From: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
Added ref_clk_per for writing to GUCTL.RefClkPer which
sets the period of ref_clk in nano second.
Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
Signed-off-by: John Youn <johnyoun@xxxxxxxxxxxx>
---
Documentation/devicetree/bindings/usb/dwc3.txt | 2 ++
drivers/usb/dwc3/core.c | 21 +++++++++++++++++++++
drivers/usb/dwc3/core.h | 5 +++++
drivers/usb/dwc3/dwc3-pci.c | 1 +
4 files changed, 29 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index e3e6983..aa54ba7 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -50,6 +50,8 @@ Optional properties:
- snps,hird-threshold: HIRD threshold
- snps,hsphy_interface: High-Speed PHY interface selection between "utmi" for
UTMI+ and "ulpi" for ULPI when the DWC_USB3_HSPHY_INTERFACE has value 3.
+ - snps,ref_clk_per: value for GUTCL.RefClkPer field that sets the period of
+ ref_clk in nano seconds.
- snps,quirk-frame-length-adjustment: Value for GFLADJ_30MHZ field of GFLADJ
register for post-silicon frame length adjustment when the
fladj_30mhz_sdbnd signal is invalid or incorrect.
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index d6d3fa0..b96bf69 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -145,6 +145,23 @@ static int dwc3_soft_reset(struct dwc3 *dwc)
return 0;
}
+/*
+ * dwc3_ref_clock_period - Sets the reference clock period
+ * @dwc3: Pointer to our controller context structure
+ */
+static void dwc3_ref_clock_period(struct dwc3 *dwc)
+{
+ u32 reg;
+
+ if (dwc->ref_clk_per == 0)
+ return;
+
+ reg = dwc3_readl(dwc->regs, DWC3_GUCTL);
+ reg &= ~DWC3_GUCTL_REFCLKPER_MASK;
+ reg |= DWC3_GUCTL_REFCLKPER(dwc->ref_clk_per);
+ dwc3_writel(dwc->regs, DWC3_GUCTL, reg);
+}
+
/*
* dwc3_frame_length_adjustment - Adjusts frame length if required
* @dwc3: Pointer to our controller context structure
@@ -670,6 +687,9 @@ static int dwc3_core_init(struct dwc3 *dwc)
if (ret)
goto err1;
+ /* Initialize ref clock period */
+ dwc3_ref_clock_period(dwc);
+
/* Adjust Frame Length */
dwc3_frame_length_adjustment(dwc);
@@ -984,6 +1004,7 @@ static int dwc3_probe(struct platform_device *pdev)
&dwc->hsphy_interface);
device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",
&dwc->fladj);
+ device_property_read_u32(dev, "snps,ref_clk_per", &dwc->ref_clk_per);
dwc->lpm_nyet_threshold = lpm_nyet_threshold;
dwc->tx_de_emphasis = tx_de_emphasis;
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index b2317e7..ab58334 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -198,6 +198,10 @@
#define DWC3_GCTL_GBLHIBERNATIONEN (1 << 1)
#define DWC3_GCTL_DSBLCLKGTNG (1 << 0)
+/* Global USB3 user Control Register */
+#define DWC3_GUCTL_REFCLKPER(n) ((n) << 22)
+#define DWC3_GUCTL_REFCLKPER_MASK DWC3_GUCTL_REFCLKPER(0x3ff)
+
/* Global USB2 PHY Configuration Register */
#define DWC3_GUSB2PHYCFG_PHYSOFTRST (1 << 31)
#define DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS (1 << 30)
@@ -872,6 +876,7 @@ struct dwc3 {
enum usb_dr_mode dr_mode;
enum usb_phy_interface hsphy_mode;
+ u32 ref_clk_per;
u32 fladj;
u32 irq_gadget;
u32 nr_scratch;
diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index 2eb84d6..254788b 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -127,6 +127,7 @@ static int dwc3_pci_quirks(struct pci_dev *pdev, struct platform_device *dwc3)
PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
+ PROPERTY_ENTRY_U32("snps,ref_clk_per", 0x32),
{ },
};
--
2.9.0
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