Hi Sakari,
Thank you for taking the time to review this, it certainly helps get
this code progressing once again.
On 21/02/2020 07:59, Sakari Ailus wrote:
> Hi Kieran,
>
> Thank you for the update. I have some comments below.
>
> On Fri, Feb 14, 2020 at 10:31:36AM +0000, Kieran Bingham wrote:
>> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and
>> CSI-2 output. The device supports multicamera streaming applications,
>> and features the ability to synchronise the attached cameras.
>>
>> CSI-2 output can be configured with 1 to 4 lanes, and a control channel
>> is supported over I2C, which implements an I2C mux to facilitate
>> communications with connected cameras across the reverse control
>> channel.
>
> Do you happen to have an example of a sensor driver that would work with
> this driver?
We are currently using the RDACM20, and we are in progress for sharing
this code across with the RDACM21 (which is why they haven't been posted
yet).
Both the RDACM20/21 use a max9271 serialiser, but different sensor
configurations, so Jacopo is working to create a means to allow the
max9271 serialiser to be common.
I believe that will be posted sometime soon from Jacopo when he's got
RDACM21 working happily.
I'm also aware of an AR0231 based camera which Linaro have been working
on based on some of the framework of this driver, so I would expect that
to later be supported also.
I'll work through your comments below, and aim towards a v8 (I've got a
few other changes to come in too)
I'll see if I can synchronise with Jacopo to post a sensor driver with
the next version.
>> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
>> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
>>
>> --
>> v2:
>> - Fix MAINTAINERS entry
>>
>> This posting is released with the following modifications to work
>> without Sakari's VC developments:
>> - max9286_g_mbus_config() re-instated
>> - max9286_get_frame_desc() is not bus/csi aware
>> - max9286_{get,set}_routing() removed
>>
>> v3:
>> - Initialise notifier with v4l2_async_notifier_init
>> - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY
>>
>> v4: - Re-introduce required code to function with the VC series.
>>
>> - Implement max9286_get_routing, max9286_set_routing
>> - Remove max9286_g_mbus_config
>
> I understand there is no dependency to the VC patchset.
>
> How does the receiver figure out what it should receive? Do you assume a
> particular receiver driver, for example?
>
>>
>> v5: (internal release)
>> - Fix printk formatting for hex value
>> - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |)
>> - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE
>> - Remove 'device is bound' workaround
>>
>> v6:
>> - v4l2_subdev_krouting instead of v4l2_subdev_routing separated
>> to allow integration without the VC/V4L2-Mux series.
>> - convert sd_to_max9286 to inline function
>> - rename max9286_device to max9286_priv
>> - Cleanup the v4l2_async_notifier
>> - Extend MODULE_AUTHOR
>> - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id
>> - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam)
>> - Use new YAML file reference in MAINTAINERS
>> - Parse new i2c-mux node in max9286_get_i2c_by_id
>> (This could/should be refactored to parse these separately first)
>> - Spelling and calculation fixes in the FSYNC_LOCKED check comments
>> - Identify each enabled i2c-mux channel in a single pass
>> - max9286: Improve mux-state readbility [v2]
>> - Fix frame sync lock durations
>> - Add comment to describe /why/ we must open the mux in s_stream
>> - use -EXDEV as return code for failed link synchronisation.
>> - Fix reference counting of the dt nodeS
>> - Convert to probe_new for I2C
>> - Remove redundant max9286_i2c_mux_state
>> - Provide optional enable-gpio (max9286-pwdn)
>>
>> v7:
>> [Kieran]
>> - Ensure powerdown lines are optional
>> - Add a 4ms power-up delay
>> - Add max9286_check_config_link() to core
>> - Add GPIO chip controller for GPIO0OUT and GPIO1OUT
>> - Fix GPIO registration
>> - max9286: Split out async registration
>> (fixes regulator -EPROBE_DEFERs failures)
>> - Collect all V4L2 registrations
>> - balance v4l2_async refcnting
>> - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_
>>
>> [Jacopo]
>> - Remove redundanct MAXIM_I2C_SPEED macros
>> - Move notifiers operations
>> - Add delay after reverse channel reconfiguration
>> - Move link setup to completion
>> - Fix up max9286_check_config_link() implementation
>> - Remove redundant dual configuration of reverse channel
>>
>> MAINTAINERS | 10 +
>> drivers/media/i2c/Kconfig | 11 +
>> drivers/media/i2c/Makefile | 1 +
>> drivers/media/i2c/max9286.c | 1278 +++++++++++++++++++++++++++++++++++
>> 4 files changed, 1300 insertions(+)
>> create mode 100644 drivers/media/i2c/max9286.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 983d3c97edd1..148706353d25 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -10033,6 +10033,16 @@ F: Documentation/devicetree/bindings/hwmon/max6697.txt
>> F: drivers/hwmon/max6697.c
>> F: include/linux/platform_data/max6697.h
>>
>> +MAX9286 QUAD GMSL DESERIALIZER DRIVER
>> +M: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
>> +M: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
>> +M: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
>> +M: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
>> +L: linux-media@xxxxxxxxxxxxxxx
>> +S: Maintained
>> +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
>> +F: drivers/media/i2c/max9286.c
>> +
>> MAX9860 MONO AUDIO VOICE CODEC DRIVER
>> M: Peter Rosin <peda@xxxxxxxxxx>
>> L: alsa-devel@xxxxxxxxxxxxxxxx (moderated for non-subscribers)
>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
>> index c68e002d26ea..32a4deb90617 100644
>> --- a/drivers/media/i2c/Kconfig
>> +++ b/drivers/media/i2c/Kconfig
>> @@ -442,6 +442,17 @@ config VIDEO_VPX3220
>> To compile this driver as a module, choose M here: the
>> module will be called vpx3220.
>>
>> +config VIDEO_MAX9286
>> + tristate "Maxim MAX9286 GMSL deserializer support"
>> + depends on I2C && I2C_MUX
>> + depends on VIDEO_V4L2_SUBDEV_API && MEDIA_CONTROLLER
>> + select V4L2_FWNODE
>> + help
>> + This driver supports the Maxim MAX9286 GMSL deserializer.
>> +
>> + To compile this driver as a module, choose M here: the
>> + module will be called max9286.
>> +
>> comment "Video and audio decoders"
>>
>> config VIDEO_SAA717X
>> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
>> index c147bb9d28db..8896cf8bfc4f 100644
>> --- a/drivers/media/i2c/Makefile
>> +++ b/drivers/media/i2c/Makefile
>> @@ -117,5 +117,6 @@ obj-$(CONFIG_VIDEO_IMX290) += imx290.o
>> obj-$(CONFIG_VIDEO_IMX319) += imx319.o
>> obj-$(CONFIG_VIDEO_IMX355) += imx355.o
>> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
>> +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o
>>
>> obj-$(CONFIG_SDR_MAX2175) += max2175.o
>> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
>> new file mode 100644
>> index 000000000000..a20829297ef6
>> --- /dev/null
>> +++ b/drivers/media/i2c/max9286.c
>> @@ -0,0 +1,1278 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Maxim MAX9286 GMSL Deserializer Driver
>> + *
>> + * Copyright (C) 2017-2019 Jacopo Mondi
>> + * Copyright (C) 2017-2019 Kieran Bingham
>> + * Copyright (C) 2017-2019 Laurent Pinchart
>> + * Copyright (C) 2017-2019 Niklas Söderlund
>> + * Copyright (C) 2016 Renesas Electronics Corporation
>> + * Copyright (C) 2015 Cogent Embedded, Inc.
>> + */
>> +
>> +#include <linux/delay.h>
>> +#include <linux/device.h>
>> +#include <linux/fwnode.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/gpio/driver.h>
>> +#include <linux/i2c.h>
>> +#include <linux/i2c-mux.h>
>> +#include <linux/module.h>
>> +#include <linux/of_graph.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/slab.h>
>> +
>> +#include <media/v4l2-async.h>
>> +#include <media/v4l2-ctrls.h>
>> +#include <media/v4l2-device.h>
>> +#include <media/v4l2-fwnode.h>
>> +#include <media/v4l2-subdev.h>
>> +
>> +/* Register 0x00 */
>> +#define MAX9286_MSTLINKSEL_AUTO (7 << 5)
>> +#define MAX9286_MSTLINKSEL(n) ((n) << 5)
>> +#define MAX9286_EN_VS_GEN BIT(4)
>> +#define MAX9286_LINKEN(n) (1 << (n))
>> +/* Register 0x01 */
>> +#define MAX9286_FSYNCMODE_ECU (3 << 6)
>> +#define MAX9286_FSYNCMODE_EXT (2 << 6)
>> +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6)
>> +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6)
>> +#define MAX9286_GPIEN BIT(5)
>> +#define MAX9286_ENLMO_RSTFSYNC BIT(2)
>> +#define MAX9286_FSYNCMETH_AUTO (2 << 0)
>> +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0)
>> +#define MAX9286_FSYNCMETH_MANUAL (0 << 0)
>> +#define MAX9286_REG_FSYNC_PERIOD_L 0x06
>> +#define MAX9286_REG_FSYNC_PERIOD_M 0x07
>> +#define MAX9286_REG_FSYNC_PERIOD_H 0x08
>> +/* Register 0x0a */
>> +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4))
>> +#define MAX9286_REVCCEN(n) (1 << (n))
>> +/* Register 0x0c */
>> +#define MAX9286_HVEN BIT(7)
>> +#define MAX9286_EDC_6BIT_HAMMING (2 << 5)
>> +#define MAX9286_EDC_6BIT_CRC (1 << 5)
>> +#define MAX9286_EDC_1BIT_PARITY (0 << 5)
>> +#define MAX9286_DESEL BIT(4)
>> +#define MAX9286_INVVS BIT(3)
>> +#define MAX9286_INVHS BIT(2)
>> +#define MAX9286_HVSRC_D0 (2 << 0)
>> +#define MAX9286_HVSRC_D14 (1 << 0)
>> +#define MAX9286_HVSRC_D18 (0 << 0)
>> +/* Register 0x0f */
>> +#define MAX9286_0X0F_RESERVED BIT(3)
>> +/* Register 0x12 */
>> +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6)
>> +#define MAX9286_CSIDBL BIT(5)
>> +#define MAX9286_DBL BIT(4)
>> +#define MAX9286_DATATYPE_USER_8BIT (11 << 0)
>> +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0)
>> +#define MAX9286_DATATYPE_USER_24BIT (9 << 0)
>> +#define MAX9286_DATATYPE_RAW14 (8 << 0)
>> +#define MAX9286_DATATYPE_RAW11 (7 << 0)
>> +#define MAX9286_DATATYPE_RAW10 (6 << 0)
>> +#define MAX9286_DATATYPE_RAW8 (5 << 0)
>> +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0)
>> +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0)
>> +#define MAX9286_DATATYPE_RGB555 (2 << 0)
>> +#define MAX9286_DATATYPE_RGB565 (1 << 0)
>> +#define MAX9286_DATATYPE_RGB888 (0 << 0)
>> +/* Register 0x15 */
>> +#define MAX9286_VC(n) ((n) << 5)
>> +#define MAX9286_VCTYPE BIT(4)
>> +#define MAX9286_CSIOUTEN BIT(3)
>> +#define MAX9286_0X15_RESV (3 << 0)
>> +/* Register 0x1b */
>> +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4))
>> +#define MAX9286_ENEQ(n) (1 << (n))
>> +/* Register 0x27 */
>> +#define MAX9286_LOCKED BIT(7)
>> +/* Register 0x31 */
>> +#define MAX9286_FSYNC_LOCKED BIT(6)
>> +/* Register 0x34 */
>> +#define MAX9286_I2CLOCACK BIT(7)
>> +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5)
>> +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5)
>> +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5)
>> +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5)
>> +#define MAX9286_I2CMSTBT_837KBPS (7 << 2)
>> +#define MAX9286_I2CMSTBT_533KBPS (6 << 2)
>> +#define MAX9286_I2CMSTBT_339KBPS (5 << 2)
>> +#define MAX9286_I2CMSTBT_173KBPS (4 << 2)
>> +#define MAX9286_I2CMSTBT_105KBPS (3 << 2)
>> +#define MAX9286_I2CMSTBT_84KBPS (2 << 2)
>> +#define MAX9286_I2CMSTBT_28KBPS (1 << 2)
>> +#define MAX9286_I2CMSTBT_8KBPS (0 << 2)
>> +#define MAX9286_I2CSLVTO_NONE (3 << 0)
>> +#define MAX9286_I2CSLVTO_1024US (2 << 0)
>> +#define MAX9286_I2CSLVTO_256US (1 << 0)
>> +#define MAX9286_I2CSLVTO_64US (0 << 0)
>> +/* Register 0x3b */
>> +#define MAX9286_REV_TRF(n) ((n) << 4)
>> +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */
>> +#define MAX9286_REV_AMP_X BIT(0)
>> +/* Register 0x3f */
>> +#define MAX9286_EN_REV_CFG BIT(6)
>> +#define MAX9286_REV_FLEN(n) ((n) - 20)
>> +/* Register 0x49 */
>> +#define MAX9286_VIDEO_DETECT_MASK 0x0f
>> +/* Register 0x69 */
>> +#define MAX9286_LFLTBMONMASKED BIT(7)
>> +#define MAX9286_LOCKMONMASKED BIT(6)
>> +#define MAX9286_AUTOCOMBACKEN BIT(5)
>> +#define MAX9286_AUTOMASKEN BIT(4)
>> +#define MAX9286_MASKLINK(n) ((n) << 0)
>> +
>> +#define MAX9286_NUM_GMSL 4
>> +#define MAX9286_N_SINKS 4
>> +#define MAX9286_N_PADS 5
>> +#define MAX9286_SRC_PAD 4
>> +
>> +struct max9286_source {
>> + struct v4l2_async_subdev asd;
>> + struct v4l2_subdev *sd;
>> + struct fwnode_handle *fwnode;
>> +};
>> +
>> +#define asd_to_max9286_source(_asd) \
>> + container_of(_asd, struct max9286_source, asd)
>> +
>> +struct max9286_priv {
>> + struct i2c_client *client;
>> + struct gpio_desc *gpiod_pwdn;
>> + struct v4l2_subdev sd;
>> + struct media_pad pads[MAX9286_N_PADS];
>> + struct regulator *regulator;
>> + bool poc_enabled;
>> +
>> + struct gpio_chip gpio;
>> + u8 gpio_state;
>> +
>> + struct i2c_mux_core *mux;
>> + unsigned int mux_channel;
>> + bool mux_open;
>> +
>> + struct v4l2_ctrl_handler ctrls;
>> +
>> + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS];
>> +
>> + unsigned int nsources;
>> + unsigned int source_mask;
>> + unsigned int route_mask;
>> + unsigned int bound_sources;
>> + unsigned int csi2_data_lanes;
>> + struct max9286_source sources[MAX9286_NUM_GMSL];
>> + struct v4l2_async_notifier notifier;
>> +};
>> +
>> +static struct max9286_source *next_source(struct max9286_priv *priv,
>> + struct max9286_source *source)
>> +{
>> + if (!source)
>> + source = &priv->sources[0];
>> + else
>> + source++;
>> +
>> + for (; source < &priv->sources[MAX9286_NUM_GMSL]; source++) {
>> + if (source->fwnode)
>> + return source;
>> + }
>> +
>> + return NULL;
>> +}
>> +
>> +#define for_each_source(priv, source) \
>> + for ((source) = NULL; ((source) = next_source((priv), (source))); )
>> +
>> +#define to_index(priv, source) ((source) - &(priv)->sources[0])
>> +
>> +static inline struct max9286_priv *sd_to_max9286(struct v4l2_subdev *sd)
>> +{
>> + return container_of(sd, struct max9286_priv, sd);
>> +}
>> +
>> +/* -----------------------------------------------------------------------------
>> + * I2C IO
>> + */
>> +
>> +static int max9286_read(struct max9286_priv *priv, u8 reg)
>> +{
>> + int ret;
>> +
>> + ret = i2c_smbus_read_byte_data(priv->client, reg);
>> + if (ret < 0)
>> + dev_err(&priv->client->dev,
>> + "%s: register 0x%02x read failed (%d)\n",
>> + __func__, reg, ret);
>> +
>> + return ret;
>> +}
>> +
>> +static int max9286_write(struct max9286_priv *priv, u8 reg, u8 val)
>> +{
>> + int ret;
>> +
>> + ret = i2c_smbus_write_byte_data(priv->client, reg, val);
>> + if (ret < 0)
>> + dev_err(&priv->client->dev,
>> + "%s: register 0x%02x write failed (%d)\n",
>> + __func__, reg, ret);
>> +
>> + return ret;
>> +}
>> +
>> +/* -----------------------------------------------------------------------------
>> + * I2C Multiplexer
>> + */
>> +
>> +static void max9286_i2c_mux_configure(struct max9286_priv *priv, u8 conf)
>> +{
>> + max9286_write(priv, 0x0a, conf);
>> +
>> + /*
>> + * We must sleep after any change to the forward or reverse channel
>> + * configuration.
>> + */
>> + usleep_range(3000, 5000);
>> +}
>> +
>> +static void max9286_i2c_mux_open(struct max9286_priv *priv)
>> +{
>> + /* Open all channels on the MAX9286 */
>> + max9286_i2c_mux_configure(priv, 0xff);
>> +
>> + priv->mux_open = true;
>> +}
>> +
>> +static void max9286_i2c_mux_close(struct max9286_priv *priv)
>> +{
>> + /*
>> + * Ensure that both the forward and reverse channel are disabled on the
>> + * mux, and that the channel ID is invalidated to ensure we reconfigure
>> + * on the next max9286_i2c_mux_select() call.
>> + */
>> + max9286_i2c_mux_configure(priv, 0x00);
>> +
>> + priv->mux_open = false;
>> + priv->mux_channel = -1;
>> +}
>> +
>> +static int max9286_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan)
>> +{
>> + struct max9286_priv *priv = i2c_mux_priv(muxc);
>> +
>> + /* Channel select is disabled when configured in the opened state. */
>> + if (priv->mux_open)
>> + return 0;
>> +
>> + if (priv->mux_channel == chan)
>> + return 0;
>> +
>> + priv->mux_channel = chan;
>> +
>> + max9286_i2c_mux_configure(priv,
>> + MAX9286_FWDCCEN(chan) |
>> + MAX9286_REVCCEN(chan));
>> +
>> + return 0;
>> +}
>> +
>> +static int max9286_i2c_mux_init(struct max9286_priv *priv)
>> +{
>> + struct max9286_source *source;
>> + int ret;
>> +
>> + if (!i2c_check_functionality(priv->client->adapter,
>> + I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
>> + return -ENODEV;
>> +
>> + priv->mux = i2c_mux_alloc(priv->client->adapter, &priv->client->dev,
>> + priv->nsources, 0, I2C_MUX_LOCKED,
>> + max9286_i2c_mux_select, NULL);
>> + if (!priv->mux)
>> + return -ENOMEM;
>> +
>> + priv->mux->priv = priv;
>> +
>> + for_each_source(priv, source) {
>> + unsigned int index = to_index(priv, source);
>> +
>> + ret = i2c_mux_add_adapter(priv->mux, 0, index, 0);
>> + if (ret < 0)
>> + goto error;
>> + }
>> +
>> + return 0;
>> +
>> +error:
>> + i2c_mux_del_adapters(priv->mux);
>> + return ret;
>> +}
>> +
>> +static void max9286_configure_i2c(struct max9286_priv *priv, bool localack)
>> +{
>> + u8 config = MAX9286_I2CSLVSH_469NS_234NS | MAX9286_I2CSLVTO_1024US |
>> + MAX9286_I2CMSTBT_105KBPS;
>> +
>> + if (localack)
>> + config |= MAX9286_I2CLOCACK;
>> +
>> + max9286_write(priv, 0x34, config);
>> + usleep_range(3000, 5000);
>> +}
>> +
>> +/*
>> + * max9286_check_video_links() - Make sure video links are detected and locked
>> + *
>> + * Performs safety checks on video link status. Make sure they are detected
>> + * and all enabled links are locked.
>> + *
>> + * Returns 0 for success, -EIO for errors.
>> + */
>> +static int max9286_check_video_links(struct max9286_priv *priv)
>> +{
>> + unsigned int i;
>> + int ret;
>> +
>> + /*
>> + * Make sure valid video links are detected.
>> + * The delay is not characterized in de-serializer manual, wait up
>> + * to 5 ms.
>> + */
>> + for (i = 0; i < 10; i++) {
>> + ret = max9286_read(priv, 0x49);
>> + if (ret < 0)
>> + return -EIO;
>> +
>> + if ((ret & MAX9286_VIDEO_DETECT_MASK) == priv->source_mask)
>> + break;
>> +
>> + usleep_range(350, 500);
>> + }
>> +
>> + if (i == 10) {
>> + dev_err(&priv->client->dev,
>> + "Unable to detect video links: 0x%02x\n", ret);
>> + return -EIO;
>> + }
>> +
>> + /* Make sure all enabled links are locked (4ms max). */
>> + for (i = 0; i < 10; i++) {
>> + ret = max9286_read(priv, 0x27);
>> + if (ret < 0)
>> + return -EIO;
>> +
>> + if (ret & MAX9286_LOCKED)
>> + break;
>> +
>> + usleep_range(350, 450);
>> + }
>> +
>> + if (i == 10) {
>> + dev_err(&priv->client->dev, "Not all enabled links locked\n");
>> + return -EIO;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +/*
>> + * max9286_check_config_link() - Detect and wait for configuration links
>> + *
>> + * Determine if the configuration channel is up and settled for a link.
>> + *
>> + * Returns 0 for success, -EIO for errors.
>> + */
>> +static int max9286_check_config_link(struct max9286_priv *priv,
>> + unsigned int source_mask)
>> +{
>> + unsigned int conflink_mask = (source_mask & 0x0f) << 4;
>> + unsigned int i;
>> + int ret;
>> +
>> + /*
>> + * Make sure requested configuration links are detected.
>> + * The delay is not characterized in the chip manual: wait up
>> + * to 5 milliseconds.
>> + */
>> + for (i = 0; i < 10; i++) {
>> + ret = max9286_read(priv, 0x49) & 0xf0;
>> + if (ret < 0)
>> + return -EIO;
>> +
>> + if (ret == conflink_mask)
>> + break;
>> +
>> + usleep_range(350, 500);
>> + }
>> +
>> + if (ret != conflink_mask) {
>> + dev_err(&priv->client->dev,
>> + "Unable to detect configuration links: 0x%02x expected 0x%02x\n",
>> + ret, conflink_mask);
>> + return -EIO;
>> + }
>> +
>> + dev_info(&priv->client->dev,
>> + "Successfully detected configuration links after %u loops: 0x%02x\n",
>> + i, conflink_mask);
>> +
>> + return 0;
>> +}
>> +
>> +/* -----------------------------------------------------------------------------
>> + * V4L2 Subdev
>> + */
>> +
>> +static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
>> + struct v4l2_subdev *subdev,
>> + struct v4l2_async_subdev *asd)
>> +{
>> + struct max9286_priv *priv = sd_to_max9286(notifier->sd);
>> + struct max9286_source *source = asd_to_max9286_source(asd);
>> + unsigned int index = to_index(priv, source);
>> + unsigned int src_pad;
>> + int ret;
>> +
>> + ret = media_entity_get_fwnode_pad(&subdev->entity,
>> + source->fwnode,
>> + MEDIA_PAD_FL_SOURCE);
>> + if (ret < 0) {
>> + dev_err(&priv->client->dev,
>> + "Failed to find pad for %s\n", subdev->name);
>> + return ret;
>> + }
>> +
>> + priv->bound_sources |= BIT(index);
>> + source->sd = subdev;
>> + src_pad = ret;
>> +
>> + ret = media_create_pad_link(&source->sd->entity, src_pad,
>> + &priv->sd.entity, index,
>> + MEDIA_LNK_FL_ENABLED |
>> + MEDIA_LNK_FL_IMMUTABLE);
>> + if (ret) {
>> + dev_err(&priv->client->dev,
>> + "Unable to link %s:%u -> %s:%u\n",
>> + source->sd->name, src_pad, priv->sd.name, index);
>> + return ret;
>> + }
>> +
>> + dev_dbg(&priv->client->dev, "Bound %s pad: %u on index %u\n",
>> + subdev->name, src_pad, index);
>> +
>> + /*
>> + * We can only register v4l2_async_notifiers which do not provide a
>> + * means to register a complete callback. bound_sources allows us to
>> + * identify when all remove serializers have completed their probe.
>> + */
>> + if (priv->bound_sources != priv->source_mask)
>> + return 0;
>> +
>> + /*
>> + * All enabled sources have probed and enabled their reverse control
>> + * channels:
>> + *
>> + * - Verify all configuration links are properly detected
>> + * - Disable auto-ack as communication on the control channel are now
>> + * stable.
>> + */
>> + max9286_check_config_link(priv, priv->source_mask);
>> +
>> + /*
>> + * Re-configure I2C with local acknowledge disabled after cameras have
>> + * probed.
>> + */
>> + max9286_configure_i2c(priv, false);
>> +
>> + return 0;
>> +}
>> +
>> +static void max9286_notify_unbind(struct v4l2_async_notifier *notifier,
>> + struct v4l2_subdev *subdev,
>> + struct v4l2_async_subdev *asd)
>> +{
>> + struct max9286_source *source = asd_to_max9286_source(asd);
>> +
>> + source->sd = NULL;
>> +}
>> +
>> +static const struct v4l2_async_notifier_operations max9286_notify_ops = {
>> + .bound = max9286_notify_bound,
>> + .unbind = max9286_notify_unbind,
>> +};
>> +
>> +static int max9286_v4l2_notifier_register(struct max9286_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + struct max9286_source *source = NULL;
>> + int ret;
>> +
>> + if (!priv->nsources)
>> + return 0;
>> +
>> + v4l2_async_notifier_init(&priv->notifier);
>> +
>> + for_each_source(priv, source) {
>> + unsigned int i = to_index(priv, source);
>> +
>> + source->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
>> + source->asd.match.fwnode = source->fwnode;
>> +
>> + ret = v4l2_async_notifier_add_subdev(&priv->notifier,
>> + &source->asd);
>> + if (ret) {
>> + dev_err(dev, "Failed to add subdev for source %d", i);
>> + v4l2_async_notifier_cleanup(&priv->notifier);
>> + return ret;
>> + }
>> +
>> + /*
>> + * Balance the reference counting handled through
>> + * v4l2_async_notifier_cleanup()
>> + */
>> + fwnode_handle_get(source->fwnode);
>> + }
>> +
>> + priv->notifier.ops = &max9286_notify_ops;
>> +
>> + ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier);
>> + if (ret) {
>> + dev_err(dev, "Failed to register subdev_notifier");
>> + v4l2_async_notifier_cleanup(&priv->notifier);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void max9286_v4l2_notifier_unregister(struct max9286_priv *priv)
>> +{
>> + if (!priv->nsources)
>> + return;
>> +
>> + v4l2_async_notifier_unregister(&priv->notifier);
>> + v4l2_async_notifier_cleanup(&priv->notifier);
>> +}
>> +
>> +static int max9286_s_stream(struct v4l2_subdev *sd, int enable)
>> +{
>> + struct max9286_priv *priv = sd_to_max9286(sd);
>> + struct max9286_source *source;
>> + unsigned int i;
>> + bool sync = false;
>> + int ret;
>> +
>> + if (enable) {
>> + /*
>> + * The frame sync between cameras is transmitted across the
>> + * reverse channel as GPIO. We must open all channels while
>> + * streaming to allow this synchronisation signal to be shared.
>> + */
>> + max9286_i2c_mux_open(priv);
>
> What does this do here, actually? What happens if the user attempts to
> access the sensor before this call?
Before this point the i2c-mux works in a per-channel mode. So only the
channel being used to communicate is open, and any write to another
camera/channel will close and reopen.
See:
- max9286_i2c_mux_select() /* Open a single channel */
- max9286_i2c_mux_open() /* Open all channels */
- max9286_i2c_mux_close() /* Close all channels */
This prevents cross-communication between cameras and ensures that the
i2c-traffic across the i2c-muxes is controlled.
When we 'stream on', however we must have all channels open to allow the
synchronisation signals to be communicated between the cameras
(which I believe are technically 'gpio' but these can only pass if the
'mux' channel is open)
>
>> +
>> + /* Start all cameras. */
>> + for_each_source(priv, source) {
>> + ret = v4l2_subdev_call(source->sd, video, s_stream, 1);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> + ret = max9286_check_video_links(priv);
>> + if (ret)
>> + return ret;
>> +
>> + /*
>> + * Wait until frame synchronization is locked.
>> + *
>> + * Manual says frame sync locking should take ~6 VTS.
>> + * From practical experience at least 8 are required. Give
>> + * 12 complete frames time (~400ms at 30 fps) to achieve frame
>> + * locking before returning error.
>> + */
>> + for (i = 0; i < 40; i++) {
>> + if (max9286_read(priv, 0x31) & MAX9286_FSYNC_LOCKED) {
>> + sync = true;
>> + break;
>> + }
>> + usleep_range(9000, 11000);
>> + }
>> +
>> + if (!sync) {
>> + dev_err(&priv->client->dev,
>> + "Failed to get frame synchronization\n");
>> + return -EXDEV; /* Invalid cross-device link */
>> + }
>> +
>> + /*
>> + * Enable CSI output, VC set according to link number.
>> + * Bit 7 must be set (chip manual says it's 0 and reserved).
>> + */
>> + max9286_write(priv, 0x15, 0x80 | MAX9286_VCTYPE |
>> + MAX9286_CSIOUTEN | MAX9286_0X15_RESV);
>> + } else {
>> + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV);
>> +
>> + /* Stop all cameras. */
>> + for_each_source(priv, source)
>> + v4l2_subdev_call(source->sd, video, s_stream, 0);
>> +
>> + max9286_i2c_mux_close(priv);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_pad_config *cfg,
>> + struct v4l2_subdev_mbus_code_enum *code)
>> +{
>> + if (code->pad || code->index > 0)
>> + return -EINVAL;
>> +
>> + code->code = MEDIA_BUS_FMT_UYVY8_2X8;
>> +
>> + return 0;
>> +}
>> +
>> +static struct v4l2_mbus_framefmt *
>> +max9286_get_pad_format(struct max9286_priv *priv,
>> + struct v4l2_subdev_pad_config *cfg,
>> + unsigned int pad, u32 which)
>> +{
>> + switch (which) {
>> + case V4L2_SUBDEV_FORMAT_TRY:
>> + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad);
>> + case V4L2_SUBDEV_FORMAT_ACTIVE:
>> + return &priv->fmt[pad];
>> + default:
>> + return NULL;
>> + }
>> +}
>> +
>> +static int max9286_set_fmt(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_pad_config *cfg,
>> + struct v4l2_subdev_format *format)
>> +{
>> + struct max9286_priv *priv = sd_to_max9286(sd);
>> + struct v4l2_mbus_framefmt *cfg_fmt;
>> +
>> + if (format->pad >= MAX9286_SRC_PAD)
>> + return -EINVAL;
>> +
>> + /* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */
>> + switch (format->format.code) {
>> + case MEDIA_BUS_FMT_UYVY8_2X8:
>> + case MEDIA_BUS_FMT_VYUY8_2X8:
>> + case MEDIA_BUS_FMT_YUYV8_2X8:
>> + case MEDIA_BUS_FMT_YVYU8_2X8:
>> + break;
>> + default:
>> + format->format.code = MEDIA_BUS_FMT_YUYV8_2X8;
>> + break;
>> + }
>> +
>> + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which);
>> + if (!cfg_fmt)
>> + return -EINVAL;
>> +
>> + *cfg_fmt = format->format;
>
> I believe access to cfg_fmt needs to be serialised, by using e.g. a mutex.
>
Ack.
>> +
>> + return 0;
>> +}
>> +
>> +static int max9286_get_fmt(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_pad_config *cfg,
>> + struct v4l2_subdev_format *format)
>> +{
>> + struct max9286_priv *priv = sd_to_max9286(sd);
>> + struct v4l2_mbus_framefmt *cfg_fmt;
>> +
>> + if (format->pad >= MAX9286_SRC_PAD)
>> + return -EINVAL;
>> +
>> + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which);
>> + if (!cfg_fmt)
>> + return -EINVAL;
>> +
>> + format->format = *cfg_fmt;
>
> Same here.
>
>> +
>> + return 0;
>> +}
>> +
>> +static const struct v4l2_subdev_video_ops max9286_video_ops = {
>> + .s_stream = max9286_s_stream,
>> +};
>> +
>> +static const struct v4l2_subdev_pad_ops max9286_pad_ops = {
>> + .enum_mbus_code = max9286_enum_mbus_code,
>> + .get_fmt = max9286_get_fmt,
>> + .set_fmt = max9286_set_fmt,
>> +};
>> +
>> +static const struct v4l2_subdev_ops max9286_subdev_ops = {
>> + .video = &max9286_video_ops,
>> + .pad = &max9286_pad_ops,
>> +};
>> +
>> +static void max9286_init_format(struct v4l2_mbus_framefmt *fmt)
>> +{
>> + fmt->width = 1280;
>> + fmt->height = 800;
>> + fmt->code = MEDIA_BUS_FMT_UYVY8_2X8;
>> + fmt->colorspace = V4L2_COLORSPACE_SRGB;
>> + fmt->field = V4L2_FIELD_NONE;
>> + fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
>> + fmt->quantization = V4L2_QUANTIZATION_DEFAULT;
>> + fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
>> +}
>> +
>> +static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
>> +{
>> + struct v4l2_mbus_framefmt *format;
>> + unsigned int i;
>> +
>> + for (i = 0; i < MAX9286_N_SINKS; i++) {
>> + format = v4l2_subdev_get_try_format(subdev, fh->pad, i);
>> + max9286_init_format(format);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = {
>> + .open = max9286_open,
>> +};
>> +
>> +static int max9286_v4l2_register(struct max9286_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + struct fwnode_handle *ep;
>> + int ret;
>> + int i;
>> +
>> + /* Register v4l2 async notifiers for connected Camera subdevices */
>> + ret = max9286_v4l2_notifier_register(priv);
>> + if (ret) {
>> + dev_err(dev, "Unable to register V4L2 async notifiers\n");
>> + return ret;
>> + }
>> +
>> + /* Configure V4L2 for the MAX9286 itself */
>> +
>> + v4l2_i2c_subdev_init(&priv->sd, priv->client, &max9286_subdev_ops);
>> + priv->sd.internal_ops = &max9286_subdev_internal_ops;
>> + priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
>> +
>> + v4l2_ctrl_handler_init(&priv->ctrls, 1);
>> + /*
>> + * FIXME: Compute the real pixel rate. The 50 MP/s value comes from the
>> + * hardcoded frequency in the BSP CSI-2 receiver driver.
>> + */
>> + v4l2_ctrl_new_std(&priv->ctrls, NULL, V4L2_CID_PIXEL_RATE,
>> + 50000000, 50000000, 1, 50000000);
>
> This driver wouldn't get any notification on the upstream pixel rate
> changes. Something to think about indeed.
Indeed, we're trying to fix this up now as we need to convey the correct
pixel rate when 4 cameras are used with higher framesizes which requires
a higher bus speed.
>> + priv->sd.ctrl_handler = &priv->ctrls;
>> + ret = priv->ctrls.error;
>> + if (ret)
>> + goto err_async;
>> +
>> + priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
>> +
>> + priv->pads[MAX9286_SRC_PAD].flags = MEDIA_PAD_FL_SOURCE;
>> + for (i = 0; i < MAX9286_SRC_PAD; i++)
>> + priv->pads[i].flags = MEDIA_PAD_FL_SINK;
>> + ret = media_entity_pads_init(&priv->sd.entity, MAX9286_N_PADS,
>> + priv->pads);
>> + if (ret)
>> + goto err_async;
>> +
>> + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), MAX9286_SRC_PAD,
>
> The graph ports and entity pads match now, but they're not the same thing.
>
> I'd add at least comment along the definition it is used for OF as well.
Ayeee ok.
>
>> + 0, 0);
>> + if (!ep) {
>> + dev_err(dev, "Unable to retrieve endpoint on \"port@4\"\n");
>> + ret = -ENOENT;
>> + goto err_async;
>> + }
>> + priv->sd.fwnode = ep;
>> +
>> + ret = v4l2_async_register_subdev(&priv->sd);
>> + if (ret < 0) {
>> + dev_err(dev, "Unable to register subdevice\n");
>> + goto err_put_node;
>> + }
>> +
>> + return 0;
>> +
>> +err_put_node:
>> + fwnode_handle_put(ep);
>> +err_async:
>> + max9286_v4l2_notifier_unregister(priv);
>> +
>> + return ret;
>> +}
>> +
>> +static void max9286_v4l2_unregister(struct max9286_priv *priv)
>> +{
>> + fwnode_handle_put(priv->sd.fwnode);
>> + v4l2_async_unregister_subdev(&priv->sd);
>> + max9286_v4l2_notifier_unregister(priv);
>> +}
>> +
>> +/* -----------------------------------------------------------------------------
>> + * Probe/Remove
>> + */
>> +
>> +static int max9286_setup(struct max9286_priv *priv)
>> +{
>> + /*
>> + * Link ordering values for all enabled links combinations. Orders must
>> + * be assigned sequentially from 0 to the number of enabled links
>> + * without leaving any hole for disabled links. We thus assign orders to
>> + * enabled links first, and use the remaining order values for disabled
>> + * links are all links must have a different order value;
>> + */
>> + static const u8 link_order[] = {
>> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxxx */
>> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxx0 */
>> + (3 << 6) | (2 << 4) | (0 << 2) | (1 << 0), /* xx0x */
>> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xx10 */
>> + (3 << 6) | (0 << 4) | (2 << 2) | (1 << 0), /* x0xx */
>> + (3 << 6) | (1 << 4) | (2 << 2) | (0 << 0), /* x1x0 */
>> + (3 << 6) | (1 << 4) | (0 << 2) | (2 << 0), /* x10x */
>> + (3 << 6) | (1 << 4) | (1 << 2) | (0 << 0), /* x210 */
>> + (0 << 6) | (3 << 4) | (2 << 2) | (1 << 0), /* 0xxx */
>> + (1 << 6) | (3 << 4) | (2 << 2) | (0 << 0), /* 1xx0 */
>> + (1 << 6) | (3 << 4) | (0 << 2) | (2 << 0), /* 1x0x */
>> + (2 << 6) | (3 << 4) | (1 << 2) | (0 << 0), /* 2x10 */
>> + (1 << 6) | (0 << 4) | (3 << 2) | (2 << 0), /* 10xx */
>> + (2 << 6) | (1 << 4) | (3 << 2) | (0 << 0), /* 21x0 */
>> + (2 << 6) | (1 << 4) | (0 << 2) | (3 << 0), /* 210x */
>> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* 3210 */
>> + };
>> +
>> + /*
>> + * Set the I2C bus speed.
>> + *
>> + * Enable I2C Local Acknowledge during the probe sequences of the camera
>> + * only. This should be disabled after the mux is initialised.
>> + */
>> + max9286_configure_i2c(priv, true);
>> +
>> + /*
>> + * Reverse channel setup.
>> + *
>> + * - Enable custom reverse channel configuration (through register 0x3f)
>> + * and set the first pulse length to 35 clock cycles.
>> + * - Increase the reverse channel amplitude to 170mV to accommodate the
>> + * high threshold enabled by the serializer driver.
>> + */
>> + max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35));
>> + max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) |
>> + MAX9286_REV_AMP_X);
>> + usleep_range(2000, 2500);
>> +
>> + /*
>> + * Enable GMSL links, mask unused ones and autodetect link
>> + * used as CSI clock source.
>> + */
>> + max9286_write(priv, 0x00, MAX9286_MSTLINKSEL_AUTO | priv->route_mask);
>> + max9286_write(priv, 0x0b, link_order[priv->route_mask]);
>> + max9286_write(priv, 0x69, (0xf & ~priv->route_mask));
>> +
>> + /*
>> + * Video format setup:
>> + * Disable CSI output, VC is set according to Link number.
>> + */
>> + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV);
>> +
>> + /* Enable CSI-2 Lane D0-D3 only, DBL mode, YUV422 8-bit. */
>> + max9286_write(priv, 0x12, MAX9286_CSIDBL | MAX9286_DBL |
>> + MAX9286_CSILANECNT(priv->csi2_data_lanes) |
>> + MAX9286_DATATYPE_YUV422_8BIT);
>> +
>> + /* Automatic: FRAMESYNC taken from the slowest Link. */
>> + max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ |
>> + MAX9286_FSYNCMETH_AUTO);
>> +
>> + /* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */
>> + max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS |
>> + MAX9286_HVSRC_D14);
>> +
>> + /*
>> + * Wait for 2ms to allow the link to resynchronize after the
>> + * configuration change.
>> + */
>> + usleep_range(2000, 5000);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id max9286_dt_ids[] = {
>> + { .compatible = "maxim,max9286" },
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, max9286_dt_ids);
Hrm ... how has this ended up all the way up here ... moving somewhere
more appropriate.
>> +
>> +static void max9286_gpio_set(struct gpio_chip *chip,
>> + unsigned int offset, int value)
>> +{
>> + struct max9286_priv *priv = gpiochip_get_data(chip);
>> +
>> + if (value)
>> + priv->gpio_state |= BIT(offset);
>> + else
>> + priv->gpio_state &= ~BIT(offset);
>> +
>> + max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state);
>> +}
>> +
>> +static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset)
>> +{
>> + struct max9286_priv *priv = gpiochip_get_data(chip);
>> +
>> + return priv->gpio_state & BIT(offset);
>> +}
>> +
>> +static int max9286_gpio(struct max9286_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + struct gpio_chip *gpio = &priv->gpio;
>> + int ret;
>> +
>> + static const char * const names[] = {
>> + "GPIO0OUT",
>> + "GPIO1OUT",
>> + };
>> +
>> + /* Configure the GPIO */
>> + gpio->label = dev_name(dev);
>> + gpio->parent = dev;
>> + gpio->owner = THIS_MODULE;
>> + gpio->of_node = dev->of_node;
>> + gpio->ngpio = 2;
>> + gpio->base = -1;
>> + gpio->set = max9286_gpio_set;
>> + gpio->get = max9286_gpio_get;
>> + gpio->can_sleep = true;
>> + gpio->names = names;
>> +
>> + /* GPIO values default to high */
>> + priv->gpio_state = BIT(0) | BIT(1);
>> +
>> + ret = devm_gpiochip_add_data(dev, gpio, priv);
>> + if (ret)
>> + dev_err(dev, "Unable to create gpio_chip\n");
>> +
>> + return ret;
>> +}
>> +
>> +static int max9286_init(struct device *dev)
>> +{
>> + struct max9286_priv *priv;
>> + struct i2c_client *client;
>> + int ret;
>> +
>> + /* Skip non-max9286 devices. */
>> + if (!dev->of_node || !of_match_node(max9286_dt_ids, dev->of_node))
>> + return 0;
Ah - because of this - which is unnecessary - (part of multi-device
workaround - removing).
>> +
>> + client = to_i2c_client(dev);
>> + priv = i2c_get_clientdata(client);
>> +
>> + /* Enable the bus power. */
>> + ret = regulator_enable(priv->regulator);
>> + if (ret < 0) {
>> + dev_err(&client->dev, "Unable to turn PoC on\n");
>> + return ret;
>> + }
>> +
>> + priv->poc_enabled = true;
>> +
>> + ret = max9286_setup(priv);
>> + if (ret) {
>> + dev_err(dev, "Unable to setup max9286\n");
>> + goto err_regulator;
>> + }
>> +
>> + /*
>> + * Register all V4L2 interactions for the MAX9286 and notifiers for
>> + * any subdevices connected.
>> + */
>> + ret = max9286_v4l2_register(priv);
>> + if (ret) {
>> + dev_err(dev, "Failed to register with V4L2\n");
>> + goto err_regulator;
>> + }
>> +
>> + ret = max9286_i2c_mux_init(priv);
>> + if (ret) {
>> + dev_err(dev, "Unable to initialize I2C multiplexer\n");
>> + goto err_v4l2_register;
>> + }
>> +
>> + /* Leave the mux channels disabled until they are selected. */
>> + max9286_i2c_mux_close(priv);
>> +
>> + return 0;
>> +
>> +err_v4l2_register:
>> + max9286_v4l2_unregister(priv);
>> +err_regulator:
>> + regulator_disable(priv->regulator);
>> + priv->poc_enabled = false;
>> +
>> + return ret;
>> +}
>> +
>> +static void max9286_cleanup_dt(struct max9286_priv *priv)
>> +{
>> + struct max9286_source *source;
>> +
>> + for_each_source(priv, source) {
>> + fwnode_handle_put(source->fwnode);
>> + source->fwnode = NULL;
>> + }
>> +}
>> +
>> +static int max9286_parse_dt(struct max9286_priv *priv)
>> +{
>> + struct device *dev = &priv->client->dev;
>> + struct device_node *i2c_mux;
>> + struct device_node *node = NULL;
>> + unsigned int i2c_mux_mask = 0;
>> +
>> + of_node_get(dev->of_node);
>> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux");
>> + if (!i2c_mux) {
>> + dev_err(dev, "Failed to find i2c-mux node\n");
>> + return -EINVAL;
>> + }
>> +
>> + /* Identify which i2c-mux channels are enabled */
>> + for_each_child_of_node(i2c_mux, node) {
>> + u32 id = 0;
>> +
>> + of_property_read_u32(node, "reg", &id);
>> + if (id >= MAX9286_NUM_GMSL)
>> + continue;
>> +
>> + if (!of_device_is_available(node)) {
>> + dev_dbg(dev, "Skipping disabled I2C bus port %u\n",
>> + id);
>
> Fits on the same line.
Ah yes, just ;-)
>
>> + continue;
>> + }
>> +
>> + i2c_mux_mask |= BIT(id);
>> + }
>> + of_node_put(node);
>> + of_node_put(i2c_mux);
>> +
>> + /* Parse the endpoints */
>> + for_each_endpoint_of_node(dev->of_node, node) {
>> + struct max9286_source *source;
>> + struct of_endpoint ep;
>> +
>> + of_graph_parse_endpoint(node, &ep);
>> + dev_dbg(dev, "Endpoint %pOF on port %d",
>> + ep.local_node, ep.port);
>> +
>> + if (ep.port > MAX9286_NUM_GMSL) {
>> + dev_err(dev, "Invalid endpoint %s on port %d",
>> + of_node_full_name(ep.local_node), ep.port);
>> + continue;
>> + }
>> +
>> + /* For the source endpoint just parse the bus configuration. */
>> + if (ep.port == MAX9286_SRC_PAD) {
>> + struct v4l2_fwnode_endpoint vep = {
>> + .bus_type = V4L2_MBUS_CSI2_DPHY
>> + };
>> + int ret;
>> +
>> + ret = v4l2_fwnode_endpoint_parse(
>> + of_fwnode_handle(node), &vep);
>> + if (ret) {
>> + of_node_put(node);
>> + return ret;
>> + }
>> +
>> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) {
>> + dev_err(dev,
>> + "Media bus %u type not supported\n",
>> + vep.bus_type);
>> + v4l2_fwnode_endpoint_free(&vep);
>> + of_node_put(node);
>> + return -EINVAL;
>> + }
>> +
>> + priv->csi2_data_lanes =
>> + vep.bus.mipi_csi2.num_data_lanes;
>> + v4l2_fwnode_endpoint_free(&vep);
>> +
>> + continue;
>> + }
>> +
>> + /* Skip if the corresponding GMSL link is unavailable. */
>> + if (!(i2c_mux_mask & BIT(ep.port)))
>> + continue;
>> +
>> + if (priv->sources[ep.port].fwnode) {
>> + dev_err(dev,
>> + "Multiple port endpoints are not supported: %d",
>> + ep.port);
>> +
>> + continue;
>> + }
>> +
>> + source = &priv->sources[ep.port];
>> + source->fwnode = fwnode_graph_get_remote_endpoint(
>> + of_fwnode_handle(node));
>> + if (!source->fwnode) {
>> + dev_err(dev,
>> + "Endpoint %pOF has no remote endpoint connection\n",
>> + ep.local_node);
>> +
>> + continue;
>> + }
>> +
>> + priv->source_mask |= BIT(ep.port);
>> + priv->nsources++;
>> + }
>> + of_node_put(node);
>> +
>> + priv->route_mask = priv->source_mask;
>> +
>> + return 0;
>> +}
>> +
>> +static int max9286_probe(struct i2c_client *client)
>> +{
>> + struct max9286_priv *priv;
>> + unsigned int i;
>> + int ret;
>> +
>> + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
>> + if (!priv)
>> + return -ENOMEM;
>
> You won't lose anything by using the devm_ variant here.
Indeed,
>
>> +
>> + priv->client = client;
>> + i2c_set_clientdata(client, priv);
>> +
>> + for (i = 0; i < MAX9286_N_SINKS; i++)
>> + max9286_init_format(&priv->fmt[i]);
>> +
>> + ret = max9286_parse_dt(priv);
>> + if (ret)
>> + return ret;
>
> But you can avoid accidental memory leaks for nothing. :-)
It would be good not to leak indeed!
>
>> +
>> + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable",
>> + GPIOD_OUT_HIGH);
>> + if (IS_ERR(priv->gpiod_pwdn))
>> + return PTR_ERR(priv->gpiod_pwdn);
>> +
>> + gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn");
>> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 1);
>> +
>> + /* Wait at least 4ms before the I2C lines latch to the address */
>> + if (priv->gpiod_pwdn)
>> + usleep_range(4000, 5000);
>> +
>> + ret = max9286_gpio(priv);
>> + if (ret)
This fails to clean up after the _parse_dt() path here too :-(
>> + return ret;
>> +
>> + priv->regulator = regulator_get(&client->dev, "poc");
>
> Why not devm_regulator_get()?
Indeed, should be fine I believe.
Updated.
>
>> + if (IS_ERR(priv->regulator)) {
>> + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER)
>> + dev_err(&client->dev,
>> + "Unable to get PoC regulator (%ld)\n",
>> + PTR_ERR(priv->regulator));
>> + ret = PTR_ERR(priv->regulator);
>> + priv->regulator = NULL;
>> + goto err_free;
>> + }
>> +
>> + /*
>> + * We can have multiple MAX9286 instances on the same physical I2C
>> + * bus, and I2C children behind ports of separate MAX9286 instances
>> + * having the same I2C address. As the MAX9286 starts by default with
>> + * all ports enabled, we need to disable all ports on all MAX9286
>> + * instances before proceeding to further initialize the devices and
>> + * instantiate children.
>> + *
>> + * Start by just disabling all channels on the current device. Then,
>> + * if all other MAX9286 on the parent bus have been probed, proceed
>> + * to initialize them all, including the current one.
>> + */
>> + max9286_i2c_mux_close(priv);
>> +
>> + /*
>> + * The MAX9286 initialises with auto-acknowledge enabled by default.
>> + * This means that if multiple MAX9286 devices are connected to an I2C
>> + * bus, another MAX9286 could ack I2C transfers meant for a device on
>> + * the other side of the GMSL links for this MAX9286 (such as a
>> + * MAX9271). To prevent that disable auto-acknowledge early on; it
>> + * will be enabled later as needed.
>> + */
>> + max9286_configure_i2c(priv, false);
>> +
>> + ret = max9286_init(&client->dev);
>> + if (ret < 0)
>> + goto err_regulator;
>> +
>> + return 0;
>> +
>> +err_regulator:
>> + regulator_put(priv->regulator);
>> + max9286_i2c_mux_close(priv);
>> + max9286_configure_i2c(priv, false);
>> +err_free:
>> + max9286_cleanup_dt(priv);
>> + kfree(priv);
>> +
>> + return ret;
>> +}
>> +
>> +static int max9286_remove(struct i2c_client *client)
>> +{
>> + struct max9286_priv *priv = i2c_get_clientdata(client);
>> +
>> + i2c_mux_del_adapters(priv->mux);
>> +
>> + max9286_v4l2_unregister(priv);
>> +
>> + if (priv->poc_enabled)
>> + regulator_disable(priv->regulator);
>
> Hmm. Isn't poc_enabled always true (and the regulator enabled) here? If
> so, you could disable the regulator unconditionally.
Hrm ... in /this/ variant of the driver yes, but we have to do a
*really* horrible workaround for an issue if we have two of the same
device on the same I2C bus (which of course is the platform
configuration on our boards).
I'll move this to the support patch for two max9286's on the same bus.
>> + regulator_put(priv->regulator);
>> +
>> + max9286_cleanup_dt(priv);
>> +
>> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);
>> +
>> + kfree(priv);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct i2c_device_id max9286_id[] = {
>> + { "max9286", 0 },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(i2c, max9286_id);
>
> Do you need this table?
'Technically' this table is still required for module autoloading, until
some solution such as [0] is merged:
[0] [PATCH RFC] modpost: Support I2C Aliases from OF tables
https://lore.kernel.org/lkml/20190710193918.31135-1-kieran.bingham+renesas@xxxxxxxxxxxxxxxx/
(Do you have any comments on [0] per chance too?)
However in practice, I think the only restriction that gets lost is
device instantiation from sysfs, which wouldn't really work for this
driver anyway, because it requires a description of connected endpoints.
So - yes, I think it's quite safe to drop it.
>> +
>> +static struct i2c_driver max9286_i2c_driver = {
>> + .driver = {
>> + .name = "max9286",
>> + .of_match_table = of_match_ptr(max9286_dt_ids),
>> + },
>> + .probe_new = max9286_probe,
>> + .remove = max9286_remove,
>> + .id_table = max9286_id,
>> +};
>> +
>> +module_i2c_driver(max9286_i2c_driver);
>> +
>> +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver");
>> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov");
>> +MODULE_LICENSE("GPL");
>
