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Message-ID: <1515667087-4110-1-git-send-email-rogerq@ti.com>
Date: Thu, 11 Jan 2018 12:38:07 +0200
From: Roger Quadros <rogerq@...com>
To: <balbi@...nel.org>
CC: <vigneshr@...com>, <gregkh@...uxfoundation.org>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Roger Quadros <rogerq@...com>,
"linux-stable # = v4 . 13" <stable@...r.kernel.org>
Subject: [PATCH v2] 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 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@...r.kernel.org> # >= v4.13
Signed-off-by: Roger Quadros <rogerq@...com>
---
Changelog:
v2:
- don't break ULPI case. Also take into consideration suspend/resume for ULPI case.
drivers/usb/dwc3/core.c | 47 ++++++++++++++++++++++++++++++++++++-----------
drivers/usb/dwc3/core.h | 5 +++++
2 files changed, 41 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 0783250..84382f6 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -482,6 +482,22 @@ 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
@@ -493,7 +509,6 @@ 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));
@@ -564,9 +579,6 @@ 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;
@@ -723,6 +735,7 @@ 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
@@ -754,17 +767,27 @@ static int dwc3_core_init(struct dwc3 *dwc)
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);
@@ -837,6 +860,9 @@ static int dwc3_core_init(struct dwc3 *dwc)
phy_exit(dwc->usb2_generic_phy);
phy_exit(dwc->usb3_generic_phy);
+err0a:
+ dwc3_ulpi_exit(dwc);
+
err0:
return ret;
}
@@ -1229,7 +1255,6 @@ static int dwc3_probe(struct platform_device *pdev)
err3:
dwc3_free_event_buffers(dwc);
- dwc3_ulpi_exit(dwc);
err2:
pm_runtime_allow(&pdev->dev);
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 4a4a4c9..6b202e3 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -795,7 +795,9 @@ 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.
@@ -893,7 +895,10 @@ 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;
--
cheers,
-roger
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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