On 7/1/19 9:58 AM, Jacopo Mondi wrote:
[...]
>> +#define ISL7998x_REG_P5_H_LINE_CNT_1 ISL7998x_REG(5, 0x3a)
>> +#define ISL7998x_REG_P5_H_LINE_CNT_2 ISL7998x_REG(5, 0x3b)
>> +#define ISL7998x_REG_P5_HIST_LINE_CNT_1 ISL7998x_REG(5, 0x3c)
>> +#define ISL7998x_REG_P5_HIST_LINE_CNT_2 ISL7998x_REG(5, 0x3d)
>
> Not all the above definitions are used. While it doesn't hurt to have
> them here, it's a pretty scary list of registers entries.
I guess it's good to have a full list of registers available ?
>> +static const struct reg_sequence isl7998x_init_seq_1[] = {
>> + { ISL7998x_REG_P0_SHORT_DIAG_IRQ_EN, 0xff },
>> + { ISL7998x_REG_Px_DEC_SDT(0x1), 0x07 },
>> + { ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(0x1), 0x03 },
>> + { ISL7998x_REG_Px_DEC_SDT(0x2), 0x07 },
>> + { ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(0x2), 0x03 },
>> + { ISL7998x_REG_Px_DEC_SDT(0x3), 0x07 },
>> + { ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(0x3), 0x03 },
>> + { ISL7998x_REG_Px_DEC_SDT(0x4), 0x07 },
>> + { ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(0x4), 0x03 },
>> + { ISL7998x_REG_P5_LI_ENGINE_CTL, 0x00 },
>> + { ISL7998x_REG_P0_SW_RESET_CTL, 0x1f, 10 },
>> + { ISL7998x_REG_P0_IO_BUFFER_CTL, 0x00 },
>> + { ISL7998x_REG_P0_MPP2_SYNC_CTL, 0xc9 },
>> + { ISL7998x_REG_P0_IRQ_SYNC_CTL, 0xc9 },
>> + { ISL7998x_REG_P0_CHAN_1_IRQ, 0x03 },
>> + { ISL7998x_REG_P0_CHAN_2_IRQ, 0x00 },
>> + { ISL7998x_REG_P0_CHAN_3_IRQ, 0x00 },
>> + { ISL7998x_REG_P0_CHAN_4_IRQ, 0x00 },
>> + { ISL7998x_REG_P5_LI_ENGINE_CTL, 0x02 },
>> + { ISL7998x_REG_P5_LI_ENGINE_LINE_CTL, 0x85 },
>> + { ISL7998x_REG_P5_LI_ENGINE_PIC_WIDTH, 0xa0 },
>> + { ISL7998x_REG_P5_LI_ENGINE_SYNC_CTL, 0x18 },
>> + { ISL7998x_REG_P5_LI_ENGINE_TYPE_CTL, 0x40 },
>> + { ISL7998x_REG_P5_LI_ENGINE_FIFO_CTL, 0x40 },
>> + { ISL7998x_REG_P5_MIPI_WCNT_1, 0x05 },
>> + { ISL7998x_REG_P5_MIPI_WCNT_2, 0xa0 },
>> + { ISL7998x_REG_P5_TP_GEN_MIPI, 0x00 },
>> + { ISL7998x_REG_P5_ESC_MODE_TIME_CTL, 0x0c },
>> + { ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL, 0x00 },
>> + { ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_1, 0x00 },
>> + { ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_2, 0x19 },
>> + { ISL7998x_REG_P5_PSF_FIELD_END_CTL_1, 0x18 },
>> + { ISL7998x_REG_P5_PSF_FIELD_END_CTL_2, 0xf1 },
>> + { ISL7998x_REG_P5_PSF_FIELD_END_CTL_3, 0x00 },
>> + { ISL7998x_REG_P5_PSF_FIELD_END_CTL_4, 0xf1 },
>> + { ISL7998x_REG_P5_MIPI_ANA_DATA_CTL_1, 0x00 },
>> + { ISL7998x_REG_P5_MIPI_ANA_DATA_CTL_2, 0x00 },
>> + { ISL7998x_REG_P5_MIPI_ANA_CLK_CTL, 0x00 },
>> + { ISL7998x_REG_P5_PLL_ANA_STATUS, 0xc0 },
>> + { ISL7998x_REG_P5_PLL_ANA_MISC_CTL, 0x18 },
>> + { ISL7998x_REG_P5_PLL_ANA, 0x00 },
>> + { ISL7998x_REG_P0_SW_RESET_CTL, 0x10, 10 },
>> + /* Page 0xf means write to all of pages 1,2,3,4 */
>> + { ISL7998x_REG_Px_DEC_VDELAY_LO(0xf), 0x14 },
>> + { ISL7998x_REG_Px_DEC_MISC3(0xf), 0xe6 },
>> + { ISL7998x_REG_Px_DEC_CLMD(0xf), 0x85 },
>> + { ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(0xf), 0x11 },
>> + { ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf), 0x00 },
>> + { ISL7998x_REG_P0_CLK_CTL_1, 0x1f },
>> + { ISL7998x_REG_P0_CLK_CTL_2, 0x43 },
>> + { ISL7998x_REG_P0_CLK_CTL_3, 0x4f },
>> +};
>> +
>> +static const struct reg_sequence isl7998x_init_seq_2[] = {
>
> Is seq_2 alternative to the first?
No, it's second part of the register init sequence .
> Care to comment a bit what these
> do, if we have to live with register writes sequences?
Preinit the chip with sane settings. It's a combination of various
register init sequences from various ISL7998x driver mutations.
It's like many other camera drivers -- preload a blob of register writes
to init the chip into some sane defaults which work well.
>> + { ISL7998x_REG_P5_LI_ENGINE_SYNC_CTL, 0x10 },
>> + { ISL7998x_REG_P5_LI_ENGINE_VC_ASSIGNMENT, 0xe4 },
>> + { ISL7998x_REG_P5_LI_ENGINE_TYPE_CTL, 0x00 },
>> + { ISL7998x_REG_P5_LI_ENGINE_FIFO_CTL, 0x60 },
>> + { ISL7998x_REG_P5_MIPI_READ_START_CTL, 0x2b },
>> + { ISL7998x_REG_P5_PSEUDO_FRM_FIELD_CTL, 0x02 },
>> + { ISL7998x_REG_P5_ONE_FIELD_MODE_CTL, 0x00 },
>> + { ISL7998x_REG_P5_MIPI_INT_HW_TST_CTR, 0x62 },
>> + { ISL7998x_REG_P5_TP_GEN_BAR_PATTERN, 0x02 },
>> + { ISL7998x_REG_P5_MIPI_PCNT_PSFRM, 0x36 },
>> + { ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL, 0x00 },
>> + { ISL7998x_REG_P5_MIPI_VBLANK_PSFRM, 0x6c },
>> + { ISL7998x_REG_P5_LI_ENGINE_CTL_2, 0x00 },
>> + { ISL7998x_REG_P5_MIPI_WCNT_1, 0x05 },
>> + { ISL7998x_REG_P5_MIPI_WCNT_2, 0xa0 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_1, 0x77 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_2, 0x17 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_3, 0x08 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_4, 0x38 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_5, 0x14 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_6, 0xf6 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_PARAMS_1, 0x00 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_SOT_PERIOD, 0x17 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_EOT_PERIOD, 0x0a },
>> + { ISL7998x_REG_P5_MIPI_DPHY_PARAMS_2, 0x71 },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_7, 0x7a },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_8, 0x0f },
>> + { ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_9, 0x8c },
>> + { ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL, 0x08 },
>> + { ISL7998x_REG_P5_FIFO_THRSH_CNT_1, 0x01 },
>> + { ISL7998x_REG_P5_FIFO_THRSH_CNT_2, 0x0e },
>> + { ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_1, 0x00 },
>> + { ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_2, 0x00 },
>> + { ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1, 0x03 },
>> + { ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_2, 0xc0 },
>> + { ISL7998x_REG_P5_H_LINE_CNT_1, 0x06 },
>> + { ISL7998x_REG_P5_H_LINE_CNT_2, 0xb3 },
>> + { ISL7998x_REG_P5_HIST_LINE_CNT_1, 0x00 },
>> + { ISL7998x_REG_P5_HIST_LINE_CNT_2, 0xf1 },
>> + { ISL7998x_REG_P5_LI_ENGINE_FIFO_CTL, 0x00 },
>> + { ISL7998x_REG_P5_MIPI_ANA, 0x00 },
>> + /*
>> + * Wait a bit after reset so that the chip can capture a frame
>> + * and update internal line counters.
>> + */
>> + { ISL7998x_REG_P0_SW_RESET_CTL, 0x00, 50 },
>> +};
>> +
>> +struct isl7998x_datafmt {
>> + u32 code;
>> + enum v4l2_colorspace colorspace;
>> +};
>> +
>> +static const struct isl7998x_datafmt isl7998x_colour_fmts[] = {
>> + { MEDIA_BUS_FMT_YUYV8_2X8, V4L2_COLORSPACE_SRGB },
>
> You set the colorspace to 0 in s/g_fmt, while you could simply
> hardcode SRGB if you know that's the one the chip provides (which
> seems reasonable).
Presumably we can have S_FMT switch between these two ?
>> +};
>> +
>> +/* Menu items for LINK_FREQ V4L2 control */
>> +static const s64 link_freq_menu_items[] = {
>> + 108000000, 216000000, 432000000
>> +};
>> +
>> +/* Menu items for TEST_PATTERN V4L2 control */
>> +static const char * const isl7998x_test_pattern_menu[] = {
>> + "Disabled", "Enabled-PAL (720x576)", "Enabled-NTSC (720x480)"
>> +};
>> +
>> +struct isl7998x {
>> + struct v4l2_subdev subdev;
>> + struct regmap *regmap;
>> + struct gpio_desc *pd_gpio;
>> + unsigned int nr_mipi_lanes;
>> + u32 nr_inputs;
>> +
>> + unsigned int width;
>> + unsigned int height;
>> + const struct isl7998x_datafmt *fmt;
>> +#ifdef CONFIG_MEDIA_CONTROLLER
>> + struct media_pad pad;
>> +#endif
>> +
>> + struct v4l2_ctrl_handler ctrl_handler;
>> + struct mutex ctrl_mutex;
>
> it's common practice to state what a mutex protect if it's part of the
> device structure. Care to do so?
I had a look into drivers/media and it seems the common practice is to
state nothing (according to git grep). It's a mutex for the ctrl_handler .
>> + /* V4L2 Controls */
>> + struct v4l2_ctrl *link_freq;
>> + u8 test_pattern_enabled;
>> + u8 test_pattern_bars;
>> + u8 test_pattern_chans;
>> + u8 test_pattern_color;
>> +};
>> +
>> +static struct isl7998x *sd_to_isl7998x(struct v4l2_subdev *sd)
>> +{
>> + return container_of(sd, struct isl7998x, subdev);
>> +}
>> +
>> +static struct isl7998x *i2c_to_isl7998x(const struct i2c_client *client)
>> +{
>> + return sd_to_isl7998x(i2c_get_clientdata(client));
>> +}
>> +
>> +static int isl7998x_init(struct isl7998x *isl7998x)
>> +{
>> + const unsigned int lanes = isl7998x->nr_mipi_lanes;
>> + const u32 isl7998x_video_in_chan_map[] = { 0x00, 0x11, 0x02, 0x02 };
>> + const struct reg_sequence isl7998x_init_seq_custom[] = {
>> + { ISL7998x_REG_P0_VIDEO_IN_CHAN_CTL,
>> + isl7998x_video_in_chan_map[isl7998x->nr_inputs - 1] },
>> + { ISL7998x_REG_P0_CLK_CTL_4, (lanes == 1) ? 0x40 : 0x41 },
>> + { ISL7998x_REG_P5_LI_ENGINE_CTL, (lanes == 1) ? 0x01 : 0x02 },
>> + { ISL7998x_REG_P5_LI_ENGINE_LINE_CTL,
>> + 0x20 | ((isl7998x->width >> 7) & 0x1f) },
>> + { ISL7998x_REG_P5_LI_ENGINE_PIC_WIDTH,
>> + (isl7998x->width << 1) & 0xff },
>> + };
>> + struct regmap *regmap = isl7998x->regmap;
>> + int ret;
>> +
>> + ret = regmap_register_patch(regmap, isl7998x_init_seq_1,
>> + ARRAY_SIZE(isl7998x_init_seq_1));
>> + if (ret)
>> + return ret;
>> +
>> + ret = regmap_register_patch(regmap, isl7998x_init_seq_custom,
>> + ARRAY_SIZE(isl7998x_init_seq_custom));
>> + if (ret)
>> + return ret;
>> +
>> + return regmap_register_patch(regmap, isl7998x_init_seq_2,
>> + ARRAY_SIZE(isl7998x_init_seq_2));
>> +}
>> +
>> +static int isl7998x_g_mbus_config(struct v4l2_subdev *sd,
>> + struct v4l2_mbus_config *cfg)
>
> g_mbus_configg (as well as s_mbus_config) is deprecated. Does your
> bridge driver -really- need this? What platform is that?
Yes, for iMX6 CSI2 driver, this is needed . Is there a replacement ?
>> +{
>> + struct isl7998x *isl7998x = sd_to_isl7998x(sd);
>> +
>> + cfg->type = V4L2_MBUS_CSI2_DPHY;
>> + cfg->flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
>> + if (isl7998x->nr_mipi_lanes == 1)
>> + cfg->flags |= V4L2_MBUS_CSI2_1_LANE;
>> + else
>> + cfg->flags |= V4L2_MBUS_CSI2_2_LANE;
>> +
>> + return 0;
>> +}
>> +
>> +static int isl7998x_s_stream(struct v4l2_subdev *sd, int enable)
>> +{
>> + struct isl7998x *isl7998x = sd_to_isl7998x(sd);
>> +
>> + return isl7998x_init(isl7998x);
>> +}
>> +
>> +static int isl7998x_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 >= ARRAY_SIZE(isl7998x_colour_fmts))
>> + return -EINVAL;
>> +
>> + code->code = isl7998x_colour_fmts[code->index].code;
>> + return 0;
>> +}
>> +
>> +static const unsigned int isl7998x_std_res[] = {
>> + 480, 576, 576, 480, 480, 576, 480, 480
>> +};
>> +
>> +static int isl7998x_update_std(struct isl7998x *isl7998x)
>> +{
>> + unsigned int height[ISL7998x_INPUTS];
>> + u8 scanning = GENMASK(ISL7998x_INPUTS - 1, 0);
>> + unsigned int i;
>> + int ret;
>> + u32 reg;
>> +
>> + while (true) {
>> + for (i = 0; i < ISL7998x_INPUTS; i++) {
>
> Cycle on all inputs or just the active ones?
All of them , so we would know the chip settled on some settings.
>> + ret = regmap_read(isl7998x->regmap,
>> + ISL7998x_REG_Px_DEC_SDT(i + 1), ®);
>> + if (ret)
>> + return ret;
>> +
>> + /* Detection is still in progress, restart. */
>> + if (reg & ISL7998x_REG_Px_DEC_SDT_DET) {
>> + scanning = GENMASK(ISL7998x_INPUTS - 1, 0);
>> + break;
>> + }
>> +
>> + scanning &= ~BIT(i);
>> + height[i] = isl7998x_std_res[(reg >> 4) & 0x7];
>> + }
>> +
>> + if (!scanning)
>> + break;
>> +
>> + mdelay(1);
>
> mm, seems quite an arbitrary value here. Do you have a better
> characterization in the manual, and could you use usleep_range() to
> help the scheduler to coalesce wake-ups ?
It is arbitrary.
>> + }
>> +
>> + /*
>> + * According to Renesas FAE, all input cameras must have the
>> + * same standard on this chip.
>> + */
>> + for (i = 1; i < isl7998x->nr_inputs ; i++)
>> + if (height[i - 1] != height[i])
>
> What about width? Ah seems like only 720 is accepted.
That's correct, thus far anyway.
>> + return -EINVAL;
>> +
>> + isl7998x->height = height[0];
>> +
>> + return 0;
>> +}
>> +
>> +static int isl7998x_get_fmt(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_pad_config *cfg,
>> + struct v4l2_subdev_format *format)
>> +{
>> + struct isl7998x *isl7998x = sd_to_isl7998x(sd);
>> + struct v4l2_mbus_framefmt *mf = &format->format;
>> +
>> + if (format->pad != 0)
>> + return -EINVAL;
>> +
>> + if (isl7998x->test_pattern_enabled == 1) {
>> + mf->width = 720;
>> + mf->height = 576;
>> + } else if (isl7998x->test_pattern_enabled == 2) {
>> + mf->width = 720;
>> + mf->height = 480;
>> + } else {
>> + mf->width = isl7998x->width;
>> + mf->height = isl7998x->height;
>> + }
>> +
>> + mf->code = isl7998x->fmt->code;
>> + mf->field = V4L2_FIELD_INTERLACED;
>> + mf->colorspace = 0;
>> +
>> + return 0;
>> +}
>> +
>> +static int isl7998x_set_fmt(struct v4l2_subdev *sd,
>> + struct v4l2_subdev_pad_config *cfg,
>> + struct v4l2_subdev_format *format)
>> +{
>> + struct isl7998x *isl7998x = sd_to_isl7998x(sd);
>> + struct v4l2_mbus_framefmt *mf = &format->format;
>> + int ret;
>> +
>> + if (format->pad != 0)
>> + return -EINVAL;
>> +
>> + if (format->format.width != 720 ||
>> + (format->format.height != 480 && format->format.height != 576))
>> + return -EINVAL;
>> +
>> + if (format->format.code != MEDIA_BUS_FMT_YUYV8_2X8)
>> + return -EINVAL;
>> +
>> + mf->width = format->format.width;
>> + mf->height = format->format.height;
>> + mf->code = format->format.code;
>> + mf->field = V4L2_FIELD_INTERLACED;
>> + mf->colorspace = 0;
>> +
>> + if (format->which != V4L2_SUBDEV_FORMAT_TRY) {
>
> Since you don't depend on VIDEO_V4L2_SUBDEV_API you might want to have
> a look at how other drivers handle FORMAT_TRY when V4L2_SUBDEV_API is
> not enabled. I know, it's not great :)
I added the subdev api dependency.
>> + ret = isl7998x_update_std(isl7998x);
>> + if (ret)
>> + return ret;
>> + mf->width = isl7998x->width;
>> + mf->height = isl7998x->height;
>> + isl7998x->fmt = &isl7998x_colour_fmts[0];
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int isl7998x_set_test_pattern(struct isl7998x *isl7998x)
>> +{
>> + const struct reg_sequence isl7998x_init_seq_tpg_off[] = {
>> + { ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL, 0 },
>> + { ISL7998x_REG_P5_LI_ENGINE_CTL_2, 0 }
>> + };
>> + const struct reg_sequence isl7998x_init_seq_tpg_on[] = {
>> + { ISL7998x_REG_P5_TP_GEN_BAR_PATTERN,
>> + isl7998x->test_pattern_bars << 6 },
>> + { ISL7998x_REG_P5_LI_ENGINE_CTL_2,
>> + isl7998x->test_pattern_enabled == 1 ? BIT(2) : 0 },
>> + { ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL,
>> + (isl7998x->test_pattern_chans << 4) |
>> + (isl7998x->test_pattern_color << 2) }
>> + };
>> + struct regmap *regmap = isl7998x->regmap;
>> +
>> + if (isl7998x->test_pattern_enabled) {
>> + return regmap_register_patch(regmap, isl7998x_init_seq_tpg_on,
>> + ARRAY_SIZE(isl7998x_init_seq_tpg_on));
>> + } else {
>> + return regmap_register_patch(regmap, isl7998x_init_seq_tpg_off,
>> + ARRAY_SIZE(isl7998x_init_seq_tpg_off));
>> + }
>> +}
>> +
>> +static int isl7998x_set_ctrl(struct v4l2_ctrl *ctrl)
>> +{
>> + struct isl7998x *isl7998x = container_of(ctrl->handler,
>> + struct isl7998x, ctrl_handler);
>> +
>> + switch (ctrl->id) {
>> + case V4L2_CID_TEST_PATTERN_BARS:
>> + isl7998x->test_pattern_bars = ctrl->val & 0x3;
>> + return isl7998x_set_test_pattern(isl7998x);
>> + case V4L2_CID_TEST_PATTERN_CHANNELS:
>> + isl7998x->test_pattern_chans = ctrl->val & 0xf;
>> + return isl7998x_set_test_pattern(isl7998x);
>> + case V4L2_CID_TEST_PATTERN_COLOR:
>> + isl7998x->test_pattern_color = ctrl->val & 0x3;
>> + return isl7998x_set_test_pattern(isl7998x);
>> + case V4L2_CID_TEST_PATTERN:
>> + isl7998x->test_pattern_enabled = !!ctrl->val;
>> + return isl7998x_set_test_pattern(isl7998x);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int isl7998x_get_ctrl(struct v4l2_ctrl *ctrl)
>> +{
>> + struct isl7998x *isl7998x = container_of(ctrl->handler,
>> + struct isl7998x, ctrl_handler);
>> +
>> + v4l2_info(&isl7998x->subdev, "ctrl(id:0x%x,val:0x%x) is not handled\n",
>> + ctrl->id, ctrl->val);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct v4l2_subdev_video_ops isl7998x_subdev_video_ops = {
>> + .g_mbus_config = isl7998x_g_mbus_config,
>> + .s_stream = isl7998x_s_stream,
>> +};
>> +
>> +static const struct v4l2_subdev_pad_ops isl7998x_subdev_pad_ops = {
>> + .enum_mbus_code = isl7998x_enum_mbus_code,
>
> Given the limited number of sizes you support, would you consider
> adding .enum_frame_size support?
OK
>> + .get_fmt = isl7998x_get_fmt,
>> + .set_fmt = isl7998x_set_fmt,
>> +};
>> +
>> +static const struct v4l2_subdev_ops isl7998x_subdev_ops = {
>> + .video = &isl7998x_subdev_video_ops,
>> + .pad = &isl7998x_subdev_pad_ops,
>> +};
>> +
>> +static const struct media_entity_operations isl7998x_entity_ops = {
>> + .link_validate = v4l2_subdev_link_validate,
>> +};
>> +
>> +static const struct v4l2_ctrl_ops isl7998x_ctrl_ops = {
>> + .s_ctrl = isl7998x_set_ctrl,
>> + .g_volatile_ctrl = isl7998x_get_ctrl,
>> +};
>> +
>> +static const char * const isl7998x_test_pattern_bars[] = {
>> + "bbbbwb", "bbbwwb", "bbwbwb", "bbwwwb"
>> +};
>> +
>> +static const char * const isl7998x_test_pattern_colors[] = {
>> + "Yellow", "Blue", "Green", "Pink"
>> +};
>> +
>> +static const struct v4l2_ctrl_config isl7998x_ctrls[] = {
>> + {
>> + .ops = &isl7998x_ctrl_ops,
>> + .id = V4L2_CID_TEST_PATTERN_BARS,
>> + .type = V4L2_CTRL_TYPE_MENU,
>> + .name = "Test Pattern Bars",
>> + .max = ARRAY_SIZE(isl7998x_test_pattern_bars) - 1,
>> + .def = 0,
>> + .qmenu = isl7998x_test_pattern_bars,
>> + }, {
>> + .ops = &isl7998x_ctrl_ops,
>> + .id = V4L2_CID_TEST_PATTERN_CHANNELS,
>> + .type = V4L2_CTRL_TYPE_INTEGER,
>> + .name = "Test Pattern Channels",
>> + .min = 0,
>> + .max = 0xf,
>> + .step = 1,
>> + .def = 0,
>> + .flags = 0,
>> + }, {
>> + .ops = &isl7998x_ctrl_ops,
>> + .id = V4L2_CID_TEST_PATTERN_COLOR,
>> + .type = V4L2_CTRL_TYPE_MENU,
>> + .name = "Test Pattern Color",
>> + .max = ARRAY_SIZE(isl7998x_test_pattern_colors) - 1,
>> + .def = 0,
>> + .qmenu = isl7998x_test_pattern_colors,
>> + },
>> +};
>> +
>> +#define ISL7998x_REG_DECODER_ACA_READABLE_RANGE(page)
>> \
>> + /* Decoder range */ \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_INPUT_FMT(page), \
>> + ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_ANCTL(page), \
>> + ISL7998x_REG_Px_DEC_CSC_CTL(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_BRIGHT(page), \
>> + ISL7998x_REG_Px_DEC_HUE(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_VERT_PEAK(page), \
>> + ISL7998x_REG_Px_DEC_CORING(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page), \
>> + ISL7998x_REG_Px_DEC_SDTR(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_CLMPG(page), \
>> + ISL7998x_REG_Px_DEC_DATA_CONV(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_INTERNAL_TEST(page), \
>> + ISL7998x_REG_Px_DEC_INTERNAL_TEST(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_H_DELAY_CTL(page), \
>> + ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(page)), \
>> + /* ACA range */ \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_1(page), \
>> + ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_Y_AVG(page), \
>> + ISL7998x_REG_Px_ACA_CTL_4(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(page), \
>> + ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(page), \
>> + ISL7998x_REG_Px_DEC_PAGE(page))
>> +
>> +#define ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(page)
>> \
>> + /* Decoder range */ \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_INPUT_FMT(page), \
>> + ISL7998x_REG_Px_DEC_INPUT_FMT(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page), \
>> + ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_ANCTL(page), \
>> + ISL7998x_REG_Px_DEC_CSC_CTL(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_BRIGHT(page), \
>> + ISL7998x_REG_Px_DEC_HUE(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_VERT_PEAK(page), \
>> + ISL7998x_REG_Px_DEC_CORING(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page), \
>> + ISL7998x_REG_Px_DEC_SDTR(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_CLMPG(page), \
>> + ISL7998x_REG_Px_DEC_MISC3(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_CLMD(page), \
>> + ISL7998x_REG_Px_DEC_DATA_CONV(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_INTERNAL_TEST(page), \
>> + ISL7998x_REG_Px_DEC_INTERNAL_TEST(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_H_DELAY_CTL(page), \
>> + ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(page)), \
>> + /* ACA range */ \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_1(page), \
>> + ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_2(page), \
>> + ISL7998x_REG_Px_ACA_CTL_4(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(page), \
>> + ISL7998x_REG_Px_ACA_HIST_DATA_LO(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page), \
>> + ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(page), \
>> + ISL7998x_REG_Px_DEC_PAGE(page))
>> +
>> +#define ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(page)
>> \
>> + /* Decoder range */ \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_STATUS_1(page), \
>> + ISL7998x_REG_Px_DEC_STATUS_1(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page), \
>> + ISL7998x_REG_Px_DEC_SDT(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_MVSN(page), \
>> + ISL7998x_REG_Px_DEC_HFREF(page)), \
>> + /* ACA range */ \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_Y_AVG(page), \
>> + ISL7998x_REG_Px_ACA_Y_HIGH(page)), \
>> + regmap_reg_range(ISL7998x_REG_Px_ACA_HIST_DATA_LO(page), \
>> + ISL7998x_REG_Px_ACA_FLEX_WIN_CR_CLR(page))
>> +
>> +static const struct regmap_range isl7998x_readable_ranges[] = {
>> + regmap_reg_range(ISL7998x_REG_P0_PRODUCT_ID_CODE,
>> + ISL7998x_REG_P0_IRQ_SYNC_CTL),
>> + regmap_reg_range(ISL7998x_REG_P0_INTERRUPT_STATUS,
>> + ISL7998x_REG_P0_CLOCK_DELAY),
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(0),
>> + ISL7998x_REG_Px_DEC_PAGE(0)),
>> +
>> + ISL7998x_REG_DECODER_ACA_READABLE_RANGE(1),
>> + ISL7998x_REG_DECODER_ACA_READABLE_RANGE(2),
>> + ISL7998x_REG_DECODER_ACA_READABLE_RANGE(3),
>> + ISL7998x_REG_DECODER_ACA_READABLE_RANGE(4),
>> +
>> + regmap_reg_range(ISL7998x_REG_P5_LI_ENGINE_CTL,
>> + ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL),
>> + regmap_reg_range(ISL7998x_REG_P5_FIFO_THRSH_CNT_1,
>> + ISL7998x_REG_P5_PLL_ANA),
>> + regmap_reg_range(ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1,
>> + ISL7998x_REG_P5_HIST_LINE_CNT_2),
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(5),
>> + ISL7998x_REG_Px_DEC_PAGE(5)),
>> +};
>> +
>> +static const struct regmap_range isl7998x_writeable_ranges[] = {
>> + regmap_reg_range(ISL7998x_REG_P0_SW_RESET_CTL,
>> + ISL7998x_REG_P0_IRQ_SYNC_CTL),
>> + regmap_reg_range(ISL7998x_REG_P0_CHAN_1_IRQ,
>> + ISL7998x_REG_P0_SHORT_DIAG_IRQ_EN),
>> + regmap_reg_range(ISL7998x_REG_P0_CLOCK_DELAY,
>> + ISL7998x_REG_P0_CLOCK_DELAY),
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(0),
>> + ISL7998x_REG_Px_DEC_PAGE(0)),
>> +
>> + ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(1),
>> + ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(2),
>> + ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(3),
>> + ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(4),
>> +
>> + regmap_reg_range(ISL7998x_REG_P5_LI_ENGINE_CTL,
>> + ISL7998x_REG_P5_ESC_MODE_TIME_CTL),
>> + regmap_reg_range(ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL,
>> + ISL7998x_REG_P5_PLL_ANA),
>> + regmap_reg_range(ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1,
>> + ISL7998x_REG_P5_HIST_LINE_CNT_2),
>> + regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(5),
>> + ISL7998x_REG_Px_DEC_PAGE(5)),
>> +
>> + ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(0xf),
>> +};
>> +
>> +static const struct regmap_range isl7998x_volatile_ranges[] = {
>> + regmap_reg_range(ISL7998x_REG_P0_MPP1_SYNC_CTL,
>> + ISL7998x_REG_P0_IRQ_SYNC_CTL),
>> + regmap_reg_range(ISL7998x_REG_P0_INTERRUPT_STATUS,
>> + ISL7998x_REG_P0_INTERRUPT_STATUS),
>> + regmap_reg_range(ISL7998x_REG_P0_CHAN_1_STATUS,
>> + ISL7998x_REG_P0_SHORT_DIAG_STATUS),
>> +
>> + ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(1),
>> + ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(2),
>> + ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(3),
>> + ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(4),
>> +
>> + regmap_reg_range(ISL7998x_REG_P5_AUTO_TEST_ERR_DET,
>> + ISL7998x_REG_P5_PIC_HEIGHT_LOW),
>> +};
>> +
>> +static const struct regmap_access_table isl7998x_readable_table = {
>> + .yes_ranges = isl7998x_readable_ranges,
>> + .n_yes_ranges = ARRAY_SIZE(isl7998x_readable_ranges),
>> +};
>> +
>> +static const struct regmap_access_table isl7998x_writeable_table = {
>> + .yes_ranges = isl7998x_writeable_ranges,
>> + .n_yes_ranges = ARRAY_SIZE(isl7998x_writeable_ranges),
>> +};
>> +
>> +static const struct regmap_access_table isl7998x_volatile_table = {
>> + .yes_ranges = isl7998x_volatile_ranges,
>> + .n_yes_ranges = ARRAY_SIZE(isl7998x_volatile_ranges),
>> +};
>> +
>> +static const struct regmap_range_cfg isl7998x_ranges[] = {
>> + {
>> + .range_min = ISL7998x_REG_Pn_BASE(0),
>> + .range_max = ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf),
>> + .selector_reg = ISL7998x_REG_Px_DEC_PAGE(0),
>> + .selector_mask = ISL7998x_REG_Px_DEC_PAGE_MASK,
>> + .window_start = 0,
>> + .window_len = 256,
>> + }
>> +};
>> +
>> +static const struct regmap_config isl7998x_regmap = {
>> + .reg_bits = 8,
>> + .val_bits = 8,
>> + .max_register = ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf),
>> + .ranges = isl7998x_ranges,
>> + .num_ranges = ARRAY_SIZE(isl7998x_ranges),
>> + .rd_table = &isl7998x_readable_table,
>> + .wr_table = &isl7998x_writeable_table,
>> + .volatile_table = &isl7998x_volatile_table,
>> + .cache_type = REGCACHE_RBTREE,
>> +};
>
> regmap's great, but do you really need this, as it seems to me you
> mostly write initialization tables at s_stream and init time and
> that's it.
Yes, I need it, the driver is _much_ better and cleaner than it was
without regmap. Besides, regmap gives me primitives which will be useful
later , for runtime reconfiguration.
>> +static int isl7998x_probe(struct i2c_client *client,
>> + const struct i2c_device_id *did)
>> +{
>> + struct device *dev = &client->dev;
>> + struct v4l2_fwnode_endpoint endpoint;
>> + struct device_node *ep;
>> + struct isl7998x *isl7998x;
>> + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
>> + u32 chip_id;
>> + int i, ret;
>> +
>> + ret = i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA);
>> + if (!ret) {
>> + dev_warn(&adapter->dev,
>> + "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
>> + return -EIO;
>> + }
>> +
>> + isl7998x = devm_kzalloc(dev, sizeof(*isl7998x), GFP_KERNEL);
>> + if (!isl7998x)
>> + return -ENOMEM;
>> +
>> + /* Default to all four inputs active unless specified otherwise. */
>> + ret = of_property_read_u32(dev->of_node, "isil,num-inputs",
>> + &isl7998x->nr_inputs);
>> + if (ret)
>> + isl7998x->nr_inputs = 4;
>> +
>> + if (isl7998x->nr_inputs != 1 && isl7998x->nr_inputs != 2 &&
>> + isl7998x->nr_inputs != 4) {
>> + dev_err(dev, "Invalid number of inputs selected in DT\n");
>> + return -EINVAL;
>> + }
>
> Depending on the outcome of the discussion on bindings, this might
> change to a DT parsing routine.
>
>> +
>> + isl7998x->pd_gpio = devm_gpiod_get_optional(dev, "pd", GPIOD_OUT_HIGH);
>> + if (IS_ERR(isl7998x->pd_gpio)) {
>> + dev_err(dev, "Failed to retrieve/request PD GPIO: %ld\n",
>> + PTR_ERR(isl7998x->pd_gpio));
>> + return PTR_ERR(isl7998x->pd_gpio);
>> + }
>> +
>> + isl7998x->regmap = devm_regmap_init_i2c(client, &isl7998x_regmap);
>> + if (IS_ERR(isl7998x->regmap)) {
>> + ret = PTR_ERR(isl7998x->regmap);
>> + dev_err(dev, "Failed to allocate register map: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ep = of_graph_get_next_endpoint(dev->of_node, NULL);
>> + if (!ep) {
>> + dev_err(dev, "Missing endpoint node\n");
>> + return -EINVAL;
>> + }
>> +
>> + ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &endpoint);
>> + of_node_put(ep);
>> + if (ret) {
>> + dev_err(dev, "Failed to parse endpoint\n");
>> + return ret;
>> + }
>> +
>> + if (endpoint.bus_type != V4L2_MBUS_CSI2_DPHY ||
>> + endpoint.bus.mipi_csi2.num_data_lanes == 0 ||
>> + endpoint.bus.mipi_csi2.num_data_lanes > 2) {
>> + dev_err(dev, "Invalid bus type or number of MIPI lanes\n");
>> + return -EINVAL;
>> + }
>> +
>> + isl7998x->nr_mipi_lanes = endpoint.bus.mipi_csi2.num_data_lanes;
>> +
>> + v4l2_i2c_subdev_init(&isl7998x->subdev, client, &isl7998x_subdev_ops);
>> + isl7998x->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
>
> The subdevice has a devnode in userspace, do you want to depend on
> VIDEO_V4L2_SUBDEV_API to allow userspace to control the subdevice?
Yes
>> +
>> +#ifdef CONFIG_MEDIA_CONTROLLER
>> + isl7998x->pad.flags = MEDIA_PAD_FL_SOURCE;
>
> Again, depending on the outcome of the bindings discussion, the number
> and nature of pads could change.
>
>> + isl7998x->subdev.entity.ops = &isl7998x_entity_ops;
>> + isl7998x->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
>
> Is this a sensor? I would have used IF_BRIDGE (or more appropriate
> ones if you find them) but not sensor.
Well, is this a bridge ? Between what ?
>> + ret = media_entity_pads_init(&isl7998x->subdev.entity, 1,
>> + &isl7998x->pad);
>> + if (ret < 0)
>> + return ret;
>> +#endif
>> +
>> + isl7998x->width = ISL7998x_WIDTH;
>> + isl7998x->height = ISL7998x_HEIGHT;
>> + isl7998x->fmt = &isl7998x_colour_fmts[0];
>> +
>> + ret = v4l2_ctrl_handler_init(&isl7998x->ctrl_handler,
>> + 2 + ARRAY_SIZE(isl7998x_ctrls));
>> + if (ret)
>> + return ret;
>> +
>> + mutex_init(&isl7998x->ctrl_mutex);
>> + isl7998x->ctrl_handler.lock = &isl7998x->ctrl_mutex;
>> + isl7998x->link_freq = v4l2_ctrl_new_int_menu(&isl7998x->ctrl_handler,
>> + &isl7998x_ctrl_ops, V4L2_CID_LINK_FREQ,
>> + ARRAY_SIZE(link_freq_menu_items) - 1,
>> + endpoint.bus.mipi_csi2.num_data_lanes == 2 ?
>> + 1 : 0, link_freq_menu_items);
>> + isl7998x->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
>> +
>> + for (i = 0; i < ARRAY_SIZE(isl7998x_ctrls); i++) {
>> + v4l2_ctrl_new_custom(&isl7998x->ctrl_handler,
>> + &isl7998x_ctrls[i], NULL);
>> + }
>> +
>> + v4l2_ctrl_new_std_menu_items(&isl7998x->ctrl_handler,
>> + &isl7998x_ctrl_ops, V4L2_CID_TEST_PATTERN,
>> + ARRAY_SIZE(isl7998x_test_pattern_menu) - 1,
>> + 0, 0, isl7998x_test_pattern_menu);
>> +
>
> Before registering the handler please check if ctrl_handler.error
> reports if anything has failed.
Eh ? v4l2_ctrl_new_*() will set the ctrl_handler.error ? That's weird,
shouldn't it just return an error value then ?
>> + isl7998x->subdev.ctrl_handler = &isl7998x->ctrl_handler;
>> +
>> + isl7998x->subdev.dev = dev;
>
> v4l2_i2c_subdev_init does this for you. Doesn't hurt though.
>
>> + ret = v4l2_async_register_subdev(&isl7998x->subdev);
>> + if (ret < 0)
>> + goto err_entity_cleanup;
>> +
>> + /*
>> + * Turn the chip ON and keep it ON, otherwise the camera standard
>> + * detection takes about 600 mS every time we do VIDIOC_G_FMT.
>> + */
>
> ouch. do you need to query the HW at G_FMT time? Can't you cache the
> lastly applied format and return it without having to keep the chip
> on? The same for s_fmt, if the device is powered off, cache the format
> and apply at s_stream time. Is this possible with this device?
Ideally, I would be able to switch the connected cameras at runtime and
then re-detect the standard. But I don't think the media framework has
any way to implement this and avoid the delay.
[...]
