From b8ccc593eeeacde0e6794c4dcec0a57eba7356e6 Mon Sep 17 00:00:00 2001 From: John Youn Date: Thu, 17 Dec 2015 11:15:35 -0800 Subject: [PATCH] usb: dwc2: Reorder AHBIDLE and CSFTRST in dwc2_core_reset() According to the databook, the core soft reset should be done before checking for AHBIDLE. The gadget version of core reset had it correct but the hcd version did not. This fixes the hcd version. Signed-off-by: John Youn Reviewed-by: Douglas Anderson Tested-by: Douglas Anderson Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/core.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c index c8f66ad48a55..62505068abf2 100644 --- a/drivers/usb/dwc2/core.c +++ b/drivers/usb/dwc2/core.c @@ -489,32 +489,33 @@ int dwc2_core_reset(struct dwc2_hsotg *hsotg) dev_vdbg(hsotg->dev, "%s()\n", __func__); - /* Wait for AHB master IDLE state */ + /* Core Soft Reset */ + greset = dwc2_readl(hsotg->regs + GRSTCTL); + greset |= GRSTCTL_CSFTRST; + dwc2_writel(greset, hsotg->regs + GRSTCTL); do { udelay(1); greset = dwc2_readl(hsotg->regs + GRSTCTL); if (++count > 50) { dev_warn(hsotg->dev, - "%s() HANG! AHB Idle GRSTCTL=%0x\n", + "%s() HANG! Soft Reset GRSTCTL=%0x\n", __func__, greset); return -EBUSY; } - } while (!(greset & GRSTCTL_AHBIDLE)); + } while (greset & GRSTCTL_CSFTRST); - /* Core Soft Reset */ + /* Wait for AHB master IDLE state */ count = 0; - greset |= GRSTCTL_CSFTRST; - dwc2_writel(greset, hsotg->regs + GRSTCTL); do { udelay(1); greset = dwc2_readl(hsotg->regs + GRSTCTL); if (++count > 50) { dev_warn(hsotg->dev, - "%s() HANG! Soft Reset GRSTCTL=%0x\n", + "%s() HANG! AHB Idle GRSTCTL=%0x\n", __func__, greset); return -EBUSY; } - } while (greset & GRSTCTL_CSFTRST); + } while (!(greset & GRSTCTL_AHBIDLE)); if (hsotg->dr_mode == USB_DR_MODE_HOST) { gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG); -- 2.20.1