diff options
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/dwc2.c | 81 |
1 files changed, 66 insertions, 15 deletions
diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c index 7fbbc4bc7f..413845cdc2 100644 --- a/drivers/usb/host/dwc2.c +++ b/drivers/usb/host/dwc2.c @@ -837,6 +837,8 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev, int eptype = dwc2_eptype[usb_pipetype(pipe)]; int done = 0; int ret = 0; + int do_split = 0; + int complete_split = 0; uint32_t xfer_len; uint32_t num_packets; int stop_transfer = 0; @@ -859,8 +861,26 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev, dwc_otg_hc_init(regs, DWC2_HC_CHANNEL, dev, devnum, ep, in, eptype, max); + /* Check if the target is a FS/LS device behind a HS hub */ + if (dev->speed != USB_SPEED_HIGH) { + uint8_t hub_addr; + uint8_t hub_port; + uint32_t hprt0 = readl(®s->hprt0); + if ((hprt0 & DWC2_HPRT0_PRTSPD_MASK) == + DWC2_HPRT0_PRTSPD_HIGH) { + usb_find_usb2_hub_address_port(dev, &hub_addr, + &hub_port); + dwc_otg_hc_init_split(hc_regs, hub_addr, hub_port); + + do_split = 1; + num_packets = 1; + max_xfer_len = max; + } + } + do { int actual_len = 0; + uint32_t hcint; xfer_len = len - done; if (xfer_len > max_xfer_len) @@ -870,10 +890,29 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev, else num_packets = 1; + if (complete_split) + setbits_le32(&hc_regs->hcsplt, DWC2_HCSPLT_COMPSPLT); + else if (do_split) + clrbits_le32(&hc_regs->hcsplt, DWC2_HCSPLT_COMPSPLT); + ret = transfer_chunk(hc_regs, priv->aligned_buffer, pid, in, (char *)buffer + done, num_packets, xfer_len, &actual_len); + hcint = readl(&hc_regs->hcint); + if (complete_split) { + stop_transfer = 0; + if (hcint & DWC2_HCINT_NYET) + ret = 0; + else + complete_split = 0; + } else if (do_split) { + if (hcint & DWC2_HCINT_ACK) { + ret = 0; + complete_split = 1; + } + } + if (ret) break; @@ -882,7 +921,11 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev, done += actual_len; - } while ((done < len) && !stop_transfer); + /* Transactions are done when when either all data is transferred or + * there is a short transfer. In case of a SPLIT make sure the CSPLIT + * is executed. + */ + } while (((done < len) && !stop_transfer) || complete_split); writel(0, &hc_regs->hcintmsk); writel(0xFFFFFFFF, &hc_regs->hcint); @@ -925,31 +968,39 @@ static int _submit_control_msg(struct dwc2_priv *priv, struct usb_device *dev, setup); } + /* SETUP stage */ pid = DWC2_HC_PID_SETUP; - ret = chunk_msg(priv, dev, pipe, &pid, 0, setup, 8); + do { + ret = chunk_msg(priv, dev, pipe, &pid, 0, setup, 8); + } while (ret == -EAGAIN); if (ret) return ret; + /* DATA stage */ + act_len = 0; if (buffer) { pid = DWC2_HC_PID_DATA1; - ret = chunk_msg(priv, dev, pipe, &pid, usb_pipein(pipe), buffer, - len); + do { + ret = chunk_msg(priv, dev, pipe, &pid, usb_pipein(pipe), + buffer, len); + act_len += dev->act_len; + buffer += dev->act_len; + len -= dev->act_len; + } while (ret == -EAGAIN); if (ret) return ret; - act_len = dev->act_len; - } /* End of DATA stage */ - else - act_len = 0; - - /* STATUS stage */ - if ((len == 0) || usb_pipeout(pipe)) + status_direction = usb_pipeout(pipe); + } else { + /* No-data CONTROL always ends with an IN transaction */ status_direction = 1; - else - status_direction = 0; + } + /* STATUS stage */ pid = DWC2_HC_PID_DATA1; - ret = chunk_msg(priv, dev, pipe, &pid, status_direction, - priv->status_buffer, 0); + do { + ret = chunk_msg(priv, dev, pipe, &pid, status_direction, + priv->status_buffer, 0); + } while (ret == -EAGAIN); if (ret) return ret; |
