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Date:   Tue, 8 May 2018 11:35:47 +0100
From:   Daniel Thompson <daniel.thompson@linaro.org>
To:     Kiran Gunda <kgunda@codeaurora.org>
Cc:     bjorn.andersson@linaro.org, Lee Jones <lee.jones@linaro.org>,
        Jingoo Han <jingoohan1@gmail.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        linux-leds@vger.kernel.org
Subject: Re: [PATCH V2 3/5] backlight: qcom-wled: Add support for short
 circuit handling
Message-ID: <20180508103547.kv4bbrwxui6yihvs@holly.lan>
References: <1525342352-25072-1-git-send-email-kgunda@codeaurora.org>
 <1525342352-25072-4-git-send-email-kgunda@codeaurora.org>
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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
>