On Thu, Mar 10, 2022 at 05:16:48PM +0100, Miquel Raynal wrote:
> From: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
>
> The CPR register can give the information whether the IP is DMA capable
> or not. Let's extract this information and use it to discriminate when
> the DMA can be hooked up or not.
...
> + /* If we have a valid fifosize and DMA support, try hooking up DMA */
> + if (p->fifosize && data->dma_capable) {
> + if (reg & DW_UART_CPR_DMA_EXTRA)
> + data->dma_capable = 1;
How many designs will be broken by this change?
...
> + unsigned int dma_capable:1;
Note, we use up->dma == NULL for no-DMA, no additional flag is needed.
Just make sure that for your platform you enable DMA by filling that.
--
With Best Regards,
Andy Shevchenko
