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Date: Wed, 13 May 2020 07:50:02 +0530 From: Kishon Vijay Abraham I <kishon@...com> To: Jonathan Bakker <xc-racer2@...e.ca>, <linux-kernel@...r.kernel.org>, <s.nawrocki@...sung.com>, <kamil@...as.org>, <krzk@...nel.org>, <linux-samsung-soc@...r.kernel.org>, Vinod Koul <vkoul@...nel.org> Subject: Re: [PATCH] phy: samsung: s5pv210-usb2: Add delay after reset On 4/25/2020 11:06 PM, Jonathan Bakker wrote: > The USB phy takes some time to reset, so make sure we give it to it. The > delay length was taken from the 4x12 phy driver. > > This manifested in issues with the DWC2 driver since commit fe369e1826b3 > ("usb: dwc2: Make dwc2_readl/writel functions endianness-agnostic.") > where the endianness check would read the DWC ID as 0 due to the phy still > resetting, resulting in the wrong endian mode being chosen. > > Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca> merged, thanks! -Kishon > --- > drivers/phy/samsung/phy-s5pv210-usb2.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/phy/samsung/phy-s5pv210-usb2.c b/drivers/phy/samsung/phy-s5pv210-usb2.c > index 56a5083fe6f9..32be62e49804 100644 > --- a/drivers/phy/samsung/phy-s5pv210-usb2.c > +++ b/drivers/phy/samsung/phy-s5pv210-usb2.c > @@ -139,6 +139,10 @@ static void s5pv210_phy_pwr(struct samsung_usb2_phy_instance *inst, bool on) > udelay(10); > rst &= ~rstbits; > writel(rst, drv->reg_phy + S5PV210_UPHYRST); > + /* The following delay is necessary for the reset sequence to be > + * completed > + */ > + udelay(80); > } else { > pwr = readl(drv->reg_phy + S5PV210_UPHYPWR); > pwr |= phypwr; >
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