Message-ID: <66926554-86b2-1ae4-2ff2-e11ac254762e@synopsys.com>
Date:   Mon, 27 Nov 2017 14:15:53 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Jacob Chen <jacob-chen@...wrt.com>,
        <linux-rockchip@...ts.infradead.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <mchehab@...nel.org>,
        <linux-media@...r.kernel.org>, <sakari.ailus@...ux.intel.com>,
        <hans.verkuil@...co.com>, <tfiga@...omium.org>,
        <zhengsq@...k-chips.com>, <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>, Jacob Chen <jacob2.chen@...k-chips.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        "Luis de Oliveira" <Luis.Oliveira@...opsys.com>
Subject: Re: [PATCH v2 04/11] media: rkisp1: add Rockchip MIPI Synopsys DPHY
 driver

++ Joao, ++ Luis

Hi Hans,

We will take a look into this. Thanks for pointing this out!

Best Regards,
Jose Miguel Abreu

On 27-11-2017 12:01, Hans Verkuil wrote:
> I'm CC-ing Jose Abreu from Synopsys to this. Jose, can you or a colleague take
> a look at this as well?
>
> Jacob, I have some high-level questions first:
>
> 1) to what extend is this code rockchip-specific as opposed to be more synopsys-generic?
>
> 2) I don't quite see how this works when there are two sensors. Is only one active at a
>    time? Or are they multiplexed somehow?
>
> 3) Same as for the previous patch: some more comments would be welcome.
>
> On 11/24/2017 03:36 AM, Jacob Chen wrote:
>> From: Jacob Chen <jacob2.chen@...k-chips.com>
>>
>> This commit adds a subdev driver for Rockchip MIPI Synopsys DPHY driver.
>>
>> The phy driver is kind of independent compare to the other parts, but i'd like
>> to keep it in rkisp1 driver, unless people want to generalize it
>>
>> 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>
>> ---
>>  drivers/media/platform/rockchip/isp1/Makefile      |   1 +
>>  .../media/platform/rockchip/isp1/mipi_dphy_sy.c    | 805 +++++++++++++++++++++
>>  2 files changed, 806 insertions(+)
>>  create mode 100644 drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
>>
>> diff --git a/drivers/media/platform/rockchip/isp1/Makefile b/drivers/media/platform/rockchip/isp1/Makefile
>> index 8f52f959398e..18af64853734 100644
>> --- a/drivers/media/platform/rockchip/isp1/Makefile
>> +++ b/drivers/media/platform/rockchip/isp1/Makefile
>> @@ -4,4 +4,5 @@ video_rkisp1-objs 	   += 	rkisp1.o \
>>  				regs.o \
>>  				isp_stats.o \
>>  				isp_params.o \
>> +				mipi_dphy_sy.o \
>>  				capture.o
>> 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 000000000000..56deff2be6fd
>> --- /dev/null
>> +++ b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
>> @@ -0,0 +1,805 @@
>> +/*
>> + * 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.
>> + */
>> +
>> +#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;
>> +
>> +	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;
>> +}
>> +
>> +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,
> Why do you need this?
>
>> +	.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;
>> +
>> +	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;
>> +
>> +	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;
>> +}
>> +
>> +/* .complete() is called after all subdevices have been located */
>> +static int
>> +rockchip_mipidphy_notifier_complete(struct v4l2_async_notifier *notifier)
>> +{
>> +	struct mipidphy_priv *priv = container_of(notifier,
>> +						  struct mipidphy_priv,
>> +						  notifier);
>> +	unsigned int pad;
>> +	int ret;
>> +	int i;
>> +
>> +	for (i = 0; i < priv->num_sensors; ++i) {
>> +		struct mipidphy_sensor *sensor = &priv->sensors[i];
>> +
>> +		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,
>> +				i ? 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;
>> +}
>> +
>> +static const
>> +struct v4l2_async_notifier_operationsrockchip_mipidphy_async_ops = {
>> +	.bound = rockchip_mipidphy_notifier_bound,
>> +	.unbind = rockchip_mipidphy_notifier_unbind,
>> +	.complete = rockchip_mipidphy_notifier_complete,
>> +};
>> +
>> +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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