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| author |   Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2021-11-29 18:53:09 -0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-03 12:02:49 +0100 |
| commit | bc27117c7cdd4b57d0f079620b483f3b229074bd (patch) | |
| tree | 24c77db9534576a6c7190f28999348aceefd0ea7 /drivers/usb/dwc3/gadget.c | |
| parent | Merge 5.16-rc3 into usb-next (diff) | |
| download | linux-dev-bc27117c7cdd4b57d0f079620b483f3b229074bd.tar.xz linux-dev-bc27117c7cdd4b57d0f079620b483f3b229074bd.zip | |
usb: dwc3: gadget: Skip checking Update Transfer status
If we're not setting CMDACT (from "No Response" Update Transfer
command), then there's no point in checking for the command status. So
skip it. This can reduce a register read delay and improve performance.
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/3dc31cf11581ae3ee82d9202dda3fc17d897d786.1638240306.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 7e3db00e9759..00b3f19c4d3e 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -357,6 +357,12 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd, cmd |= DWC3_DEPCMD_CMDACT; dwc3_writel(dep->regs, DWC3_DEPCMD, cmd); + + if (!(cmd & DWC3_DEPCMD_CMDACT)) { + ret = 0; + goto skip_status; + } + do { reg = dwc3_readl(dep->regs, DWC3_DEPCMD); if (!(reg & DWC3_DEPCMD_CMDACT)) { @@ -398,6 +404,7 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd, cmd_status = -ETIMEDOUT; } +skip_status: trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status); if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) { |