linux-kernel - Re: [PATCH v2 2/2] leds: add Qualcomm PM8941 WLED driver

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Date:	Thu, 12 Feb 2015 20:26:13 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Grant Likely <grant.likely@...aro.org>
CC:	Courtney Cavin <courtney.cavin@...ymobile.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-leds@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 2/2] leds: add Qualcomm PM8941 WLED driver

On 01/23/15 16:54, Bjorn Andersson wrote:
> +
> +static int pm8941_wled_set(struct led_classdev *cdev,
> +			   enum led_brightness value)
> +{
> +	struct pm8941_wled *wled;
> +	u8 ctrl = 0;
> +	u16 val;
> +	int rc;
> +	int i;
> +
> +	wled = container_of(cdev, struct pm8941_wled, cdev);
> +
> +	if (value != 0)
> +		ctrl = PM8941_WLED_REG_MOD_EN_BIT;
> +
> +	val = value * PM8941_WLED_REG_VAL_MAX / LED_FULL;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +			wled->addr + PM8941_WLED_REG_MOD_EN,
> +			PM8941_WLED_REG_MOD_EN_MASK, ctrl);
> +	if (rc)
> +		return rc;
> +
> +	for (i = 0; i < wled->cfg.num_strings; ++i) {
> +		u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
> +
> +		rc = regmap_bulk_write(wled->regmap,
> +				wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i,
> +				v, 2);
> +		if (rc)
> +			return rc;
> +	}
> +
> +	rc = regmap_update_bits(wled->regmap,
> +			wled->addr + PM8941_WLED_REG_SYNC,
> +			PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL);
> +	if (rc)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +			wled->addr + PM8941_WLED_REG_SYNC,
> +			PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR);
> +	return rc;
> +}

This doesn't seem to do anything for the OVP spike mentioned in this
patch[1]. Do you see that problem on your device? I imagine the PMIC is
the same.

[1]
https://www.codeaurora.org/cgit/quic/la/kernel/msm/commit/?id=fef9e15072562f0f28dc7066dcdd69388df81ed3

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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