diff options
| author | Mathis Foerst <mathis.foerst@mt.com> | 2025-07-14 09:59:27 +0200 |
|---|---|---|
| committer | Hans Verkuil <hverkuil+cisco@kernel.org> | 2025-08-25 15:40:38 +0200 |
| commit | 9db72db296c4e6bb5e901adcd557212e0ee2df26 (patch) | |
| tree | a8c75b241e74ee915df09178cd9c070e2a2c0557 | |
| parent | b541288c515d91424e74055a7b2ef344446a92f7 (diff) | |
media: mt9m114: Set pad-slew-rate
The MT9M114 supports the different slew rates (0 to 7) on the output pads.
At the moment, this is hardcoded to 7 (the fastest rate).
The user might want to change this values due to EMC requirements.
Read the 'slew-rate' from the DT and configure the pad slew rates of
the output pads accordingly in mt9m114_initialize().
Remove the hardcoded slew rate setting from the mt9m114_init table.
Signed-off-by: Mathis Foerst <mathis.foerst@mt.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
| -rw-r--r-- | drivers/media/i2c/mt9m114.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/drivers/media/i2c/mt9m114.c b/drivers/media/i2c/mt9m114.c index 54de62b46f40..21e5bb94cd0a 100644 --- a/drivers/media/i2c/mt9m114.c +++ b/drivers/media/i2c/mt9m114.c @@ -18,6 +18,7 @@ #include <linux/module.h> #include <linux/mutex.h> #include <linux/pm_runtime.h> +#include <linux/property.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/types.h> @@ -42,6 +43,9 @@ #define MT9M114_RESET_AND_MISC_CONTROL CCI_REG16(0x001a) #define MT9M114_RESET_SOC BIT(0) #define MT9M114_PAD_SLEW CCI_REG16(0x001e) +#define MT9M114_PAD_SLEW_MIN 0 +#define MT9M114_PAD_SLEW_MAX 7 +#define MT9M114_PAD_SLEW_DEFAULT 7 #define MT9M114_PAD_CONTROL CCI_REG16(0x0032) /* XDMA registers */ @@ -388,6 +392,7 @@ struct mt9m114 { unsigned int pixrate; bool streaming; + u32 pad_slew_rate; /* Pixel Array */ struct { @@ -645,9 +650,6 @@ static const struct cci_reg_sequence mt9m114_init[] = { { MT9M114_CAM_SENSOR_CFG_FINE_INTEG_TIME_MAX, 1459 }, { MT9M114_CAM_SENSOR_CFG_FINE_CORRECTION, 96 }, { MT9M114_CAM_SENSOR_CFG_REG_0_DATA, 32 }, - - /* Miscellaneous settings */ - { MT9M114_PAD_SLEW, 0x0777 }, }; /* ----------------------------------------------------------------------------- @@ -779,6 +781,13 @@ static int mt9m114_initialize(struct mt9m114 *sensor) if (ret < 0) return ret; + value = sensor->pad_slew_rate + | sensor->pad_slew_rate << 4 + | sensor->pad_slew_rate << 8; + cci_write(sensor->regmap, MT9M114_PAD_SLEW, value, &ret); + if (ret < 0) + return ret; + ret = mt9m114_set_state(sensor, MT9M114_SYS_STATE_ENTER_CONFIG_CHANGE); if (ret < 0) return ret; @@ -2382,6 +2391,17 @@ static int mt9m114_parse_dt(struct mt9m114 *sensor) goto error; } + sensor->pad_slew_rate = MT9M114_PAD_SLEW_DEFAULT; + device_property_read_u32(&sensor->client->dev, "slew-rate", + &sensor->pad_slew_rate); + + if (sensor->pad_slew_rate < MT9M114_PAD_SLEW_MIN || + sensor->pad_slew_rate > MT9M114_PAD_SLEW_MAX) { + dev_err(&sensor->client->dev, "Invalid slew-rate %u\n", + sensor->pad_slew_rate); + return -EINVAL; + } + return 0; error: |