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relay2-d.mail.gandi.net (Postfix) with ESMTPSA id 2D1FA40014; Thu, 19 Nov 2020 14:42:02 +0000 (UTC) Date: Thu, 19 Nov 2020 15:42:06 +0100 From: Jacopo Mondi To: Kieran Bingham Cc: Jacopo Mondi , laurent.pinchart+renesas@ideasonboard.com, niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org, linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Hyun Kwon , Manivannan Sadhasivam , sergei.shtylyov@gmail.com Subject: Re: [PATCH v5 1/8] media: i2c: Add driver for RDACM21 camera module Message-ID: <20201119144206.c2ek76uyci2g6j32@uno.localdomain> References: <20201116135305.81319-1-jacopo+renesas@jmondi.org> <20201116135305.81319-2-jacopo+renesas@jmondi.org> <20201117133634.s62i32hcwzikmhzb@uno.localdomain> <50b1f540-9289-b82b-e261-f549603556f7@ideasonboard.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <50b1f540-9289-b82b-e261-f549603556f7@ideasonboard.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Kieran, On Tue, Nov 17, 2020 at 03:31:37PM +0000, Kieran Bingham wrote: > On 17/11/2020 13:36, Jacopo Mondi wrote: > > Hi Kieran, > > > > On Mon, Nov 16, 2020 at 02:47:49PM +0000, Kieran Bingham wrote: > >> On 16/11/2020 13:52, Jacopo Mondi wrote: > >>> The RDACM21 is a GMSL camera supporting 1280x1080 resolution images > >>> developed by IMI based on an Omnivision OV10640 sensor, an Omnivision > >>> OV490 ISP and a Maxim MAX9271 GMSL serializer. > >>> > >>> The driver uses the max9271 library module, to maximize code reuse with > >>> other camera module drivers using the same serializer, such as rdacm20. > >>> > >>> Signed-off-by: Jacopo Mondi > >>> --- > >>> MAINTAINERS | 12 + > >>> drivers/media/i2c/Kconfig | 13 + > >>> drivers/media/i2c/Makefile | 2 + > >>> drivers/media/i2c/rdacm21.c | 595 ++++++++++++++++++++++++++++++++++++ > >>> 4 files changed, 622 insertions(+) > >>> create mode 100644 drivers/media/i2c/rdacm21.c > >>> > >>> diff --git a/MAINTAINERS b/MAINTAINERS > >>> index cef6b6090d76..9a5026fd6788 100644 > >>> --- a/MAINTAINERS > >>> +++ b/MAINTAINERS > >>> @@ -14750,6 +14750,18 @@ F: drivers/media/i2c/max9271.c > >>> F: drivers/media/i2c/max9271.h > >>> F: drivers/media/i2c/rdacm20.c > >>> > >>> +RDACM21 Camera Sensor > >>> +M: Jacopo Mondi > >>> +M: Kieran Bingham > >>> +M: Laurent Pinchart > >>> +M: Niklas Söderlund > >>> +L: linux-media@vger.kernel.org > >>> +S: Maintained > >>> +F: Documentation/devicetree/bindings/media/i2c/rdacm2x-gmsl.yaml > >>> +F: drivers/media/i2c/max9271.c > >>> +F: drivers/media/i2c/max9271.h > >>> +F: drivers/media/i2c/rdacm21.c > >>> + > >>> RDC R-321X SoC > >>> M: Florian Fainelli > >>> S: Maintained > >>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig > >>> index c64326ca331c..64f4316d11ad 100644 > >>> --- a/drivers/media/i2c/Kconfig > >>> +++ b/drivers/media/i2c/Kconfig > >>> @@ -1185,6 +1185,19 @@ config VIDEO_RDACM20 > >>> This camera should be used in conjunction with a GMSL > >>> deserialiser such as the MAX9286. > >>> > >>> +config VIDEO_RDACM21 > >>> + tristate "IMI RDACM21 camera support" > >>> + depends on I2C > >>> + select V4L2_FWNODE > >>> + select VIDEO_V4L2_SUBDEV_API > >>> + select MEDIA_CONTROLLER > >>> + help > >>> + This driver supports the IMI RDACM21 GMSL camera, used in > >>> + ADAS systems. > >>> + > >>> + This camera should be used in conjunction with a GMSL > >>> + deserialiser such as the MAX9286. > >>> + > >>> config VIDEO_RJ54N1 > >>> tristate "Sharp RJ54N1CB0C sensor support" > >>> depends on I2C && VIDEO_V4L2 > >>> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile > >>> index f0a77473979d..f3641b58929d 100644 > >>> --- a/drivers/media/i2c/Makefile > >>> +++ b/drivers/media/i2c/Makefile > >>> @@ -122,6 +122,8 @@ obj-$(CONFIG_VIDEO_IMX355) += imx355.o > >>> obj-$(CONFIG_VIDEO_MAX9286) += max9286.o > >>> rdacm20-camera_module-objs := rdacm20.o max9271.o > >>> obj-$(CONFIG_VIDEO_RDACM20) += rdacm20-camera_module.o > >>> +rdacm21-camera_module-objs := rdacm21.o max9271.o > >>> +obj-$(CONFIG_VIDEO_RDACM21) += rdacm21-camera_module.o > >>> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o > >>> > >>> obj-$(CONFIG_SDR_MAX2175) += max2175.o > >>> diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c > >>> new file mode 100644 > >>> index 000000000000..5f9267e26258 > >>> --- /dev/null > >>> +++ b/drivers/media/i2c/rdacm21.c > >>> @@ -0,0 +1,595 @@ > >>> +// SPDX-License-Identifier: GPL-2.0+ > >>> +/* > >>> + * IMI RDACM21 GMSL Camera Driver > >>> + * > >>> + * Copyright (C) 2017-2020 Jacopo Mondi > >>> + * Copyright (C) 2017-2019 Kieran Bingham > >>> + * Copyright (C) 2017-2019 Laurent Pinchart > >>> + * Copyright (C) 2017-2019 Niklas Söderlund > >>> + * Copyright (C) 2016 Renesas Electronics Corporation > >>> + * Copyright (C) 2015 Cogent Embedded, Inc. > >>> + */ > >>> + > >>> +#include > >>> +#include > >>> +#include > >>> +#include > >>> +#include > >>> +#include > >>> +#include > >>> + > >>> +#include > >>> +#include > >>> +#include > >>> +#include "max9271.h" > >>> + > >>> +#define OV10640_ID_LOW 0xa6 > > Should we keep the two OV10640 defines together? > > >>> + > >>> +#define OV490_I2C_ADDRESS 0x24 > >>> + > >>> +#define OV490_PAGE_HIGH_REG 0xfffd > >>> +#define OV490_PAGE_LOW_REG 0xfffe > >>> + > >>> +#define OV490_DVP_CTRL3 0x80286009 > >>> + > >>> +#define OV490_ODS_CTRL_FRAME_OUTPUT_EN 0x0c > >>> +#define OV490_ODS_CTRL 0x8029d000 > >>> + > >>> +#define OV490_ID_VAL 0x0490 > >>> +#define OV490_ID(_p, _v) ((((_p) & 0xff) << 8) | ((_v) & 0xff)) > >>> +#define OV490_PID 0x8080300a > >>> +#define OV490_VER 0x8080300b > >>> + > >>> +#define OV490_ISP_HSIZE_LOW 0x80820060 > >>> +#define OV490_ISP_HSIZE_HIGH 0x80820061 > >>> +#define OV490_ISP_VSIZE_LOW 0x80820062 > >>> +#define OV490_ISP_VSIZE_HIGH 0x80820063 > >>> + > >>> +#define OV10640_PIXEL_RATE (55000000) > >>> + > >>> +struct rdacm21_device { > >>> + struct device *dev; > >>> + struct max9271_device *serializer; > >>> + struct i2c_client *isp; > >>> + struct v4l2_subdev sd; > >>> + struct media_pad pad; > >>> + struct v4l2_mbus_framefmt fmt; > >>> + struct v4l2_ctrl_handler ctrls; > >>> + u32 addrs[32]; > >>> + u16 last_page; > >>> +}; > >>> + > >>> +static inline struct rdacm21_device *sd_to_rdacm21(struct v4l2_subdev *sd) > >>> +{ > >>> + return container_of(sd, struct rdacm21_device, sd); > >>> +} > >>> + > >>> +static inline struct rdacm21_device *i2c_to_rdacm21(struct i2c_client *client) > >>> +{ > >>> + return sd_to_rdacm21(i2c_get_clientdata(client)); > >>> +} > >>> + > >>> +static const struct ov490_reg { > >>> + u16 reg; > >>> + u8 val; > >>> +} ov490_regs_wizard[] = { > >>> + {0xfffd, 0x80}, > >>> + {0xfffe, 0x82}, > >>> + {0x0071, 0x11}, > >>> + {0x0075, 0x11}, > >>> + {0xfffe, 0x29}, > >>> + {0x6010, 0x01}, > >>> + /* > >>> + * OV490 EMB line disable in YUV and RAW data, > >>> + * NOTE: EMB line is still used in ISP and sensor > >>> + */ > >>> + {0xe000, 0x14}, > >>> + {0xfffe, 0x28}, > >>> + {0x6000, 0x04}, > >>> + {0x6004, 0x00}, > >>> + /* > >>> + * PCLK polarity - useless due to silicon bug. > >>> + * Use 0x808000bb register instead. > >>> + */ > >>> + {0x6008, 0x00}, > >>> + {0xfffe, 0x80}, > >>> + {0x0091, 0x00}, > >>> + /* bit[3]=0 - PCLK polarity workaround. */ > >>> + {0x00bb, 0x1d}, > >>> + /* Ov490 FSIN: app_fsin_from_fsync */ > >>> + {0xfffe, 0x85}, > >>> + {0x0008, 0x00}, > >>> + {0x0009, 0x01}, > >>> + /* FSIN0 source. */ > >>> + {0x000A, 0x05}, > >>> + {0x000B, 0x00}, > >>> + /* FSIN0 delay. */ > >>> + {0x0030, 0x02}, > >>> + {0x0031, 0x00}, > >>> + {0x0032, 0x00}, > >>> + {0x0033, 0x00}, > >>> + /* FSIN1 delay. */ > >>> + {0x0038, 0x02}, > >>> + {0x0039, 0x00}, > >>> + {0x003A, 0x00}, > >>> + {0x003B, 0x00}, > >>> + /* FSIN0 length. */ > >>> + {0x0070, 0x2C}, > >>> + {0x0071, 0x01}, > >>> + {0x0072, 0x00}, > >>> + {0x0073, 0x00}, > >>> + /* FSIN1 length. */ > >>> + {0x0074, 0x64}, > >>> + {0x0075, 0x00}, > >>> + {0x0076, 0x00}, > >>> + {0x0077, 0x00}, > >>> + {0x0000, 0x14}, > >>> + {0x0001, 0x00}, > >>> + {0x0002, 0x00}, > >>> + {0x0003, 0x00}, > >>> + /* > >>> + * Load fsin0,load fsin1,load other, > >>> + * It will be cleared automatically. > >>> + */ > >>> + {0x0004, 0x32}, > >>> + {0x0005, 0x00}, > >>> + {0x0006, 0x00}, > >>> + {0x0007, 0x00}, > >>> + {0xfffe, 0x80}, > >>> + /* Sensor FSIN. */ > >>> + {0x0081, 0x00}, > >>> + /* ov10640 FSIN enable */ > >>> + {0xfffe, 0x19}, > >>> + {0x5000, 0x00}, > >>> + {0x5001, 0x30}, > >>> + {0x5002, 0x8c}, > >>> + {0x5003, 0xb2}, > >>> + {0xfffe, 0x80}, > >>> + {0x00c0, 0xc1}, > >>> + /* ov10640 HFLIP=1 by default */ > >>> + {0xfffe, 0x19}, > >>> + {0x5000, 0x01}, > >>> + {0x5001, 0x00}, > >>> + {0xfffe, 0x80}, > >>> + {0x00c0, 0xdc}, > >>> +}; > >>> + > >>> +static int ov490_read(struct rdacm21_device *dev, u16 reg, u8 *val) > >>> +{ > >>> + u8 buf[2] = { reg >> 8, reg }; > >>> + int ret; > >>> + > >>> + ret = i2c_master_send(dev->isp, buf, 2); > >>> + if (ret == 2) > >>> + ret = i2c_master_recv(dev->isp, val, 1); > >>> + > >>> + if (ret < 0) { > >>> + dev_dbg(dev->dev, "%s: register 0x%04x read failed (%d)\n", > >>> + __func__, reg, ret); > >>> + return ret; > >>> + } > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int ov490_write(struct rdacm21_device *dev, u16 reg, u8 val) > >>> +{ > >>> + u8 buf[3] = { reg >> 8, reg, val }; > >>> + int ret; > >>> + > >>> + ret = i2c_master_send(dev->isp, buf, 3); > >>> + if (ret < 0) { > >>> + dev_err(dev->dev, "%s: register 0x%04x write failed (%d)\n", > >>> + __func__, reg, ret); > >>> + return ret; > >>> + } > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int ov490_set_page(struct rdacm21_device *dev, u16 reg) > >>> +{ > >>> + bool page_new = false; > >>> + u8 page_high = reg >> 8; > >>> + u8 page_low = reg; > >>> + int ret; > >>> + > >>> + if (page_high != (dev->last_page >> 8)) { > >>> + ret = ov490_write(dev, OV490_PAGE_HIGH_REG, page_high); > >>> + if (ret) > >>> + return ret; > >>> + page_new = true; > >>> + } > >>> + > >>> + if (page_low != (u8)dev->last_page) { > >>> + ret = ov490_write(dev, OV490_PAGE_LOW_REG, page_low); > >>> + if (ret) > >>> + return ret; > >>> + page_new = true; > >>> + } > >>> + > >>> + if (page_new) { > >>> + dev->last_page = reg; > >>> + usleep_range(100, 150); > >>> + } > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int ov490_read_reg(struct rdacm21_device *dev, u32 reg, u8 *val) > >>> +{ > >>> + int ret; > >>> + > >>> + ret = ov490_set_page(dev, reg >> 16); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + ret = ov490_read(dev, (u16)reg, val); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + dev_dbg(dev->dev, "%s: 0x%08x = 0x%02x\n", __func__, reg, *val); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int ov490_write_reg(struct rdacm21_device *dev, u32 reg, u8 val) > >>> +{ > >>> + int ret; > >>> + > >>> + ret = ov490_set_page(dev, reg >> 16); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + ret = ov490_write(dev, (u16)reg, val); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + dev_dbg(dev->dev, "%s: 0x%08x = 0x%02x\n", __func__, reg, val); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int rdacm21_s_stream(struct v4l2_subdev *sd, int enable) > >>> +{ > >>> + struct rdacm21_device *dev = sd_to_rdacm21(sd); > >>> + > >>> + /* > >>> + * Enable serial link now that the ISP provides a valid pixel clock > >>> + * to start serializing video data on the GMSL link. > >>> + */ > >>> + return max9271_set_serial_link(dev->serializer, enable); > >>> +} > >>> + > >>> +static int rdacm21_enum_mbus_code(struct v4l2_subdev *sd, > >>> + struct v4l2_subdev_pad_config *cfg, > >>> + struct v4l2_subdev_mbus_code_enum *code) > >>> +{ > >>> + if (code->pad || code->index > 0) > >>> + return -EINVAL; > >>> + > >>> + code->code = MEDIA_BUS_FMT_YUYV8_1X16; > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int rdacm21_get_fmt(struct v4l2_subdev *sd, > >>> + struct v4l2_subdev_pad_config *cfg, > >>> + struct v4l2_subdev_format *format) > >>> +{ > >>> + struct v4l2_mbus_framefmt *mf = &format->format; > >>> + struct rdacm21_device *dev = sd_to_rdacm21(sd); > >>> + > >>> + if (format->pad) > >>> + return -EINVAL; > >>> + > >>> + mf->width = dev->fmt.width; > >>> + mf->height = dev->fmt.height; > >>> + mf->code = MEDIA_BUS_FMT_YUYV8_1X16; > >>> + mf->colorspace = V4L2_COLORSPACE_SRGB; > >>> + mf->field = V4L2_FIELD_NONE; > >>> + mf->ycbcr_enc = V4L2_YCBCR_ENC_601; > >>> + mf->quantization = V4L2_QUANTIZATION_FULL_RANGE; > >>> + mf->xfer_func = V4L2_XFER_FUNC_NONE; > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static struct v4l2_subdev_video_ops rdacm21_video_ops = { > >>> + .s_stream = rdacm21_s_stream, > >>> +}; > >>> + > >>> +static const struct v4l2_subdev_pad_ops rdacm21_subdev_pad_ops = { > >>> + .enum_mbus_code = rdacm21_enum_mbus_code, > >>> + .get_fmt = rdacm21_get_fmt, > >>> + .set_fmt = rdacm21_get_fmt, > >>> +}; > >>> + > >>> +static struct v4l2_subdev_ops rdacm21_subdev_ops = { > >>> + .video = &rdacm21_video_ops, > >>> + .pad = &rdacm21_subdev_pad_ops, > >>> +}; > >>> + > >>> +static int ov490_initialize(struct rdacm21_device *dev) > >>> +{ > >>> + unsigned int ov490_pid_retry = 20; > >>> + unsigned int timeout; > >>> + u8 pid, ver, val; > >>> + unsigned int i; > >>> + int ret; > >>> + > >>> + /* Read OV490 Id to test communications. */ > >>> +pid_retry: > >>> + ret = ov490_read_reg(dev, OV490_PID, &pid); > >>> + if (ret < 0) { > >>> + /* Give OV490 a few more cycles to exit from reset. */ > >>> + if (ov490_pid_retry--) { > >>> + usleep_range(1000, 2000); > >>> + goto pid_retry; > >>> + } > >>> + > >>> + dev_err(dev->dev, "OV490 PID read failed (%d)\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + ret = ov490_read_reg(dev, OV490_VER, &ver); > >>> + if (ret < 0) { > >>> + dev_err(dev->dev, "OV490 VERSION read failed (%d)\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + if (OV490_ID(pid, ver) != OV490_ID_VAL) { > >>> + dev_err(dev->dev, "OV490 ID mismatch: (0x%04x)\n", > >>> + OV490_ID(pid, ver)); > >>> + return -ENODEV; > >>> + } > >>> + > >>> + /* Wait for firmware boot by reading streamon status. */ > >>> + for (timeout = 300; timeout > 0; timeout--) { > >>> + ov490_read_reg(dev, OV490_ODS_CTRL, &val); > >>> + if (val == OV490_ODS_CTRL_FRAME_OUTPUT_EN) > >>> + break; > >>> + mdelay(1); > >>> + } > >>> + if (!timeout) { > >>> + dev_err(dev->dev, "Timeout firmware boot wait\n"); > >>> + return -ENODEV; > >>> + } > >>> + dev_dbg(dev->dev, "Firmware booted in %u msec\n", 300 - timeout); > >>> + > >>> + /* Read OV10640 Id to test communications. */ > >>> + ov490_write(dev, 0xfffd, 0x80); > >>> + ov490_write(dev, 0xfffe, 0x19); > >>> + usleep_range(100, 150); > >> > >> Is that setting a page? Or doing something else? > >> > >>> + > >>> + ov490_write(dev, 0x5000, 0x01); > >>> + ov490_write(dev, 0x5001, 0x30); > >>> + ov490_write(dev, 0x5002, 0x0a); > >>> + > >>> + ov490_write(dev, 0xfffe, 0x80); > >>> + usleep_range(100, 150); > >>> + ov490_write(dev, 0xc0, 0xc1); > >>> + ov490_write(dev, 0xfffe, 0x19); > >> And here? > >> > >> Can this not go through the new helpers? > >> > >> If the 'read_reg', 'write_reg', helpers are not appropriate, at least > >> setting the pages could be done with set_page() ... but I'd be surprised > >> if those couldn't be handled with ov490_write_reg() ? > > > > As I've said in previous reply, I prefer the comunication with ov10640 > > to be kept explicit as long as we don't have more users and I don't > > better understand what register 0x5000 is for. > > > > Ok, I understand, but we 'know' it's the register page for communicating > with the Sensor though? > > Do we have any documentation on this at all? > > > > I can go through set_page() but the I have to pass 0x8019 which kind > > of defeat the purpose of defining registers by name > > > > I prefer to keep this as it is. > > > The issue I would have is you now have an invalid lastPage setting in > dev. So you're potentially letting yourself access registers on an > incorrect page, next time you use ov490_write_reg(). Correct, that's a very good point > > > You could quite easily define: > > /* > * The OV10640 is interacted with through > * registers in page 0x8019 using registers from 0x5000 to 0x5003, > * However the definition of these is currently unknown. > */ > #define SENSOR_REGISTER_0 0x80195000 > #define SENSOR_REGISTER_1 0x80195001 > #define SENSOR_REGISTER_2 0x80195002 > > To me that would be better than leaving some raw code inline > or maybe a short wrapper to make it even clearer that this talks to > /another component/: > > #define SENSOR_PAGE 0x8019 > > sensor_write(dev, reg, val) { > reg |= (SENSOR_PAGE << 16); > return ov490_write_reg(dev, reg, val); > } > > .. > sensor_write(dev, 0x5000, 0x01); As long as I don't have more users and I don't know what 0x5000 is for I don't want to make a function and hardcode this. > sensor_write(dev, 0x5001, 0x30); > sensor_write(dev, 0x5002, 0x0a); > ... > > > > >>> + usleep_range(1000, 1500); > >>> + ov490_read(dev, 0x5000, &val); > >>> + if (val != OV10640_ID_LOW) { > >>> + dev_err(dev->dev, "OV10640 ID mismatch: (0x%02x)\n", val); > >>> + return -ENODEV; > >>> + } > >>> + > >>> + dev_dbg(dev->dev, "OV10640 ID = 0x%2x\n", val); > >>> + > > Even if you want to keep the register writes raw, we know this code > block is handling the OV10640, so I'd be at least tempted to move it all > to a > > int ov10640_initialise(dev); > > but it's your code, and you seem quite against this, so I won't push > anymore. It's just it feels adding functions for 5 lines of code called once it's not that strictly necessary > > > > >>> + for (i = 0; i < ARRAY_SIZE(ov490_regs_wizard); ++i) { > >>> + ret = ov490_write(dev, ov490_regs_wizard[i].reg, > >>> + ov490_regs_wizard[i].val); > >>> + if (ret < 0) { > >>> + dev_err(dev->dev, > >>> + "%s: register %u (0x%04x) write failed (%d)\n", > >>> + __func__, i, ov490_regs_wizard[i].reg, ret); > >>> + > >>> + return -EIO; > >>> + } > >>> + > >>> + usleep_range(100, 150); > >>> + } > > You should almost certainly mark dev->lastPage as something invalid here > anyway (0xFFFF?). > > Otherwise the hardware page will be set to whatever was last used in the > ov490_regs_wizard table, and the ov490_read_reg() won't necessarily > update if it was on the same page last usage. > > > The incorrect lastPage is potentially a more critical issue though so > with that (if confirmed): Yes indeed, I'll make sure page changes go through the function in place to write 'regular' registers. > > Reviewed-by: Kieran Bingham > Thanks j > > > >>> + > >>> + /* > >>> + * The ISP is programmed with the content of a serial flash memory. > >>> + * Read the firmware configuration to reflect it through the V4L2 APIs. > >>> + */ > >>> + ov490_read_reg(dev, OV490_ISP_HSIZE_HIGH, &val); > >>> + dev->fmt.width = (val & 0xf) << 8; > >>> + ov490_read_reg(dev, OV490_ISP_HSIZE_LOW, &val); > >>> + dev->fmt.width |= (val & 0xff); > >>> + > >>> + ov490_read_reg(dev, OV490_ISP_VSIZE_HIGH, &val); > >>> + dev->fmt.height = (val & 0xf) << 8; > >>> + ov490_read_reg(dev, OV490_ISP_VSIZE_LOW, &val); > >>> + dev->fmt.height |= val & 0xff; > >>> + > >> > >> > >> Hrm, these look like "ov490_read_reg_long()", but given they're the only > >> occurrences of a "long read" I think we could leave it as is. > >> > >> > >>> + /* Set bus width to 12 bits with [0:11] ordering. */ > >>> + ov490_write_reg(dev, OV490_DVP_CTRL3, 0x10); > >>> + > >>> + dev_info(dev->dev, "Identified RDACM21 camera module\n"); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int rdacm21_initialize(struct rdacm21_device *dev) > >>> +{ > >>> + int ret; > >>> + > >>> + /* Verify communication with the MAX9271: ping to wakeup. */ > >>> + dev->serializer->client->addr = MAX9271_DEFAULT_ADDR; > >>> + i2c_smbus_read_byte(dev->serializer->client); > >>> + > >>> + /* Serial link disabled during config as it needs a valid pixel clock. */ > >>> + ret = max9271_set_serial_link(dev->serializer, false); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + /* Set GPO high to hold OV490 in reset during max9271 configuration. */ > >>> + ret = max9271_set_gpios(dev->serializer, MAX9271_GPO); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + /* Configure I2C bus at 105Kbps speed and configure GMSL link. */ > >>> + ret = max9271_configure_i2c(dev->serializer, > >>> + MAX9271_I2CSLVSH_469NS_234NS | > >>> + MAX9271_I2CSLVTO_1024US | > >>> + MAX9271_I2CMSTBT_105KBPS); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + ret = max9271_configure_gmsl_link(dev->serializer); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + ret = max9271_set_address(dev->serializer, dev->addrs[0]); > >>> + if (ret) > >>> + return ret; > >>> + dev->serializer->client->addr = dev->addrs[0]; > >>> + > >>> + /* > >>> + * Release OV490 from reset and program address translation > >>> + * before performing OV490 configuration. > >>> + */ > >>> + ret = max9271_clear_gpios(dev->serializer, MAX9271_GPO); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + ret = max9271_set_translation(dev->serializer, dev->addrs[1], > >>> + OV490_I2C_ADDRESS); > >>> + if (ret) > >>> + return ret; > >>> + dev->isp->addr = dev->addrs[1]; > >>> + > >>> + ret = ov490_initialize(dev); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + /* > >>> + * Set reverse channel high threshold to increase noise immunity. > >>> + * > >>> + * This should be compensated by increasing the reverse channel > >>> + * amplitude on the remote deserializer side. > >>> + */ > >>> + ret = max9271_set_high_threshold(dev->serializer, true); > >>> + if (ret) > >>> + return ret; > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int rdacm21_probe(struct i2c_client *client) > >>> +{ > >>> + struct rdacm21_device *dev; > >>> + struct fwnode_handle *ep; > >>> + int ret; > >>> + > >>> + dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL); > >>> + if (!dev) > >>> + return -ENOMEM; > >>> + dev->dev = &client->dev; > >>> + > >>> + dev->serializer = devm_kzalloc(&client->dev, sizeof(*dev->serializer), > >>> + GFP_KERNEL); > >>> + if (!dev->serializer) > >>> + return -ENOMEM; > >>> + > >>> + dev->serializer->client = client; > >>> + > >>> + ret = of_property_read_u32_array(client->dev.of_node, "reg", > >>> + dev->addrs, 2); > >>> + if (ret < 0) { > >>> + dev_err(dev->dev, "Invalid DT reg property: %d\n", ret); > >>> + return -EINVAL; > >>> + } > >>> + > >>> + /* Create the dummy I2C client for the sensor. */ > >>> + dev->isp = i2c_new_dummy_device(client->adapter, OV490_I2C_ADDRESS); > >>> + if (IS_ERR(dev->isp)) > >>> + return PTR_ERR(dev->isp); > >>> + > >>> + ret = rdacm21_initialize(dev); > >>> + if (ret < 0) > >>> + goto error; > >>> + > >>> + /* Initialize and register the subdevice. */ > >>> + v4l2_i2c_subdev_init(&dev->sd, client, &rdacm21_subdev_ops); > >>> + dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; > >>> + > >>> + v4l2_ctrl_handler_init(&dev->ctrls, 1); > >>> + v4l2_ctrl_new_std(&dev->ctrls, NULL, V4L2_CID_PIXEL_RATE, > >>> + OV10640_PIXEL_RATE, OV10640_PIXEL_RATE, 1, > >>> + OV10640_PIXEL_RATE); > >>> + dev->sd.ctrl_handler = &dev->ctrls; > >>> + > >>> + ret = dev->ctrls.error; > >>> + if (ret) > >>> + goto error_free_ctrls; > >>> + > >>> + dev->pad.flags = MEDIA_PAD_FL_SOURCE; > >>> + dev->sd.entity.flags |= MEDIA_ENT_F_CAM_SENSOR; > >>> + ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad); > >>> + if (ret < 0) > >>> + goto error_free_ctrls; > >>> + > >>> + ep = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev), NULL); > >>> + if (!ep) { > >>> + dev_err(&client->dev, > >>> + "Unable to get endpoint in node %pOF\n", > >>> + client->dev.of_node); > >>> + ret = -ENOENT; > >>> + goto error_free_ctrls; > >>> + } > >>> + dev->sd.fwnode = ep; > >>> + > >>> + ret = v4l2_async_register_subdev(&dev->sd); > >>> + if (ret) > >>> + goto error_put_node; > >>> + > >>> + return 0; > >>> + > >>> +error_put_node: > >>> + fwnode_handle_put(dev->sd.fwnode); > >>> +error_free_ctrls: > >>> + v4l2_ctrl_handler_free(&dev->ctrls); > >>> +error: > >>> + i2c_unregister_device(dev->isp); > >>> + > >>> + return ret; > >>> +} > >>> + > >>> +static int rdacm21_remove(struct i2c_client *client) > >>> +{ > >>> + struct rdacm21_device *dev = i2c_to_rdacm21(client); > >>> + > >>> + fwnode_handle_put(dev->sd.fwnode); > >>> + v4l2_async_unregister_subdev(&dev->sd); > >>> + v4l2_ctrl_handler_free(&dev->ctrls); > >>> + i2c_unregister_device(dev->isp); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static const struct of_device_id rdacm21_of_ids[] = { > >>> + { .compatible = "imi,rdacm21" }, > >>> + { } > >>> +}; > >>> +MODULE_DEVICE_TABLE(of, rdacm21_of_ids); > >>> + > >>> +static struct i2c_driver rdacm21_i2c_driver = { > >>> + .driver = { > >>> + .name = "rdacm21", > >>> + .of_match_table = rdacm21_of_ids, > >>> + }, > >>> + .probe_new = rdacm21_probe, > >>> + .remove = rdacm21_remove, > >>> +}; > >>> + > >>> +module_i2c_driver(rdacm21_i2c_driver); > >>> + > >>> +MODULE_DESCRIPTION("GMSL Camera driver for RDACM21"); > >>> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); > >>> +MODULE_LICENSE("GPL v2"); > >>> > >> >