From 7cc1392aabc31d2af9bd3cc5febbd91977452181 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Fri, 2 Apr 2010 16:31:03 +0100 Subject: mfd: Improve WM831x AUXADC completion handling Currently completion of WM831x AUXADC conversions is monitored by checking for convertor enable. Due to the mechanism used to ensure data corruption is avoided when reading AUXADC data there may under heavy I/O be a window where this bit has cleared but the conversion results have not been updated. Data availability is only guaranteed after the AUXADC data interrupt has been asserted. Avoid this by always using the interrupt to detect completion. If the chip IRQ is not set up then we poll the IRQ status register for up to 5ms. If it is set up then we rely on the data done interrupt with a vastly increased timeout, failing the conversion if the interrupt is not generated. This also saves a register read when using interrupts. Signed-off-by: Mark Brown Signed-off-by: Samuel Ortiz --- drivers/mfd/wm831x-core.c | 65 ++++++++++++++++++++++++++++++++++------------- 1 file changed, 48 insertions(+), 17 deletions(-) (limited to 'drivers/mfd') diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c index f2ab025ad97a..da00ca9e0c71 100644 --- a/drivers/mfd/wm831x-core.c +++ b/drivers/mfd/wm831x-core.c @@ -322,7 +322,11 @@ EXPORT_SYMBOL_GPL(wm831x_set_bits); */ int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input) { - int ret, src; + int ret, src, irq_masked, timeout; + + /* Are we using the interrupt? */ + irq_masked = wm831x_reg_read(wm831x, WM831X_INTERRUPT_STATUS_1_MASK); + irq_masked &= WM831X_AUXADC_DATA_EINT; mutex_lock(&wm831x->auxadc_lock); @@ -342,6 +346,9 @@ int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input) goto out; } + /* Clear any notification from a very late arriving interrupt */ + try_wait_for_completion(&wm831x->auxadc_done); + ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, WM831X_AUX_CVT_ENA, WM831X_AUX_CVT_ENA); if (ret < 0) { @@ -349,22 +356,46 @@ int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input) goto disable; } - /* If an interrupt arrived late clean up after it */ - try_wait_for_completion(&wm831x->auxadc_done); - - /* Ignore the result to allow us to soldier on without IRQ hookup */ - wait_for_completion_timeout(&wm831x->auxadc_done, msecs_to_jiffies(5)); - - ret = wm831x_reg_read(wm831x, WM831X_AUXADC_CONTROL); - if (ret < 0) { - dev_err(wm831x->dev, "AUXADC status read failed: %d\n", ret); - goto disable; - } - - if (ret & WM831X_AUX_CVT_ENA) { - dev_err(wm831x->dev, "Timed out reading AUXADC\n"); - ret = -EBUSY; - goto disable; + if (irq_masked) { + /* If we're not using interrupts then poll the + * interrupt status register */ + timeout = 5; + while (timeout) { + msleep(1); + + ret = wm831x_reg_read(wm831x, + WM831X_INTERRUPT_STATUS_1); + if (ret < 0) { + dev_err(wm831x->dev, + "ISR 1 read failed: %d\n", ret); + goto disable; + } + + /* Did it complete? */ + if (ret & WM831X_AUXADC_DATA_EINT) { + wm831x_reg_write(wm831x, + WM831X_INTERRUPT_STATUS_1, + WM831X_AUXADC_DATA_EINT); + break; + } else { + dev_err(wm831x->dev, + "AUXADC conversion timeout\n"); + ret = -EBUSY; + goto disable; + } + } + } else { + /* If we are using interrupts then wait for the + * interrupt to complete. Use an extremely long + * timeout to handle situations with heavy load where + * the notification of the interrupt may be delayed by + * threaded IRQ handling. */ + if (!wait_for_completion_timeout(&wm831x->auxadc_done, + msecs_to_jiffies(500))) { + dev_err(wm831x->dev, "Timed out waiting for AUXADC\n"); + ret = -EBUSY; + goto disable; + } } ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA); -- cgit v1.2.2