linux-kernel - Re: [PATCH v6 12/13] leds: flash: mt6370: Add MediaTek MT6370 flashlight support

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Message-ID: <CAHp75Vf85_uzA9fRxTizbPJxODcXFpM4wuU6DxP2j9UA47B_2g@mail.gmail.com>
Date:   Mon, 25 Jul 2022 10:51:06 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     ChiaEn Wu <peterwu.pub@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>, Pavel Machek <pavel@....cz>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Helge Deller <deller@....de>,
        ChiaEn Wu <chiaen_wu@...htek.com>,
        Alice Chen <alice_chen@...htek.com>,
        cy_huang <cy_huang@...htek.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>,
        szuni chen <szunichen@...il.com>
Subject: Re: [PATCH v6 12/13] leds: flash: mt6370: Add MediaTek MT6370
 flashlight support

On Fri, Jul 22, 2022 at 12:25 PM ChiaEn Wu <peterwu.pub@...il.com> wrote:
>
> From: Alice Chen <alice_chen@...htek.com>
>
> The MediaTek MT6370 is a highly-integrated smart power management IC,
> which includes a single cell Li-Ion/Li-Polymer switching battery
> charger, a USB Type-C & Power Delivery (PD) controller, dual Flash
> LED current sources, a RGB LED driver, a backlight WLED driver,
> a display bias driver and a general LDO for portable devices.
>
> The Flash LED in MT6370 has 2 channels and support torch/strobe mode.
> Add the support of MT6370 FLASH LED.
>
> Signed-off-by: Alice Chen <alice_chen@...htek.com>

This SoB chain is wrong. Prioritize and read Submitting Patches!

...

> +static int mt6370_torch_brightness_set(struct led_classdev *lcdev,
> +                                      enum led_brightness level)
> +{
> +       struct mt6370_led *led = to_mt6370_led(lcdev, flash.led_cdev);
> +       struct mt6370_priv *priv = led->priv;
> +       u32 led_enable_mask = (led->led_no == MT6370_LED_JOINT) ?
> +                             MT6370_FLCSEN_MASK_ALL :
> +                             MT6370_FLCSEN_MASK(led->led_no);
> +       u32 enable_mask = MT6370_TORCHEN_MASK | led_enable_mask;
> +       u32 val = level ? led_enable_mask : 0;

> +       u32 prev = priv->fled_torch_used, curr;

Here and in the other functions with similar variables it seems you
never use prev after assigning curr.
Just define a single variable and use it accordingly.

> +       int ret, i;
> +
> +       mutex_lock(&priv->lock);
> +
> +       /*
> +        * Only one set of flash control logic,
> +        * use the flag to avoid strobe is currently used.
> +        */
> +       if (priv->fled_strobe_used) {
> +               dev_warn(lcdev->dev, "Please disable strobe first [%d]\n",
> +                        priv->fled_strobe_used);
> +               ret = -EBUSY;
> +               goto unlock;
> +       }
> +
> +       if (level)
> +               curr = prev | BIT(led->led_no);
> +       else
> +               curr = prev & ~BIT(led->led_no);
> +
> +       if (curr)
> +               val |= MT6370_TORCHEN_MASK;
> +
> +       if (level) {
> +               level -= 1;
> +               if (led->led_no == MT6370_LED_JOINT) {
> +                       int flevel[MT6370_MAX_LEDS];
> +
> +                       flevel[0] = level / 2;
> +                       flevel[1] = level - flevel[0];
> +                       for (i = 0; i < MT6370_MAX_LEDS; i++) {
> +                               ret = regmap_update_bits(priv->regmap,
> +                                               MT6370_REG_FLEDITOR(i),
> +                                               MT6370_ITORCH_MASK, flevel[i]);
> +                               if (ret)
> +                                       goto unlock;
> +                       }
> +               } else {
> +                       ret = regmap_update_bits(priv->regmap,
> +                                       MT6370_REG_FLEDITOR(led->led_no),
> +                                       MT6370_ITORCH_MASK, level);
> +                       if (ret)
> +                               goto unlock;
> +               }
> +       }
> +
> +       ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDEN,
> +                                enable_mask, val);
> +       if (ret)
> +               goto unlock;
> +
> +       priv->fled_torch_used = curr;
> +
> +unlock:
> +       mutex_unlock(&priv->lock);
> +       return ret;
> +}

...

> +       struct v4l2_flash_config v4l2_config = {0};

0 is not needed.

-- 
With Best Regards,
Andy Shevchenko