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[80.7.220.175]) by smtp.gmail.com with ESMTPSA id z12sm17048213wrv.31.2021.10.05.02.07.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Oct 2021 02:07:00 -0700 (PDT) Date: Tue, 5 Oct 2021 10:06:59 +0100 From: Daniel Thompson To: Marijn Suijten Cc: phone-devel@vger.kernel.org, Andy Gross , Bjorn Andersson , Lee Jones , Jingoo Han , ~postmarketos/upstreaming@lists.sr.ht, AngeloGioacchino Del Regno , Konrad Dybcio , Martin Botka , Jami Kettunen , Pavel Dubrova , Kiran Gunda , Courtney Cavin , Bryan Wu , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 02/10] backlight: qcom-wled: Use cpu_to_le16 macro to perform conversion Message-ID: <20211005090659.rt4bxlkvbabwsiru@maple.lan> References: <20211004192741.621870-1-marijn.suijten@somainline.org> <20211004192741.621870-3-marijn.suijten@somainline.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211004192741.621870-3-marijn.suijten@somainline.org> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Mon, Oct 04, 2021 at 09:27:33PM +0200, Marijn Suijten wrote: > The kernel already provides appropriate primitives to perform endianness > conversion which should be used in favour of manual bit-wrangling. > > Signed-off-by: Marijn Suijten > Reviewed-by: AngeloGioacchino Del Regno Reviewed-by: Daniel Thompson > --- > drivers/video/backlight/qcom-wled.c | 25 +++++++++++-------------- > 1 file changed, 11 insertions(+), 14 deletions(-) > > diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c > index 6af808af2328..9927ed98944a 100644 > --- a/drivers/video/backlight/qcom-wled.c > +++ b/drivers/video/backlight/qcom-wled.c > @@ -231,14 +231,14 @@ struct wled { > static int wled3_set_brightness(struct wled *wled, u16 brightness) > { > int rc, i; > - u8 v[2]; > + u16 v; > > - v[0] = brightness & 0xff; > - v[1] = (brightness >> 8) & 0xf; > + v = cpu_to_le16(brightness & WLED3_SINK_REG_BRIGHT_MAX); > > for (i = 0; i < wled->cfg.num_strings; ++i) { > rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr + > - WLED3_SINK_REG_BRIGHT(i), v, 2); > + WLED3_SINK_REG_BRIGHT(i), > + &v, sizeof(v)); > if (rc < 0) > return rc; > } > @@ -249,19 +249,18 @@ static int wled3_set_brightness(struct wled *wled, u16 brightness) > static int wled4_set_brightness(struct wled *wled, u16 brightness) > { > int rc, i; > - u16 low_limit = wled->max_brightness * 4 / 1000; > - u8 v[2]; > + u16 v, low_limit = wled->max_brightness * 4 / 1000; > > /* WLED4's lower limit of operation is 0.4% */ > if (brightness > 0 && brightness < low_limit) > brightness = low_limit; > > - v[0] = brightness & 0xff; > - v[1] = (brightness >> 8) & 0xf; > + v = cpu_to_le16(brightness & WLED3_SINK_REG_BRIGHT_MAX); > > for (i = 0; i < wled->cfg.num_strings; ++i) { > rc = regmap_bulk_write(wled->regmap, wled->sink_addr + > - WLED4_SINK_REG_BRIGHT(i), v, 2); > + WLED4_SINK_REG_BRIGHT(i), > + &v, sizeof(v)); > if (rc < 0) > return rc; > } > @@ -272,22 +271,20 @@ static int wled4_set_brightness(struct wled *wled, u16 brightness) > static int wled5_set_brightness(struct wled *wled, u16 brightness) > { > int rc, offset; > - u16 low_limit = wled->max_brightness * 1 / 1000; > - u8 v[2]; > + u16 v, low_limit = wled->max_brightness * 1 / 1000; > > /* WLED5's lower limit is 0.1% */ > if (brightness < low_limit) > brightness = low_limit; > > - v[0] = brightness & 0xff; > - v[1] = (brightness >> 8) & 0x7f; > + v = cpu_to_le16(brightness & WLED5_SINK_REG_BRIGHT_MAX_15B); > > offset = (wled->cfg.mod_sel == MOD_A) ? > WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB : > WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB; > > rc = regmap_bulk_write(wled->regmap, wled->sink_addr + offset, > - v, 2); > + &v, sizeof(v)); > return rc; > } > > -- > 2.33.0 >