From: Roger Quadros <rogerq@ti.com> To: <kishon@ti.com>, <tony@atomide.com> Cc: <robh+dt@kernel.org>, <nsekhar@ti.com>, <linux-omap@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, Roger Quadros <rogerq@ti.com> Subject: [PATCH 1/3] phy: omap-usb2: support suspend/resume Date: Tue, 23 Aug 2016 11:57:39 +0300 [thread overview] Message-ID: <1471942661-1728-2-git-send-email-rogerq@ti.com> (raw) In-Reply-To: <1471942661-1728-1-git-send-email-rogerq@ti.com> From: Sekhar Nori <nsekhar@ti.com> Relying on PM-ops for shutting down PHY clocks was a bad idea since the users (e.g. USB DWC3) might not have been suspended by then. Get rid of all PM-ops. It is the sole responsibility of the PHY user to properly turn OFF and de-initialize the PHY as part of its suspend routine. Enable/disable PHY clock as part of ->init()/->exit() call respectively. With this phy_init() and phy_exit() can be called by PHY user during suspend/resume. This is similar to what is done for ti-pipe3 driver. See 31c8954efb1b ("phy: ti-pipe3: fix suspend") The pm_runtime_enable() call in omap_usb2_probe() is still required because without it, phy_create() will not enable runtime PM on the phy device it creates and phy_init() will not call pm_runtime_get_sync(). Without pm_runtime_get_sync(), ocp2scp hwmod will _not_ enable the IP and, thus, we will have abort exceptions. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Roger Quadros <rogerq@ti.com> --- drivers/phy/phy-omap-usb2.c | 100 ++++++++++++++++++++------------------------ 1 file changed, 46 insertions(+), 54 deletions(-) diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c index c134989..fe909fd 100644 --- a/drivers/phy/phy-omap-usb2.c +++ b/drivers/phy/phy-omap-usb2.c @@ -133,11 +133,49 @@ static int omap_usb_power_on(struct phy *x) return omap_usb_phy_power(phy, true); } +static int omap_usb2_disable_clocks(struct omap_usb *phy) +{ + clk_disable(phy->wkupclk); + if (!IS_ERR(phy->optclk)) + clk_disable(phy->optclk); + + return 0; +} + +static int omap_usb2_enable_clocks(struct omap_usb *phy) +{ + int ret; + + ret = clk_enable(phy->wkupclk); + if (ret < 0) { + dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); + goto err0; + } + + if (!IS_ERR(phy->optclk)) { + ret = clk_enable(phy->optclk); + if (ret < 0) { + dev_err(phy->dev, "Failed to enable optclk %d\n", ret); + goto err1; + } + } + + return 0; + +err1: + clk_disable(phy->wkupclk); + +err0: + return ret; +} + static int omap_usb_init(struct phy *x) { struct omap_usb *phy = phy_get_drvdata(x); u32 val; + omap_usb2_enable_clocks(phy); + if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) { /* * @@ -155,8 +193,16 @@ static int omap_usb_init(struct phy *x) return 0; } +static int omap_usb_exit(struct phy *x) +{ + struct omap_usb *phy = phy_get_drvdata(x); + + return omap_usb2_disable_clocks(phy); +} + static const struct phy_ops ops = { .init = omap_usb_init, + .exit = omap_usb_exit, .power_on = omap_usb_power_on, .power_off = omap_usb_power_off, .owner = THIS_MODULE, @@ -376,65 +422,11 @@ static int omap_usb2_remove(struct platform_device *pdev) return 0; } -#ifdef CONFIG_PM - -static int omap_usb2_runtime_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct omap_usb *phy = platform_get_drvdata(pdev); - - clk_disable(phy->wkupclk); - if (!IS_ERR(phy->optclk)) - clk_disable(phy->optclk); - - return 0; -} - -static int omap_usb2_runtime_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct omap_usb *phy = platform_get_drvdata(pdev); - int ret; - - ret = clk_enable(phy->wkupclk); - if (ret < 0) { - dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); - goto err0; - } - - if (!IS_ERR(phy->optclk)) { - ret = clk_enable(phy->optclk); - if (ret < 0) { - dev_err(phy->dev, "Failed to enable optclk %d\n", ret); - goto err1; - } - } - - return 0; - -err1: - clk_disable(phy->wkupclk); - -err0: - return ret; -} - -static const struct dev_pm_ops omap_usb2_pm_ops = { - SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume, - NULL) -}; - -#define DEV_PM_OPS (&omap_usb2_pm_ops) -#else -#define DEV_PM_OPS NULL -#endif - static struct platform_driver omap_usb2_driver = { .probe = omap_usb2_probe, .remove = omap_usb2_remove, .driver = { .name = "omap-usb2", - .pm = DEV_PM_OPS, .of_match_table = omap_usb2_id_table, }, }; -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Roger Quadros <rogerq@ti.com> To: kishon@ti.com, tony@atomide.com Cc: robh+dt@kernel.org, nsekhar@ti.com, linux-omap@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Roger Quadros <rogerq@ti.com> Subject: [PATCH 1/3] phy: omap-usb2: support suspend/resume Date: Tue, 23 Aug 2016 11:57:39 +0300 [thread overview] Message-ID: <1471942661-1728-2-git-send-email-rogerq@ti.com> (raw) In-Reply-To: <1471942661-1728-1-git-send-email-rogerq@ti.com> From: Sekhar Nori <nsekhar@ti.com> Relying on PM-ops for shutting down PHY clocks was a bad idea since the users (e.g. USB DWC3) might not have been suspended by then. Get rid of all PM-ops. It is the sole responsibility of the PHY user to properly turn OFF and de-initialize the PHY as part of its suspend routine. Enable/disable PHY clock as part of ->init()/->exit() call respectively. With this phy_init() and phy_exit() can be called by PHY user during suspend/resume. This is similar to what is done for ti-pipe3 driver. See 31c8954efb1b ("phy: ti-pipe3: fix suspend") The pm_runtime_enable() call in omap_usb2_probe() is still required because without it, phy_create() will not enable runtime PM on the phy device it creates and phy_init() will not call pm_runtime_get_sync(). Without pm_runtime_get_sync(), ocp2scp hwmod will _not_ enable the IP and, thus, we will have abort exceptions. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Roger Quadros <rogerq@ti.com> --- drivers/phy/phy-omap-usb2.c | 100 ++++++++++++++++++++------------------------ 1 file changed, 46 insertions(+), 54 deletions(-) diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c index c134989..fe909fd 100644 --- a/drivers/phy/phy-omap-usb2.c +++ b/drivers/phy/phy-omap-usb2.c @@ -133,11 +133,49 @@ static int omap_usb_power_on(struct phy *x) return omap_usb_phy_power(phy, true); } +static int omap_usb2_disable_clocks(struct omap_usb *phy) +{ + clk_disable(phy->wkupclk); + if (!IS_ERR(phy->optclk)) + clk_disable(phy->optclk); + + return 0; +} + +static int omap_usb2_enable_clocks(struct omap_usb *phy) +{ + int ret; + + ret = clk_enable(phy->wkupclk); + if (ret < 0) { + dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); + goto err0; + } + + if (!IS_ERR(phy->optclk)) { + ret = clk_enable(phy->optclk); + if (ret < 0) { + dev_err(phy->dev, "Failed to enable optclk %d\n", ret); + goto err1; + } + } + + return 0; + +err1: + clk_disable(phy->wkupclk); + +err0: + return ret; +} + static int omap_usb_init(struct phy *x) { struct omap_usb *phy = phy_get_drvdata(x); u32 val; + omap_usb2_enable_clocks(phy); + if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) { /* * @@ -155,8 +193,16 @@ static int omap_usb_init(struct phy *x) return 0; } +static int omap_usb_exit(struct phy *x) +{ + struct omap_usb *phy = phy_get_drvdata(x); + + return omap_usb2_disable_clocks(phy); +} + static const struct phy_ops ops = { .init = omap_usb_init, + .exit = omap_usb_exit, .power_on = omap_usb_power_on, .power_off = omap_usb_power_off, .owner = THIS_MODULE, @@ -376,65 +422,11 @@ static int omap_usb2_remove(struct platform_device *pdev) return 0; } -#ifdef CONFIG_PM - -static int omap_usb2_runtime_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct omap_usb *phy = platform_get_drvdata(pdev); - - clk_disable(phy->wkupclk); - if (!IS_ERR(phy->optclk)) - clk_disable(phy->optclk); - - return 0; -} - -static int omap_usb2_runtime_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct omap_usb *phy = platform_get_drvdata(pdev); - int ret; - - ret = clk_enable(phy->wkupclk); - if (ret < 0) { - dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); - goto err0; - } - - if (!IS_ERR(phy->optclk)) { - ret = clk_enable(phy->optclk); - if (ret < 0) { - dev_err(phy->dev, "Failed to enable optclk %d\n", ret); - goto err1; - } - } - - return 0; - -err1: - clk_disable(phy->wkupclk); - -err0: - return ret; -} - -static const struct dev_pm_ops omap_usb2_pm_ops = { - SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume, - NULL) -}; - -#define DEV_PM_OPS (&omap_usb2_pm_ops) -#else -#define DEV_PM_OPS NULL -#endif - static struct platform_driver omap_usb2_driver = { .probe = omap_usb2_probe, .remove = omap_usb2_remove, .driver = { .name = "omap-usb2", - .pm = DEV_PM_OPS, .of_match_table = omap_usb2_id_table, }, }; -- 2.7.4
next prev parent reply other threads:[~2016-08-23 8:57 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-08-23 8:57 [PATCH 0/3] phy: omap-usb2: Fixes for v4.9 Roger Quadros 2016-08-23 8:57 ` Roger Quadros 2016-08-23 8:57 ` Roger Quadros [this message] 2016-08-23 8:57 ` [PATCH 1/3] phy: omap-usb2: support suspend/resume Roger Quadros 2016-08-23 8:57 ` [PATCH 2/3] dt-bindings: phy: ti: add documentation for ti,dra7x-usb2 Roger Quadros 2016-08-23 8:57 ` Roger Quadros 2016-08-23 20:03 ` Rob Herring 2016-08-23 20:03 ` Rob Herring 2016-08-23 8:57 ` [PATCH 3/3] ARM: dts: dra7: workaround silicon limitation i845 Roger Quadros 2016-08-23 8:57 ` Roger Quadros 2016-08-26 15:28 ` Tony Lindgren 2016-09-02 12:17 ` [PATCH 0/3] phy: omap-usb2: Fixes for v4.9 Kishon Vijay Abraham I 2016-09-02 12:17 ` Kishon Vijay Abraham I
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=1471942661-1728-2-git-send-email-rogerq@ti.com \ --to=rogerq@ti.com \ --cc=devicetree@vger.kernel.org \ --cc=kishon@ti.com \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-omap@vger.kernel.org \ --cc=nsekhar@ti.com \ --cc=robh+dt@kernel.org \ --cc=tony@atomide.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.