4.14-stable review patch. If anyone has any objections, please let me know.
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From: Roger Quadros rogerq@ti.com
commit 98112041bcca164676367e261c8c1073ef70cb51 upstream.
In order for ULPI PHYs to work, dwc3_phy_setup() and dwc3_ulpi_init() must be doene before dwc3_core_get_phy().
commit 541768b08a40 ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys") broke this.
The other issue is that dwc3_core_get_phy() and dwc3_ulpi_init() should be called only once during the life cycle of the driver. However, as dwc3_core_init() is called during system suspend/resume it will result in multiple calls to dwc3_core_get_phy() and dwc3_ulpi_init() which is wrong.
Fix this by moving dwc3_ulpi_init() out of dwc3_phy_setup() into dwc3_core_ulpi_init(). Use a flag 'ulpi_ready' to ensure that dwc3_core_ulpi_init() is called only once from dwc3_core_init().
Use another flag 'phys_ready' to call dwc3_core_get_phy() only once from dwc3_core_init().
Fixes: 541768b08a40 ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys") Fixes: f54edb539c11 ("usb: dwc3: core: initialize ULPI before trying to get the PHY") Cc: linux-stable stable@vger.kernel.org # >= v4.13 Signed-off-by: Roger Quadros rogerq@ti.com Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com Signed-off-by: Sudip Mukherjee sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/core.c | 47 ++++++++++++++++++++++++++++++++++++----------- drivers/usb/dwc3/core.h | 5 +++++ 2 files changed, 41 insertions(+), 11 deletions(-)
--- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -511,6 +511,22 @@ static void dwc3_cache_hwparams(struct d parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8); }
+static int dwc3_core_ulpi_init(struct dwc3 *dwc) +{ + int intf; + int ret = 0; + + intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3); + + if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI || + (intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI && + dwc->hsphy_interface && + !strncmp(dwc->hsphy_interface, "ulpi", 4))) + ret = dwc3_ulpi_init(dwc); + + return ret; +} + /** * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core * @dwc: Pointer to our controller context structure @@ -522,7 +538,6 @@ static void dwc3_cache_hwparams(struct d static int dwc3_phy_setup(struct dwc3 *dwc) { u32 reg; - int ret;
reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
@@ -593,9 +608,6 @@ static int dwc3_phy_setup(struct dwc3 *d } /* FALLTHROUGH */ case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI: - ret = dwc3_ulpi_init(dwc); - if (ret) - return ret; /* FALLTHROUGH */ default: break; @@ -752,6 +764,7 @@ static void dwc3_core_setup_global_contr }
static int dwc3_core_get_phy(struct dwc3 *dwc); +static int dwc3_core_ulpi_init(struct dwc3 *dwc);
/** * dwc3_core_init - Low-level initialization of DWC3 Core @@ -783,17 +796,27 @@ static int dwc3_core_init(struct dwc3 *d dwc->maximum_speed = USB_SPEED_HIGH; }
- ret = dwc3_core_get_phy(dwc); + ret = dwc3_phy_setup(dwc); if (ret) goto err0;
- ret = dwc3_core_soft_reset(dwc); - if (ret) - goto err0; + if (!dwc->ulpi_ready) { + ret = dwc3_core_ulpi_init(dwc); + if (ret) + goto err0; + dwc->ulpi_ready = true; + }
- ret = dwc3_phy_setup(dwc); + if (!dwc->phys_ready) { + ret = dwc3_core_get_phy(dwc); + if (ret) + goto err0a; + dwc->phys_ready = true; + } + + ret = dwc3_core_soft_reset(dwc); if (ret) - goto err0; + goto err0a;
dwc3_core_setup_global_control(dwc); dwc3_core_num_eps(dwc); @@ -866,6 +889,9 @@ err1: phy_exit(dwc->usb2_generic_phy); phy_exit(dwc->usb3_generic_phy);
+err0a: + dwc3_ulpi_exit(dwc); + err0: return ret; } @@ -1256,7 +1282,6 @@ err4:
err3: dwc3_free_event_buffers(dwc); - dwc3_ulpi_exit(dwc);
err2: pm_runtime_allow(&pdev->dev); --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -805,7 +805,9 @@ struct dwc3_scratchpad_array { * @usb3_phy: pointer to USB3 PHY * @usb2_generic_phy: pointer to USB2 PHY * @usb3_generic_phy: pointer to USB3 PHY + * @phys_ready: flag to indicate that PHYs are ready * @ulpi: pointer to ulpi interface + * @ulpi_ready: flag to indicate that ULPI is initialized * @isoch_delay: wValue from Set Isochronous Delay request; * @u2sel: parameter from Set SEL request. * @u2pel: parameter from Set SEL request. @@ -903,7 +905,10 @@ struct dwc3 { struct phy *usb2_generic_phy; struct phy *usb3_generic_phy;
+ bool phys_ready; + struct ulpi *ulpi; + bool ulpi_ready;
void __iomem *regs; size_t regs_size;