The current logic is rigid, setting num_fifos to fixed values: 3 for any maxburst greater than 1. tx_fifo_resize_max_num for maxburst greater than 6. Additionally, it did not differentiate much between bulk and isochronous transfers, applying similar logic to both. The updated logic is more flexible and specifically designed to meet the unique requirements of both bulk and isochronous transfers. We have made every effort to satisfy all needs and requirements, but please note that this has only been verified on our specific platform and application. Bulk Transfers: Ensures that num_fifos is optimized by considering both the maxburst value and the maximum allowed number of FIFOs based on the DT property tx_fifo_resize_max_num and the maximum packet multiplier for HS. Isochronous Transfers: Ensures that num_fifos is sufficient by considering the maximum packet multiplier for HS and maxburst for SS, along with a constraint with the DT property tx_fifo_resize_max_num. This change aims to optimize the allocation of Tx FIFOs for both bulk and isochronous endpoints, potentially improving data transfer efficiency and overall performance. It also enhances support for all use cases, which can be tweaked with DT parameters and the endpoint’s maxburst and maxpacket. Signed-off-by: Akash Kumar <quic_akakum@xxxxxxxxxxx> --- Changes for v4: Updated commit message as per review comments to clarify that it has been tested on specific platforms only and tried best to match all expectations. Changes for v3: Redefine logic for resizing tx fifos,added check based on operating speed and used maxp for HS and maxburst for SS and defined max allocation based on dt property. Changes for v2: Redefine logic for resizing tx fifos, handled fifo based on minimum of maxp and maxburts. Changes for v1: Added additional condition to allocate tx fifo for hs isoc eps, keeping the other resize logic same. --- drivers/usb/dwc3/gadget.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 89fc690fdf34..7557bd0053a7 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -778,15 +778,19 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep) ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7); - if ((dep->endpoint.maxburst > 1 && - usb_endpoint_xfer_bulk(dep->endpoint.desc)) || - usb_endpoint_xfer_isoc(dep->endpoint.desc)) - num_fifos = 3; + if (dwc->gadget->speed <= USB_SPEED_HIGH && + (usb_endpoint_xfer_bulk(dep->endpoint.desc) || + usb_endpoint_xfer_isoc(dep->endpoint.desc))) + num_fifos = min_t(unsigned int, + usb_endpoint_maxp_mult(dep->endpoint.desc) + 1, + dwc->tx_fifo_resize_max_num); - if (dep->endpoint.maxburst > 6 && + if (dwc->gadget->speed > USB_SPEED_HIGH && (usb_endpoint_xfer_bulk(dep->endpoint.desc) || - usb_endpoint_xfer_isoc(dep->endpoint.desc)) && DWC3_IP_IS(DWC31)) - num_fifos = dwc->tx_fifo_resize_max_num; + usb_endpoint_xfer_isoc(dep->endpoint.desc))) + num_fifos = min_t(unsigned int, + dep->endpoint.maxburst, + dwc->tx_fifo_resize_max_num); /* FIFO size for a single buffer */ fifo = dwc3_gadget_calc_tx_fifo_size(dwc, 1); -- 2.17.1
