On 08/11/2015 03:30 PM, Russell King - ARM Linux wrote:
> On Tue, Aug 11, 2015 at 03:02:44PM +0300, Peter Ujfalusi wrote:
>> On 08/07/2015 11:00 PM, Sebastian Andrzej Siewior wrote:
>>> + /*
>>> +* We do not allow DMA_MEM_TO_DEV transfers to be paused.
>>> +* From the AM572x TRM, 16.1.4.1
On Tue, Aug 11, 2015 at 03:02:44PM +0300, Peter Ujfalusi wrote:
> On 08/07/2015 11:00 PM, Sebastian Andrzej Siewior wrote:
> > + /*
> > +* We do not allow DMA_MEM_TO_DEV transfers to be paused.
> > +* From the AM572x TRM, 16.1.4.18 Disabling a Channel During Transfer:
> > +* "When a c
On 08/07/2015 11:00 PM, Sebastian Andrzej Siewior wrote:
> -static void omap_dma_stop(struct omap_chan *c)
> +static void omap_dma_drain_chan(struct omap_chan *c)
> +{
> + int i;
> + uint32_t val;
> +
> + /* Wait for sDMA FIFO to drain */
> + for (i = 0; ; i++) {
> + val
This DMA driver is used by 8250-omap on DRA7-evm. There is one
requirement that is to pause a transfer. This is currently used on the RX
side. It is possible that the UART HW aborted the RX (UART's RX-timeout)
but the DMA controller starts the transfer shortly after.
Before we can manually purge th
