From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751514AbdFGBnQ (ORCPT ); Tue, 6 Jun 2017 21:43:16 -0400 Received: from mail-sn1nam01on0076.outbound.protection.outlook.com ([104.47.32.76]:8008 "EHLO NAM01-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751453AbdFGBnM (ORCPT ); Tue, 6 Jun 2017 21:43:12 -0400 Authentication-Results: spf=softfail (sender IP is 192.88.158.2) smtp.mailfrom=gmail.com; vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=fail action=none header.from=gmail.com; Date: Wed, 7 Jun 2017 09:43:12 +0800 From: Peter Chen To: Fabien Lahoudere CC: Stephen Boyd , Peter Chen , Peter Senna Tschudin , Felipe Balbi , Greg Kroah-Hartman , "open list:USB PHY LAYER" , open list Subject: Re: [RFC] usb-phy-generic: Add support to SMSC USB3315 Message-ID: <20170607014312.GA10588@b29397-desktop> References: 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1;BLUPR03MB167;7:Z12Hs7B1pRMDscOtwfZQvlIRiABIk2dJnpuOCB9fCZ3uXwDCcxLi7WRXQc5CwdK5CnikN8h2kug+MpGuIkkMlYzYsmllFB1cvu3ndTYFADMMOwC1qGk5kG7fGOa9EbFrIFX698zYL6qq154yKMe5vn3II83NWmBVg8GOxr2sYPmHcAaB3laZGAQzoKWQSpDEH+Ej2LUiPNBkQ8swhNJ57uVJdIjvg8bC4DU4U0Zl6A62OvTcq4wWYqGM1xhH9H8cu4BEHbUqYiY1gasRl4UKivJPzuBW1ZxSbtu3aSRmsjGED5x3kLuhYXCV2D5WKbh2Goe6umD1Vnhx2tVnuPjqRg== X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jun 2017 01:43:09.2501 (UTC) X-MS-Exchange-CrossTenant-Id: 5afe0b00-7697-4969-b663-5eab37d5f47e X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=5afe0b00-7697-4969-b663-5eab37d5f47e;Ip=[192.88.158.2];Helo=[az84smr01.freescale.net] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BLUPR03MB167 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 06, 2017 at 07:36:10PM +0200, Fabien Lahoudere wrote: > Hi Peter, > > On Tue, 2017-06-06 at 09:55 +0800, Peter Chen wrote: > > On Mon, Jun 05, 2017 at 11:52:26AM +0200, Fabien Lahoudere wrote: > > > On Mon, 2017-06-05 at 17:43 +0800, Peter Chen wrote: > > > > On Mon, Jun 05, 2017 at 10:57:00AM +0200, Fabien Lahoudere wrote: > > > > > On Fri, 2017-06-02 at 15:00 -0700, Stephen Boyd wrote: > > > > > > On 05/26, Fabien Lahoudere wrote: > > > > > > > Hello > > > > > > > > > > > > > > I modify ci_hrdc_imx_probe to bypass "data->phy = devm_usb_get_phy_by_phandle(&pdev- > > > > > > > >dev, > > > > > > > "fsl,usbphy", 0);". Everything works as expected and call ci_ulpi_init. > > > > > > > > > > > > > > The problem is that in ci_ulpi_init, before calling "ci->ulpi = > > > > > > > ulpi_register_interface(ci- > > > > > > > > dev, > > > > > > > > > > > > > > &ci->ulpi_ops);" (to initialize our phy), "hw_phymode_configure(ci);" is called which is > > > > > > > the > > > > > > > original function that make our system to hang. > > > > > > > > > > > > > > Our phy is not initialised before calling ulpi_register_interface so I don't understand > > > > > > > how > > > > > > > the > > > > > > > phy > > > > > > > can reply if it is not out of reset state. > > > > > > > > > > > > I haven't see any problem in hw_phymode_configure(). What's the > > > > > > value of ci->platdata->phy_mode? USBPHY_INTERFACE_MODE_ULPI? If > > > > > > you phy needs to be taken out of reset to reply to the ulpi reads > > > > > > of the vendor/product ids, then it sounds like you have a similar > > > > > > situation to what I had. I needed to turn on some regulators to > > > > > > get those reads to work, otherwise they would fail, but knowing > > > > > > what needed to be turned on basically meant I needed to probe the > > > > > > ulpi driver so probing the ids wasn't going to be useful. So on > > > > > > my device the reads for the ids go through, but they get all > > > > > > zeroes back, which is actually ok because there aren't any bits > > > > > > set on my devices anyway. After the reads see 0, we fallback to > > > > > > DT matching, which avoids the "bring it out of reset/power it on" > > > > > > sorts of problems entirely. > > > > > > > > > > > > > > > > Yes the phy mode is configured to USBPHY_INTERFACE_MODE_ULPI. > > > > > Indeed, this phy need to be out of reset to work. For example everything works fine if I > > > > > call  > > > > > "_ci_usb_phy_init(ci);" before calling "hw_phymode_configure(ci);" > > > > > This function only init reset GPIO and clock. > > > > > > > > > > For information, the original patch I have to fix the issue: > > > > > > > > > > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c > > > > > index 79ad8e9..21aaff1 100644 > > > > > --- a/drivers/usb/chipidea/core.c > > > > > +++ b/drivers/usb/chipidea/core.c > > > > > @@ -391,6 +391,7 @@ static int ci_usb_phy_init(struct ci_hdrc *ci) > > > > >   case USBPHY_INTERFACE_MODE_UTMI: > > > > >   case USBPHY_INTERFACE_MODE_UTMIW: > > > > >   case USBPHY_INTERFACE_MODE_HSIC: > > > > > + case USBPHY_INTERFACE_MODE_ULPI: > > > > >   ret = _ci_usb_phy_init(ci); > > > > >   if (!ret) > > > > >   hw_wait_phy_stable(); > > > > > @@ -398,7 +399,6 @@ static int ci_usb_phy_init(struct ci_hdrc *ci) > > > > >   return ret; > > > > >   hw_phymode_configure(ci); > > > > >   break; > > > > > - case USBPHY_INTERFACE_MODE_ULPI: > > > > >   case USBPHY_INTERFACE_MODE_SERIAL: > > > > >   hw_phymode_configure(ci); > > > > >   ret = _ci_usb_phy_init(ci); > > > > > --  > > > > > > > > Currently, the hw_phymode_configure is called twice for ULPI PHY, the > > > > two execution are between _ci_usb_phy_init, would you test which one > > > > causes hang? If the second causes hang, you can make a patch for > > > > hw_phymode_configure that if the required PORTSC_PTS is the same > > > > the value in register, do noop. > > > > > > The first one hangs, _ci_usb_phy_init is not called due to hang. > > > > > > > So, you need to comment out hw_phymode_configure at ci_ulpi_init, and you > > can't get vid/pid correctly, right? If it is, we may need to add power on > > sequence at chipidea core driver (ci_hdrc_probe) for clock and reset things. > > > > http://www.spinics.net/lists/linux-usb/msg157134.html > > > > I am wondering if we can call ci_usb_phy_init before calling ci_ulpi_init, > > since we need to let hardware be ready before reading vid/pid. > > Stephen & Fabien, does that work for you? > > > > I test the following patch and it works. But I am not sure that we can move safely ci_ulpi_init. > I will investigate more tomorrow if it is a problem for other phys. > > Is it a good approach? > > Subject: [PATCH 1/1] power on phy before getting vid/pid > > Signed-off-by: Fabien Lahoudere > --- >  drivers/usb/chipidea/core.c | 12 ++++++++---- >  drivers/usb/chipidea/ulpi.c | 19 +++++++++++++++++++ >  2 files changed, 27 insertions(+), 4 deletions(-) > > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c > index 79ad8e9..26889e1 100644 > --- a/drivers/usb/chipidea/core.c > +++ b/drivers/usb/chipidea/core.c > @@ -879,10 +879,6 @@ static int ci_hdrc_probe(struct platform_device *pdev) >   return -ENODEV; >   } >   > - ret = ci_ulpi_init(ci); > - if (ret) > - return ret; > - >   if (ci->platdata->phy) { >   ci->phy = ci->platdata->phy; >   } else if (ci->platdata->usb_phy) { > @@ -909,6 +905,14 @@ static int ci_hdrc_probe(struct platform_device *pdev) >   ci->usb_phy = NULL; >   } >   > + /*  > +    We move this in order to have phy reset and gpio information > +    before calling ci_ulpi_init. > + */ > + ret = ci_ulpi_init(ci); > + if (ret) > + return ret; > + >   ret = ci_usb_phy_init(ci); >   if (ret) { >   dev_err(dev, "unable to init phy: %d\n", ret); > diff --git a/drivers/usb/chipidea/ulpi.c b/drivers/usb/chipidea/ulpi.c > index 1219583..1c272e4 100644 > --- a/drivers/usb/chipidea/ulpi.c > +++ b/drivers/usb/chipidea/ulpi.c > @@ -73,9 +73,28 @@ static int ci_ulpi_write(struct device *dev, u8 addr, u8 val) >   >  int ci_ulpi_init(struct ci_hdrc *ci) >  { > +        int ret; >   if (ci->platdata->phy_mode != USBPHY_INTERFACE_MODE_ULPI) >   return 0; >   > + /*  > +    This is the content of _ci_usb_phy_init from core.c to power on the phy. > +    Duplicated for test purpose only. > + */ > + if (ci->phy) { > + ret = phy_init(ci->phy); > + if (ret) > + return ret; > + > + ret = phy_power_on(ci->phy); > + if (ret) { > + phy_exit(ci->phy); > + return ret; > + } > + } else { > + ret = usb_phy_init(ci->usb_phy); > + } > + >   /* >    * Set PORTSC correctly so we can read/write ULPI registers for >    * identification purposes Your above patch is not accepted. I don't know ULPI PHY behavior at imx53, would you please make clear below things: - Before setting phy mode at portsc, which you need to do? If they can't be in phy_init, you may register a power sequence instance. - Can you read pid/vid correctly, and which way you would like to match your ulpi device, pid/vid or using device tree, see ulpi_match -- Best Regards, Peter Chen