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Message-ID: <20180118222648.kfam634qyy4eu2ed@valkosipuli.retiisi.org.uk>
Date: Fri, 19 Jan 2018 00:26:48 +0200
From: Sakari Ailus <sakari.ailus@....fi>
To: Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc: corbet@....net, mchehab@...nel.org, robh+dt@...nel.org,
mark.rutland@....com, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] v4l2: i2c: ov7670: Implement OF mbus configuration
Hi Jacopo,
On Fri, Jan 12, 2018 at 06:56:48PM +0100, Jacopo Mondi wrote:
> ov7670 driver supports two optional properties supplied through platform
> data, but currently does not support any standard video interface
> property.
>
> Add support through OF parsing for 2 generic properties (vsync and hsync
> polarities) and for one custom property already supported through
> platform data to suppress pixel clock output during horizontal
> blanking.
>
> While at there, check return value of register writes in set_fmt
> function and rationalize spacings.
>
> Signal polarities and pixel clock blanking verified through scope and
> image capture.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
> drivers/media/i2c/ov7670.c | 102 ++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 88 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
> index 950a0ac..ad5f9e9 100644
> --- a/drivers/media/i2c/ov7670.c
> +++ b/drivers/media/i2c/ov7670.c
> @@ -21,6 +21,7 @@
> #include <linux/gpio/consumer.h>
> #include <media/v4l2-device.h>
> #include <media/v4l2-ctrls.h>
> +#include <media/v4l2-fwnode.h>
> #include <media/v4l2-mediabus.h>
> #include <media/v4l2-image-sizes.h>
> #include <media/i2c/ov7670.h>
> @@ -237,6 +238,7 @@ struct ov7670_info {
> struct clk *clk;
> struct gpio_desc *resetb_gpio;
> struct gpio_desc *pwdn_gpio;
> + unsigned int mbus_config; /* Media bus configuration flags */
> int min_width; /* Filter out smaller sizes */
> int min_height; /* Filter out smaller sizes */
> int clock_speed; /* External clock speed (MHz) */
> @@ -995,7 +997,7 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
> #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> struct v4l2_mbus_framefmt *mbus_fmt;
> #endif
> - unsigned char com7;
> + unsigned char com7, com10 = 0;
> int ret;
>
> if (format->pad)
> @@ -1015,7 +1017,6 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
> }
>
> ret = ov7670_try_fmt_internal(sd, &format->format, &ovfmt, &wsize);
> -
> if (ret)
> return ret;
> /*
> @@ -1026,16 +1027,41 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
> */
> com7 = ovfmt->regs[0].value;
> com7 |= wsize->com7_bit;
> - ov7670_write(sd, REG_COM7, com7);
> + ret = ov7670_write(sd, REG_COM7, com7);
> + if (ret)
> + return ret;
> +
> + /*
> + * Configure the media bus through COM10 register
> + */
> + if (info->mbus_config & V4L2_MBUS_VSYNC_ACTIVE_LOW)
> + com10 |= COM10_VS_NEG;
> + if (info->mbus_config & V4L2_MBUS_HSYNC_ACTIVE_LOW)
> + com10 |= COM10_HREF_REV;
> + if (info->pclk_hb_disable)
> + com10 |= COM10_PCLK_HB;
> + ret = ov7670_write(sd, REG_COM10, com10);
> + if (ret)
> + return ret;
> +
> /*
> * Now write the rest of the array. Also store start/stops
> */
> - ov7670_write_array(sd, ovfmt->regs + 1);
> - ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
> - wsize->vstop);
> - ret = 0;
> - if (wsize->regs)
> + ret = ov7670_write_array(sd, ovfmt->regs + 1);
> + if (ret)
> + return ret;
> +
> + ret = ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
> + wsize->vstop);
> + if (ret)
> + return ret;
> +
> + if (wsize->regs) {
> ret = ov7670_write_array(sd, wsize->regs);
> + if (ret)
> + return ret;
> + }
> +
> info->fmt = ovfmt;
>
> /*
> @@ -1048,8 +1074,10 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
> * to write it unconditionally, and that will make the frame
> * rate persistent too.
> */
> - if (ret == 0)
> - ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
> + ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
> + if (ret)
> + return ret;
> +
> return 0;
> }
>
> @@ -1658,6 +1686,49 @@ static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info)
> return 0;
> }
>
> +/*
> + * ov7670_parse_dt() - Parse device tree to collect mbus configuration
> + * properties
> + */
> +static int ov7670_parse_dt(struct device *dev,
> + struct ov7670_info *info)
> +{
> + struct fwnode_handle *fwnode = dev_fwnode(dev);
> + struct v4l2_fwnode_endpoint bus_cfg;
> + struct fwnode_handle *ep;
> + int ret;
> +
> + if (!fwnode)
> + return -EINVAL;
> +
> + info->pclk_hb_disable = false;
> + if (fwnode_property_present(fwnode, "ov7670,pclk-hb-disable"))
> + info->pclk_hb_disable = true;
> +
> + ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
> + if (!ep) {
> + fwnode_handle_put(fwnode);
You haven't acquired a reference to fwnode, therefore you musn't put it.
Looks fine otherwise.
> + return -EINVAL;
> + }
> +
> + ret = v4l2_fwnode_endpoint_parse(ep, &bus_cfg);
> + if (ret)
> + goto error_put_fwnodes;
> +
> + if (bus_cfg.bus_type != V4L2_MBUS_PARALLEL) {
> + dev_err(dev, "Unsupported media bus type\n");
> + ret = -EINVAL;
> + goto error_put_fwnodes;
> + }
> + info->mbus_config = bus_cfg.bus.parallel.flags;
> +
> +error_put_fwnodes:
> + fwnode_handle_put(ep);
> + fwnode_handle_put(fwnode);
> +
> + return ret;
> +}
> +
> static int ov7670_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -1678,7 +1749,13 @@ static int ov7670_probe(struct i2c_client *client,
> #endif
>
> info->clock_speed = 30; /* default: a guess */
> - if (client->dev.platform_data) {
> +
> + if (dev_fwnode(&client->dev)) {
> + ret = ov7670_parse_dt(&client->dev, info);
> + if (ret)
> + return ret;
> +
> + } else if (client->dev.platform_data) {
> struct ov7670_config *config = client->dev.platform_data;
>
> /*
> @@ -1745,9 +1822,6 @@ static int ov7670_probe(struct i2c_client *client,
> tpf.denominator = 30;
> info->devtype->set_framerate(sd, &tpf);
>
> - if (info->pclk_hb_disable)
> - ov7670_write(sd, REG_COM10, COM10_PCLK_HB);
> -
> v4l2_ctrl_handler_init(&info->hdl, 10);
> v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
> V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
> --
> 2.7.4
>
--
Sakari Ailus
e-mail: sakari.ailus@....fi
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