diff options
Diffstat (limited to 'drivers/iio/adc/imx93_adc.c')
| -rw-r--r-- | drivers/iio/adc/imx93_adc.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/drivers/iio/adc/imx93_adc.c b/drivers/iio/adc/imx93_adc.c index 7feaafd2316f..787e80db5de3 100644 --- a/drivers/iio/adc/imx93_adc.c +++ b/drivers/iio/adc/imx93_adc.c @@ -32,12 +32,13 @@ #define IMX93_ADC_PCDR0 0x100 #define IMX93_ADC_PCDR1 0x104 #define IMX93_ADC_PCDR2 0x108 -#define IMX93_ADC_PCDR3 0x10c +#define IMX93_ADC_PCDR3 0x10C #define IMX93_ADC_PCDR4 0x110 #define IMX93_ADC_PCDR5 0x114 #define IMX93_ADC_PCDR6 0x118 -#define IMX93_ADC_PCDR7 0x11c +#define IMX93_ADC_PCDR7 0x11C #define IMX93_ADC_CALSTAT 0x39C +#define IMX93_ADC_CALCFG0 0x3A0 /* ADC bit shift */ #define IMX93_ADC_MCR_MODE_MASK BIT(29) @@ -58,6 +59,8 @@ #define IMX93_ADC_IMR_ECH_MASK BIT(0) #define IMX93_ADC_PCDR_CDATA_MASK GENMASK(11, 0) +#define IMX93_ADC_CALCFG0_LDFAIL_MASK BIT(4) + /* ADC status */ #define IMX93_ADC_MSR_ADCSTATUS_IDLE 0 #define IMX93_ADC_MSR_ADCSTATUS_POWER_DOWN 1 @@ -145,7 +148,7 @@ static void imx93_adc_config_ad_clk(struct imx93_adc *adc) static int imx93_adc_calibration(struct imx93_adc *adc) { - u32 mcr, msr; + u32 mcr, msr, calcfg; int ret; /* make sure ADC in power down mode */ @@ -158,6 +161,11 @@ static int imx93_adc_calibration(struct imx93_adc *adc) imx93_adc_power_up(adc); + /* Enable loading of calibrated values even in fail condition */ + calcfg = readl(adc->regs + IMX93_ADC_CALCFG0); + calcfg |= IMX93_ADC_CALCFG0_LDFAIL_MASK; + writel(calcfg, adc->regs + IMX93_ADC_CALCFG0); + /* * TODO: we use the default TSAMP/NRSMPL/AVGEN in MCR, * can add the setting of these bit if need in future. @@ -180,9 +188,13 @@ static int imx93_adc_calibration(struct imx93_adc *adc) /* check whether calbration is success or not */ msr = readl(adc->regs + IMX93_ADC_MSR); if (msr & IMX93_ADC_MSR_CALFAIL_MASK) { + /* + * Only give warning here, this means the noise of the + * reference voltage do not meet the requirement: + * ADC reference voltage Noise < 1.8V * 1/2^ENOB + * And the resault of ADC is not that accurate. + */ dev_warn(adc->dev, "ADC calibration failed!\n"); - imx93_adc_power_down(adc); - return -EAGAIN; } return 0; @@ -248,7 +260,6 @@ static int imx93_adc_read_raw(struct iio_dev *indio_dev, mutex_lock(&adc->lock); ret = imx93_adc_read_channel_conversion(adc, chan->channel, val); mutex_unlock(&adc->lock); - pm_runtime_mark_last_busy(dev); pm_runtime_put_sync_autosuspend(dev); if (ret < 0) return ret; @@ -308,8 +319,7 @@ static int imx93_adc_probe(struct platform_device *pdev) indio_dev = devm_iio_device_alloc(dev, sizeof(*adc)); if (!indio_dev) - return dev_err_probe(dev, -ENOMEM, - "Failed allocating iio device\n"); + return -ENOMEM; adc = iio_priv(indio_dev); adc->dev = dev; |