Hi,
John Youn <johnyoun@xxxxxxxxxxxx> writes:
> From: Vahram Aharonyan <vahrama@xxxxxxxxxxxx>
>
> Add DMA descriptor members to the dwc2_hsotg_ep structure.
>
> Signed-off-by: Vahram Aharonyan <vahrama@xxxxxxxxxxxx>
> Signed-off-by: John Youn <johnyoun@xxxxxxxxxxxx>
> ---
> drivers/usb/dwc2/core.h | 7 +++++++
> drivers/usb/dwc2/gadget.c | 36 ++++++++++++++++++++++++++++++++++--
> 2 files changed, 41 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
> index 9f5fbcf..9155567 100644
> --- a/drivers/usb/dwc2/core.h
> +++ b/drivers/usb/dwc2/core.h
> @@ -172,6 +172,9 @@ struct dwc2_hsotg_req;
> * @periodic: Set if this is a periodic ep, such as Interrupt
> * @isochronous: Set if this is a isochronous ep
> * @send_zlp: Set if we need to send a zero-length packet.
> + * @desc_list_dma: The DMA address of descriptor chain currently in use.
> + * @desc_list: Pointer to descriptor DMA chain head currently in use.
> + * @desc_count: Count of entries within the DMA descriptor chain of EP.
> * @total_data: The total number of data bytes done.
> * @fifo_size: The size of the FIFO (for periodic IN endpoints)
> * @fifo_load: The amount of data loaded into the FIFO (periodic IN)
> @@ -219,6 +222,10 @@ struct dwc2_hsotg_ep {
> #define TARGET_FRAME_INITIAL 0xFFFFFFFF
> bool frame_overrun;
>
> + dma_addr_t desc_list_dma;
> + struct dwc2_dma_desc *desc_list;
> + u8 desc_count;
> +
> char name[10];
> };
>
> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> index 520b98a..47b5ce4 100644
> --- a/drivers/usb/dwc2/gadget.c
> +++ b/drivers/usb/dwc2/gadget.c
> @@ -3086,6 +3086,21 @@ static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
> dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n",
> __func__, epctrl, epctrl_reg);
>
> + /* Allocate DMA descriptor chain for non-ctrl endpoints */
> + if (using_desc_dma(hsotg)) {
> + hs_ep->desc_list = dma_alloc_coherent(hsotg->dev,
> + MAX_DMA_DESC_NUM_GENERIC *
> + sizeof(struct dwc2_dma_desc),
> + &hs_ep->desc_list_dma, GFP_KERNEL);
> + if (!hs_ep->desc_list) {
> + dev_err(hsotg->dev,
> + "%s: unable to allocate desc chain fore EP\n",
> + __func__);
error message is printed for you, please remove
--
balbi
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