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[86.13.91.161]) by smtp.gmail.com with ESMTPSA id v12sm20437957wrq.59.2021.08.09.15.59.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Aug 2021 15:59:01 -0700 (PDT) From: Daniel Scally To: djrscally@gmail.com, sakari.ailus@linux.intel.com, paul.kocialkowski@bootlin.com, ezequiel@collabora.com, hverkuil-cisco@xs4all.nl, linux-media@vger.kernel.org Cc: yong.zhi@intel.com, bingbu.cao@intel.com, tian.shu.qiu@intel.com, kevin.lhopital@bootlin.com, yang.lee@linux.alibaba.com, andy.shevchenko@gmail.com, laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Subject: [PATCH v2 04/12] media: i2c: Support 19.2MHz input clock in ov8865 Date: Mon, 9 Aug 2021 23:58:37 +0100 Message-Id: <20210809225845.916430-5-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210809225845.916430-1-djrscally@gmail.com> References: <20210809225845.916430-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org 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 --- Changes in v2: - Added an enum defining the possible frequency rates to index the array (Andy) drivers/media/i2c/ov8865.c | 164 +++++++++++++++++++++++++++---------- 1 file changed, 121 insertions(+), 43 deletions(-) diff --git a/drivers/media/i2c/ov8865.c b/drivers/media/i2c/ov8865.c index fe700787bfb9..1382b16d1a09 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 +563,19 @@ struct ov8865_sclk_config { unsigned int sclk_div; }; +/* 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 @@ -665,6 +674,9 @@ struct ov8865_sensor { struct regulator *avdd; struct regulator *dvdd; struct regulator *dovdd; + + unsigned long extclk_rate; + enum extclk_rate extclk_rate_idx; struct clk *extclk; struct v4l2_fwnode_endpoint endpoint; @@ -680,49 +692,83 @@ 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_configs_native[] = { + { /* 19.2 MHz input clock */ + .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, + }, + { /* 24MHz input clock */ + .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_configs_native[] = { + /* 19.2MHz input clock */ + { + .pll_pre_div_half = 1, + .pll_pre_div = 5, + .pll_mul = 75, + .dac_div = 1, + .sys_pre_div = 1, + .sys_div = 3, + }, + /* 24MHz input clock */ + { + .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_configs_binning[] = { + /* 19.2MHz input clock */ + { + .pll_pre_div_half = 1, + .pll_pre_div = 2, + .pll_mul = 75, + .dac_div = 2, + .sys_pre_div = 10, + .sys_div = 0, + }, + /* 24MHz input clock */ + { .pll_pre_div_half = 1, .pll_pre_div = 0, .pll_mul = 30, .dac_div = 2, .sys_pre_div = 10, .sys_div = 0, + } }; static const struct ov8865_sclk_config ov8865_sclk_config_native = { @@ -934,8 +980,8 @@ static const struct ov8865_mode ov8865_modes[] = { .frame_interval = { 1, 30 }, /* PLL */ - .pll1_config = &ov8865_pll1_config_native, - .pll2_config = &ov8865_pll2_config_native, + .pll1_config = ov8865_pll1_configs_native, + .pll2_config = ov8865_pll2_configs_native, .sclk_config = &ov8865_sclk_config_native, /* Registers */ @@ -990,8 +1036,8 @@ static const struct ov8865_mode ov8865_modes[] = { .frame_interval = { 1, 30 }, /* PLL */ - .pll1_config = &ov8865_pll1_config_native, - .pll2_config = &ov8865_pll2_config_native, + .pll1_config = ov8865_pll1_configs_native, + .pll2_config = ov8865_pll2_configs_native, .sclk_config = &ov8865_sclk_config_native, /* Registers */ @@ -1050,8 +1096,8 @@ static const struct ov8865_mode ov8865_modes[] = { .frame_interval = { 1, 30 }, /* PLL */ - .pll1_config = &ov8865_pll1_config_native, - .pll2_config = &ov8865_pll2_config_binning, + .pll1_config = ov8865_pll1_configs_native, + .pll2_config = ov8865_pll2_configs_binning, .sclk_config = &ov8865_sclk_config_native, /* Registers */ @@ -1116,8 +1162,8 @@ static const struct ov8865_mode ov8865_modes[] = { .frame_interval = { 1, 90 }, /* PLL */ - .pll1_config = &ov8865_pll1_config_native, - .pll2_config = &ov8865_pll2_config_binning, + .pll1_config = ov8865_pll1_configs_native, + .pll2_config = ov8865_pll2_configs_binning, .sclk_config = &ov8865_sclk_config_native, /* Registers */ @@ -1513,12 +1559,11 @@ 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 = &mode->pll1_config[sensor->extclk_rate_idx]; + pll1_rate = sensor->extclk_rate * config->pll_mul / config->pll_pre_div_half; switch (config->pll_pre_div) { case 0: @@ -1552,10 +1597,12 @@ 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 = &mode->pll1_config[sensor->extclk_rate_idx]; + switch (mbus_code) { case MEDIA_BUS_FMT_SBGGR10_1X10: value = OV8865_MIPI_BIT_SEL(10); @@ -1622,9 +1669,11 @@ 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_config[sensor->extclk_rate_idx]; + 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)); @@ -2053,9 +2102,11 @@ 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 = &mode->pll1_config[sensor->extclk_rate_idx]; + pll1_rate = ov8865_mode_pll1_rate(sensor, mode); return pll1_rate / config->m_div / 2; @@ -2783,7 +2834,8 @@ 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; + unsigned int i; int ret; sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); @@ -2858,13 +2910,39 @@ static int ov8865_probe(struct i2c_client *client) 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. Check for a + * clock-frequency property and if found, set that rate. This should + * cover ACPI case. If the system uses devicetree then the configured + * rate should already be set, so we'll have to check it. + */ + + ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency", + &rate); + if (!ret) { + ret = clk_set_rate(sensor->extclk, rate); + if (ret) { + dev_err(dev, "failed to set clock rate\n"); + return ret; + } + } + + sensor->extclk_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->extclk_rate_idx = i; + /* Subdev, entity and pad */ subdev = &sensor->subdev;