Re: [PATCH RESEND v4] dmaengine: dw-edma: Enable HDMA 64R/W Channels

[Frank Li]

On Tue, Jun 23, 2026 at 04:56:47PM +0530, Devendra K Verma wrote:
> As per 'Designware Cores PCI Express Controller Databook',
> Section 7.1 - Overview, HDMA supports 64 Read and 64 Write
> channels. Current controller driver supports up to 8 read and
> write channels only. In order to utilize all the channels the
> controller driver need to have the channel related structs
> and variables as per the number of channels supported by IP.
> Following changes are made to enable 64 Read / 64 Write
> channel support:
>
>  o Defined HDMA specific macros to reflect the channel count.
>  o The count of ll_regions and dt_regions in dw_edma_chip and
>    dw_edma_pcie_data shall be in accordance to number of read
>    and write channels.
>  o In dw_edma_probe() configure the channels as per the channels
>    of the IP used.
>  o Changed mask types to u64 for higher channel counts.
>
> Signed-off-by: Devendra K Verma <devendra.verma@xxxxxxx>
> ---
...
>
> @@ -118,7 +129,8 @@ dw_hdma_v0_core_handle_int(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir,
>  	unsigned long total, pos, val;
>  	irqreturn_t ret = IRQ_NONE;
>  	struct dw_edma_chan *chan;
> -	unsigned long off, mask;
> +	unsigned long off;
> +	u64 mask;
>
>  	if (dir == EDMA_DIR_WRITE) {
>  		total = dw->wr_ch_cnt;
> @@ -130,7 +142,11 @@ dw_hdma_v0_core_handle_int(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir,
>  		mask = dw_irq->rd_mask;
>  	}
>
> -	for_each_set_bit(pos, &mask, total) {
> +	while (mask) {

can you use  DECLARE_BITMAP(status_mask, 64); and keep original for_each_set_bit()
ref:

https://lore.kernel.org/dmaengine/aj1JrufD1vIZH06s@lizhi-Precision-Tower-5810/T/#u

Frank