linux-kernel - Re: [Patch v9 3/3] phy: Add Qualcomm DWC3 HS/SS PHY driver

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Message-ID: <20140914022452.GA16652@saruman.home>
Date:	Sat, 13 Sep 2014 21:24:52 -0500
From:	Felipe Balbi <balbi@...com>
To:	Kishon Vijay Abraham I <kishon@...com>
CC:	Andy Gross <agross@...eaurora.org>, Felipe Balbi <balbi@...com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Jack Pham <jackp@...eaurora.org>,
	Kumar Gala <galak@...eaurora.org>,
	<linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	"Ivan T. Ivanov" <iivanov@...sol.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Subject: Re: [Patch v9 3/3] phy: Add Qualcomm DWC3 HS/SS PHY driver

Hi,

On Sat, Sep 13, 2014 at 12:16:01PM +0530, Kishon Vijay Abraham I wrote:
> On Saturday 13 September 2014 12:58 AM, Andy Gross wrote:
> > This patch adds a new driver for the Qualcomm USB 3.0 PHY that exists on some
> > Qualcomm platforms.  This driver uses the generic PHY framework and will
> > interact with the DWC3 controller.
> 
> Do you have dt documentation for this driver?

see patch 1

> > +static inline void qcom_dwc3_phy_write_readback(
> > +	struct qcom_dwc3_usb_phy *phy_dwc3, u32 offset,
> > +	const u32 mask, u32 val)
> > +{
> > +	u32 write_val, tmp = readl(phy_dwc3->base + offset);
> > +
> > +	tmp &= ~mask;		/* retain other bits */
> > +	write_val = tmp | val;
> > +
> > +	writel(write_val, phy_dwc3->base + offset);
> > +
> > +	/* Read back to see if val was written */
> 
> Does it fail sometime? I'm not sure if this should be present in the
> driver since this looks more of a debug code.

this was mentioned before. Silicon bug.

> > +	writel_relaxed(data | SSUSB_CTRL_SS_PHY_RESET,
> > +		phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> > +	usleep_range(2000, 2200);
> 
> use msleep here..

why ? usleep_range() gives the scheduler oportunity to group timers.

-- 
balbi

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