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b=cTy8VpLiHGli3eAUSBS1rdZn9wtKChUliIfxlvDX7VQJOt8jXv0pGEDb5jjq3nY8yG dDiQ6KanTbVgnjZd9anI/Bzq/EA+8VIfPH9CyRhFwlC5qWcfzTmd8rVT+jTljLJDDN2F oVgA/yR+SirxVaQjL4Ra97rHvJj0XjFl5Wn+iBfrkDyUvHqi/yE4Wd0UK/Ow50M6VgZH 80/bweCAB+f5jYSzqSISn1YPsIB4Lx6o0DUFiNfg4wRJWJrb/orj3nTQjBnSsRbZv7mQ YMf5Gr0EOrL18vz3pgORan2/pOLw2o6njronAy4aOo1IDiRe/yUp6Hm45INVJOXhbYPe Y8Jg== X-Gm-Message-State: APjAAAUukiC4yojSlHehPoGNqvMUlwvIdBq+mz1hSisJ1bvhtJxbs1LD KSU/9OEQOFngoWOR2MyL9UzwPQ== X-Google-Smtp-Source: APXvYqyesrrZw3c6wnWIYKskRfQzbmGey2GoXlGuQ2obakNmbEU9VplgKM4DwUU5orVX5Nf76vXgJw== X-Received: by 2002:a62:2703:: with SMTP id n3mr81869816pfn.199.1558374975284; Mon, 20 May 2019 10:56:15 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:1:24fa:e766:52c9:e3b2]) by smtp.gmail.com with ESMTPSA id o2sm16852723pgq.1.2019.05.20.10.56.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 20 May 2019 10:56:14 -0700 (PDT) From: Douglas Anderson To: Minas Harutyunyan , Felipe Balbi , heiko@sntech.de Subject: [PATCH v3 2/3] USB: dwc2: Don't turn off the usbphy in suspend if wakeup is enabled Date: Mon, 20 May 2019 10:56:04 -0700 Message-Id: <20190520175605.2405-3-dianders@chromium.org> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog In-Reply-To: <20190520175605.2405-1-dianders@chromium.org> References: <20190520175605.2405-1-dianders@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190520_105616_545650_6FD5860F X-CRM114-Status: GOOD ( 23.84 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Wahren , Artur Petrosyan , Amelie Delaunay , Randy Li , amstan@chromium.org, Greg Kroah-Hartman , zyw@rock-chips.com, linux-usb@vger.kernel.org, Douglas Anderson , linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, mka@chromium.org, Alan Stern , Elaine Zhang , jwerner@chromium.org, William Wu , ryandcase@chromium.org Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP If the 'snps,need-phy-for-wake' is set in the device tree then: - We know that we can wakeup, so call device_set_wakeup_capable(). The USB core will use this knowledge to enable wakeup by default. - We know that we should keep the PHY on during suspend if something on our root hub needs remote wakeup. This requires the patch (USB: Export usb_wakeup_enabled_descendants()). Note that we don't keep the PHY on at suspend time if it's not needed because it would be a power draw. If we later find some users of dwc2 that can support wakeup without keeping the PHY on we may want to add a way to call device_set_wakeup_capable() without keeping the PHY on at suspend time. Signed-off-by: Douglas Anderson Signed-off-by: Chris Zhong --- For relevant prior discussion of this idea, see: https://lkml.kernel.org/r/1436207224-21849-4-git-send-email-dianders@chromium.org If I'm reading all the responses correctly folks were of the opinion that this patch is still the right way to go. Changes in v3: - Fixed kbuild test robot error. Changes in v2: - Rebased to mainline atop rk3288 remote wake quirk series. drivers/usb/dwc2/core.h | 8 ++++++++ drivers/usb/dwc2/hcd.c | 19 +++++++++++++++++++ drivers/usb/dwc2/platform.c | 23 ++++++++++++++++++++--- 3 files changed, 47 insertions(+), 3 deletions(-) diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h index 152ac41dfb2d..d08d070a0fb6 100644 --- a/drivers/usb/dwc2/core.h +++ b/drivers/usb/dwc2/core.h @@ -861,6 +861,9 @@ struct dwc2_hregs_backup { * @hibernated: True if core is hibernated * @reset_phy_on_wake: Quirk saying that we should assert PHY reset on a * remote wakeup. + * @phy_off_for_suspend: Status of whether we turned the PHY off at suspend. + * @need_phy_for_wake: Quirk saying that we should keep the PHY on at + * suspend if we need USB to wake us up. * @frame_number: Frame number read from the core. For both device * and host modes. The value ranges are from 0 * to HFNUM_MAX_FRNUM. @@ -1049,6 +1052,8 @@ struct dwc2_hsotg { unsigned int ll_hw_enabled:1; unsigned int hibernated:1; unsigned int reset_phy_on_wake:1; + unsigned int need_phy_for_wake:1; + unsigned int phy_off_for_suspend:1; u16 frame_number; struct phy *phy; @@ -1438,6 +1443,7 @@ int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg); int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg); int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup, int reset); +bool dwc2_host_can_poweroff_phy(struct dwc2_hsotg *dwc2); static inline void dwc2_host_schedule_phy_reset(struct dwc2_hsotg *hsotg) { schedule_work(&hsotg->phy_reset_work); } #else @@ -1463,6 +1469,8 @@ static inline int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg) static inline int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup, int reset) { return 0; } +static inline bool dwc2_host_can_poweroff_phy(struct dwc2_hsotg *dwc2) +{ return false; } static inline void dwc2_host_schedule_phy_reset(struct dwc2_hsotg *hsotg) {} #endif diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index b50ec3714fd8..cc918fe7ddb8 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -5578,3 +5578,22 @@ int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup, dev_dbg(hsotg->dev, "Host hibernation restore complete\n"); return ret; } + +bool dwc2_host_can_poweroff_phy(struct dwc2_hsotg *dwc2) +{ + struct usb_device *root_hub = dwc2_hsotg_to_hcd(dwc2)->self.root_hub; + + /* If the controller isn't allowed to wakeup then we can power off. */ + if (!device_may_wakeup(dwc2->dev)) + return true; + + /* + * We don't want to power off the PHY if something under the + * root hub has wakeup enabled. + */ + if (usb_wakeup_enabled_descendants(root_hub)) + return false; + + /* No reason to keep the PHY powered, so allow poweroff */ + return true; +} diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index d10a7f8daec3..3e6c3c8a32ff 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -447,6 +447,10 @@ static int dwc2_driver_probe(struct platform_device *dev) if (retval) goto error; + hsotg->need_phy_for_wake = + of_property_read_bool(dev->dev.of_node, + "snps,need-phy-for-wake"); + /* * Reset before dwc2_get_hwparams() then it could get power-on real * reset value form registers. @@ -478,6 +482,14 @@ static int dwc2_driver_probe(struct platform_device *dev) hsotg->gadget_enabled = 1; } + /* + * If we need PHY for wakeup we must be wakeup capable. + * When we have a device that can wake without the PHY we + * can adjust this condition. + */ + if (hsotg->need_phy_for_wake) + device_set_wakeup_capable(&dev->dev, true); + hsotg->reset_phy_on_wake = of_property_read_bool(dev->dev.of_node, "snps,reset-phy-on-wake"); @@ -516,13 +528,17 @@ static int dwc2_driver_probe(struct platform_device *dev) static int __maybe_unused dwc2_suspend(struct device *dev) { struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev); + bool is_device_mode = dwc2_is_device_mode(dwc2); int ret = 0; - if (dwc2_is_device_mode(dwc2)) + if (is_device_mode) dwc2_hsotg_suspend(dwc2); - if (dwc2->ll_hw_enabled) + if (dwc2->ll_hw_enabled && + (is_device_mode || dwc2_host_can_poweroff_phy(dwc2))) { ret = __dwc2_lowlevel_hw_disable(dwc2); + dwc2->phy_off_for_suspend = true; + } return ret; } @@ -532,11 +548,12 @@ static int __maybe_unused dwc2_resume(struct device *dev) struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev); int ret = 0; - if (dwc2->ll_hw_enabled) { + if (dwc2->phy_off_for_suspend && dwc2->ll_hw_enabled) { ret = __dwc2_lowlevel_hw_enable(dwc2); if (ret) return ret; } + dwc2->phy_off_for_suspend = false; if (dwc2_is_device_mode(dwc2)) ret = dwc2_hsotg_resume(dwc2);