Commit 7295475758e73aa72a92cdc720186698cec8d033
Committed by
Vaibhav Hiremath
Vaibhav Hiremath
1 parent
da42b4c279
Exists in
v3.2_SMARCT335xPSP_04.06.00.11
and in
3 other branches
IIO: ti_adc: Reset and clear overrun status before capture.
While not pulling out samples, the FIFO will fill up causing an overrun event. Before starting up another continuous sample, clear that event. Signed-off-by: Russ Dill <Russ.Dill@ti.com>
Showing 1 changed file with 16 additions and 9 deletions Side-by-side Diff
drivers/staging/iio/adc/ti_adc.c
| ... | ... | @@ -231,22 +231,29 @@ |
| 231 | 231 | { |
| 232 | 232 | struct adc_device *adc_dev = iio_priv(idev); |
| 233 | 233 | struct iio_buffer *buffer = idev->buffer; |
| 234 | - unsigned int enb, fifo1count; | |
| 235 | - int stepnum, i; | |
| 234 | + unsigned int enb, config; | |
| 235 | + int stepnum; | |
| 236 | 236 | u8 bit; |
| 237 | 237 | |
| 238 | 238 | if (!adc_dev->is_continuous_mode) { |
| 239 | 239 | pr_info("Data cannot be read continuously in one shot mode\n"); |
| 240 | 240 | return -EINVAL; |
| 241 | 241 | } else { |
| 242 | - adc_writel(adc_dev, TSCADC_REG_IRQENABLE, | |
| 243 | - (TSCADC_IRQENB_FIFO1THRES | | |
| 244 | - TSCADC_IRQENB_FIFO1OVRRUN | | |
| 245 | - TSCADC_IRQENB_FIFO1UNDRFLW)); | |
| 246 | 242 | |
| 247 | - fifo1count = adc_readl(adc_dev, TSCADC_REG_FIFO1CNT); | |
| 248 | - for (i = 0; i < fifo1count; i++) | |
| 249 | - adc_readl(adc_dev, TSCADC_REG_FIFO1); | |
| 243 | + config = adc_readl(adc_dev, TSCADC_REG_CTRL); | |
| 244 | + adc_writel(adc_dev, TSCADC_REG_CTRL, | |
| 245 | + config & ~TSCADC_CNTRLREG_TSCSSENB); | |
| 246 | + adc_writel(adc_dev, TSCADC_REG_CTRL, | |
| 247 | + config | TSCADC_CNTRLREG_TSCSSENB); | |
| 248 | + | |
| 249 | + | |
| 250 | + adc_writel(adc_dev, TSCADC_REG_IRQSTATUS, | |
| 251 | + TSCADC_IRQENB_FIFO1THRES | | |
| 252 | + TSCADC_IRQENB_FIFO1OVRRUN | | |
| 253 | + TSCADC_IRQENB_FIFO1UNDRFLW); | |
| 254 | + adc_writel(adc_dev, TSCADC_REG_IRQENABLE, | |
| 255 | + TSCADC_IRQENB_FIFO1THRES | | |
| 256 | + TSCADC_IRQENB_FIFO1OVRRUN); | |
| 250 | 257 | |
| 251 | 258 | adc_writel(adc_dev, TSCADC_REG_SE, 0x00); |
| 252 | 259 | for_each_set_bit(bit, buffer->scan_mask, |