Message-ID: <82b45a09-c29b-d0ce-d38f-50d30a344b5d@xs4all.nl>
Date:   Tue, 6 Feb 2018 14:19:42 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Shunqian Zheng <zhengsq@...k-chips.com>,
        linux-rockchip@...ts.infradead.org, linux-media@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mchehab@...nel.org, sakari.ailus@...ux.intel.com,
        hans.verkuil@...co.com, tfiga@...omium.org,
        laurent.pinchart@...asonboard.com, zyc@...k-chips.com,
        eddie.cai.linux@...il.com, jeffy.chen@...k-chips.com,
        allon.huang@...k-chips.com, devicetree@...r.kernel.org,
        heiko@...ech.de, robh+dt@...nel.org, Joao.Pinto@...opsys.com,
        Luis.Oliveira@...opsys.com, Jose.Abreu@...opsys.com,
        jacob2.chen@...k-chips.com
Subject: Re: [PATCH v5 04/16] media: rkisp1: add Rockchip MIPI Synopsys DPHY
 driver

On 12/29/17 08:52, Shunqian Zheng wrote:
> From: Jacob Chen <jacob2.chen@...k-chips.com>
> 
> This commit adds a subdev driver for Rockchip MIPI Synopsys DPHY driver
> 
> Signed-off-by: Jacob Chen <jacob2.chen@...k-chips.com>
> Signed-off-by: Shunqian Zheng <zhengsq@...k-chips.com>
> Signed-off-by: Tomasz Figa <tfiga@...omium.org>
> ---
>  .../media/platform/rockchip/isp1/mipi_dphy_sy.c    | 787 +++++++++++++++++++++
>  1 file changed, 787 insertions(+)
>  create mode 100644 drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
> 
> diff --git a/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
> new file mode 100644
> index 0000000..9421183
> --- /dev/null
> +++ b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
> @@ -0,0 +1,787 @@
> +/*
> + * Rockchip MIPI Synopsys DPHY driver
> + *
> + * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
> + *
> + * This software is available to you under a choice of one of two
> + * licenses.  You may choose to be licensed under the terms of the GNU
> + * General Public License (GPL) Version 2, available from the file
> + * COPYING in the main directory of this source tree, or the
> + * OpenIB.org BSD license below:
> + *
> + *     Redistribution and use in source and binary forms, with or
> + *     without modification, are permitted provided that the following
> + *     conditions are met:
> + *
> + *      - Redistributions of source code must retain the above
> + *        copyright notice, this list of conditions and the following
> + *        disclaimer.
> + *
> + *      - Redistributions in binary form must reproduce the above
> + *        copyright notice, this list of conditions and the following
> + *        disclaimer in the documentation and/or other materials
> + *        provided with the distribution.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
> + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
> + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> + * SOFTWARE.

If possible, please use the new SPDX license tags. Hmm, you used it elsewhere,
so why not here?

> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +#define RK3288_GRF_SOC_CON6	0x025c
> +#define RK3288_GRF_SOC_CON8	0x0264
> +#define RK3288_GRF_SOC_CON9	0x0268
> +#define RK3288_GRF_SOC_CON10	0x026c
> +#define RK3288_GRF_SOC_CON14	0x027c
> +#define RK3288_GRF_SOC_STATUS21	0x02d4
> +#define RK3288_GRF_IO_VSEL	0x0380
> +#define RK3288_GRF_SOC_CON15	0x03a4
> +
> +#define RK3399_GRF_SOC_CON9	0x6224
> +#define RK3399_GRF_SOC_CON21	0x6254
> +#define RK3399_GRF_SOC_CON22	0x6258
> +#define RK3399_GRF_SOC_CON23	0x625c
> +#define RK3399_GRF_SOC_CON24	0x6260
> +#define RK3399_GRF_SOC_CON25	0x6264
> +#define RK3399_GRF_SOC_STATUS1	0xe2a4
> +
> +#define CLOCK_LANE_HS_RX_CONTROL		0x34
> +#define LANE0_HS_RX_CONTROL			0x44
> +#define LANE1_HS_RX_CONTROL			0x54
> +#define LANE2_HS_RX_CONTROL			0x84
> +#define LANE3_HS_RX_CONTROL			0x94
> +#define HS_RX_DATA_LANES_THS_SETTLE__CONTROL	0x75
> +
> +#define HIWORD_UPDATE(val, mask, shift) \
> +	((val) << (shift) | (mask) << ((shift) + 16))
> +
> +enum mipi_dphy_sy_pads {
> +	MIPI_DPHY_SY_PAD_SINK = 0,
> +	MIPI_DPHY_SY_PAD_SOURCE,
> +	MIPI_DPHY_SY_PADS_NUM,
> +};
> +
> +enum dphy_reg_id {
> +	GRF_DPHY_RX0_TURNDISABLE = 0,
> +	GRF_DPHY_RX0_FORCERXMODE,
> +	GRF_DPHY_RX0_FORCETXSTOPMODE,
> +	GRF_DPHY_RX0_ENABLE,
> +	GRF_DPHY_RX0_TESTCLR,
> +	GRF_DPHY_RX0_TESTCLK,
> +	GRF_DPHY_RX0_TESTEN,
> +	GRF_DPHY_RX0_TESTDIN,
> +	GRF_DPHY_RX0_TURNREQUEST,
> +	GRF_DPHY_RX0_TESTDOUT,
> +	GRF_DPHY_TX0_TURNDISABLE,
> +	GRF_DPHY_TX0_FORCERXMODE,
> +	GRF_DPHY_TX0_FORCETXSTOPMODE,
> +	GRF_DPHY_TX0_TURNREQUEST,
> +	GRF_DPHY_TX1RX1_TURNDISABLE,
> +	GRF_DPHY_TX1RX1_FORCERXMODE,
> +	GRF_DPHY_TX1RX1_FORCETXSTOPMODE,
> +	GRF_DPHY_TX1RX1_ENABLE,
> +	GRF_DPHY_TX1RX1_MASTERSLAVEZ,
> +	GRF_DPHY_TX1RX1_BASEDIR,
> +	GRF_DPHY_TX1RX1_ENABLECLK,
> +	GRF_DPHY_TX1RX1_TURNREQUEST,
> +	GRF_DPHY_RX1_SRC_SEL,
> +	/* rk3288 only */
> +	GRF_CON_DISABLE_ISP,
> +	GRF_CON_ISP_DPHY_SEL,
> +	GRF_DSI_CSI_TESTBUS_SEL,
> +	GRF_DVP_V18SEL,
> +	/* below is for rk3399 only */
> +	GRF_DPHY_RX0_CLK_INV_SEL,
> +	GRF_DPHY_RX1_CLK_INV_SEL,
> +};
> +
> +struct dphy_reg {
> +	u32 offset;
> +	u32 mask;
> +	u32 shift;
> +};
> +
> +#define PHY_REG(_offset, _width, _shift) \
> +	{ .offset = _offset, .mask = BIT(_width) - 1, .shift = _shift, }
> +
> +static const struct dphy_reg rk3399_grf_dphy_regs[] = {
> +	[GRF_DPHY_RX0_TURNREQUEST] = PHY_REG(RK3399_GRF_SOC_CON9, 4, 0),
> +	[GRF_DPHY_RX0_CLK_INV_SEL] = PHY_REG(RK3399_GRF_SOC_CON9, 1, 10),
> +	[GRF_DPHY_RX1_CLK_INV_SEL] = PHY_REG(RK3399_GRF_SOC_CON9, 1, 11),
> +	[GRF_DPHY_RX0_ENABLE] = PHY_REG(RK3399_GRF_SOC_CON21, 4, 0),
> +	[GRF_DPHY_RX0_FORCERXMODE] = PHY_REG(RK3399_GRF_SOC_CON21, 4, 4),
> +	[GRF_DPHY_RX0_FORCETXSTOPMODE] = PHY_REG(RK3399_GRF_SOC_CON21, 4, 8),
> +	[GRF_DPHY_RX0_TURNDISABLE] = PHY_REG(RK3399_GRF_SOC_CON21, 4, 12),
> +	[GRF_DPHY_TX0_FORCERXMODE] = PHY_REG(RK3399_GRF_SOC_CON22, 4, 0),
> +	[GRF_DPHY_TX0_FORCETXSTOPMODE] = PHY_REG(RK3399_GRF_SOC_CON22, 4, 4),
> +	[GRF_DPHY_TX0_TURNDISABLE] = PHY_REG(RK3399_GRF_SOC_CON22, 4, 8),
> +	[GRF_DPHY_TX0_TURNREQUEST] = PHY_REG(RK3399_GRF_SOC_CON22, 4, 12),
> +	[GRF_DPHY_TX1RX1_ENABLE] = PHY_REG(RK3399_GRF_SOC_CON23, 4, 0),
> +	[GRF_DPHY_TX1RX1_FORCERXMODE] = PHY_REG(RK3399_GRF_SOC_CON23, 4, 4),
> +	[GRF_DPHY_TX1RX1_FORCETXSTOPMODE] = PHY_REG(RK3399_GRF_SOC_CON23, 4, 8),
> +	[GRF_DPHY_TX1RX1_TURNDISABLE] = PHY_REG(RK3399_GRF_SOC_CON23, 4, 12),
> +	[GRF_DPHY_TX1RX1_TURNREQUEST] = PHY_REG(RK3399_GRF_SOC_CON24, 4, 0),
> +	[GRF_DPHY_RX1_SRC_SEL] = PHY_REG(RK3399_GRF_SOC_CON24, 1, 4),
> +	[GRF_DPHY_TX1RX1_BASEDIR] = PHY_REG(RK3399_GRF_SOC_CON24, 1, 5),
> +	[GRF_DPHY_TX1RX1_ENABLECLK] = PHY_REG(RK3399_GRF_SOC_CON24, 1, 6),
> +	[GRF_DPHY_TX1RX1_MASTERSLAVEZ] = PHY_REG(RK3399_GRF_SOC_CON24, 1, 7),
> +	[GRF_DPHY_RX0_TESTDIN] = PHY_REG(RK3399_GRF_SOC_CON25, 8, 0),
> +	[GRF_DPHY_RX0_TESTEN] = PHY_REG(RK3399_GRF_SOC_CON25, 1, 8),
> +	[GRF_DPHY_RX0_TESTCLK] = PHY_REG(RK3399_GRF_SOC_CON25, 1, 9),
> +	[GRF_DPHY_RX0_TESTCLR] = PHY_REG(RK3399_GRF_SOC_CON25, 1, 10),
> +	[GRF_DPHY_RX0_TESTDOUT] = PHY_REG(RK3399_GRF_SOC_STATUS1, 8, 0),
> +};
> +
> +static const struct dphy_reg rk3288_grf_dphy_regs[] = {
> +	[GRF_CON_DISABLE_ISP] = PHY_REG(RK3288_GRF_SOC_CON6, 1, 0),
> +	[GRF_CON_ISP_DPHY_SEL] = PHY_REG(RK3288_GRF_SOC_CON6, 1, 1),
> +	[GRF_DSI_CSI_TESTBUS_SEL] = PHY_REG(RK3288_GRF_SOC_CON6, 1, 14),
> +	[GRF_DPHY_TX0_TURNDISABLE] = PHY_REG(RK3288_GRF_SOC_CON8, 4, 0),
> +	[GRF_DPHY_TX0_FORCERXMODE] = PHY_REG(RK3288_GRF_SOC_CON8, 4, 4),
> +	[GRF_DPHY_TX0_FORCETXSTOPMODE] = PHY_REG(RK3288_GRF_SOC_CON8, 4, 8),
> +	[GRF_DPHY_TX1RX1_TURNDISABLE] = PHY_REG(RK3288_GRF_SOC_CON9, 4, 0),
> +	[GRF_DPHY_TX1RX1_FORCERXMODE] = PHY_REG(RK3288_GRF_SOC_CON9, 4, 4),
> +	[GRF_DPHY_TX1RX1_FORCETXSTOPMODE] = PHY_REG(RK3288_GRF_SOC_CON9, 4, 8),
> +	[GRF_DPHY_TX1RX1_ENABLE] = PHY_REG(RK3288_GRF_SOC_CON9, 4, 12),
> +	[GRF_DPHY_RX0_TURNDISABLE] = PHY_REG(RK3288_GRF_SOC_CON10, 4, 0),
> +	[GRF_DPHY_RX0_FORCERXMODE] = PHY_REG(RK3288_GRF_SOC_CON10, 4, 4),
> +	[GRF_DPHY_RX0_FORCETXSTOPMODE] = PHY_REG(RK3288_GRF_SOC_CON10, 4, 8),
> +	[GRF_DPHY_RX0_ENABLE] = PHY_REG(RK3288_GRF_SOC_CON10, 4, 12),
> +	[GRF_DPHY_RX0_TESTCLR] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 0),
> +	[GRF_DPHY_RX0_TESTCLK] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 1),
> +	[GRF_DPHY_RX0_TESTEN] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 2),
> +	[GRF_DPHY_RX0_TESTDIN] = PHY_REG(RK3288_GRF_SOC_CON14, 8, 3),
> +	[GRF_DPHY_TX1RX1_ENABLECLK] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 12),
> +	[GRF_DPHY_RX1_SRC_SEL] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 13),
> +	[GRF_DPHY_TX1RX1_MASTERSLAVEZ] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 14),
> +	[GRF_DPHY_TX1RX1_BASEDIR] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 15),
> +	[GRF_DPHY_RX0_TURNREQUEST] = PHY_REG(RK3288_GRF_SOC_CON15, 4, 0),
> +	[GRF_DPHY_TX1RX1_TURNREQUEST] = PHY_REG(RK3288_GRF_SOC_CON15, 4, 4),
> +	[GRF_DPHY_TX0_TURNREQUEST] = PHY_REG(RK3288_GRF_SOC_CON15, 3, 8),
> +	[GRF_DVP_V18SEL] = PHY_REG(RK3288_GRF_IO_VSEL, 1, 1),
> +	[GRF_DPHY_RX0_TESTDOUT] = PHY_REG(RK3288_GRF_SOC_STATUS21, 8, 0),
> +};
> +
> +struct hsfreq_range {
> +	u32 range_h;
> +	u8 cfg_bit;
> +};
> +
> +struct dphy_drv_data {
> +	const char * const *clks;
> +	int num_clks;
> +	const struct hsfreq_range *hsfreq_ranges;
> +	int num_hsfreq_ranges;
> +	const struct dphy_reg *regs;
> +};
> +
> +struct sensor_async_subdev {
> +	struct v4l2_async_subdev asd;
> +	struct v4l2_mbus_config mbus;
> +	int lanes;
> +};
> +
> +#define MAX_DPHY_CLK		8
> +#define MAX_DPHY_SENSORS	2
> +
> +struct mipidphy_sensor {
> +	struct v4l2_subdev *sd;
> +	struct v4l2_mbus_config mbus;
> +	int lanes;
> +};
> +
> +struct mipidphy_priv {
> +	struct device *dev;
> +	struct regmap *regmap_grf;
> +	const struct dphy_reg *grf_regs;
> +	struct clk *clks[MAX_DPHY_CLK];
> +	const struct dphy_drv_data *drv_data;
> +	u64 data_rate_mbps;
> +	struct v4l2_async_notifier notifier;
> +	struct v4l2_subdev sd;
> +	struct media_pad pads[MIPI_DPHY_SY_PADS_NUM];
> +	struct mipidphy_sensor sensors[MAX_DPHY_SENSORS];
> +	int num_sensors;
> +	bool is_streaming;
> +};
> +
> +static inline struct mipidphy_priv *to_dphy_priv(struct v4l2_subdev *subdev)
> +{
> +	return container_of(subdev, struct mipidphy_priv, sd);
> +}
> +
> +static inline void write_reg(struct mipidphy_priv *priv, int index, u8 value)
> +{
> +	const struct dphy_reg *reg = &priv->grf_regs[index];
> +	unsigned int val = HIWORD_UPDATE(value, reg->mask, reg->shift);
> +
> +	WARN_ON(!reg->offset);
> +	regmap_write(priv->regmap_grf, reg->offset, val);
> +}
> +
> +static void mipidphy_wr_reg(struct mipidphy_priv *priv,
> +			    u8 test_code, u8 test_data)
> +{
> +	/*
> +	 * With the falling edge on TESTCLK, the TESTDIN[7:0] signal content
> +	 * is latched internally as the current test code. Test data is
> +	 * programmed internally by rising edge on TESTCLK.
> +	 */
> +	write_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
> +	write_reg(priv, GRF_DPHY_RX0_TESTDIN, test_code);
> +	write_reg(priv, GRF_DPHY_RX0_TESTEN, 1);
> +	write_reg(priv, GRF_DPHY_RX0_TESTCLK, 0);
> +	write_reg(priv, GRF_DPHY_RX0_TESTEN, 0);
> +	write_reg(priv, GRF_DPHY_RX0_TESTDIN, test_data);
> +	write_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
> +}
> +
> +static struct v4l2_subdev *get_remote_sensor(struct v4l2_subdev *sd)
> +{
> +	struct media_pad *local, *remote;
> +	struct media_entity *sensor_me;
> +
> +	local = &sd->entity.pads[MIPI_DPHY_SY_PAD_SINK];
> +	remote = media_entity_remote_pad(local);
> +	if (!remote) {
> +		v4l2_warn(sd, "No link between dphy and sensor\n");
> +		return NULL;
> +	}
> +
> +	sensor_me = media_entity_remote_pad(local)->entity;
> +	return media_entity_to_v4l2_subdev(sensor_me);
> +}
> +
> +static struct mipidphy_sensor *sd_to_sensor(struct mipidphy_priv *priv,
> +					    struct v4l2_subdev *sd)
> +{
> +	int i;
> +
> +	for (i = 0; i < priv->num_sensors; ++i)
> +		if (priv->sensors[i].sd == sd)
> +			return &priv->sensors[i];
> +
> +	return NULL;
> +}
> +
> +static int mipidphy_get_sensor_data_rate(struct v4l2_subdev *sd)
> +{
> +	struct mipidphy_priv *priv = to_dphy_priv(sd);
> +	struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
> +	struct v4l2_ctrl *link_freq;
> +	struct v4l2_querymenu qm = { .id = V4L2_CID_LINK_FREQ, };
> +	int ret;
> +
> +	link_freq = v4l2_ctrl_find(sensor_sd->ctrl_handler, V4L2_CID_LINK_FREQ);
> +	if (!link_freq) {
> +		v4l2_warn(sd, "No pixel rate control in subdev\n");
> +		return -EPIPE;
> +	}
> +
> +	qm.index = v4l2_ctrl_g_ctrl(link_freq);
> +	ret = v4l2_querymenu(sensor_sd->ctrl_handler, &qm);
> +	if (ret < 0) {
> +		v4l2_err(sd, "Failed to get menu item\n");
> +		return ret;
> +	}
> +
> +	if (!qm.value) {
> +		v4l2_err(sd, "Invalid link_freq\n");
> +		return -EINVAL;
> +	}
> +	priv->data_rate_mbps = qm.value * 2;
> +	do_div(priv->data_rate_mbps, 1000 * 1000);
> +
> +	return 0;
> +}
> +
> +static int mipidphy_s_stream_start(struct v4l2_subdev *sd)
> +{
> +	struct mipidphy_priv *priv = to_dphy_priv(sd);
> +	const struct dphy_drv_data *drv_data = priv->drv_data;
> +	const struct hsfreq_range *hsfreq_ranges = drv_data->hsfreq_ranges;
> +	int num_hsfreq_ranges = drv_data->num_hsfreq_ranges;
> +	struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
> +	struct mipidphy_sensor *sensor = sd_to_sensor(priv, sensor_sd);
> +	int i, ret, hsfreq = 0;
> +
> +	if (priv->is_streaming)
> +		return 0;
> +
> +	ret = mipidphy_get_sensor_data_rate(sd);
> +	if (ret < 0)
> +		return ret;
> +
> +	for (i = 0; i < num_hsfreq_ranges; i++) {
> +		if (hsfreq_ranges[i].range_h >= priv->data_rate_mbps) {
> +			hsfreq = hsfreq_ranges[i].cfg_bit;
> +			break;
> +		}
> +	}
> +
> +	write_reg(priv, GRF_DPHY_RX0_FORCERXMODE, 0);
> +	write_reg(priv, GRF_DPHY_RX0_FORCETXSTOPMODE, 0);
> +	/* Disable lan turn around, which is ignored in receive mode */
> +	write_reg(priv, GRF_DPHY_RX0_TURNREQUEST, 0);
> +	write_reg(priv, GRF_DPHY_RX0_TURNDISABLE, 0xf);
> +
> +	write_reg(priv, GRF_DPHY_RX0_ENABLE, GENMASK(sensor->lanes - 1, 0));
> +
> +	/* dphy start */
> +	write_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
> +	write_reg(priv, GRF_DPHY_RX0_TESTCLR, 1);
> +	usleep_range(100, 150);
> +	write_reg(priv, GRF_DPHY_RX0_TESTCLR, 0);
> +	usleep_range(100, 150);
> +
> +	/* set clock lane */
> +	/* HS hsfreq_range & lane 0  settle bypass */
> +	mipidphy_wr_reg(priv, CLOCK_LANE_HS_RX_CONTROL, 0);
> +	/* HS RX Control of lane0 */
> +	mipidphy_wr_reg(priv, LANE0_HS_RX_CONTROL, hsfreq << 1);
> +	/* HS RX Control of lane1 */
> +	mipidphy_wr_reg(priv, LANE1_HS_RX_CONTROL, 0);
> +	/* HS RX Control of lane2 */
> +	mipidphy_wr_reg(priv, LANE2_HS_RX_CONTROL, 0);
> +	/* HS RX Control of lane3 */
> +	mipidphy_wr_reg(priv, LANE3_HS_RX_CONTROL, 0);
> +	/* HS RX Data Lanes Settle State Time Control */
> +	mipidphy_wr_reg(priv, HS_RX_DATA_LANES_THS_SETTLE__CONTROL, 0x04);
> +
> +	/* Normal operation */
> +	mipidphy_wr_reg(priv, 0x0, 0);
> +
> +	priv->is_streaming = true;
> +
> +	return 0;
> +}
> +
> +static int mipidphy_s_stream_stop(struct v4l2_subdev *sd)
> +{
> +	struct mipidphy_priv *priv = to_dphy_priv(sd);
> +
> +	if (!priv->is_streaming)
> +		return 0;

You can drop this if. The end result is always the same :-)

> +
> +	priv->is_streaming = false;
> +
> +	return 0;
> +}
> +
> +static int mipidphy_s_stream(struct v4l2_subdev *sd, int on)
> +{
> +	if (on)
> +		return mipidphy_s_stream_start(sd);
> +	else
> +		return mipidphy_s_stream_stop(sd);
> +}
> +
> +static int mipidphy_g_mbus_config(struct v4l2_subdev *sd,
> +				  struct v4l2_mbus_config *config)
> +{
> +	struct mipidphy_priv *priv = to_dphy_priv(sd);
> +	struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
> +	struct mipidphy_sensor *sensor = sd_to_sensor(priv, sensor_sd);
> +
> +	*config = sensor->mbus;
> +
> +	return 0;
> +}

Please drop this. g_mbus_config is deprecated and should not be used
in new drivers. It dates from a pre-device-tree era and these days we
use the device tree instead.

> +
> +static int mipidphy_s_power(struct v4l2_subdev *sd, int on)
> +{
> +	struct mipidphy_priv *priv = to_dphy_priv(sd);
> +
> +	if (on)
> +		return pm_runtime_get_sync(priv->dev);
> +	else
> +		return pm_runtime_put(priv->dev);
> +}
> +
> +static int mipidphy_runtime_suspend(struct device *dev)
> +{
> +	struct media_entity *me = dev_get_drvdata(dev);
> +	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
> +	struct mipidphy_priv *priv = to_dphy_priv(sd);
> +	int i, num_clks;
> +
> +	num_clks = priv->drv_data->num_clks;
> +	for (i = num_clks - 1; i >= 0; i--)
> +		clk_disable_unprepare(priv->clks[i]);
> +
> +	return 0;
> +}
> +
> +static int mipidphy_runtime_resume(struct device *dev)
> +{
> +	struct media_entity *me = dev_get_drvdata(dev);
> +	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
> +	struct mipidphy_priv *priv = to_dphy_priv(sd);
> +	int i, num_clks, ret;
> +
> +	num_clks = priv->drv_data->num_clks;
> +	for (i = 0; i < num_clks; i++) {
> +		ret = clk_prepare_enable(priv->clks[i]);
> +		if (ret < 0)
> +			goto err;
> +	}
> +
> +	return 0;
> +err:
> +	while (--i >= 0)
> +		clk_disable_unprepare(priv->clks[i]);
> +	return ret;
> +}
> +
> +/* dphy accepts all fmt/size from sensor */
> +static int mipidphy_get_set_fmt(struct v4l2_subdev *sd,
> +				struct v4l2_subdev_pad_config *cfg,
> +				struct v4l2_subdev_format *fmt)
> +{
> +	struct v4l2_subdev *sensor = get_remote_sensor(sd);
> +
> +	/*
> +	 * Do not allow format changes and just relay whatever
> +	 * set currently in the sensor.
> +	 */
> +	return v4l2_subdev_call(sensor, pad, get_fmt, NULL, fmt);
> +}
> +
> +static const struct v4l2_subdev_pad_ops mipidphy_subdev_pad_ops = {
> +	.set_fmt = mipidphy_get_set_fmt,
> +	.get_fmt = mipidphy_get_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_core_ops mipidphy_core_ops = {
> +	.s_power = mipidphy_s_power,
> +};
> +
> +static const struct v4l2_subdev_video_ops mipidphy_video_ops = {
> +	.g_mbus_config = mipidphy_g_mbus_config,
> +	.s_stream = mipidphy_s_stream,
> +};
> +
> +static const struct v4l2_subdev_ops mipidphy_subdev_ops = {
> +	.core = &mipidphy_core_ops,
> +	.video = &mipidphy_video_ops,
> +	.pad = &mipidphy_subdev_pad_ops,
> +};
> +
> +/* These tables must be sorted by .range_h ascending. */
> +static const struct hsfreq_range rk3288_mipidphy_hsfreq_ranges[] = {
> +	{  89, 0x00}, {  99, 0x10}, { 109, 0x20}, { 129, 0x01},
> +	{ 139, 0x11}, { 149, 0x21}, { 169, 0x02}, { 179, 0x12},
> +	{ 199, 0x22}, { 219, 0x03}, { 239, 0x13}, { 249, 0x23},
> +	{ 269, 0x04}, { 299, 0x14}, { 329, 0x05}, { 359, 0x15},
> +	{ 399, 0x25}, { 449, 0x06}, { 499, 0x16}, { 549, 0x07},
> +	{ 599, 0x17}, { 649, 0x08}, { 699, 0x18}, { 749, 0x09},
> +	{ 799, 0x19}, { 849, 0x29}, { 899, 0x39}, { 949, 0x0a},
> +	{ 999, 0x1a}
> +};
> +
> +static const struct hsfreq_range rk3399_mipidphy_hsfreq_ranges[] = {
> +	{  89, 0x00}, {  99, 0x10}, { 109, 0x20}, { 129, 0x01},
> +	{ 139, 0x11}, { 149, 0x21}, { 169, 0x02}, { 179, 0x12},
> +	{ 199, 0x22}, { 219, 0x03}, { 239, 0x13}, { 249, 0x23},
> +	{ 269, 0x04}, { 299, 0x14}, { 329, 0x05}, { 359, 0x15},
> +	{ 399, 0x25}, { 449, 0x06}, { 499, 0x16}, { 549, 0x07},
> +	{ 599, 0x17}, { 649, 0x08}, { 699, 0x18}, { 749, 0x09},
> +	{ 799, 0x19}, { 849, 0x29}, { 899, 0x39}, { 949, 0x0a},
> +	{ 999, 0x1a}, {1049, 0x2a}, {1099, 0x3a}, {1149, 0x0b},
> +	{1199, 0x1b}, {1249, 0x2b}, {1299, 0x3b}, {1349, 0x0c},
> +	{1399, 0x1c}, {1449, 0x2c}, {1500, 0x3c}
> +};
> +
> +static const char * const rk3399_mipidphy_clks[] = {
> +	"dphy-ref",
> +	"dphy-cfg",
> +	"grf",
> +};
> +
> +static const char * const rk3288_mipidphy_clks[] = {
> +	"dphy-ref",
> +	"pclk",
> +};
> +
> +static const struct dphy_drv_data rk3288_mipidphy_drv_data = {
> +	.clks = rk3288_mipidphy_clks,
> +	.num_clks = ARRAY_SIZE(rk3288_mipidphy_clks),
> +	.hsfreq_ranges = rk3288_mipidphy_hsfreq_ranges,
> +	.num_hsfreq_ranges = ARRAY_SIZE(rk3288_mipidphy_hsfreq_ranges),
> +	.regs = rk3288_grf_dphy_regs,
> +};
> +
> +static const struct dphy_drv_data rk3399_mipidphy_drv_data = {
> +	.clks = rk3399_mipidphy_clks,
> +	.num_clks = ARRAY_SIZE(rk3399_mipidphy_clks),
> +	.hsfreq_ranges = rk3399_mipidphy_hsfreq_ranges,
> +	.num_hsfreq_ranges = ARRAY_SIZE(rk3399_mipidphy_hsfreq_ranges),
> +	.regs = rk3399_grf_dphy_regs,
> +};
> +
> +static const struct of_device_id rockchip_mipidphy_match_id[] = {
> +	{
> +		.compatible = "rockchip,rk3399-mipi-dphy",
> +		.data = &rk3399_mipidphy_drv_data,
> +	},
> +	{
> +		.compatible = "rockchip,rk3288-mipi-dphy",
> +		.data = &rk3288_mipidphy_drv_data,
> +	},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, rockchip_mipidphy_match_id);
> +
> +/* The .bound() notifier callback when a match is found */
> +static int
> +rockchip_mipidphy_notifier_bound(struct v4l2_async_notifier *notifier,
> +				 struct v4l2_subdev *sd,
> +				 struct v4l2_async_subdev *asd)
> +{
> +	struct mipidphy_priv *priv = container_of(notifier,
> +						  struct mipidphy_priv,
> +						  notifier);
> +	struct sensor_async_subdev *s_asd = container_of(asd,
> +					struct sensor_async_subdev, asd);
> +	struct mipidphy_sensor *sensor;
> +	unsigned int pad, ret;
> +
> +	if (priv->num_sensors == ARRAY_SIZE(priv->sensors))
> +		return -EBUSY;
> +
> +	sensor = &priv->sensors[priv->num_sensors++];
> +	sensor->lanes = s_asd->lanes;
> +	sensor->mbus = s_asd->mbus;
> +	sensor->sd = sd;
> +
> +	for (pad = 0; pad < sensor->sd->entity.num_pads; pad++)
> +		if (sensor->sd->entity.pads[pad].flags
> +					& MEDIA_PAD_FL_SOURCE)
> +			break;
> +
> +	if (pad == sensor->sd->entity.num_pads) {
> +		dev_err(priv->dev,
> +			"failed to find src pad for %s\n",
> +			sensor->sd->name);
> +
> +		return -ENXIO;
> +	}
> +
> +	ret = media_create_pad_link(
> +			&sensor->sd->entity, pad,
> +			&priv->sd.entity, MIPI_DPHY_SY_PAD_SINK,
> +			priv->num_sensors != 1 ? 0 : MEDIA_LNK_FL_ENABLED);
> +	if (ret) {
> +		dev_err(priv->dev,
> +			"failed to create link for %s\n",
> +			sensor->sd->name);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +/* The .unbind callback */
> +static void
> +rockchip_mipidphy_notifier_unbind(struct v4l2_async_notifier *notifier,
> +				  struct v4l2_subdev *sd,
> +				  struct v4l2_async_subdev *asd)
> +{
> +	struct mipidphy_priv *priv = container_of(notifier,
> +						  struct mipidphy_priv,
> +						  notifier);
> +	struct mipidphy_sensor *sensor = sd_to_sensor(priv, sd);
> +
> +	sensor->sd = NULL;
> +}
> +
> +static const struct
> +v4l2_async_notifier_operations rockchip_mipidphy_async_ops = {
> +	.bound = rockchip_mipidphy_notifier_bound,
> +	.unbind = rockchip_mipidphy_notifier_unbind,
> +};
> +
> +static int rockchip_mipidphy_fwnode_parse(struct device *dev,
> +			     struct v4l2_fwnode_endpoint *vep,
> +			     struct v4l2_async_subdev *asd)
> +{
> +	struct sensor_async_subdev *s_asd =
> +			container_of(asd, struct sensor_async_subdev, asd);
> +	struct v4l2_mbus_config *config = &s_asd->mbus;
> +
> +	if (vep->bus_type != V4L2_MBUS_CSI2) {
> +		dev_err(dev, "Only CSI2 bus type is currently supported\n");
> +		return -EINVAL;
> +	}
> +
> +	if (vep->base.port != 0) {
> +		dev_err(dev, "The PHY has only port 0\n");
> +		return -EINVAL;
> +	}
> +
> +	config->type = V4L2_MBUS_CSI2;
> +	config->flags = vep->bus.mipi_csi2.flags;
> +	s_asd->lanes = vep->bus.mipi_csi2.num_data_lanes;
> +
> +	switch (vep->bus.mipi_csi2.num_data_lanes) {
> +	case 1:
> +		config->flags |= V4L2_MBUS_CSI2_1_LANE;
> +		break;
> +	case 2:
> +		config->flags |= V4L2_MBUS_CSI2_2_LANE;
> +		break;
> +	case 3:
> +		config->flags |= V4L2_MBUS_CSI2_3_LANE;
> +		break;
> +	case 4:
> +		config->flags |= V4L2_MBUS_CSI2_4_LANE;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rockchip_mipidphy_media_init(struct mipidphy_priv *priv)
> +{
> +	int ret;
> +
> +	priv->pads[MIPI_DPHY_SY_PAD_SOURCE].flags =
> +		MEDIA_PAD_FL_SOURCE | MEDIA_PAD_FL_MUST_CONNECT;
> +	priv->pads[MIPI_DPHY_SY_PAD_SINK].flags =
> +		MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
> +
> +	ret = media_entity_pads_init(&priv->sd.entity,
> +				 MIPI_DPHY_SY_PADS_NUM, priv->pads);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
> +		priv->dev, &priv->notifier,
> +		sizeof(struct sensor_async_subdev), 0,
> +		rockchip_mipidphy_fwnode_parse);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (!priv->notifier.num_subdevs)
> +		return -ENODEV;	/* no endpoint */
> +
> +	priv->sd.subdev_notifier = &priv->notifier;
> +	priv->notifier.ops = &rockchip_mipidphy_async_ops;
> +	ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier);
> +	if (ret) {
> +		dev_err(priv->dev,
> +			"failed to register async notifier : %d\n", ret);
> +		v4l2_async_notifier_cleanup(&priv->notifier);
> +		return ret;
> +	}
> +
> +	return v4l2_async_register_subdev(&priv->sd);
> +}
> +
> +static int rockchip_mipidphy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct v4l2_subdev *sd;
> +	struct mipidphy_priv *priv;
> +	struct regmap *grf;
> +	const struct of_device_id *of_id;
> +	const struct dphy_drv_data *drv_data;
> +	int i, ret;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +	priv->dev = dev;
> +
> +	of_id = of_match_device(rockchip_mipidphy_match_id, dev);
> +	if (!of_id)
> +		return -EINVAL;
> +
> +	grf = syscon_node_to_regmap(dev->parent->of_node);
> +	if (IS_ERR(grf)) {
> +		dev_err(dev, "Can't find GRF syscon\n");
> +		return -ENODEV;
> +	}
> +	priv->regmap_grf = grf;
> +
> +	drv_data = of_id->data;
> +	for (i = 0; i < drv_data->num_clks; i++) {
> +		priv->clks[i] = devm_clk_get(dev, drv_data->clks[i]);
> +
> +		if (IS_ERR(priv->clks[i])) {
> +			dev_err(dev, "Failed to get %s\n", drv_data->clks[i]);
> +			return PTR_ERR(priv->clks[i]);
> +		}
> +	}
> +
> +	priv->grf_regs = drv_data->regs;
> +	priv->drv_data = drv_data;
> +
> +	sd = &priv->sd;
> +	v4l2_subdev_init(sd, &mipidphy_subdev_ops);
> +	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	snprintf(sd->name, sizeof(sd->name), "rockchip-sy-mipi-dphy");
> +	sd->dev = dev;
> +
> +	platform_set_drvdata(pdev, &sd->entity);
> +
> +	ret = rockchip_mipidphy_media_init(priv);
> +	if (ret < 0)
> +		return ret;
> +
> +	pm_runtime_enable(&pdev->dev);
> +
> +	return 0;
> +}
> +
> +static int rockchip_mipidphy_remove(struct platform_device *pdev)
> +{
> +	struct media_entity *me = platform_get_drvdata(pdev);
> +	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
> +
> +	media_entity_cleanup(&sd->entity);
> +
> +	pm_runtime_disable(&pdev->dev);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops rockchip_mipidphy_pm_ops = {
> +	SET_RUNTIME_PM_OPS(mipidphy_runtime_suspend,
> +			   mipidphy_runtime_resume, NULL)
> +};
> +
> +static struct platform_driver rockchip_isp_mipidphy_driver = {
> +	.probe = rockchip_mipidphy_probe,
> +	.remove = rockchip_mipidphy_remove,
> +	.driver = {
> +			.name = "rockchip-sy-mipi-dphy",
> +			.pm = &rockchip_mipidphy_pm_ops,
> +			.of_match_table = rockchip_mipidphy_match_id,
> +	},
> +};
> +
> +module_platform_driver(rockchip_isp_mipidphy_driver);
> +MODULE_AUTHOR("Rockchip Camera/ISP team");
> +MODULE_DESCRIPTION("Rockchip MIPI DPHY driver");
> +MODULE_LICENSE("Dual BSD/GPL");
> 

Regards,

	Hans

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