From 2b758350af19db9a5c98241cf222c2e211d7a912 Mon Sep 17 00:00:00 2001 From: Pratyush Anand Date: Mon, 14 Jan 2013 15:59:31 +0530 Subject: [PATCH] usb: dwc3: Enable usb2 LPM only when connected as usb2.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Synopsys says: The HIRD Threshold field must be set to ‘0’ when the device core is operating in super speed mode. This patch implements above statement. Cc: # v3.6 v3.7 v3.8 Acked-by: Paul Zimmerman Signed-off-by: Pratyush Anand Signed-off-by: Felipe Balbi --- drivers/usb/dwc3/gadget.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 0b92e982ac54..113ec80dcc26 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2154,6 +2154,23 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) break; } + /* Enable USB2 LPM Capability */ + + if ((dwc->revision > DWC3_REVISION_194A) + && (speed != DWC3_DCFG_SUPERSPEED)) { + reg = dwc3_readl(dwc->regs, DWC3_DCFG); + reg |= DWC3_DCFG_LPM_CAP; + dwc3_writel(dwc->regs, DWC3_DCFG, reg); + + reg = dwc3_readl(dwc->regs, DWC3_DCTL); + reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN); + + /* TODO: This should be configurable */ + reg |= DWC3_DCTL_HIRD_THRES(28); + + dwc3_writel(dwc->regs, DWC3_DCTL, reg); + } + /* Recent versions support automatic phy suspend and don't need this */ if (dwc->revision < DWC3_REVISION_194A) { /* Suspend unneeded PHY */ @@ -2460,20 +2477,8 @@ int dwc3_gadget_init(struct dwc3 *dwc) DWC3_DEVTEN_DISCONNEVTEN); dwc3_writel(dwc->regs, DWC3_DEVTEN, reg); - /* Enable USB2 LPM and automatic phy suspend only on recent versions */ + /* automatic phy suspend only on recent versions */ if (dwc->revision >= DWC3_REVISION_194A) { - reg = dwc3_readl(dwc->regs, DWC3_DCFG); - reg |= DWC3_DCFG_LPM_CAP; - dwc3_writel(dwc->regs, DWC3_DCFG, reg); - - reg = dwc3_readl(dwc->regs, DWC3_DCTL); - reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN); - - /* TODO: This should be configurable */ - reg |= DWC3_DCTL_HIRD_THRES(28); - - dwc3_writel(dwc->regs, DWC3_DCTL, reg); - dwc3_gadget_usb2_phy_suspend(dwc, false); dwc3_gadget_usb3_phy_suspend(dwc, false); } -- 2.20.1