From 73dcffeb2ff98e8181b43e9d9faad042ddcb7f60 Mon Sep 17 00:00:00 2001 From: Daniel Scally Date: Tue, 23 Nov 2021 01:00:06 +0100 Subject: [PATCH] media: i2c: Support 19.2MHz input clock in ov8865 The ov8865 driver as written expects a 24MHz input clock, but the sensor is sometimes found on x86 platforms with a 19.2MHz input clock supplied. Add a set of PLL configurations to the driver to support that rate too. As ACPI doesn't auto-configure the clock rate, check for a clock-frequency during probe and set that rate if one is found. Signed-off-by: Daniel Scally Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/ov8865.c | 195 +++++++++++++++++++++++++++---------- 1 file changed, 143 insertions(+), 52 deletions(-) diff --git a/drivers/media/i2c/ov8865.c b/drivers/media/i2c/ov8865.c index 68fdb1ce1e94..e52e43bd7787 100644 --- a/drivers/media/i2c/ov8865.c +++ b/drivers/media/i2c/ov8865.c @@ -21,10 +21,6 @@ #include #include -/* Clock rate */ - -#define OV8865_EXTCLK_RATE 24000000 - /* Register definitions */ /* System */ @@ -567,6 +563,25 @@ struct ov8865_sclk_config { unsigned int sclk_div; }; +struct ov8865_pll_configs { + const struct ov8865_pll1_config *pll1_config; + const struct ov8865_pll2_config *pll2_config_native; + const struct ov8865_pll2_config *pll2_config_binning; +}; + +/* Clock rate */ + +enum extclk_rate { + OV8865_19_2_MHZ, + OV8865_24_MHZ, + OV8865_NUM_SUPPORTED_RATES +}; + +static const unsigned long supported_extclk_rates[] = { + [OV8865_19_2_MHZ] = 19200000, + [OV8865_24_MHZ] = 24000000, +}; + /* * General formulas for (array-centered) mode calculation: * - photo_array_width = 3296 @@ -635,9 +650,7 @@ struct ov8865_mode { struct v4l2_fract frame_interval; - const struct ov8865_pll1_config *pll1_config; - const struct ov8865_pll2_config *pll2_config; - const struct ov8865_sclk_config *sclk_config; + bool pll2_binning; const struct ov8865_register_value *register_values; unsigned int register_values_count; @@ -665,6 +678,9 @@ struct ov8865_sensor { struct regulator *avdd; struct regulator *dvdd; struct regulator *dovdd; + + unsigned long extclk_rate; + const struct ov8865_pll_configs *pll_configs; struct clk *extclk; struct v4l2_fwnode_endpoint endpoint; @@ -680,43 +696,70 @@ struct ov8865_sensor { /* Static definitions */ /* - * EXTCLK = 24 MHz * PHY_SCLK = 720 MHz * MIPI_PCLK = 90 MHz */ -static const struct ov8865_pll1_config ov8865_pll1_config_native = { - .pll_pre_div_half = 1, - .pll_pre_div = 0, - .pll_mul = 30, - .m_div = 1, - .mipi_div = 3, - .pclk_div = 1, - .sys_pre_div = 1, - .sys_div = 2, + +static const struct ov8865_pll1_config ov8865_pll1_config_native_19_2mhz = { + .pll_pre_div_half = 1, + .pll_pre_div = 2, + .pll_mul = 75, + .m_div = 1, + .mipi_div = 3, + .pclk_div = 1, + .sys_pre_div = 1, + .sys_div = 2, +}; + +static const struct ov8865_pll1_config ov8865_pll1_config_native_24mhz = { + .pll_pre_div_half = 1, + .pll_pre_div = 0, + .pll_mul = 30, + .m_div = 1, + .mipi_div = 3, + .pclk_div = 1, + .sys_pre_div = 1, + .sys_div = 2, }; /* - * EXTCLK = 24 MHz * DAC_CLK = 360 MHz * SCLK = 144 MHz */ -static const struct ov8865_pll2_config ov8865_pll2_config_native = { - .pll_pre_div_half = 1, - .pll_pre_div = 0, - .pll_mul = 30, - .dac_div = 2, - .sys_pre_div = 5, - .sys_div = 0, +static const struct ov8865_pll2_config ov8865_pll2_config_native_19_2mhz = { + .pll_pre_div_half = 1, + .pll_pre_div = 5, + .pll_mul = 75, + .dac_div = 1, + .sys_pre_div = 1, + .sys_div = 3, +}; + +static const struct ov8865_pll2_config ov8865_pll2_config_native_24mhz = { + .pll_pre_div_half = 1, + .pll_pre_div = 0, + .pll_mul = 30, + .dac_div = 2, + .sys_pre_div = 5, + .sys_div = 0, }; /* - * EXTCLK = 24 MHz * DAC_CLK = 360 MHz * SCLK = 72 MHz */ -static const struct ov8865_pll2_config ov8865_pll2_config_binning = { +static const struct ov8865_pll2_config ov8865_pll2_config_binning_19_2mhz = { + .pll_pre_div_half = 1, + .pll_pre_div = 2, + .pll_mul = 75, + .dac_div = 2, + .sys_pre_div = 10, + .sys_div = 0, +}; + +static const struct ov8865_pll2_config ov8865_pll2_config_binning_24mhz = { .pll_pre_div_half = 1, .pll_pre_div = 0, .pll_mul = 30, @@ -725,6 +768,23 @@ static const struct ov8865_pll2_config ov8865_pll2_config_binning = { .sys_div = 0, }; +static const struct ov8865_pll_configs ov8865_pll_configs_19_2mhz = { + .pll1_config = &ov8865_pll1_config_native_19_2mhz, + .pll2_config_native = &ov8865_pll2_config_native_19_2mhz, + .pll2_config_binning = &ov8865_pll2_config_binning_19_2mhz, +}; + +static const struct ov8865_pll_configs ov8865_pll_configs_24mhz = { + .pll1_config = &ov8865_pll1_config_native_24mhz, + .pll2_config_native = &ov8865_pll2_config_native_24mhz, + .pll2_config_binning = &ov8865_pll2_config_binning_24mhz, +}; + +static const struct ov8865_pll_configs *ov8865_pll_configs[] = { + &ov8865_pll_configs_19_2mhz, + &ov8865_pll_configs_24mhz, +}; + static const struct ov8865_sclk_config ov8865_sclk_config_native = { .sys_sel = 1, .sclk_sel = 0, @@ -934,9 +994,7 @@ static const struct ov8865_mode ov8865_modes[] = { .frame_interval = { 1, 30 }, /* PLL */ - .pll1_config = &ov8865_pll1_config_native, - .pll2_config = &ov8865_pll2_config_native, - .sclk_config = &ov8865_sclk_config_native, + .pll2_binning = false, /* Registers */ .register_values = ov8865_register_values_native, @@ -990,9 +1048,7 @@ static const struct ov8865_mode ov8865_modes[] = { .frame_interval = { 1, 30 }, /* PLL */ - .pll1_config = &ov8865_pll1_config_native, - .pll2_config = &ov8865_pll2_config_native, - .sclk_config = &ov8865_sclk_config_native, + .pll2_binning = false, /* Registers */ .register_values = ov8865_register_values_native, @@ -1050,9 +1106,7 @@ static const struct ov8865_mode ov8865_modes[] = { .frame_interval = { 1, 30 }, /* PLL */ - .pll1_config = &ov8865_pll1_config_native, - .pll2_config = &ov8865_pll2_config_binning, - .sclk_config = &ov8865_sclk_config_native, + .pll2_binning = true, /* Registers */ .register_values = ov8865_register_values_binning, @@ -1116,9 +1170,7 @@ static const struct ov8865_mode ov8865_modes[] = { .frame_interval = { 1, 90 }, /* PLL */ - .pll1_config = &ov8865_pll1_config_native, - .pll2_config = &ov8865_pll2_config_binning, - .sclk_config = &ov8865_sclk_config_native, + .pll2_binning = true, /* Registers */ .register_values = ov8865_register_values_binning, @@ -1513,12 +1565,11 @@ static int ov8865_isp_configure(struct ov8865_sensor *sensor) static unsigned long ov8865_mode_pll1_rate(struct ov8865_sensor *sensor, const struct ov8865_mode *mode) { - const struct ov8865_pll1_config *config = mode->pll1_config; - unsigned long extclk_rate; + const struct ov8865_pll1_config *config; unsigned long pll1_rate; - extclk_rate = clk_get_rate(sensor->extclk); - pll1_rate = extclk_rate * config->pll_mul / config->pll_pre_div_half; + config = sensor->pll_configs->pll1_config; + pll1_rate = sensor->extclk_rate * config->pll_mul / config->pll_pre_div_half; switch (config->pll_pre_div) { case 0: @@ -1552,10 +1603,12 @@ static int ov8865_mode_pll1_configure(struct ov8865_sensor *sensor, const struct ov8865_mode *mode, u32 mbus_code) { - const struct ov8865_pll1_config *config = mode->pll1_config; + const struct ov8865_pll1_config *config; u8 value; int ret; + config = sensor->pll_configs->pll1_config; + switch (mbus_code) { case MEDIA_BUS_FMT_SBGGR10_1X10: value = OV8865_MIPI_BIT_SEL(10); @@ -1622,9 +1675,12 @@ static int ov8865_mode_pll1_configure(struct ov8865_sensor *sensor, static int ov8865_mode_pll2_configure(struct ov8865_sensor *sensor, const struct ov8865_mode *mode) { - const struct ov8865_pll2_config *config = mode->pll2_config; + const struct ov8865_pll2_config *config; int ret; + config = mode->pll2_binning ? sensor->pll_configs->pll2_config_binning : + sensor->pll_configs->pll2_config_native; + ret = ov8865_write(sensor, OV8865_PLL_CTRL12_REG, OV8865_PLL_CTRL12_PRE_DIV_HALF(config->pll_pre_div_half) | OV8865_PLL_CTRL12_DAC_DIV(config->dac_div)); @@ -1658,7 +1714,7 @@ static int ov8865_mode_pll2_configure(struct ov8865_sensor *sensor, static int ov8865_mode_sclk_configure(struct ov8865_sensor *sensor, const struct ov8865_mode *mode) { - const struct ov8865_sclk_config *config = mode->sclk_config; + const struct ov8865_sclk_config *config = &ov8865_sclk_config_native; int ret; ret = ov8865_write(sensor, OV8865_CLK_SEL0_REG, @@ -2053,9 +2109,11 @@ static int ov8865_mode_configure(struct ov8865_sensor *sensor, static unsigned long ov8865_mode_mipi_clk_rate(struct ov8865_sensor *sensor, const struct ov8865_mode *mode) { - const struct ov8865_pll1_config *config = mode->pll1_config; + const struct ov8865_pll1_config *config; unsigned long pll1_rate; + config = sensor->pll_configs->pll1_config; + pll1_rate = ov8865_mode_pll1_rate(sensor, mode); return pll1_rate / config->m_div / 2; @@ -2783,7 +2841,8 @@ static int ov8865_probe(struct i2c_client *client) struct ov8865_sensor *sensor; struct v4l2_subdev *subdev; struct media_pad *pad; - unsigned long rate; + unsigned int rate = 0; + unsigned int i; int ret; sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); @@ -2852,19 +2911,51 @@ static int ov8865_probe(struct i2c_client *client) /* External Clock */ sensor->extclk = devm_clk_get(dev, NULL); - if (IS_ERR(sensor->extclk)) { + if (PTR_ERR(sensor->extclk) == -ENOENT) { + dev_info(dev, "no external clock found, continuing...\n"); + sensor->extclk = NULL; + } else if (IS_ERR(sensor->extclk)) { dev_err(dev, "failed to get external clock\n"); ret = PTR_ERR(sensor->extclk); goto error_endpoint; } - rate = clk_get_rate(sensor->extclk); - if (rate != OV8865_EXTCLK_RATE) { - dev_err(dev, "clock rate %lu Hz is unsupported\n", rate); + /* + * We could have either a 24MHz or 19.2MHz clock rate from either dt or + * ACPI...but we also need to support the weird IPU3 case which will + * have an external clock AND a clock-frequency property. Check for the + * clock-frequency property and if found, set that rate if we managed + * to acquire a clock. This should cover the ACPI case. If the system + * uses devicetree then the configured rate should already be set, so + * we can just read it. + */ + ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency", + &rate); + if (!ret && sensor->extclk) { + ret = clk_set_rate(sensor->extclk, rate); + if (ret) + return dev_err_probe(dev, ret, + "failed to set clock rate\n"); + } else if (ret && !sensor->extclk) { + return dev_err_probe(dev, ret, "invalid clock config\n"); + } + + sensor->extclk_rate = rate ? rate : clk_get_rate(sensor->extclk); + + for (i = 0; i < ARRAY_SIZE(supported_extclk_rates); i++) { + if (sensor->extclk_rate == supported_extclk_rates[i]) + break; + } + + if (i == ARRAY_SIZE(supported_extclk_rates)) { + dev_err(dev, "clock rate %lu Hz is unsupported\n", + sensor->extclk_rate); ret = -EINVAL; goto error_endpoint; } + sensor->pll_configs = ov8865_pll_configs[i]; + /* Subdev, entity and pad */ subdev = &sensor->subdev;