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UPSTREAM: usb: dwc3: gadget: Ignore Update Transfer cmd params

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The controller doesn't check for Update Transfer command parameters
DEPCMDPAR{0,1,2}. Writing to these registers is unnecessary. Ignoring
this improves performance slightly by removing the register write
delay.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/997d9ebf38c6bba920d4ee77bd8c77bf81978a55.1638240306.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit a02a26eb0a)

Bug: 263189538
Change-Id: Ie30380e71dfd7febb71eb0c3c725f336f4d6da9a
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
This commit is contained in:
Thinh Nguyen
2021-11-29 18:53:16 -08:00
committed by Todd Kjos
parent 0761373d2f
commit 15b61c98d6
1 changed files with 11 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/usb/dwc3/gadget.c
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@@ -331,9 +331,17 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd,
}
}
dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
/*
* For some commands such as Update Transfer command, DEPCMDPARn
* registers are reserved. Since the driver often sends Update Transfer
* command, don't write to DEPCMDPARn to avoid register write delays and
* improve performance.
*/
if (DWC3_DEPCMD_CMD(cmd) != DWC3_DEPCMD_UPDATETRANSFER) {
dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
}
/*
* Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're