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Mon, 13 Jun 2022 10:08:56 -0700 (PDT) Date: Mon, 13 Jun 2022 18:08:53 +0100 From: Daniel Thompson To: ChiaEn Wu Cc: jic23@kernel.org, lars@metafoo.de, matthias.bgg@gmail.com, lee.jones@linaro.org, jingoohan1@gmail.com, pavel@ucw.cz, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, linux-fbdev@vger.kernel.org, szunichen@gmail.com, ChiaEn Wu Subject: Re: [PATCH v2 15/15] video: backlight: mt6370: Add Mediatek MT6370 support Message-ID: <20220613170853.bffuwkcmflfgg4gt@ash.lan> References: <20220613111146.25221-1-peterwu.pub@gmail.com> <20220613111146.25221-16-peterwu.pub@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220613111146.25221-16-peterwu.pub@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220613_100902_291162_C0C354FD X-CRM114-Status: GOOD ( 19.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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). > + 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. > + 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. > + return -EINVAL; > + } Daniel. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel