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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>
This commit is contained in:
Thinh Nguyen 2021-11-29 18:53:09 -08:00 committed by Greg Kroah-Hartman
parent 4d01204016
commit bc27117c7c
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/dwc3/gadget.c
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@ -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) {