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bh=wftONSeKaH/t9zIDsYi/8TKzB3BgvM7TR3cIowzjwPE=; b=pc9+pbtPF6/aMrd4IFl5MqMGTUQ7SvY1q4JZ4KEsVoOUk2loyDBblHzm9K4TygurQ+ KSpYgzr+iwN8mYCz/LU16IxdapvSnQq+i7cA5/LumsoWK5d2TS6NPGI/I+0eEzOTf2rB vheJKHEuYa0FpuBlQTXnZ/YuLhuZTPm/LhHLxBsHZ2cktm2q/p6LrJbpM6ZPGzYyrLC+ eAmrf+ajuOMF+Q5KKV4cpkvETMpeK/xOW73WL2Ej0mFMeg85Y0tUb/6x2Om6utWdvXzC Y1Z5IKKpIPY8qcRPY06dA2yrSehyrdfimnv7cefrzAaZxzXiOZ6n2h9dQKWRfcGZUL9P 11DA== X-Gm-Message-State: AOAM531ss3kmIC5Bunbso4Y7I8EMJQ4GtcBBZFGBSQPxikeGj7Xyoh1r yB0UmVORZZHKDe1vnzURFUmqBGfcyxHrBSqh10E= X-Google-Smtp-Source: ABdhPJxdx2k6faJAeYpE0WCI1KCtlZ7wP2Lfj3vB44OJlEujfp72D+jeAyfOwjonxe2csWtPDrnSef04kteU5WbYih0= X-Received: by 2002:a25:5741:: with SMTP id l62mr25646407ybb.119.1620044675017; Mon, 03 May 2021 05:24:35 -0700 (PDT) MIME-Version: 1.0 References: <1618976938-20834-1-git-send-email-dillon.minfei@gmail.com> <1618976938-20834-5-git-send-email-dillon.minfei@gmail.com> In-Reply-To: <1618976938-20834-5-git-send-email-dillon.minfei@gmail.com> From: "Lad, Prabhakar" Date: Mon, 3 May 2021 13:24:08 +0100 Message-ID: Subject: Re: [PATCH v4 4/4] media: i2c: ov2659: Use clk_{prepare_enable, disable_unprepare}() to set xvclk on/off To: dillon.minfei@gmail.com Cc: Fabio Estevam , Shawn Guo , s.riedmueller@phytec.de, matthias.schiffer@ew.tq-group.com, leoyang.li@nxp.com, Arnd Bergmann , Olof Johansson , Sascha Hauer , Sascha Hauer , Mauro Carvalho Chehab , krzysztof.kozlowski@canonical.com, Krzysztof Kozlowski , Rob Herring , linux@rempel-privat.de, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , LKML , LAK , NXP Linux Team , linux-media X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210503_052437_872619_0C2C5BA9 X-CRM114-Status: GOOD ( 25.92 ) 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 Hi Dillon, Thank you for the patch. On Wed, Apr 21, 2021 at 4:49 AM wrote: > > From: dillon min > > On some platform(imx6q), xvclk might not switch on in advance, > also for power save purpose, xvclk should not be always on. > so, add clk_prepare_enable(), clk_disable_unprepare() in driver > side to set xvclk on/off at proper stage. > > Add following changes: > - add 'struct clk *clk;' in 'struct ov2659 {}' > - enable xvclk in ov2659_power_on() > - disable xvclk in ov2659_power_off() > > Signed-off-by: dillon min s / dillon min /Dillon Min (unless you prefer in lower case) ? > --- > v4: no changes > > drivers/media/i2c/ov2659.c | 24 ++++++++++++++++++------ > 1 file changed, 18 insertions(+), 6 deletions(-) > Acked-by: Lad Prabhakar Cheers, Prabhakar > diff --git a/drivers/media/i2c/ov2659.c b/drivers/media/i2c/ov2659.c > index 42f64175a6df..fb78a1cedc03 100644 > --- a/drivers/media/i2c/ov2659.c > +++ b/drivers/media/i2c/ov2659.c > @@ -204,6 +204,7 @@ struct ov2659 { > struct i2c_client *client; > struct v4l2_ctrl_handler ctrls; > struct v4l2_ctrl *link_frequency; > + struct clk *clk; > const struct ov2659_framesize *frame_size; > struct sensor_register *format_ctrl_regs; > struct ov2659_pll_ctrl pll; > @@ -1270,6 +1271,8 @@ static int ov2659_power_off(struct device *dev) > > gpiod_set_value(ov2659->pwdn_gpio, 1); > > + clk_disable_unprepare(ov2659->clk); > + > return 0; > } > > @@ -1278,9 +1281,17 @@ static int ov2659_power_on(struct device *dev) > struct i2c_client *client = to_i2c_client(dev); > struct v4l2_subdev *sd = i2c_get_clientdata(client); > struct ov2659 *ov2659 = to_ov2659(sd); > + int ret; > > dev_dbg(&client->dev, "%s:\n", __func__); > > + ret = clk_prepare_enable(ov2659->clk); > + if (ret) { > + dev_err(&client->dev, "%s: failed to enable clock\n", > + __func__); > + return ret; > + } > + > gpiod_set_value(ov2659->pwdn_gpio, 0); > > if (ov2659->resetb_gpio) { > @@ -1425,7 +1436,6 @@ static int ov2659_probe(struct i2c_client *client) > const struct ov2659_platform_data *pdata = ov2659_get_pdata(client); > struct v4l2_subdev *sd; > struct ov2659 *ov2659; > - struct clk *clk; > int ret; > > if (!pdata) { > @@ -1440,11 +1450,11 @@ static int ov2659_probe(struct i2c_client *client) > ov2659->pdata = pdata; > ov2659->client = client; > > - clk = devm_clk_get(&client->dev, "xvclk"); > - if (IS_ERR(clk)) > - return PTR_ERR(clk); > + ov2659->clk = devm_clk_get(&client->dev, "xvclk"); > + if (IS_ERR(ov2659->clk)) > + return PTR_ERR(ov2659->clk); > > - ov2659->xvclk_frequency = clk_get_rate(clk); > + ov2659->xvclk_frequency = clk_get_rate(ov2659->clk); > if (ov2659->xvclk_frequency < 6000000 || > ov2659->xvclk_frequency > 27000000) > return -EINVAL; > @@ -1506,7 +1516,9 @@ static int ov2659_probe(struct i2c_client *client) > ov2659->frame_size = &ov2659_framesizes[2]; > ov2659->format_ctrl_regs = ov2659_formats[0].format_ctrl_regs; > > - ov2659_power_on(&client->dev); > + ret = ov2659_power_on(&client->dev); > + if (ret < 0) > + goto error; > > ret = ov2659_detect(sd); > if (ret < 0) > -- > 2.7.4 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel