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Wed, 08 Apr 2020 22:04:56 -0800 Received: from MTKMBS31N1.mediatek.inc (172.27.4.69) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 8 Apr 2020 23:04:58 -0700 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 9 Apr 2020 14:04:50 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 9 Apr 2020 14:04:50 +0800 Message-ID: <1586412280.8804.38.camel@mhfsdcap03> Subject: Re: [V6, 2/2] media: i2c: ov02a10: Add OV02A10 image sensor driver From: Dongchun Zhu To: Sakari Ailus Date: Thu, 9 Apr 2020 14:04:40 +0800 In-Reply-To: <20200408122037.GG5206@paasikivi.fi.intel.com> References: <20191211112849.16705-1-dongchun.zhu@mediatek.com> <20191211112849.16705-3-dongchun.zhu@mediatek.com> <20191211143640.GU32742@smile.fi.intel.com> <1586346824.8804.12.camel@mhfsdcap03> <20200408122037.GG5206@paasikivi.fi.intel.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 513442C1DEC60A504510EEBD8595EB1CADD9A36F2B881A70E081811C03A06B7C2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200408_230507_243969_6D83B152 X-CRM114-Status: GOOD ( 23.26 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, andriy.shevchenko@linux.intel.com, srv_heupstream@mediatek.com, shengnan.wang@mediatek.com, louis.kuo@mediatek.com, sj.huang@mediatek.com, robh+dt@kernel.org, linux-mediatek@lists.infradead.org, matthias.bgg@gmail.com, bingbu.cao@intel.com, mchehab@kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Sakari, On Wed, 2020-04-08 at 15:20 +0300, Sakari Ailus wrote: > Hi Dongchun, > > On Wed, Apr 08, 2020 at 07:53:44PM +0800, Dongchun Zhu wrote: > > Hello Andy, > > > > Thanks for the review. Sorry for the late reply. > > > > On Mon, 2019-12-11 at 16:36 +0200, Andy Shevchenko wrote: > > > On Wed, Dec 11, 2019 at 07:28:49PM +0800, Dongchun Zhu wrote: > > > > Add a V4L2 sub-device driver for OV02A10 image sensor. The OV02A10 is > > > > a 1/5" CMOS sensor from Omnivision, asupporting output format: 10-bit Raw. > > > > > > > > This chip has a single MIPI lane interface and use the I2C bus for > > > > control and the CSI-2 bus for data. > > > > > > ... > > > > > > > +#define OV02A10_MASK_8_BITS 0xff > > > > > > Besides GENMASK() why do you need a definition here? What's the point? > > > > > > > Fixed in next release. > > > > > ... > > > > > > > +static int ov02a10_entity_init_cfg(struct v4l2_subdev *sd, > > > > + struct v4l2_subdev_pad_config *cfg) { > > > > +struct v4l2_subdev_format fmt = { > > > > +.which = cfg ? V4L2_SUBDEV_FORMAT_TRY > > > > + : V4L2_SUBDEV_FORMAT_ACTIVE, > > > > +.format = { > > > > +.width = 1600, > > > > > > > +.height = 1200 > > > > > > Leave comma here. > > > > > > > Fixed in next release. > > > > > > +} > > > > +}; > > > > + > > > > +ov02a10_set_fmt(sd, cfg, &fmt); > > > > + > > > > +return 0; > > > > +} > > > > > > ... > > > > > > > +ret = i2c_smbus_write_byte_data(client, OV02A10_REG_GAIN, > > > > +(val & OV02A10_MASK_8_BITS)); > > > > > > Too many parentheses. > > > > > > > Fixed in next release. > > > > > > +if (ret < 0) > > > > +return ret; > > > > > > ... > > > > > > > +static int ov02a10_set_vblank(struct ov02a10 *ov02a10, int val) { > > > > +struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > > > > > > if you do > > > > > > int vts = val + ov02a10->cur_mode->height - OV02A10_BASIC_LINE; > > > > > > you may increase readability below... > > > > > > > Thanks for the suggestion. > > It seems better now. > > > > > > +int ret; > > > > + > > > > +ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE); > > > > +if (ret < 0) > > > > +return ret; > > > > + > > > > +ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H, > > > > +(((val + ov02a10->cur_mode->height - > > > > +OV02A10_BASIC_LINE) >> > > > > +OV02A10_VTS_SHIFT) & > > > > +OV02A10_MASK_8_BITS)); > > > > > > ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H, > > > (vts >> OV02A10_VTS_SHIFT) & > > > OV02A10_MASK_8_BITS)); > > > > > > And actually why do you need this mask here? Isn't enough to call > > > > > > ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H, > > > vts >> OV02A10_VTS_SHIFT); > > > > > > here... > > > > > > > > > > Yes. Now we code like this. > > > > > > +if (ret < 0) > > > > +return ret; > > > > + > > > > +ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_L, > > > > +((val + ov02a10->cur_mode->height - > > > > +OV02A10_BASIC_LINE) & > > > > +OV02A10_MASK_8_BITS)); > > > > > > ...and > > > > > > ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_L, vts); > > > > > > here? > > > > > > > Yes. Fixed in next release. > > > > > > +if (ret < 0) > > > > +return ret; > > > > + > > > > +return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE, > > > > + REG_ENABLE); > > > > +} > > > > > > ... > > > > > > > +static int ov02a10_check_hwcfg(struct device *dev, struct ov02a10 > > > > +*ov02a10) { > > > > +struct fwnode_handle *ep; > > > > +struct fwnode_handle *fwnode = dev_fwnode(dev); > > > > +struct v4l2_fwnode_endpoint bus_cfg = { > > > > > > > +.bus_type = V4L2_MBUS_CSI2_DPHY > > > > > > Leave comma here. > > > > > > > Fixed in next release. > > > > > > +}; > > > > +unsigned int i, j; > > > > +int ret; > > > > > > > +if (!fwnode) > > > > +return -ENXIO; > > > > > > A bit strange error code here. > > > > > > > This should be reported as -EINVAL. > > Fixed in next release. > > > > > > + > > > > +ep = fwnode_graph_get_next_endpoint(fwnode, NULL); > > > > +if (!ep) > > > > +return -ENXIO; > > > > + > > > > +ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg); > > > > +fwnode_handle_put(ep); > > > > +if (ret) > > > > +return ret; > > > > > > > +if (!bus_cfg.nr_of_link_frequencies) { > > > > +dev_err(dev, "no link frequencies defined"); > > > > +ret = -EINVAL; > > > > +goto check_hwcfg_error; > > > > +} > > > > > > I still think it's redundant check, though it's up to maintainers. > > > > > > > We still wanna keep this check. > > Keep same as ov2659 and ov8856. > > > > > > + > > > > +for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) { > > > > +for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) { > > > > +if (link_freq_menu_items[i] == > > > > +bus_cfg.link_frequencies[j]) > > > > +break; > > > > +} > > > > + > > > > +if (j == bus_cfg.nr_of_link_frequencies) { > > > > +dev_err(dev, "no link frequency %lld supported", > > > > +link_freq_menu_items[i]); > > > > +ret = -EINVAL; > > > > +goto check_hwcfg_error; > > > > +} > > > > +} > > > > + > > > > +check_hwcfg_error: > > > > +v4l2_fwnode_endpoint_free(&bus_cfg); > > > > + > > > > +return ret; > > > > +} > > > > > > ... > > > > > > > +static int ov02a10_probe(struct i2c_client *client) { > > > > > > > +/* Optional indication of physical rotation of sensor */ > > > > +ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation", > > > > +&rotation); > > > > > > > +if (!ret) { > > > > > > Why not positive conditional? > > > > > > > Okay. Fixed in next release. > > > > > > +ov02a10->upside_down = rotation == 180; > > > > +if (rotation == 180) { > > > > +ov02a10->upside_down = true; > > > > +ov02a10->fmt.code = MEDIA_BUS_FMT_SRGGB10_1X10; > > > > +} > > > > +} else { > > > > +dev_warn(dev, "failed to get rotation\n"); > > > > +} > > > > + > > > > +/* Optional indication of mipi TX speed */ > > > > +ret = fwnode_property_read_u32(dev_fwnode(dev), "ovti,mipi-tx-speed", > > > > + &clock_lane_tx_speed); > > > > + > > > > > > > +if (!ret) > > > > > > Ditto. > > > > > > > As Sakari mentioned earlier, the property "ovti,mipi-tx-speed" is > > optional that shouldn't warn it's missing when ret is 0. > > So we would keep the condition like that, just removing else case. > > I don't remember discussing this, but could be because it was quite some > time ago. > > It doesn't seem to be documented. What is it for? > Sorry for not addressing this point on v6. "ovti,mipi-tx-speed" is one private property in DT, which is abstracted to handle different register settings for different Chrome projects. More details please see the Google Issue: https://partnerissuetracker.corp.google.com/issues/143749215 And it would be documented in next release. > > > *********************MEDIATEK Confidential/Internal Use********************* > > Is this intentional? > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel