From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Ivan T. Ivanov" Subject: Re: [PATCH 4/4] usb: chipidea: msm: Use USB PHY API to control PHY state Date: Wed, 11 Dec 2013 12:26:47 +0200 Message-ID: <1386757607.16289.42.camel@iivanov-dev.int.mm-sol.com> References: <1384176937-1658-1-git-send-email-iivanov@mm-sol.com> <1384176937-1658-5-git-send-email-iivanov@mm-sol.com> <20131111135931.GB21746@shlinux1.ap.freescale.net> <1384180569.23605.21.camel@iivanov-dev.int.mm-sol.com> <20131204053710.GA29552@shlinux1.ap.freescale.net> <1386149754.16040.21.camel@iivanov-dev.int.mm-sol.com> <20131204133858.GC1573@shlinux1.ap.freescale.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from ns.mm-sol.com ([37.157.136.199]:40324 "EHLO extserv.mm-sol.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750960Ab3LKK2Q (ORCPT ); Wed, 11 Dec 2013 05:28:16 -0500 In-Reply-To: <20131204133858.GC1573@shlinux1.ap.freescale.net> Sender: linux-arm-msm-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org To: Peter Chen Cc: alexander.shishkin@linux.intel.com, gregkh@linuxfoundation.org, rob.herring@calxeda.com, pawel.moll@arm.com, mark.rutland@arm.com, swarren@wwwdotorg.org, ijc+devicetree@hellion.org.uk, davidb@codeaurora.org, linux-usb@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Hi, On Wed, 2013-12-04 at 21:38 +0800, Peter Chen wrote: > On Wed, Dec 04, 2013 at 11:35:54AM +0200, Ivan T. Ivanov wrote: > > > > Hi Peter, > > > > On Wed, 2013-12-04 at 13:37 +0800, Peter Chen wrote: > > > On Mon, Nov 11, 2013 at 04:36:09PM +0200, Ivan T. Ivanov wrote: > > > > > > > > Hi Peter, > > > > > > > > On Mon, 2013-11-11 at 21:59 +0800, Peter Chen wrote: > > > > > On Mon, Nov 11, 2013 at 03:35:37PM +0200, Ivan T. Ivanov wrote: > > > > > > From: "Ivan T. Ivanov" > > > > > > > > > > > > PHY drivers keep track of the current state of the hardware, > > > > > > so don't change PHY settings under it. > > > > > > > > > > > > Signed-off-by: Ivan T. Ivanov > > > > > > --- > > > > > > drivers/usb/chipidea/ci_hdrc_msm.c | 9 ++------- > > > > > > 1 file changed, 2 insertions(+), 7 deletions(-) > > > > > > > > > > > > diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c > > > > > > index e9624f3..338b209 100644 > > > > > > --- a/drivers/usb/chipidea/ci_hdrc_msm.c > > > > > > +++ b/drivers/usb/chipidea/ci_hdrc_msm.c > > > > > > @@ -20,13 +20,11 @@ > > > > > > static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event) > > > > > > { > > > > > > struct device *dev = ci->gadget.dev.parent; > > > > > > - int val; > > > > > > > > > > > > switch (event) { > > > > > > case CI_HDRC_CONTROLLER_RESET_EVENT: > > > > > > dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n"); > > > > > > - writel(0, USB_AHBBURST); > > > > > > - writel(0, USB_AHBMODE); > > > > > > + usb_phy_init(ci->transceiver); > > > > > > > > > > It will reset the PHY, but your comment is "don't change PHY settings under it" > > > > > > > > :-). This function is exported by PHY drivers, so they will know how > > > > to handle this change. > > > > > > > > > > > > > > > break; > > > > > > case CI_HDRC_CONTROLLER_STOPPED_EVENT: > > > > > > dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n"); > > > > > > @@ -34,10 +32,7 @@ static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event) > > > > > > * Put the transceiver in non-driving mode. Otherwise host > > > > > > * may not detect soft-disconnection. > > > > > > */ > > > > > > - val = usb_phy_io_read(ci->transceiver, ULPI_FUNC_CTRL); > > > > > > - val &= ~ULPI_FUNC_CTRL_OPMODE_MASK; > > > > > > - val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING; > > > > > > - usb_phy_io_write(ci->transceiver, val, ULPI_FUNC_CTRL); > > > > > > + usb_phy_notify_disconnect(ci->transceiver, USB_SPEED_UNKNOWN); > > > > > > > > > > Where you have implemented .notify_disconnect? > > > > > I have not found it at your phy driver. > > > > > > > > Yep, I will post PHY driver changes shortly. Meanwhile this should > > > > not break existing board file based platforms, because not of them > > > > could be compiled (HTC Dream, Halibut Board) and DT based platforms > > > > are sill work in progress. > > > > > > > > > > Hi Ivan, I am going to apply this msm chipidea patchset, but the change > > > in this file is different with its original meaning. > > > > What did you mean? > > > > CI_HDRC_CONTROLLER_RESET_EVENT -> usb_phy_init() > > Take wherever actions are needed to put device in known state. ? > > At current code, it only sets two AHB parameters which should be only related > to controller but your patch init the whole PHY, look at msm_otg_reset, > it does many other things, like phy reset, controller reset, etc. > > Does the partial otg fsm at msm_otg_sm_work will be called or not? If it is > not called, then, it is OK you just use msm_otg_reset here. > > > > > CI_HDRC_CONTROLLER_STOPPED_EVENT -> usb_phy_notify_disconnect() > > Emitted after ci->driver->disconnect(&ci->gadget); > > I just see your [PATCH v4 14/15] usb: phy: msm: Handle disconnect events, > then, it is ok now. By the way, do I need to wait your phy patches are queued, > otherwise, it may not work? This driver is not working on MSM platforms more than year now, since "usb: gadget: ci13xxx: convert to platform device" Lets postpone this patch after changes to phy-drivers are ready. I will post rest of the patches with fixes for your comments shortly. > > > > > Probably I am missing something. > > > > > > > Have you > > > tested at existing platforms? > > > > > > I have 8074 based DragonBoard which I used for testing. > > CV Test Suite engine "Chapter 9 tests" are passing except > > "Halt Endpoint Test". > > I mean with your patch, the old non-dt platform can work or not? Regards, Ivan