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usb: dwc3: core: Fix ULPI PHYs and prevent phy_get/ulpi_init during suspend/resume 

In order for ULPI PHYs to work, dwc3_phy_setup() and dwc3_ulpi_init()
must be doene before dwc3_core_get_phy().

commit 541768b08a ("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: 541768b08a ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys")
Fixes: f54edb539c ("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>
This commit is contained in:
Roger Quadros 2018-02-12 15:30:08 +02:00 committed by Felipe Balbi
parent 8874ae5f15
commit 98112041bc
2 changed files with 43 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/usb/dwc3/core.c
View File

@ -486,6 +486,22 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc)
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
@ -497,7 +513,6 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc)
static int dwc3_phy_setup(struct dwc3 *dwc)
{
u32 reg;
int ret;
reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
@ -568,9 +583,6 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
}
/* FALLTHROUGH */
case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
ret = dwc3_ulpi_init(dwc);
if (ret)
return ret;
/* FALLTHROUGH */
default:
break;
@ -727,6 +739,7 @@ static void dwc3_core_setup_global_control(struct dwc3 *dwc)
}
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
@ -758,18 +771,28 @@ static int dwc3_core_init(struct dwc3 *dwc)
dwc->maximum_speed = USB_SPEED_HIGH;
}
ret = dwc3_core_get_phy(dwc);
if (ret)
goto err0;
ret = dwc3_core_soft_reset(dwc);
if (ret)
goto err0;
ret = dwc3_phy_setup(dwc);
if (ret)
goto err0;
if (!dwc->ulpi_ready) {
ret = dwc3_core_ulpi_init(dwc);
if (ret)
goto err0;
dwc->ulpi_ready = true;
}
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 err0a;
dwc3_core_setup_global_control(dwc);
dwc3_core_num_eps(dwc);
@ -841,6 +864,9 @@ err1:
phy_exit(dwc->usb2_generic_phy);
phy_exit(dwc->usb3_generic_phy);
err0a:
dwc3_ulpi_exit(dwc);
err0:
return ret;
}
@ -1235,7 +1261,6 @@ err4:
err3:
dwc3_free_event_buffers(dwc);
dwc3_ulpi_exit(dwc);
err2:
pm_runtime_allow(&pdev->dev);

5
drivers/usb/dwc3/core.h
View File

@ -797,7 +797,9 @@ 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
* @u2sel: parameter from Set SEL request.
* @u2pel: parameter from Set SEL request.
* @u1sel: parameter from Set SEL request.
@ -895,7 +897,10 @@ 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;