On 07/18/2013 11:21 PM, Zubair Lutfullah wrote:
> From: Russ Dill <Russ.Dill@xxxxxx>
>
> The driver is currently mishandling the IRQENABLE register. The driver
> should write a 1 for bits it wishes to set, and a zero for bits it does not
> wish to change. The read of the current register contents is not
> necessary.
>
> Write 0 = No action.
> Read 0 = Interrupt disabled (masked).
> Read 1 = Interrupt enabled.
> Write 1 = Enable interrupt.
>
> The current read/update/write method is currently not causing any
> problems, but could cause confusion in the future.
>
> Signed-off-by: Russ Dill <Russ.Dill@xxxxxx>
> Signed-off-by: Zubair Lutfullah <zubair.lutfullah@xxxxxxxxx>
I guess this makes sense as a separate patch to maintain history, but
I'd personally have preferred it rolled into the write places and
appropriate credit given as comments.
I don't like the fact that the code will be broken in a known fashion
at somepoints in this series...
Jonathan
> ---
> drivers/iio/adc/ti_am335x_adc.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index c1b051c..b566e6a 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -207,7 +207,7 @@ static void tiadc_poll_handler(struct work_struct *work_s)
> container_of(work_s, struct tiadc_device, poll_work);
> struct iio_dev *idev = iio_priv_to_dev(adc_dev);
> struct iio_buffer *buffer = idev->buffer;
> - unsigned int fifo1count, readx1, status;
> + unsigned int fifo1count, readx1;
> int i;
> u32 *inputbuffer;
>
> @@ -223,9 +223,8 @@ static void tiadc_poll_handler(struct work_struct *work_s)
> }
>
> buffer->access->store_to(buffer, (u8 *) inputbuffer);
> - status = tiadc_readl(adc_dev, REG_IRQENABLE);
> tiadc_writel(adc_dev, REG_IRQENABLE,
> - (status | IRQENB_FIFO1THRES));
> + IRQENB_FIFO1THRES);
>
> kfree(inputbuffer);
> }
> @@ -242,7 +241,7 @@ static int tiadc_buffer_postenable(struct iio_dev *idev)
> {
> struct tiadc_device *adc_dev = iio_priv(idev);
> struct iio_buffer *buffer = idev->buffer;
> - unsigned int enb, status, fifo1count;
> + unsigned int enb, fifo1count;
> int stepnum, i;
> u8 bit;
>
> @@ -250,11 +249,10 @@ static int tiadc_buffer_postenable(struct iio_dev *idev)
> pr_info("Data cannot be read continuously in one shot mode\n");
> return -EINVAL;
> } else {
> - status = tiadc_readl(adc_dev, REG_IRQENABLE);
> tiadc_writel(adc_dev, REG_IRQENABLE,
> - (status | IRQENB_FIFO1THRES)|
> - IRQENB_FIFO1OVRRUN |
> - IRQENB_FIFO1UNDRFLW);
> + (IRQENB_FIFO1THRES |
> + IRQENB_FIFO1OVRRUN |
> + IRQENB_FIFO1UNDRFLW));
>
> fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
> for (i = 0; i < fifo1count; i++)
>
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