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Message-ID: <CABtFH5JKnxF5TqV=9EiAZEm4Un0npNo-GX8xLD4W5+S+pA+ysg@mail.gmail.com>
Date: Fri, 17 Jun 2022 17:34:35 +0800
From: ChiaEn Wu <peterwu.pub@...il.com>
To: Daniel Thompson <daniel.thompson@...aro.org>
Cc: jic23@...nel.org, lars@...afoo.de, matthias.bgg@...il.com,
lee.jones@...aro.org, jingoohan1@...il.com, pavel@....cz,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
linux-usb@...r.kernel.org, linux-fbdev@...r.kernel.org,
szunichen@...il.com, ChiaEn Wu <chiaen_wu@...htek.com>
Subject: Re: [PATCH v2 15/15] video: backlight: mt6370: Add Mediatek MT6370 support
Hi Daniel,
Thanks for your helpful feedback!
Daniel Thompson <daniel.thompson@...aro.org> 於 2022年6月14日 週二 凌晨1:08寫道：
>
> On Mon, Jun 13, 2022 at 07:11:46PM +0800, ChiaEn Wu wrote:
> > +static int mt6370_init_backlight_properties(struct mt6370_priv *priv,
> > + struct backlight_properties *props)
>
> Most of the changes in this version looks good... but it looks the new
> code in this function has a number of problems. See below...
>
>
> > +{
> > + struct device *dev = priv->dev;
> > + u8 prop_val;
> > + u32 brightness;
> > + unsigned int mask, val;
> > + int ret;
> > +
> > + /* Vendor optional properties
> > + * if property not exist, keep value in default.
> > + */
>
> That's not the right strategy for booleans. Not existing means false
> (e.g. flags should actively be unset).
>
I am so sorry for making these mistakes...
I will try to refine them in the right strategy in the next patch!
>
> > + if (device_property_read_bool(dev, "mediatek,bled-pwm-enable")) {
> > + ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_PWM,
> > + MT6370_BL_PWM_EN_MASK,
> > + MT6370_BL_PWM_EN_MASK);
> > + if (ret)
> > + return ret;
> > + }
>
> As above comment... all of the boolean properties are now being read
> incorrectly.
>
>
> > +
> > + if (device_property_read_bool(dev, "mediatek,bled-pwm-hys-enable")) {
> > + ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_PWM,
> > + MT6370_BL_PWM_HYS_EN_MASK,
> > + MT6370_BL_PWM_HYS_EN_MASK);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + ret = device_property_read_u8(dev, "mediatek,bled-pwm-hys-input-bit",
> > + &prop_val);
> > + if (!ret) {
> > + val = min_t(u8, prop_val, 3)
> > + << (ffs(MT6370_BL_PWM_HYS_SEL_MASK) - 1);
> > + ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_PWM,
> > + MT6370_BL_PWM_HYS_SEL_MASK, val);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + ret = device_property_read_u8(dev, "mediatek,bled-ovp-microvolt",
> > + &prop_val);
> > + if (!ret) {
> > + val = min_t(u8, prop_val, 3)
> > + << (ffs(MT6370_BL_OVP_SEL_MASK) - 1);
>
> This has been renamed but still seems to the using 0, 1, 2, 3 rather
> than an actual value in microvolts.
I’m so sorry for using the not actual value in microvolts and microamps.
I will refine these mistakes along with DT in the next patch. Thank you!
>
>
> > + ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_BSTCTRL,
> > + MT6370_BL_OVP_SEL_MASK, val);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + if (device_property_read_bool(dev, "mediatek,bled-ovp-shutdown")) {
> > + ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_BSTCTRL,
> > + MT6370_BL_OVP_EN_MASK,
> > + MT6370_BL_OVP_EN_MASK);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + ret = device_property_read_u8(dev, "mediatek,bled-ocp-microamp",
> > + &prop_val);
> > + if (!ret) {
> > + val = min_t(u8, prop_val, 3)
> > + << (ffs(MT6370_BL_OC_SEL_MASK) - 1);
>
> Likewise, should this be accepting a value in microamps?
>
>
> > + ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_BSTCTRL,
> > + MT6370_BL_OC_SEL_MASK, val);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + if (device_property_read_bool(dev, "mediatek,bled-ocp-shutdown")) {
> > + ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_BSTCTRL,
> > + MT6370_BL_OC_EN_MASK,
> > + MT6370_BL_OC_EN_MASK);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + /* Common properties */
> > + ret = device_property_read_u32(dev, "max-brightness", &brightness);
> > + if (ret)
> > + brightness = MT6370_BL_MAX_BRIGHTNESS;
> > +
> > + props->max_brightness = min_t(u32, brightness,
> > + MT6370_BL_MAX_BRIGHTNESS);
> > +
> > + ret = device_property_read_u32(dev, "default-brightness", &brightness);
> > + if (ret)
> > + brightness = props->max_brightness;
> > +
> > + props->brightness = min_t(u32, brightness, props->max_brightness);
> > +
> > +
> > + ret = device_property_read_u8(dev, "mediatek,bled-channel-use",
> > + &prop_val);
> > + if (ret) {
> > + dev_err(dev, "mediatek,bled-channel-use DT property missing\n");
> > + return ret;
> > + }
> > +
> > + if (!prop_val || prop_val > MT6370_BL_MAX_CH) {
> > + dev_err(dev, "No channel specified (ch_val:%d)\n", prop_val);
>
> Error string has not been updated to match condition that triggers it.
>
I will refine this wrong error string in the next patch, thanks!
>
> > + return -EINVAL;
> > + }
>
>
> Daniel.
Best regards,
ChiaEn Wu
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