From patchwork Mon Dec 7 13:03:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 340199 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39AE6C433FE for ; Mon, 7 Dec 2020 13:06:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC88623428 for ; Mon, 7 Dec 2020 13:06:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726226AbgLGNGA (ORCPT ); Mon, 7 Dec 2020 08:06:00 -0500 Received: from aposti.net ([89.234.176.197]:35236 "EHLO aposti.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725874AbgLGNGA (ORCPT ); Mon, 7 Dec 2020 08:06:00 -0500 From: Paul Cercueil To: Bin Liu , Greg Kroah-Hartman Cc: od@zcrc.me, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Paul Cercueil Subject: [PATCH 3/4] usb: musb: Allow running without a PHY Date: Mon, 7 Dec 2020 13:03:31 +0000 Message-Id: <20201207130332.120681-3-paul@crapouillou.net> In-Reply-To: <20201207130332.120681-1-paul@crapouillou.net> References: <20201207130332.120681-1-paul@crapouillou.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Some platforms (e.g. JZ4740) can run without a PHY. Modify the core so that musb->xceiv is never deferenced without being checked first. Signed-off-by: Paul Cercueil --- drivers/usb/musb/musb_core.c | 2 +- drivers/usb/musb/musb_core.h | 12 ++++++++++-- drivers/usb/musb/musb_gadget.c | 21 +++++++++++++-------- drivers/usb/musb/musb_host.c | 8 ++++++-- drivers/usb/musb/musb_virthub.c | 11 +++++------ 5 files changed, 35 insertions(+), 19 deletions(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 8e8861955545..232218d74b95 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2431,7 +2431,7 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl) else musb->io.set_toggle = musb_default_set_toggle; - if (!musb->xceiv->io_ops) { + if (IS_ENABLED(CONFIG_USB_PHY) && musb->xceiv && !musb->xceiv->io_ops) { musb->xceiv->io_dev = musb->controller; musb->xceiv->io_priv = musb->mregs; musb->xceiv->io_ops = &musb_ulpi_access; diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h index 363481df1ceb..f9f058bb5dda 100644 --- a/drivers/usb/musb/musb_core.h +++ b/drivers/usb/musb/musb_core.h @@ -339,6 +339,8 @@ struct musb { struct usb_phy *xceiv; struct phy *phy; + enum usb_otg_state otg_state; + int nIrq; unsigned irq_wake:1; @@ -595,12 +597,18 @@ static inline void musb_platform_clear_ep_rxintr(struct musb *musb, int epnum) static inline void musb_set_state(struct musb *musb, enum usb_otg_state otg_state) { - musb->xceiv->otg->state = otg_state; + if (musb->xceiv) + musb->xceiv->otg->state = otg_state; + else + musb->otg_state = otg_state; } static inline enum usb_otg_state musb_get_state(struct musb *musb) { - return musb->xceiv->otg->state; + if (musb->xceiv) + return musb->xceiv->otg->state; + + return musb->otg_state; } static inline const char *musb_otg_state_string(struct musb *musb) diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index ba312b43b895..f3592c7a5c5e 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -1547,9 +1547,11 @@ static int musb_gadget_wakeup(struct usb_gadget *gadget) break; } - spin_unlock_irqrestore(&musb->lock, flags); - otg_start_srp(musb->xceiv->otg); - spin_lock_irqsave(&musb->lock, flags); + if (musb->xceiv) { + spin_unlock_irqrestore(&musb->lock, flags); + otg_start_srp(musb->xceiv->otg); + spin_lock_irqsave(&musb->lock, flags); + } /* Block idling for at least 1s */ musb_platform_try_idle(musb, @@ -1623,7 +1625,7 @@ static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA) { struct musb *musb = gadget_to_musb(gadget); - if (!musb->xceiv->set_power) + if (!musb->xceiv || !musb->xceiv->set_power) return -EOPNOTSUPP; return usb_phy_set_power(musb->xceiv, mA); } @@ -1829,7 +1831,6 @@ static int musb_gadget_start(struct usb_gadget *g, struct usb_gadget_driver *driver) { struct musb *musb = gadget_to_musb(g); - struct usb_otg *otg = musb->xceiv->otg; unsigned long flags; int retval = 0; @@ -1846,7 +1847,9 @@ static int musb_gadget_start(struct usb_gadget *g, spin_lock_irqsave(&musb->lock, flags); musb->is_active = 1; - otg_set_peripheral(otg, &musb->g); + if (musb->xceiv) + otg_set_peripheral(musb->xceiv->otg, &musb->g); + musb_set_state(musb, OTG_STATE_B_IDLE); spin_unlock_irqrestore(&musb->lock, flags); @@ -1856,7 +1859,7 @@ static int musb_gadget_start(struct usb_gadget *g, * handles power budgeting ... this way also * ensures HdrcStart is indirectly called. */ - if (musb->xceiv->last_event == USB_EVENT_ID) + if (musb->xceiv && musb->xceiv->last_event == USB_EVENT_ID) musb_platform_set_vbus(musb, 1); pm_runtime_mark_last_busy(musb->controller); @@ -1894,7 +1897,9 @@ static int musb_gadget_stop(struct usb_gadget *g) musb_set_state(musb, OTG_STATE_UNDEFINED); musb_stop(musb); - otg_set_peripheral(musb->xceiv->otg, NULL); + + if (musb->xceiv) + otg_set_peripheral(musb->xceiv->otg, NULL); musb->is_active = 0; musb->gadget_driver = NULL; diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index 7db464e50cf9..d8793f8df25c 100644 --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -2728,10 +2728,14 @@ int musb_host_setup(struct musb *musb, int power_budget) MUSB_HST_MODE(musb); musb_set_state(musb, OTG_STATE_A_IDLE); } - otg_set_host(musb->xceiv->otg, &hcd->self); + + if (musb->xceiv) { + otg_set_host(musb->xceiv->otg, &hcd->self); + musb->xceiv->otg->host = &hcd->self; + } + /* don't support otg protocols */ hcd->self.otg_port = 0; - musb->xceiv->otg->host = &hcd->self; hcd->power_budget = 2 * (power_budget ? : 250); hcd->skip_phy_initialization = 1; diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c index 7eb929d75280..2b2164e028b3 100644 --- a/drivers/usb/musb/musb_virthub.c +++ b/drivers/usb/musb/musb_virthub.c @@ -50,7 +50,6 @@ void musb_host_finish_resume(struct work_struct *work) int musb_port_suspend(struct musb *musb, bool do_suspend) { - struct usb_otg *otg = musb->xceiv->otg; u8 power; void __iomem *mbase = musb->mregs; @@ -88,7 +87,8 @@ int musb_port_suspend(struct musb *musb, bool do_suspend) switch (musb_get_state(musb)) { case OTG_STATE_A_HOST: musb_set_state(musb, OTG_STATE_A_SUSPEND); - musb->is_active = otg->host->b_hnp_enable; + musb->is_active = musb->xceiv && + musb->xceiv->otg->host->b_hnp_enable; if (musb->is_active) mod_timer(&musb->otg_timer, jiffies + msecs_to_jiffies( @@ -97,7 +97,8 @@ int musb_port_suspend(struct musb *musb, bool do_suspend) break; case OTG_STATE_B_HOST: musb_set_state(musb, OTG_STATE_B_WAIT_ACON); - musb->is_active = otg->host->b_hnp_enable; + musb->is_active = musb->xceiv && + musb->xceiv->otg->host->b_hnp_enable; musb_platform_try_idle(musb, 0); break; default: @@ -196,8 +197,6 @@ void musb_port_reset(struct musb *musb, bool do_reset) void musb_root_disconnect(struct musb *musb) { - struct usb_otg *otg = musb->xceiv->otg; - musb->port1_status = USB_PORT_STAT_POWER | (USB_PORT_STAT_C_CONNECTION << 16); @@ -206,7 +205,7 @@ void musb_root_disconnect(struct musb *musb) switch (musb_get_state(musb)) { case OTG_STATE_A_SUSPEND: - if (otg->host->b_hnp_enable) { + if (musb->xceiv && musb->xceiv->otg->host->b_hnp_enable) { musb_set_state(musb, OTG_STATE_A_PERIPHERAL); musb->g.is_a_peripheral = 1; break;