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Message-ID: <b3729ba2-57b4-4a17-941d-61798baef571@collabora.com>
Date: Wed, 21 Feb 2024 11:45:32 +0100
From: Julien Massot <julien.massot@...labora.com>
To: Sakari Ailus <sakari.ailus@....fi>
Cc: linux-media@...r.kernel.org, kernel@...labora.com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
mchehab@...nel.org, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
conor+dt@...nel.org
Subject: Re: [PATCH v3 4/4] media: i2c: add MAX96714 driver
Hi Sakari,
On 2/9/24 16:49, Sakari Ailus wrote:
> Hi Julien,
>
> On Thu, Jan 11, 2024 at 02:03:49PM +0100, Julien Massot wrote:
>> This driver handle the MAX96714 deserializer in tunnel mode.
>> The CSI output will replicate all the CSI traffic forwarded by
>> the remote serializer.
>>
>> Signed-off-by: Julien Massot <julien.massot@...labora.com>
>> ---
>> Change since v2:
>> - Use CCI helpers instead of recoding register access
>> - add missing bitfield header
>> - Add pattern generator so the deserializer can be tested without a serializer/sensor
>> ---
>> MAINTAINERS | 7 +
>> drivers/media/i2c/Kconfig | 13 +
>> drivers/media/i2c/Makefile | 1 +
>> drivers/media/i2c/max96714.c | 1077 ++++++++++++++++++++++++++++++++++
>> 4 files changed, 1098 insertions(+)
>> create mode 100644 drivers/media/i2c/max96714.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index a64a7932fe76..a7691d38513a 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -13039,6 +13039,13 @@ S: Maintained
>> F: Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml
>> F: drivers/staging/media/max96712/max96712.c
>>
>> +MAX96714 GMSL2 DESERIALIZER DRIVER
>> +M: Julien Massot <julien.massot@...labora.com>
>> +L: linux-media@...r.kernel.org
>> +S: Maintained
>> +F: Documentation/devicetree/bindings/media/i2c/maxim,max96714f.yaml
>> +F: drivers/media/i2c/max96714.c
>> +
>> MAX96717 GMSL2 SERIALIZER DRIVER
>> M: Julien Massot <julien.massot@...labora.com>
>> L: linux-media@...r.kernel.org
>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
>> index 64f6a35f4481..d0dfab513154 100644
>> --- a/drivers/media/i2c/Kconfig
>> +++ b/drivers/media/i2c/Kconfig
>> @@ -1570,6 +1570,19 @@ config VIDEO_DS90UB960
>> Device driver for the Texas Instruments DS90UB960
>> FPD-Link III Deserializer and DS90UB9702 FPD-Link IV Deserializer.
>>
>> +config VIDEO_MAX96714
>> + tristate "Maxim MAX96714 GMSL2 deserializer"
>> + depends on OF && I2C && VIDEO_DEV
>> + select I2C_MUX
>> + select GPIOLIB
>> + select V4L2_CCI_I2C
>> + help
>> + Device driver for the Maxim MAX96714
>> + GMSL2 Deserializer.
>> +
>> + To compile this driver as a module, choose M here: the
>> + module will be called max96714.
>> +
>> config VIDEO_MAX96717
>> tristate "Maxim MAX96717 GMSL2 Serializer support"
>> depends on OF && I2C && VIDEO_DEV && COMMON_CLK
>> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
>> index 9e007116f929..7c794441eaff 100644
>> --- a/drivers/media/i2c/Makefile
>> +++ b/drivers/media/i2c/Makefile
>> @@ -64,6 +64,7 @@ obj-$(CONFIG_VIDEO_LM3646) += lm3646.o
>> obj-$(CONFIG_VIDEO_M52790) += m52790.o
>> obj-$(CONFIG_VIDEO_MAX9271_LIB) += max9271.o
>> obj-$(CONFIG_VIDEO_MAX9286) += max9286.o
>> +obj-$(CONFIG_VIDEO_MAX96714) += max96714.o
>> obj-$(CONFIG_VIDEO_MAX96717) += max96717.o
>> obj-$(CONFIG_VIDEO_ML86V7667) += ml86v7667.o
>> obj-$(CONFIG_VIDEO_MSP3400) += msp3400.o
>> diff --git a/drivers/media/i2c/max96714.c b/drivers/media/i2c/max96714.c
>> new file mode 100644
>> index 000000000000..8bf1f5babf5d
>> --- /dev/null
>> +++ b/drivers/media/i2c/max96714.c
>> @@ -0,0 +1,1077 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Maxim GMSL2 Deserializer Driver
>> + *
>> + * Copyright (C) 2024 Collabora Ltd.
>> + */
>> +
>> +#include <linux/bitfield.h>
>> +#include <linux/bitops.h>
>> +#include <linux/fwnode.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/i2c.h>
>> +#include <linux/i2c-mux.h>
>> +#include <linux/module.h>
>> +#include <linux/regmap.h>
>> +#include <linux/regulator/consumer.h>
>> +
>> +#include <media/v4l2-cci.h>
>> +#include <media/v4l2-ctrls.h>
>> +#include <media/v4l2-fwnode.h>
>> +#include <media/v4l2-subdev.h>
>> +
>> +#define MAX96714F_DEVICE_ID 0xca
>> +#define MAX96714_NPORTS 2
>> +#define MAX96714_PAD_SINK 0
>> +#define MAX96714_PAD_SOURCE 1
>> +
>> +/* DEV */
>> +#define MAX96714_REG13 CCI_REG8(0x0d)
>> +#define MAX96714_DEV_REV CCI_REG8(0x0e)
>> +#define MAX96714_DEV_REV_MASK GENMASK(3, 0)
>> +#define MAX96714_LINK_LOCK CCI_REG8(0x13)
>> +#define MAX96714_LINK_LOCK_BIT BIT(3)
>> +#define MAX96714_IO_CHK0 CCI_REG8(0x38)
>> +#define MAX96714_PATTERN_CLK_FREQ GENMASK(1, 0)
>> +/* VID_RX */
>> +#define MAX96714_VIDEO_RX8 CCI_REG8(0x11a)
>> +#define MAX96714_VID_LOCK BIT(6)
>> +
>> +/* VRX_PATGEN_0 */
>> +#define MAX96714_PATGEN_0 CCI_REG8(0x240)
>> +#define MAX96714_PATGEN_1 CCI_REG8(0x241)
>> +#define MAX96714_PATGEN_MODE GENMASK(5, 4)
>> +#define MAX96714_PATGEN_VS_DLY CCI_REG24(0x242)
>> +#define MAX96714_PATGEN_VS_HIGH CCI_REG24(0x245)
>> +#define MAX96714_PATGEN_VS_LOW CCI_REG24(0x248)
>> +#define MAX96714_PATGEN_V2H CCI_REG24(0x24b)
>> +#define MAX96714_PATGEN_HS_HIGH CCI_REG16(0x24e)
>> +#define MAX96714_PATGEN_HS_LOW CCI_REG16(0x250)
>> +#define MAX96714_PATGEN_HS_CNT CCI_REG16(0x252)
>> +#define MAX96714_PATGEN_V2D CCI_REG24(0x254)
>> +#define MAX96714_PATGEN_DE_HIGH CCI_REG16(0x257)
>> +#define MAX96714_PATGEN_DE_LOW CCI_REG16(0x259)
>> +#define MAX96714_PATGEN_DE_CNT CCI_REG16(0x25B)
>> +#define MAX96714_PATGEN_GRAD_INC CCI_REG8(0x25d)
>> +#define MAX96714_PATGEN_CHKB_COLOR_A CCI_REG24(0x25E)
>> +#define MAX96714_PATGEN_CHKB_COLOR_B CCI_REG24(0x261)
>> +#define MAX96714_PATGEN_CHKB_RPT_CNT_A CCI_REG8(0x264)
>> +#define MAX96714_PATGEN_CHKB_RPT_CNT_B CCI_REG8(0x265)
>> +#define MAX96714_PATGEN_CHKB_ALT CCI_REG8(0x266)
>> +/* BACKTOP */
>> +#define MAX96714_BACKTOP25 CCI_REG8(0x320)
>> +#define CSI_DPLL_FREQ_MASK GENMASK(4, 0)
>> +
>> +/* MIPI_PHY */
>> +#define MAX96714_MIPI_PHY0 CCI_REG8(0x330)
>> +#define MAX96714_FORCE_CSI_OUT BIT(7)
>> +#define MAX96714_MIPI_STDBY_N CCI_REG8(0x332)
>> +#define MAX96714_MIPI_STDBY_MASK GENMASK(5, 4)
>> +#define MAX96714_MIPI_LANE_MAP CCI_REG8(0x333)
>> +#define MAX96714_MIPI_POLARITY CCI_REG8(0x335)
>> +#define MAX96714_MIPI_POLARITY_MASK GENMASK(5, 0)
>> +
>> +/* MIPI_TX */
>> +#define MAX96714_MIPI_LANE_CNT CCI_REG8(0x44a)
>> +#define MAX96714_CSI2_LANE_CNT_MASK GENMASK(7, 6)
>> +#define MAX96714_MIPI_TX52 CCI_REG8(0x474)
>> +#define MAX96714_TUN_EN BIT(0)
>
> It'd be nice to align the macro expansions above.
Ok will do
>
>> +
>> +#define MHZ(v) ((u32)((v) * 1000000U))
>> +
>> +enum max96714_vpg_mode {
>> + MAX96714_VPG_DISABLED = 0,
>> + MAX96714_VPG_CHECKERBOARD = 1,
>> + MAX96714_VPG_GRADIENT = 2,
>> +};
>> +
>> +struct max96714_rxport {
>> + struct {
>> + struct v4l2_subdev *sd;
>> + u16 pad;
>> + struct fwnode_handle *ep_fwnode;
>> + } source;
>> + struct regulator *poc;
>> +};
>> +
>> +struct max96714_txport {
>> + struct v4l2_fwnode_endpoint vep;
>> +};
>> +
>> +struct max96714_priv {
>> + struct i2c_client *client;
>> + struct regmap *regmap;
>> + struct gpio_desc *pd_gpio;
>> + struct max96714_rxport rxport;
>> + struct i2c_mux_core *mux;
>> + u64 enabled_source_streams;
>> + struct v4l2_subdev sd;
>> + struct media_pad pads[MAX96714_NPORTS];
>> + struct v4l2_fwnode_endpoint vep;
>> + struct v4l2_ctrl_handler ctrl_handler;
>> + struct v4l2_async_notifier notifier;
>> + s64 tx_link_freq;
>> + enum max96714_vpg_mode pattern;
>> +};
>> +
>> +static struct regmap_config max96714_regmap_config = {
>> + .name = "max96714",
>> + .reg_bits = 16,
>> + .val_bits = 8,
>> + .max_register = 0xFFFF,
>> +};
>> +
>> +static inline struct max96714_priv *sd_to_max96714(struct v4l2_subdev *sd)
>> +{
>> + return container_of(sd, struct max96714_priv, sd);
>> +}
>> +
>> +static int max96714_enable_tx_port(struct max96714_priv *priv)
>> +{
>> + return cci_update_bits(priv->regmap, MAX96714_MIPI_STDBY_N,
>> + MAX96714_MIPI_STDBY_MASK,
>> + MAX96714_MIPI_STDBY_MASK, NULL);
>> +}
>> +
>> +static int max96714_disable_tx_port(struct max96714_priv *priv)
>> +{
>> + return cci_update_bits(priv->regmap, MAX96714_MIPI_STDBY_N,
>> + MAX96714_MIPI_STDBY_MASK, 0, NULL);
>> +}
>> +
>> +static bool max96714_tx_port_enabled(struct max96714_priv *priv)
>> +{
>> + u64 val;
>> +
>> + cci_read(priv->regmap, MAX96714_MIPI_STDBY_N, &val, NULL);
>> +
>> + return val & MAX96714_MIPI_STDBY_MASK;
>> +}
>> +
>> +static int max96714_apply_patgen_timing(struct max96714_priv *priv,
>> + struct v4l2_subdev_state *state)
>> +{
>> + struct v4l2_mbus_framefmt *fmt =
>> + v4l2_subdev_state_get_format(state, MAX96714_PAD_SOURCE);
>> + const u32 h_active = fmt->width;
>> + const u32 h_fp = 88;
>> + const u32 h_sw = 44;
>> + const u32 h_bp = 148;
>> + u32 h_tot;
>> +
>> + const u32 v_active = fmt->height;
>> + const u32 v_fp = 4;
>> + const u32 v_sw = 5;
>> + const u32 v_bp = 36;
>> + u32 v_tot;
>> + int ret = 0;
>> +
>> + h_tot = h_active + h_fp + h_sw + h_bp;
>> + v_tot = v_active + v_fp + v_sw + v_bp;
>> +
>> + /* 75 Mhz pixel clock */
>> + cci_update_bits(priv->regmap, MAX96714_IO_CHK0,
>> + MAX96714_PATTERN_CLK_FREQ, 1, &ret);
>> +
>> + dev_info(&priv->client->dev, "height: %d width: %d\n", fmt->height,
>> + fmt->width);
>> +
>> + cci_write(priv->regmap, MAX96714_PATGEN_VS_DLY, 0, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_VS_HIGH, v_sw * h_tot, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_VS_LOW,
>> + (v_active + v_fp + v_bp) * h_tot, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_HS_HIGH, h_sw, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_HS_LOW, h_active + h_fp + h_bp,
>> + &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_V2D,
>> + h_tot * (v_sw + v_bp) + (h_sw + h_bp), &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_HS_CNT, v_tot, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_DE_HIGH, h_active, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_DE_LOW, h_fp + h_sw + h_bp,
>> + &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_DE_CNT, v_active, &ret);
>> + /* B G R */
>> + cci_write(priv->regmap, MAX96714_PATGEN_CHKB_COLOR_A, 0xfecc00, &ret);
>> + /* B G R */
>> + cci_write(priv->regmap, MAX96714_PATGEN_CHKB_COLOR_B, 0x006aa7, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_CHKB_RPT_CNT_A, 0x3c, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_CHKB_RPT_CNT_B, 0x3c, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_CHKB_ALT, 0x3c, &ret);
>> + cci_write(priv->regmap, MAX96714_PATGEN_GRAD_INC, 0x10, &ret);
>> +
>> + return ret;
>> +}
>> +
>> +static int max96714_apply_patgen(struct max96714_priv *priv,
>> + struct v4l2_subdev_state *state)
>> +{
>> + int ret = 0;
>> + u8 val;
>> +
>> + if (priv->pattern)
>> + ret = max96714_apply_patgen_timing(priv, state);
>> +
>> + cci_write(priv->regmap, MAX96714_PATGEN_0, priv->pattern ? 0xfb : 0,
>> + &ret);
>> +
>> + val = FIELD_PREP(MAX96714_PATGEN_MODE, priv->pattern);
>> + cci_update_bits(priv->regmap, MAX96714_PATGEN_1, MAX96714_PATGEN_MODE,
>> + val, &ret);
>> + return ret;
>> +}
>> +
>> +static int max96714_s_ctrl(struct v4l2_ctrl *ctrl)
>> +{
>> + struct max96714_priv *priv =
>> + container_of(ctrl->handler, struct max96714_priv, ctrl_handler);
>> + int ret;
>> +
>> + switch (ctrl->id) {
>> + case V4L2_CID_TEST_PATTERN:
>> + priv->pattern = ctrl->val;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + ret = cci_update_bits(priv->regmap, MAX96714_MIPI_PHY0,
>> + MAX96714_FORCE_CSI_OUT,
>> + priv->pattern ? MAX96714_FORCE_CSI_OUT : 0, NULL);
>> +
>> + /* Pattern generator doesn't work with tunnel mode */
>> + return cci_update_bits(priv->regmap, MAX96714_MIPI_TX52,
>> + MAX96714_TUN_EN,
>> + priv->pattern ? 0 : MAX96714_TUN_EN, &ret);
>> +}
>> +
>> +static const char * const max96714_test_pattern[] = {
>> + "Disabled",
>> + "Checkerboard",
>> + "Gradient"
>> +};
>> +
>> +static const struct v4l2_ctrl_ops max96714_ctrl_ops = {
>> + .s_ctrl = max96714_s_ctrl,
>> +};
>> +
>> +static int max96714_enable_streams(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_state *state,
>> + u32 source_pad, u64 streams_mask)
>> +{
>> + struct max96714_priv *priv = sd_to_max96714(sd);
>> + u64 sink_streams;
>> + int ret;
>> +
>> + if (!priv->enabled_source_streams)
>> + max96714_enable_tx_port(priv);
>> +
>> + ret = max96714_apply_patgen(priv, state);
>> + if (ret)
>> + goto err;
>> +
>> + if (!priv->pattern) {
>> + if (!priv->rxport.source.sd) {
>> + ret = -ENODEV;
>> + goto err;
>> + }
>> +
>> + sink_streams =
>> + v4l2_subdev_state_xlate_streams(state,
>> + MAX96714_PAD_SOURCE,
>> + MAX96714_PAD_SINK,
>> + &streams_mask);
>> +
>> + ret = v4l2_subdev_enable_streams(priv->rxport.source.sd,
>> + priv->rxport.source.pad,
>> + sink_streams);
>> + if (ret)
>> + goto err;
>> + }
>> +
>> + priv->enabled_source_streams |= streams_mask;
>> +
>> + return 0;
>> +
>> +err:
>> + if (!priv->enabled_source_streams)
>> + max96714_disable_tx_port(priv);
>> +
>> + return ret;
>> +}
>> +
>> +static int max96714_disable_streams(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_state *state,
>> + u32 source_pad, u64 streams_mask)
>> +{
>> + struct max96714_priv *priv = sd_to_max96714(sd);
>> + u64 sink_streams;
>> + int ret;
>> +
>> + if (!priv->pattern && priv->rxport.source.sd) {
>> + sink_streams =
>> + v4l2_subdev_state_xlate_streams(state,
>> + MAX96714_PAD_SOURCE,
>> + MAX96714_PAD_SINK,
>> + &streams_mask);
>> +
>> + ret = v4l2_subdev_disable_streams(priv->rxport.source.sd,
>> + priv->rxport.source.pad,
>> + sink_streams);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> + priv->enabled_source_streams &= ~streams_mask;
>> +
>> + if (!priv->enabled_source_streams)
>> + max96714_disable_tx_port(priv);
>> +
>> + return 0;
>> +}
>> +
>> +static int max96714_s_stream(struct v4l2_subdev *subdev, int enable)
>> +{
>> + int ret;
>> + u64 streams_mask = BIT(0);
>> +
>> + if (enable)
>> + ret = v4l2_subdev_enable_streams(subdev, MAX96714_PAD_SOURCE,
>> + streams_mask);
>> + else
>> + ret = v4l2_subdev_disable_streams(subdev, MAX96714_PAD_SOURCE,
>> + streams_mask);
>> + return ret;
>> +}
>> +
>> +static int max96714_set_fmt(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_state *state,
>> + struct v4l2_subdev_format *format)
>> +{
>> + struct max96714_priv *priv = sd_to_max96714(sd);
>> + struct v4l2_mbus_framefmt *fmt;
>> +
>> + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
>> + priv->enabled_source_streams)
>> + return -EBUSY;
>> +
>> + /* No transcoding, source and sink formats must match. */
>> + if (format->pad == MAX96714_PAD_SOURCE)
>> + return v4l2_subdev_get_fmt(sd, state, format);
>> +
>> + fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream);
>> + if (!fmt)
>> + return -EINVAL;
>> +
>> + *fmt = format->format;
>> +
>> + fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad,
>> + format->stream);
>> + if (!fmt)
>> + return -EINVAL;
>> +
>> + *fmt = format->format;
>> +
>> + return 0;
>> +}
>> +
>> +static int _max96714_set_routing(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_state *state,
>> + enum v4l2_subdev_format_whence which,
>> + struct v4l2_subdev_krouting *routing)
>> +{
>> + int ret;
>
> Please declare ret as last.
Ok
>
>> +
>
> Extra newline.
Ok
>
>> + static const struct v4l2_mbus_framefmt format = {
>> + .width = 1280,
>> + .height = 1080,
>> + .code = MEDIA_BUS_FMT_Y8_1X8,
>> + .field = V4L2_FIELD_NONE,
>> + };
>> +
>> + /*
>> + * Note: we can only support up to V4L2_FRAME_DESC_ENTRY_MAX, until
>> + * frame desc is made dynamically allocated.
>> + */
>> + if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX)
>> + return -EINVAL;
>> +
>> + ret = v4l2_subdev_routing_validate(sd, routing,
>> + V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
>> + if (ret)
>> + return ret;
>> +
>> + ret = v4l2_subdev_set_routing_with_fmt(sd, state, routing, &format);
>
> return ...;
Ok
>
>> + if (ret)
>> + return ret;
>> +
>> + return 0;
>> +}
>> +
>> +static int max96714_set_routing(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_state *state,
>> + enum v4l2_subdev_format_whence which,
>> + struct v4l2_subdev_krouting *routing)
>> +{
>> + struct max96714_priv *priv = sd_to_max96714(sd);
>> +
>> + if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams)
>> + return -EBUSY;
>> +
>> + return _max96714_set_routing(sd, state, which, routing);
>> +}
>> +
>> +static int max96714_init_state(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_state *state)
>> +{
>> + struct v4l2_subdev_route routes[] = {
>> + {
>> + .sink_pad = MAX96714_PAD_SINK,
>> + .sink_stream = 0,
>> + .source_pad = MAX96714_PAD_SOURCE,
>> + .source_stream = 0,
>> + .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
>> + }
>> + };
>> +
>
> Extra newline.
Ok
>
>> + struct v4l2_subdev_krouting routing = {
>> + .num_routes = ARRAY_SIZE(routes),
>> + .routes = routes,
>> + };
>> +
>> + return _max96714_set_routing(sd, state, V4L2_SUBDEV_FORMAT_ACTIVE,
>> + &routing);
>> +}
>> +
>> +static const struct v4l2_subdev_pad_ops max96714_pad_ops = {
>> + .enable_streams = max96714_enable_streams,
>> + .disable_streams = max96714_disable_streams,
>> +
>> + .set_routing = max96714_set_routing,
>> + .get_fmt = v4l2_subdev_get_fmt,
>> + .set_fmt = max96714_set_fmt,
>> +};
>> +
>> +static bool max96714_link_locked(struct max96714_priv *priv)
>> +{
>> + u64 val = 0;
>> +
>> + cci_read(priv->regmap, MAX96714_LINK_LOCK, &val, NULL);
>> +
>> + return val & MAX96714_LINK_LOCK_BIT;
>> +}
>> +
>> +static void max96714_link_status(struct max96714_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> +
>> + dev_info(dev, "Link locked:%d\n", max96714_link_locked(priv));
>> +}
>> +
>> +static bool max96714_pipe_locked(struct max96714_priv *priv)
>> +{
>> + u64 val;
>> +
>> + cci_read(priv->regmap, MAX96714_VIDEO_RX8, &val, NULL);
>> +
>> + return val & MAX96714_VID_LOCK;
>> +}
>> +
>> +static void max96714_pipe_status(struct max96714_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> +
>> + dev_info(dev, "Pipe vidlock:%d\n", max96714_pipe_locked(priv));
>> +}
>> +
>> +static void max96714_csi_status(struct max96714_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + u64 freq = 0;
>> +
>> + cci_read(priv->regmap, MAX96714_BACKTOP25, &freq, NULL);
>> + freq = FIELD_GET(CSI_DPLL_FREQ_MASK, freq);
>> +
>> + dev_info(dev, "CSI controller DPLL freq:%u00MHz CSIPHY enabled:%d\n",
>> + (u8)freq, max96714_tx_port_enabled(priv));
>> +}
>> +
>> +static int max96714_log_status(struct v4l2_subdev *sd)
>> +{
>> + struct max96714_priv *priv = sd_to_max96714(sd);
>> + struct device *dev = &priv->client->dev;
>> +
>> + dev_info(dev, "Deserializer: max96714\n");
>> +
>> + max96714_link_status(priv);
>> + max96714_pipe_status(priv);
>> + max96714_csi_status(priv);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct v4l2_subdev_core_ops max96714_subdev_core_ops = {
>> + .log_status = max96714_log_status,
>> +};
>> +
>> +static const struct v4l2_subdev_video_ops max96714_video_ops = {
>> + .s_stream = max96714_s_stream,
Patch v4 will use v4l2_subdev_s_stream_helper instead of reimplementing
the function here.
>> +};
>> +
>> +static const struct v4l2_subdev_internal_ops max96714_internal_ops = {
>> + .init_state = max96714_init_state,
>> +};
>> +
>> +static const struct v4l2_subdev_ops max96714_subdev_ops = {
>> + .video = &max96714_video_ops,
>> + .core = &max96714_subdev_core_ops,
>> + .pad = &max96714_pad_ops,
>> +};
>> +
>> +static const struct media_entity_operations max96714_entity_ops = {
>> + .link_validate = v4l2_subdev_link_validate,
>> +};
>> +
>> +static int max96714_notify_bound(struct v4l2_async_notifier *notifier,
>> + struct v4l2_subdev *subdev,
>> + struct v4l2_async_connection *asd)
>> +{
>> + struct max96714_priv *priv = sd_to_max96714(notifier->sd);
>> + struct device *dev = &priv->client->dev;
>> + int ret;
>> +
>> + ret = media_entity_get_fwnode_pad(&subdev->entity,
>> + priv->rxport.source.ep_fwnode,
>> + MEDIA_PAD_FL_SOURCE);
>> + if (ret < 0) {
>> + dev_err(dev, "Failed to find pad for %s\n", subdev->name);
>> + return ret;
>> + }
>> +
>> + priv->rxport.source.sd = subdev;
>> + priv->rxport.source.pad = ret;
>> +
>> + ret = media_create_pad_link(&priv->rxport.source.sd->entity,
>> + priv->rxport.source.pad, &priv->sd.entity,
>> + MAX96714_PAD_SINK,
>> + MEDIA_LNK_FL_ENABLED |
>> + MEDIA_LNK_FL_IMMUTABLE);
>> + if (ret) {
>> + dev_err(dev, "Unable to link %s:%u -> %s:%u\n",
>> + priv->rxport.source.sd->name, priv->rxport.source.pad,
>> + priv->sd.name, MAX96714_PAD_SINK);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const struct v4l2_async_notifier_operations max96714_notify_ops = {
>> + .bound = max96714_notify_bound,
>> +};
>> +
>> +static int max96714_v4l2_notifier_register(struct max96714_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + struct max96714_rxport *rxport = &priv->rxport;
>> + struct v4l2_async_connection *asd;
>> + int ret;
>> +
>> + if (!rxport->source.ep_fwnode)
>> + return 0;
>> +
>> + v4l2_async_subdev_nf_init(&priv->notifier, &priv->sd);
>> +
>> + asd = v4l2_async_nf_add_fwnode(&priv->notifier,
>> + rxport->source.ep_fwnode,
>> + struct v4l2_async_connection);
>> + if (IS_ERR(asd)) {
>> + dev_err(dev, "Failed to add subdev: %pe", asd);
>> + v4l2_async_nf_cleanup(&priv->notifier);
>> + return PTR_ERR(asd);
>> + }
>> +
>> + priv->notifier.ops = &max96714_notify_ops;
>> +
>> + ret = v4l2_async_nf_register(&priv->notifier);
>> + if (ret) {
>> + dev_err(dev, "Failed to register subdev_notifier");
>> + v4l2_async_nf_cleanup(&priv->notifier);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void max96714_v4l2_notifier_unregister(struct max96714_priv *priv)
>> +{
>> + v4l2_async_nf_unregister(&priv->notifier);
>> + v4l2_async_nf_cleanup(&priv->notifier);
>> +}
>> +
>> +static int max96714_create_subdev(struct max96714_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + int ret;
>> +
>> + v4l2_i2c_subdev_init(&priv->sd, priv->client, &max96714_subdev_ops);
>> + priv->sd.internal_ops = &max96714_internal_ops;
>> +
>> + v4l2_ctrl_handler_init(&priv->ctrl_handler, 1);
>> + priv->sd.ctrl_handler = &priv->ctrl_handler;
>> +
>> + priv->tx_link_freq = priv->vep.link_frequencies[0];
>> + if (priv->tx_link_freq < 0)
>> + return priv->tx_link_freq;
>> +
>> + v4l2_ctrl_new_int_menu(&priv->ctrl_handler, NULL, V4L2_CID_LINK_FREQ,
>> + 0, 0, &priv->tx_link_freq);
>> + if (priv->ctrl_handler.error) {
>> + ret = priv->ctrl_handler.error;
>> + goto err_free_ctrl;
>> + }
>> +
>> + v4l2_ctrl_new_std_menu_items(&priv->ctrl_handler,
>> + &max96714_ctrl_ops,
>> + V4L2_CID_TEST_PATTERN,
>> + ARRAY_SIZE(max96714_test_pattern) - 1,
>> + 0, 0, max96714_test_pattern);
>> + if (priv->ctrl_handler.error) {
>> + ret = priv->ctrl_handler.error;
>> + goto err_free_ctrl;
>> + }
>> +
>> + priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
>> + priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
>> + priv->sd.entity.ops = &max96714_entity_ops;
>> +
>> + priv->pads[MAX96714_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
>> + priv->pads[MAX96714_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
>> +
>> + ret = media_entity_pads_init(&priv->sd.entity,
>> + MAX96714_NPORTS,
>> + priv->pads);
>> + if (ret)
>> + goto err_free_ctrl;
>> +
>> + priv->sd.state_lock = priv->sd.ctrl_handler->lock;
>> +
>> + ret = v4l2_subdev_init_finalize(&priv->sd);
>> + if (ret)
>> + goto err_entity_cleanup;
>> +
>> + ret = max96714_v4l2_notifier_register(priv);
>> + if (ret) {
>> + dev_err(dev, "v4l2 subdev notifier register failed: %d\n", ret);
>> + goto err_subdev_cleanup;
>> + }
>> +
>> + ret = v4l2_async_register_subdev(&priv->sd);
>> + if (ret) {
>> + dev_err(dev, "v4l2_async_register_subdev error: %d\n", ret);
>> + goto err_unreg_notif;
>> + }
>> +
>> + return 0;
>> +
>> +err_unreg_notif:
>> + max96714_v4l2_notifier_unregister(priv);
>> +err_subdev_cleanup:
>> + v4l2_subdev_cleanup(&priv->sd);
>> +err_entity_cleanup:
>> + media_entity_cleanup(&priv->sd.entity);
>> +err_free_ctrl:
>> + v4l2_ctrl_handler_free(&priv->ctrl_handler);
>> +
>> + return ret;
>> +};
>> +
>> +static void max96714_destroy_subdev(struct max96714_priv *priv)
>> +{
>> + max96714_v4l2_notifier_unregister(priv);
>> + v4l2_async_unregister_subdev(&priv->sd);
>> +
>> + v4l2_subdev_cleanup(&priv->sd);
>> +
>> + media_entity_cleanup(&priv->sd.entity);
>> + v4l2_ctrl_handler_free(&priv->ctrl_handler);
>> +}
>> +
>> +static int max96714_i2c_mux_select(struct i2c_mux_core *mux, u32 chan)
>> +{
>> + return 0;
>> +}
>> +
>> +static int max96714_i2c_mux_init(struct max96714_priv *priv)
>> +{
>> + priv->mux = i2c_mux_alloc(priv->client->adapter, &priv->client->dev,
>> + 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
>> + max96714_i2c_mux_select, NULL);
>> + if (!priv->mux)
>> + return -ENOMEM;
>> +
>> + return i2c_mux_add_adapter(priv->mux, 0, 0, 0);
>> +}
>> +
>> +static int max96714_init_tx_port(struct max96714_priv *priv)
>> +{
>> + struct v4l2_mbus_config_mipi_csi2 *mipi;
>> + unsigned long lanes_used = 0;
>> + u8 val, lane;
>> + int ret;
>> +
>> + ret = max96714_disable_tx_port(priv);
>> +
>> + mipi = &priv->vep.bus.mipi_csi2;
>> + val = *priv->vep.link_frequencies * 2 / MHZ(100);
>> +
>> + cci_update_bits(priv->regmap, MAX96714_BACKTOP25,
>> + CSI_DPLL_FREQ_MASK, val, &ret);
>> +
>> + val = FIELD_PREP(MAX96714_CSI2_LANE_CNT_MASK, mipi->num_data_lanes - 1);
>> + cci_update_bits(priv->regmap, MAX96714_MIPI_LANE_CNT,
>> + MAX96714_CSI2_LANE_CNT_MASK, val, &ret);
>> +
>> + /* lanes polarity */
>> + val = 0;
>> + for (lane = 0; lane < mipi->num_data_lanes + 1; lane++) {
>> + if (!mipi->lane_polarities[lane])
>> + continue;
>> + if (lane == 0)
>> + /* clock lane */
>> + val |= BIT(5);
>> + else if (lane < 3)
>> + /* Lane D0 and D1 */
>> + val |= BIT(lane - 1);
>> + else
>> + /* D2 and D3 */
>> + val |= BIT(lane);
>> + }
>> +
>> + cci_update_bits(priv->regmap, MAX96714_MIPI_POLARITY,
>> + MAX96714_MIPI_POLARITY_MASK, val, &ret);
>> +
>> + /* lanes mapping */
>> + val = 0;
>> + for (lane = 0; lane < mipi->num_data_lanes; lane++) {
>> + val |= (mipi->data_lanes[lane] - 1) << (lane * 2);
>> + lanes_used |= BIT(mipi->data_lanes[lane] - 1);
>> + }
>> +
>> + /* Unused lanes need to be mapped as well to not have
>> + * the same lanes mapped twice.
>> + */
>> + for (; lane < 4; lane++) {
>> + unsigned int idx = find_first_zero_bit(&lanes_used, 4);
>> +
>> + val |= idx << (lane * 2);
>> + lanes_used |= BIT(idx);
>> + }
>> +
>> + return cci_write(priv->regmap, MAX96714_MIPI_LANE_MAP, val, &ret);
>> +}
>> +
>> +static int max96714_rxport_enable_poc(struct max96714_priv *priv)
>> +{
>> + struct max96714_rxport *rxport = &priv->rxport;
>> +
>> + if (!rxport->poc)
>> + return 0;
>> +
>> + return regulator_enable(rxport->poc);
>> +}
>> +
>> +static int max96714_rxport_disable_poc(struct max96714_priv *priv)
>> +{
>> + struct max96714_rxport *rxport = &priv->rxport;
>> +
>> + if (!rxport->poc)
>> + return 0;
>> +
>> + return regulator_disable(rxport->poc);
>> +}
>> +
>> +static int max96714_parse_dt_txport(struct max96714_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + struct fwnode_handle *ep_fwnode;
>> + u32 num_data_lanes;
>> + s64 dpll_freq;
>> + int ret;
>> +
>> + ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
>> + MAX96714_PAD_SOURCE, 0, 0);
>> + if (!ep_fwnode)
>> + return -EINVAL;
>> +
>> + priv->vep.bus_type = V4L2_MBUS_UNKNOWN;
>> +
>> + ret = v4l2_fwnode_endpoint_alloc_parse(ep_fwnode, &priv->vep);
>> + fwnode_handle_put(ep_fwnode);
>> + if (ret) {
>> + dev_err(dev, "tx: failed to parse endpoint data\n");
>> + return -EINVAL;
>> + }
>> +
>> + if (priv->vep.bus_type != V4L2_MBUS_CSI2_DPHY) {
>> + dev_err(&priv->client->dev, "Unsupported bus-type %u\n",
>> + priv->vep.bus_type);
>> + return -EINVAL;
>> + }
>> +
>> + if (priv->vep.nr_of_link_frequencies != 1) {
>> + ret = -EINVAL;
>> + goto err_free_vep;
>> + }
>> +
>> + /* DPLL freq is twice the link frequency */
>> + dpll_freq = priv->vep.link_frequencies[0] * 2;
>> +
>> + /* 100Mbps step, Min 100Mbps, Max 2500Mbps */
>> + if (dpll_freq % MHZ(100) || dpll_freq < MHZ(100) ||
>> + dpll_freq > MHZ(2500)) {
>> + dev_err(dev, "tx: invalid link frequency\n");
>> + ret = -EINVAL;
>> + goto err_free_vep;
>> + }
>> +
>> + num_data_lanes = priv->vep.bus.mipi_csi2.num_data_lanes;
>> + if (num_data_lanes < 1 || num_data_lanes > 4) {
>> + dev_err(dev,
>> + "tx: invalid number of data lanes should be 1 to 4\n");
>> + ret = -EINVAL;
>> + goto err_free_vep;
>> + }
>> +
>> + return 0;
>> +
>> +err_free_vep:
>> + v4l2_fwnode_endpoint_free(&priv->vep);
>> +
>> + return ret;
>> +};
>> +
>> +static int max96714_parse_dt_rxport(struct max96714_priv *priv)
>> +{
>> + static const char *poc_name = "port0-poc";
>> + struct max96714_rxport *rxport = &priv->rxport;
>> + struct device *dev = &priv->client->dev;
>> + struct fwnode_handle *ep_fwnode;
>> + int ret;
>> +
>> + ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
>> + MAX96714_PAD_SINK,
>> + 0, 0);
>
> Fits on the previous line.
ok
>
>> + if (!ep_fwnode)
>> + return -ENOENT;
>> +
>> + rxport->source.ep_fwnode = fwnode_graph_get_remote_endpoint(ep_fwnode);
>> + fwnode_handle_put(ep_fwnode);
>> +
>> + if (!rxport->source.ep_fwnode) {
>> + dev_err(dev, "rx: no remote endpoint\n");
>> + return -EINVAL;
>> + }
>> +
>> + rxport->poc = devm_regulator_get_optional(dev, poc_name);
>> + if (IS_ERR(rxport->poc)) {
>> + ret = PTR_ERR(rxport->poc);
>> + if (ret == -ENODEV) {
>> + rxport->poc = NULL;
>> + } else {
>> + dev_err(dev, "rx: failed to get POC supply: %d\n", ret);
>> + goto err_put_source_ep_fwnode;
>> + }
>> + }
>> +
>> + return 0;
>> +
>> +err_put_source_ep_fwnode:
>> + fwnode_handle_put(rxport->source.ep_fwnode);
>> + return ret;
>> +}
>> +
>> +static int max96714_parse_dt(struct max96714_priv *priv)
>> +{
>> + int ret;
>> +
>> + ret = max96714_parse_dt_rxport(priv);
>> + /* The deserializer can create a test pattern even if the
>> + * rx port is not connected to a serializer.
>> + */
>> + if (ret && ret != -ENOENT)
>> + return ret;
>> +
>> + ret = max96714_parse_dt_txport(priv);
>> + if (ret)
>> + goto err_put_fwnode;
>> +
>> + return 0;
>> +
>> +err_put_fwnode:
>> + fwnode_handle_put(priv->rxport.source.ep_fwnode);
>
> This is already done in max96714_parse_dt_txport().
ok
>
>> +
>> + return ret;
>> +}
>> +
>> +static int max96714_enable_core_hw(struct max96714_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + u64 val;
>> + int ret;
>> +
>> + if (priv->pd_gpio) {
>> + /* wait min 2 ms for reset to complete */
>> + gpiod_set_value_cansleep(priv->pd_gpio, 1);
>> + fsleep(2000);
>> + gpiod_set_value_cansleep(priv->pd_gpio, 0);
>> + /* wait min 2 ms for power up to finish */
>> + fsleep(2000);
>> + }
>> +
>> + ret = cci_read(priv->regmap, MAX96714_REG13, &val, NULL);
>> + if (ret) {
>> + dev_err_probe(dev, ret, "Cannot read first register, abort\n");
>> + goto err_pd_gpio;
>> + }
>> +
>> + if (val != MAX96714F_DEVICE_ID) {
>> + dev_err(dev, "Unsupported device id expected %x got %x\n",
>> + MAX96714F_DEVICE_ID, (u8)val);
>> + ret = -EOPNOTSUPP;
>> + goto err_pd_gpio;
>> + }
>> +
>> + ret = cci_read(priv->regmap, MAX96714_DEV_REV, &val, NULL);
>> + if (ret)
>> + goto err_pd_gpio;
>> +
>> + dev_dbg(dev, "Found %x (rev %lx)\n", MAX96714F_DEVICE_ID,
>> + (u8)val & MAX96714_DEV_REV_MASK);
>> +
>> + ret = cci_read(priv->regmap, MAX96714_MIPI_TX52, &val, NULL);
>> + if (ret)
>> + goto err_pd_gpio;
>> +
>> + if (!(val & MAX96714_TUN_EN)) {
>> + dev_err(dev, "Only supporting tunnel mode");
>> + ret = -EOPNOTSUPP;
>> + goto err_pd_gpio;
>> + }
>> +
>> + return 0;
>> +
>> +err_pd_gpio:
>> + gpiod_set_value_cansleep(priv->pd_gpio, 1);
>> + return ret;
>> +}
>> +
>> +static void max96714_disable_core_hw(struct max96714_priv *priv)
>> +{
>> + gpiod_set_value_cansleep(priv->pd_gpio, 1);
>> +}
>> +
>> +static int max96714_get_hw_resources(struct max96714_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> +
>> + priv->regmap = devm_cci_regmap_init_i2c(priv->client, 16);
>> + if (IS_ERR(priv->regmap))
>> + return PTR_ERR(priv->regmap);
>> +
>> + priv->pd_gpio =
>> + devm_gpiod_get_optional(dev, "powerdown", GPIOD_OUT_HIGH);
>> + if (IS_ERR(priv->pd_gpio))
>> + return dev_err_probe(dev, PTR_ERR(priv->pd_gpio),
>> + "Cannot get powerdown GPIO\n");
>> + return 0;
>> +}
>> +
>> +static int max96714_probe(struct i2c_client *client)
>> +{
>> + struct device *dev = &client->dev;
>> + struct max96714_priv *priv;
>> + int ret;
>> +
>> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>> + if (!priv)
>> + return -ENOMEM;
>> +
>> + priv->client = client;
>> + priv->regmap = devm_regmap_init_i2c(priv->client,
>> + &max96714_regmap_config);
regmap is intialized twice, here and in max96714_get_hw_resources,
I will keep the one in get_hw_resources only for the v4.
>> +
>> + ret = max96714_get_hw_resources(priv);
>> + if (ret)
>> + return ret;
>> +
>> + ret = max96714_enable_core_hw(priv);
>> + if (ret)
>> + return ret;
>> +
>> + ret = max96714_parse_dt(priv);
>> + if (ret)
>> + goto err_disable_core_hw;
>> +
>> + max96714_init_tx_port(priv);
>> +
>> + ret = max96714_rxport_enable_poc(priv);
>> + if (ret)
>> + goto err_free_ports;
>> +
>> + ret = max96714_i2c_mux_init(priv);
>> + if (ret)
>> + goto err_disable_poc;
>> +
>> + ret = max96714_create_subdev(priv);
>> + if (ret)
>> + goto err_del_mux;
>> +
>> + return 0;
>> +
>> +err_del_mux:
>> + i2c_mux_del_adapters(priv->mux);
>> +err_disable_poc:
>> + max96714_rxport_disable_poc(priv);
>> +err_free_ports:
>> + fwnode_handle_put(priv->rxport.source.ep_fwnode);
>> + v4l2_fwnode_endpoint_free(&priv->vep);
>> +err_disable_core_hw:
>> + max96714_disable_core_hw(priv);
>> +
>> + return ret;
>> +}
>> +
>> +static void max96714_remove(struct i2c_client *client)
>> +{
>> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
>> + struct max96714_priv *priv = sd_to_max96714(sd);
>> +
>> + max96714_destroy_subdev(priv);
>> + i2c_mux_del_adapters(priv->mux);
>> + max96714_rxport_disable_poc(priv);
>> + fwnode_handle_put(priv->rxport.source.ep_fwnode);
>> + v4l2_fwnode_endpoint_free(&priv->vep);
>> + max96714_disable_core_hw(priv);
>> + gpiod_set_value_cansleep(priv->pd_gpio, 1);
>> +}
>> +
>> +static const struct of_device_id max96714_of_ids[] = {
>> + { .compatible = "maxim,max96714f" },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(of, max96714_of_ids);
>> +
>> +static struct i2c_driver max96714_i2c_driver = {
>> + .driver = {
>> + .name = "max96714",
>> + .of_match_table = max96714_of_ids,
>> + },
>> + .probe = max96714_probe,
>> + .remove = max96714_remove,
>> +};
>> +
>> +module_i2c_driver(max96714_i2c_driver);
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_DESCRIPTION("Maxim Integrated GMSL2 Deserializers Driver");
>> +MODULE_AUTHOR("Julien Massot <julien.massot@...labora.com>");
>
Regards,
--
Julien Massot
Senior Software Engineer
Collabora Ltd.
Platinum Building, St John's Innovation Park, Cambridge CB4 0DS, UK
Registered in England & Wales, no. 5513718
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