLED4_SINK_REG_CURR_SINK_MASK GENMASK(7, 4) > @@ -113,17 +126,23 @@ 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 thread irq handler */ > + ktime_t last_short_event; > u16 ctrl_addr; > u16 sink_addr; > u16 max_string_count; > u32 brightness; > u32 max_brightness; > + u32 short_count; > + bool disabled_by_short; > + bool has_short_detect; > > struct wled_config cfg; > int (*wled_set_brightness)(struct wled *wled, u16 brightness); > @@ -174,6 +193,9 @@ static int wled_module_enable(struct wled *wled, int val) > { > int rc; > > + if (wled->disabled_by_short) > + return -EFAULT; EFAULT means bad address (memory fault). Perhaps EIO or maybe even something more exotic like ENXIO might be more appropriate? > + > rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + > WLED_CTRL_REG_MOD_EN, > WLED_CTRL_REG_MOD_EN_MASK, > @@ -210,18 +232,19 @@ 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_sync_toggle(wled); > if (rc < 0) { > dev_err(wled->dev, "wled sync failed rc:%d\n", rc); > - return rc; > + goto unlock_mutex; > } > } > > @@ -229,15 +252,61 @@ 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 USEC_PER_SEC > + > +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; Shouldn't this reset to 1 (e.g. we have just seen a short). Daniel.
On 2018-07-20 19:37, Daniel Thompson wrote: > On 09/07/18 11:22, 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> >> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> >> --- >> Changes from V3: >> - Added Reviewed by tag. >> - Addressed minor comments from Vinod >> >> drivers/video/backlight/qcom-wled.c | 132 >> ++++++++++++++++++++++++++++++++++-- >> 1 file changed, 128 insertions(+), 4 deletions(-) >> >> diff --git a/drivers/video/backlight/qcom-wled.c >> b/drivers/video/backlight/qcom-wled.c >> index 362d254..a14f1a6 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> >> @@ -64,6 +67,16 @@ >> #define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10)) >> #define WLED3_SINK_REG_STR_CABC_MASK BIT(7) >> +/* WLED4 specific 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 >> + >> /* WLED4 specific sink registers */ >> #define WLED4_SINK_REG_CURR_SINK 0x46 >> #define WLED4_SINK_REG_CURR_SINK_MASK GENMASK(7, 4) >> @@ -113,17 +126,23 @@ 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 thread irq handler */ >> + ktime_t last_short_event; >> u16 ctrl_addr; >> u16 sink_addr; >> u16 max_string_count; >> u32 brightness; >> u32 max_brightness; >> + u32 short_count; >> + bool disabled_by_short; >> + bool has_short_detect; >> struct wled_config cfg; >> int (*wled_set_brightness)(struct wled *wled, u16 brightness); >> @@ -174,6 +193,9 @@ static int wled_module_enable(struct wled *wled, >> int val) >> { >> int rc; >> + if (wled->disabled_by_short) >> + return -EFAULT; > > EFAULT means bad address (memory fault). Perhaps EIO or maybe even > something more exotic like ENXIO might be more appropriate? > > >> + >> rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + >> WLED_CTRL_REG_MOD_EN, >> WLED_CTRL_REG_MOD_EN_MASK, >> @@ -210,18 +232,19 @@ 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_sync_toggle(wled); >> if (rc < 0) { >> dev_err(wled->dev, "wled sync failed rc:%d\n", rc); >> - return rc; >> + goto unlock_mutex; >> } >> } >> @@ -229,15 +252,61 @@ 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 USEC_PER_SEC >> + >> +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; > > Shouldn't this reset to 1 (e.g. we have just seen a short). > > > Daniel. Ok. I will change it in the next series.
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index 362d254..a14f1a6 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> @@ -64,6 +67,16 @@ #define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10)) #define WLED3_SINK_REG_STR_CABC_MASK BIT(7) +/* WLED4 specific 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 + /* WLED4 specific sink registers */ #define WLED4_SINK_REG_CURR_SINK 0x46 #define WLED4_SINK_REG_CURR_SINK_MASK GENMASK(7, 4) @@ -113,17 +126,23 @@ 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 thread irq handler */ + ktime_t last_short_event; u16 ctrl_addr; u16 sink_addr; u16 max_string_count; u32 brightness; u32 max_brightness; + u32 short_count; + bool disabled_by_short; + bool has_short_detect; struct wled_config cfg; int (*wled_set_brightness)(struct wled *wled, u16 brightness); @@ -174,6 +193,9 @@ static int wled_module_enable(struct wled *wled, int val) { int rc; + if (wled->disabled_by_short) + return -EFAULT; + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + WLED_CTRL_REG_MOD_EN, WLED_CTRL_REG_MOD_EN_MASK, @@ -210,18 +232,19 @@ 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_sync_toggle(wled); if (rc < 0) { dev_err(wled->dev, "wled sync failed rc:%d\n", rc); - return rc; + goto unlock_mutex; } } @@ -229,15 +252,61 @@ 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 USEC_PER_SEC + +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->disabled_by_short = 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; @@ -325,7 +394,7 @@ static int wled4_setup(struct wled *wled) int rc, temp, i, j; u16 addr; u8 sink_en = 0; - u32 sink_cfg = 0; + u32 sink_cfg; rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + WLED_CTRL_REG_OVP, @@ -347,6 +416,21 @@ static int wled4_setup(struct wled *wled) if (rc < 0) 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; + } + rc = regmap_read(wled->regmap, wled->sink_addr + WLED4_SINK_REG_CURR_SINK, &sink_cfg); if (rc < 0) @@ -432,6 +516,7 @@ static int wled4_setup(struct wled *wled) .num_strings = 4, .switch_freq = 11, .cabc = false, + .external_pfet = false, }; static const u32 wled3_boost_i_limit_values[] = { @@ -600,6 +685,7 @@ static int wled_configure(struct wled *wled, int version) { "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); @@ -688,6 +774,38 @@ static int wled_configure(struct wled *wled, int version) return 0; } +static int wled_configure_short_irq(struct wled *wled, + struct platform_device *pdev) +{ + int rc, short_irq; + + if (!wled->has_short_detect) + 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; + + short_irq = platform_get_irq_byname(pdev, "short"); + if (short_irq < 0) { + dev_dbg(&pdev->dev, "short irq is not used\n"); + return 0; + } + + rc = devm_request_threaded_irq(wled->dev, 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, }; @@ -721,6 +839,7 @@ static int wled_probe(struct platform_device *pdev) return -ENODEV; } + mutex_init(&wled->lock); rc = wled_configure(wled, version); if (rc) return rc; @@ -735,6 +854,7 @@ static int wled_probe(struct platform_device *pdev) break; case WLED4: + wled->has_short_detect = true; rc = wled4_setup(wled); if (rc) { dev_err(&pdev->dev, "wled4_setup failed\n"); @@ -747,6 +867,10 @@ static int wled_probe(struct platform_device *pdev) break; } + 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);