Eric Lee / linux-smarc-t335x-v3.2

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Commit 18ce4a630452348b8308b922491130e8ce1e9134

Authored by Russ Dill
Committed by Vaibhav Hiremath
1 parent a819c4feaf
Exists in v3.2_SMARCT335xPSP_04.06.00.11 and in 3 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN

IIO: ti_adc: Fix capture operation during resume. 

The ADC needs to go through a proper initialization sequence after
resuming from suspend.

Signed-off-by: Russ Dill <Russ.Dill@ti.com>

Showing 1 changed file with 5 additions and 1 deletions Side-by-side Diff

drivers/staging/iio/adc/ti_adc.c
Diff comments   View file @ 18ce4a6
... ... @@ -510,12 +510,16 @@
510 510 struct adc_device *adc_dev = tscadc_dev->adc;
511 511 unsigned int restore;
512 512  
  513 + restore = adc_readl(adc_dev, TSCADC_REG_CTRL);
  514 + restore &= ~(TSCADC_CNTRLREG_TSCSSENB);
  515 + adc_writel(adc_dev, TSCADC_REG_CTRL, restore);
  516 +
513 517 adc_writel(adc_dev, TSCADC_REG_FIFO1THR, FIFO1_THRESHOLD);
514 518 adc_step_config(adc_dev, adc_dev->is_continuous_mode);
515 519  
516 520 /* Make sure ADC is powered up */
517   - restore = adc_readl(adc_dev, TSCADC_REG_CTRL);
518 521 restore &= ~(TSCADC_CNTRLREG_POWERDOWN);
  522 + restore |= TSCADC_CNTRLREG_TSCSSENB;
519 523 adc_writel(adc_dev, TSCADC_REG_CTRL, restore);
520 524 return 0;
521 525 }