| Message ID | 20200923152129.21736-4-krzk@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4,1/4] dt-bindings: media: imx258: add bindings for IMX258 sensor | expand |
Hi Krzysztof, On Wed, Sep 23, 2020 at 05:21:29PM +0200, Krzysztof Kozlowski wrote: > The IMX258 sensor driver checked in device properties for a > clock-frequency property which actually does not mean that the clock is > really running such frequency or is it even enabled. > > Get the provided clock and check it frequency. If none is provided, > fall back to old property. > > Enable the clock when accessing the IMX258 registers and when streaming > starts with runtime PM. > > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> > > --- > > Changes since v3: > 1. None > > Changes since v2: > 1. Do not try to set drvdata, wrap lines. > 2. Use dev_dbg. > > Changes since v1: > 1. Use runtime PM for clock toggling > --- > drivers/media/i2c/imx258.c | 71 +++++++++++++++++++++++++++++++++----- > 1 file changed, 62 insertions(+), 9 deletions(-) > > diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c > index ae183b0dbba9..7bedbfe5c4d6 100644 > --- a/drivers/media/i2c/imx258.c > +++ b/drivers/media/i2c/imx258.c > @@ -2,6 +2,7 @@ > // Copyright (C) 2018 Intel Corporation > > #include <linux/acpi.h> > +#include <linux/clk.h> > #include <linux/delay.h> > #include <linux/i2c.h> > #include <linux/module.h> > @@ -68,6 +69,9 @@ > #define REG_CONFIG_MIRROR_FLIP 0x03 > #define REG_CONFIG_FLIP_TEST_PATTERN 0x02 > > +/* Input clock frequency in Hz */ > +#define IMX258_INPUT_CLOCK_FREQ 19200000 > + > struct imx258_reg { > u16 address; > u8 val; > @@ -610,6 +614,8 @@ struct imx258 { > > /* Streaming on/off */ > bool streaming; > + > + struct clk *clk; > }; > > static inline struct imx258 *to_imx258(struct v4l2_subdev *_sd) > @@ -972,6 +978,29 @@ static int imx258_stop_streaming(struct imx258 *imx258) > return 0; > } > > +static int imx258_power_on(struct device *dev) > +{ > + struct v4l2_subdev *sd = dev_get_drvdata(dev); > + struct imx258 *imx258 = to_imx258(sd); > + int ret; > + > + ret = clk_prepare_enable(imx258->clk); > + if (ret) > + dev_err(dev, "failed to enable clock\n"); > + > + return ret; > +} > + > +static int imx258_power_off(struct device *dev) > +{ > + struct v4l2_subdev *sd = dev_get_drvdata(dev); > + struct imx258 *imx258 = to_imx258(sd); > + > + clk_disable_unprepare(imx258->clk); > + > + return 0; > +} > + > static int imx258_set_stream(struct v4l2_subdev *sd, int enable) > { > struct imx258 *imx258 = to_imx258(sd); > @@ -1199,9 +1228,28 @@ static int imx258_probe(struct i2c_client *client) > int ret; > u32 val = 0; > > - device_property_read_u32(&client->dev, "clock-frequency", &val); > - if (val != 19200000) > - return -EINVAL; > + imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL); > + if (!imx258) > + return -ENOMEM; > + > + imx258->clk = devm_clk_get_optional(&client->dev, NULL); > + if (!imx258->clk) { > + dev_dbg(&client->dev, > + "no clock provided, using clock-frequency property\n"); > + > + device_property_read_u32(&client->dev, "clock-frequency", &val); > + if (val != IMX258_INPUT_CLOCK_FREQ) > + return -EINVAL; > + } else if (IS_ERR(imx258->clk)) { > + return dev_err_probe(&client->dev, PTR_ERR(imx258->clk), > + "error getting clock\n"); > + } else { > + if (clk_get_rate(imx258->clk) != IMX258_INPUT_CLOCK_FREQ) { > + dev_err(&client->dev, > + "input clock frequency not supported\n"); > + return -EINVAL; > + } > + } > > /* > * Check that the device is mounted upside down. The driver only > @@ -1211,24 +1259,25 @@ static int imx258_probe(struct i2c_client *client) > if (ret || val != 180) > return -EINVAL; > > - imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL); > - if (!imx258) > - return -ENOMEM; > - > /* Initialize subdev */ > v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops); > > + /* Will be powered off via pm_runtime_idle */ > + ret = imx258_power_on(&client->dev); > + if (ret) > + return ret; > + > /* Check module identity */ > ret = imx258_identify_module(imx258); > if (ret) > - return ret; > + goto error_identify; > > /* Set default mode to max resolution */ > imx258->cur_mode = &supported_modes[0]; > > ret = imx258_init_controls(imx258); > if (ret) > - return ret; > + goto error_identify; > > /* Initialize subdev */ > imx258->sd.internal_ops = &imx258_internal_ops; > @@ -1258,6 +1307,9 @@ static int imx258_probe(struct i2c_client *client) > error_handler_free: > imx258_free_controls(imx258); > > +error_identify: > + imx258_power_off(&client->dev); You'll need this in remove callback, too. > + > return ret; > } > > @@ -1278,6 +1330,7 @@ static int imx258_remove(struct i2c_client *client) > > static const struct dev_pm_ops imx258_pm_ops = { > SET_SYSTEM_SLEEP_PM_OPS(imx258_suspend, imx258_resume) > + SET_RUNTIME_PM_OPS(imx258_power_off, imx258_power_on, NULL) > }; > > #ifdef CONFIG_ACPI
On Tue, Sep 29, 2020 at 12:17:04PM +0300, Sakari Ailus wrote: > Hi Krzysztof, > > On Wed, Sep 23, 2020 at 05:21:29PM +0200, Krzysztof Kozlowski wrote: > > The IMX258 sensor driver checked in device properties for a > > clock-frequency property which actually does not mean that the clock is > > really running such frequency or is it even enabled. > > > > Get the provided clock and check it frequency. If none is provided, > > fall back to old property. > > > > Enable the clock when accessing the IMX258 registers and when streaming > > starts with runtime PM. > > > > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> > > > > --- > > > > Changes since v3: > > 1. None > > > > Changes since v2: > > 1. Do not try to set drvdata, wrap lines. > > 2. Use dev_dbg. > > > > Changes since v1: > > 1. Use runtime PM for clock toggling > > --- > > drivers/media/i2c/imx258.c | 71 +++++++++++++++++++++++++++++++++----- > > 1 file changed, 62 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c > > index ae183b0dbba9..7bedbfe5c4d6 100644 > > --- a/drivers/media/i2c/imx258.c > > +++ b/drivers/media/i2c/imx258.c > > @@ -2,6 +2,7 @@ > > // Copyright (C) 2018 Intel Corporation > > > > #include <linux/acpi.h> > > +#include <linux/clk.h> > > #include <linux/delay.h> > > #include <linux/i2c.h> > > #include <linux/module.h> > > @@ -68,6 +69,9 @@ > > #define REG_CONFIG_MIRROR_FLIP 0x03 > > #define REG_CONFIG_FLIP_TEST_PATTERN 0x02 > > > > +/* Input clock frequency in Hz */ > > +#define IMX258_INPUT_CLOCK_FREQ 19200000 > > + > > struct imx258_reg { > > u16 address; > > u8 val; > > @@ -610,6 +614,8 @@ struct imx258 { > > > > /* Streaming on/off */ > > bool streaming; > > + > > + struct clk *clk; > > }; > > > > static inline struct imx258 *to_imx258(struct v4l2_subdev *_sd) > > @@ -972,6 +978,29 @@ static int imx258_stop_streaming(struct imx258 *imx258) > > return 0; > > } > > > > +static int imx258_power_on(struct device *dev) > > +{ > > + struct v4l2_subdev *sd = dev_get_drvdata(dev); > > + struct imx258 *imx258 = to_imx258(sd); > > + int ret; > > + > > + ret = clk_prepare_enable(imx258->clk); > > + if (ret) > > + dev_err(dev, "failed to enable clock\n"); > > + > > + return ret; > > +} > > + > > +static int imx258_power_off(struct device *dev) > > +{ > > + struct v4l2_subdev *sd = dev_get_drvdata(dev); > > + struct imx258 *imx258 = to_imx258(sd); > > + > > + clk_disable_unprepare(imx258->clk); > > + > > + return 0; > > +} > > + > > static int imx258_set_stream(struct v4l2_subdev *sd, int enable) > > { > > struct imx258 *imx258 = to_imx258(sd); > > @@ -1199,9 +1228,28 @@ static int imx258_probe(struct i2c_client *client) > > int ret; > > u32 val = 0; > > > > - device_property_read_u32(&client->dev, "clock-frequency", &val); > > - if (val != 19200000) > > - return -EINVAL; > > + imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL); > > + if (!imx258) > > + return -ENOMEM; > > + > > + imx258->clk = devm_clk_get_optional(&client->dev, NULL); > > + if (!imx258->clk) { > > + dev_dbg(&client->dev, > > + "no clock provided, using clock-frequency property\n"); > > + > > + device_property_read_u32(&client->dev, "clock-frequency", &val); > > + if (val != IMX258_INPUT_CLOCK_FREQ) > > + return -EINVAL; > > + } else if (IS_ERR(imx258->clk)) { > > + return dev_err_probe(&client->dev, PTR_ERR(imx258->clk), > > + "error getting clock\n"); > > + } else { > > + if (clk_get_rate(imx258->clk) != IMX258_INPUT_CLOCK_FREQ) { > > + dev_err(&client->dev, > > + "input clock frequency not supported\n"); > > + return -EINVAL; > > + } > > + } > > > > /* > > * Check that the device is mounted upside down. The driver only > > @@ -1211,24 +1259,25 @@ static int imx258_probe(struct i2c_client *client) > > if (ret || val != 180) > > return -EINVAL; > > > > - imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL); > > - if (!imx258) > > - return -ENOMEM; > > - > > /* Initialize subdev */ > > v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops); > > > > + /* Will be powered off via pm_runtime_idle */ > > + ret = imx258_power_on(&client->dev); > > + if (ret) > > + return ret; > > + > > /* Check module identity */ > > ret = imx258_identify_module(imx258); > > if (ret) > > - return ret; > > + goto error_identify; > > > > /* Set default mode to max resolution */ > > imx258->cur_mode = &supported_modes[0]; > > > > ret = imx258_init_controls(imx258); > > if (ret) > > - return ret; > > + goto error_identify; > > > > /* Initialize subdev */ > > imx258->sd.internal_ops = &imx258_internal_ops; > > @@ -1258,6 +1307,9 @@ static int imx258_probe(struct i2c_client *client) > > error_handler_free: > > imx258_free_controls(imx258); > > > > +error_identify: > > + imx258_power_off(&client->dev); > > You'll need this in remove callback, too. True, there is no runtime idle call so this is missing. Thanks. Best regards, Krzysztof
diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c index ae183b0dbba9..7bedbfe5c4d6 100644 --- a/drivers/media/i2c/imx258.c +++ b/drivers/media/i2c/imx258.c @@ -2,6 +2,7 @@ // Copyright (C) 2018 Intel Corporation #include <linux/acpi.h> +#include <linux/clk.h> #include <linux/delay.h> #include <linux/i2c.h> #include <linux/module.h> @@ -68,6 +69,9 @@ #define REG_CONFIG_MIRROR_FLIP 0x03 #define REG_CONFIG_FLIP_TEST_PATTERN 0x02 +/* Input clock frequency in Hz */ +#define IMX258_INPUT_CLOCK_FREQ 19200000 + struct imx258_reg { u16 address; u8 val; @@ -610,6 +614,8 @@ struct imx258 { /* Streaming on/off */ bool streaming; + + struct clk *clk; }; static inline struct imx258 *to_imx258(struct v4l2_subdev *_sd) @@ -972,6 +978,29 @@ static int imx258_stop_streaming(struct imx258 *imx258) return 0; } +static int imx258_power_on(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct imx258 *imx258 = to_imx258(sd); + int ret; + + ret = clk_prepare_enable(imx258->clk); + if (ret) + dev_err(dev, "failed to enable clock\n"); + + return ret; +} + +static int imx258_power_off(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct imx258 *imx258 = to_imx258(sd); + + clk_disable_unprepare(imx258->clk); + + return 0; +} + static int imx258_set_stream(struct v4l2_subdev *sd, int enable) { struct imx258 *imx258 = to_imx258(sd); @@ -1199,9 +1228,28 @@ static int imx258_probe(struct i2c_client *client) int ret; u32 val = 0; - device_property_read_u32(&client->dev, "clock-frequency", &val); - if (val != 19200000) - return -EINVAL; + imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL); + if (!imx258) + return -ENOMEM; + + imx258->clk = devm_clk_get_optional(&client->dev, NULL); + if (!imx258->clk) { + dev_dbg(&client->dev, + "no clock provided, using clock-frequency property\n"); + + device_property_read_u32(&client->dev, "clock-frequency", &val); + if (val != IMX258_INPUT_CLOCK_FREQ) + return -EINVAL; + } else if (IS_ERR(imx258->clk)) { + return dev_err_probe(&client->dev, PTR_ERR(imx258->clk), + "error getting clock\n"); + } else { + if (clk_get_rate(imx258->clk) != IMX258_INPUT_CLOCK_FREQ) { + dev_err(&client->dev, + "input clock frequency not supported\n"); + return -EINVAL; + } + } /* * Check that the device is mounted upside down. The driver only @@ -1211,24 +1259,25 @@ static int imx258_probe(struct i2c_client *client) if (ret || val != 180) return -EINVAL; - imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL); - if (!imx258) - return -ENOMEM; - /* Initialize subdev */ v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops); + /* Will be powered off via pm_runtime_idle */ + ret = imx258_power_on(&client->dev); + if (ret) + return ret; + /* Check module identity */ ret = imx258_identify_module(imx258); if (ret) - return ret; + goto error_identify; /* Set default mode to max resolution */ imx258->cur_mode = &supported_modes[0]; ret = imx258_init_controls(imx258); if (ret) - return ret; + goto error_identify; /* Initialize subdev */ imx258->sd.internal_ops = &imx258_internal_ops; @@ -1258,6 +1307,9 @@ static int imx258_probe(struct i2c_client *client) error_handler_free: imx258_free_controls(imx258); +error_identify: + imx258_power_off(&client->dev); + return ret; } @@ -1278,6 +1330,7 @@ static int imx258_remove(struct i2c_client *client) static const struct dev_pm_ops imx258_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(imx258_suspend, imx258_resume) + SET_RUNTIME_PM_OPS(imx258_power_off, imx258_power_on, NULL) }; #ifdef CONFIG_ACPI
The IMX258 sensor driver checked in device properties for a clock-frequency property which actually does not mean that the clock is really running such frequency or is it even enabled. Get the provided clock and check it frequency. If none is provided, fall back to old property. Enable the clock when accessing the IMX258 registers and when streaming starts with runtime PM. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> --- Changes since v3: 1. None Changes since v2: 1. Do not try to set drvdata, wrap lines. 2. Use dev_dbg. Changes since v1: 1. Use runtime PM for clock toggling --- drivers/media/i2c/imx258.c | 71 +++++++++++++++++++++++++++++++++----- 1 file changed, 62 insertions(+), 9 deletions(-)