From c499ff71ff2a281366c6ec7a904c547d806cbcd1 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Mon, 16 May 2016 10:49:01 +0300 Subject: [PATCH] usb: dwc3: core: re-factor init and exit paths The idea of this patch is for dwc3_core_init() to abstract all the details about how to initialize dwc3 and dwc3_core_exit() to do the same for teardown. With this, we can simplify suspend/resume operations by a large margin and always know that we're going to start dwc3 from a known starting point. Signed-off-by: Felipe Balbi --- drivers/usb/dwc3/core.c | 118 ++++++++++++++++++++++++------------------------ 1 file changed, 60 insertions(+), 58 deletions(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 1f4ac355f384..cbdefbb3d302 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -506,6 +506,21 @@ static int dwc3_phy_setup(struct dwc3 *dwc) return 0; } +static void dwc3_core_exit(struct dwc3 *dwc) +{ + dwc3_event_buffers_cleanup(dwc); + + usb_phy_shutdown(dwc->usb2_phy); + usb_phy_shutdown(dwc->usb3_phy); + phy_exit(dwc->usb2_generic_phy); + phy_exit(dwc->usb3_generic_phy); + + usb_phy_set_suspend(dwc->usb2_phy, 1); + usb_phy_set_suspend(dwc->usb3_phy, 1); + phy_power_off(dwc->usb2_generic_phy); + phy_power_off(dwc->usb3_generic_phy); +} + /** * dwc3_core_init - Low-level initialization of DWC3 Core * @dwc: Pointer to our controller context structure @@ -555,6 +570,10 @@ static int dwc3_core_init(struct dwc3 *dwc) if (ret) goto err0; + ret = dwc3_phy_setup(dwc); + if (ret) + goto err0; + reg = dwc3_readl(dwc->regs, DWC3_GCTL); reg &= ~DWC3_GCTL_SCALEDOWN_MASK; @@ -621,22 +640,45 @@ static int dwc3_core_init(struct dwc3 *dwc) if (dwc->revision < DWC3_REVISION_190A) reg |= DWC3_GCTL_U2RSTECN; - dwc3_core_num_eps(dwc); - dwc3_writel(dwc->regs, DWC3_GCTL, reg); - ret = dwc3_alloc_scratch_buffers(dwc); - if (ret) - goto err1; + dwc3_core_num_eps(dwc); ret = dwc3_setup_scratch_buffers(dwc); if (ret) + goto err1; + + /* Adjust Frame Length */ + dwc3_frame_length_adjustment(dwc); + + usb_phy_set_suspend(dwc->usb2_phy, 0); + usb_phy_set_suspend(dwc->usb3_phy, 0); + ret = phy_power_on(dwc->usb2_generic_phy); + if (ret < 0) goto err2; + ret = phy_power_on(dwc->usb3_generic_phy); + if (ret < 0) + goto err3; + + ret = dwc3_event_buffers_setup(dwc); + if (ret) { + dev_err(dwc->dev, "failed to setup event buffers\n"); + goto err4; + } + return 0; +err4: + phy_power_off(dwc->usb2_generic_phy); + +err3: + phy_power_off(dwc->usb3_generic_phy); + err2: - dwc3_free_scratch_buffers(dwc); + usb_phy_set_suspend(dwc->usb2_phy, 1); + usb_phy_set_suspend(dwc->usb3_phy, 1); + dwc3_core_exit(dwc); err1: usb_phy_shutdown(dwc->usb2_phy); @@ -648,15 +690,6 @@ err0: return ret; } -static void dwc3_core_exit(struct dwc3 *dwc) -{ - dwc3_free_scratch_buffers(dwc); - usb_phy_shutdown(dwc->usb2_phy); - usb_phy_shutdown(dwc->usb3_phy); - phy_exit(dwc->usb2_generic_phy); - phy_exit(dwc->usb3_generic_phy); -} - static int dwc3_core_get_phy(struct dwc3 *dwc) { struct device *dev = dwc->dev; @@ -951,10 +984,6 @@ static int dwc3_probe(struct platform_device *pdev) platform_set_drvdata(pdev, dwc); dwc3_cache_hwparams(dwc); - ret = dwc3_phy_setup(dwc); - if (ret) - goto err0; - ret = dwc3_core_get_phy(dwc); if (ret) goto err0; @@ -975,7 +1004,7 @@ static int dwc3_probe(struct platform_device *pdev) if (ret) { dev_err(dwc->dev, "failed to allocate event buffers\n"); ret = -ENOMEM; - goto err1; + goto err0; } if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) @@ -986,10 +1015,14 @@ static int dwc3_probe(struct platform_device *pdev) if (dwc->dr_mode == USB_DR_MODE_UNKNOWN) dwc->dr_mode = USB_DR_MODE_OTG; + ret = dwc3_alloc_scratch_buffers(dwc); + if (ret) + goto err1; + ret = dwc3_core_init(dwc); if (ret) { dev_err(dev, "failed to initialize core\n"); - goto err1; + goto err2; } /* Check the maximum_speed parameter */ @@ -1019,47 +1052,20 @@ static int dwc3_probe(struct platform_device *pdev) break; } - /* Adjust Frame Length */ - dwc3_frame_length_adjustment(dwc); - - usb_phy_set_suspend(dwc->usb2_phy, 0); - usb_phy_set_suspend(dwc->usb3_phy, 0); - ret = phy_power_on(dwc->usb2_generic_phy); - if (ret < 0) - goto err2; - - ret = phy_power_on(dwc->usb3_generic_phy); - if (ret < 0) - goto err3; - - ret = dwc3_event_buffers_setup(dwc); - if (ret) { - dev_err(dwc->dev, "failed to setup event buffers\n"); - goto err4; - } - ret = dwc3_core_init_mode(dwc); if (ret) - goto err5; + goto err3; dwc3_debugfs_init(dwc); pm_runtime_allow(dev); return 0; -err5: - dwc3_event_buffers_cleanup(dwc); - -err4: - phy_power_off(dwc->usb3_generic_phy); - err3: - phy_power_off(dwc->usb2_generic_phy); + dwc3_event_buffers_cleanup(dwc); err2: - usb_phy_set_suspend(dwc->usb2_phy, 1); - usb_phy_set_suspend(dwc->usb3_phy, 1); - dwc3_core_exit(dwc); + dwc3_free_scratch_buffers(dwc); err1: dwc3_free_event_buffers(dwc); @@ -1090,17 +1096,13 @@ static int dwc3_remove(struct platform_device *pdev) dwc3_debugfs_exit(dwc); dwc3_core_exit_mode(dwc); - dwc3_event_buffers_cleanup(dwc); - dwc3_free_event_buffers(dwc); - - usb_phy_set_suspend(dwc->usb2_phy, 1); - usb_phy_set_suspend(dwc->usb3_phy, 1); - phy_power_off(dwc->usb2_generic_phy); - phy_power_off(dwc->usb3_generic_phy); dwc3_core_exit(dwc); dwc3_ulpi_exit(dwc); + dwc3_free_event_buffers(dwc); + dwc3_free_scratch_buffers(dwc); + pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); -- 2.11.0