Patch "usb: dwc3: Add splitdisable quirk for Hisilicon Kirin Soc" has been added to the 4.19-stable tree

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This is a note to let you know that I've just added the patch titled

    usb: dwc3: Add splitdisable quirk for Hisilicon Kirin Soc

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-dwc3-add-splitdisable-quirk-for-hisilicon-kirin-.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit b74a37d0e980d05c0f9ae24dfa9e72342214db03
Author: Yu Chen <chenyu56@xxxxxxxxxx>
Date:   Tue Sep 8 09:20:56 2020 +0200

    usb: dwc3: Add splitdisable quirk for Hisilicon Kirin Soc
    
    [ Upstream commit f580170f135af14e287560d94045624d4242d712 ]
    
    SPLIT_BOUNDARY_DISABLE should be set for DesignWare USB3 DRD Core
    of Hisilicon Kirin Soc when dwc3 core act as host.
    
    [mchehab: dropped a dev_dbg() as only traces are now allowwed on this driver]
    
    Signed-off-by: Yu Chen <chenyu56@xxxxxxxxxx>
    Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
    Signed-off-by: Felipe Balbi <balbi@xxxxxxxxxx>
    Stable-dep-of: 0d410e8913f5 ("usb: dwc3: core: Stop processing of pending events if controller is halted")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 259eeb2f6ad53..f50b8bf22356b 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -116,6 +116,7 @@ static void __dwc3_set_mode(struct work_struct *work)
 	struct dwc3 *dwc = work_to_dwc(work);
 	unsigned long flags;
 	int ret;
+	u32 reg;
 
 	if (dwc->dr_mode != USB_DR_MODE_OTG)
 		return;
@@ -167,6 +168,11 @@ static void __dwc3_set_mode(struct work_struct *work)
 				otg_set_vbus(dwc->usb2_phy->otg, true);
 			phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
 			phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
+			if (dwc->dis_split_quirk) {
+				reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
+				reg |= DWC3_GUCTL3_SPLITDISABLE;
+				dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
+			}
 		}
 		break;
 	case DWC3_GCTL_PRTCAP_DEVICE:
@@ -1314,6 +1320,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	dwc->dis_metastability_quirk = device_property_read_bool(dev,
 				"snps,dis_metastability_quirk");
 
+	dwc->dis_split_quirk = device_property_read_bool(dev,
+				"snps,dis-split-quirk");
+
 	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
 	dwc->tx_de_emphasis = tx_de_emphasis;
 
@@ -1850,10 +1859,26 @@ static int dwc3_resume(struct device *dev)
 
 	return 0;
 }
+
+static void dwc3_complete(struct device *dev)
+{
+	struct dwc3	*dwc = dev_get_drvdata(dev);
+	u32		reg;
+
+	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST &&
+			dwc->dis_split_quirk) {
+		reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
+		reg |= DWC3_GUCTL3_SPLITDISABLE;
+		dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
+	}
+}
+#else
+#define dwc3_complete NULL
 #endif /* CONFIG_PM_SLEEP */
 
 static const struct dev_pm_ops dwc3_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
+	.complete = dwc3_complete,
 	SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume,
 			dwc3_runtime_idle)
 };
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index a1d65e36a4d41..7f8804e9e74c3 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -135,6 +135,7 @@
 #define DWC3_GEVNTCOUNT(n)	(0xc40c + ((n) * 0x10))
 
 #define DWC3_GHWPARAMS8		0xc600
+#define DWC3_GUCTL3		0xc60c
 #define DWC3_GFLADJ		0xc630
 
 /* Device Registers */
@@ -362,6 +363,9 @@
 /* Global User Control Register 2 */
 #define DWC3_GUCTL2_RST_ACTBITLATER		BIT(14)
 
+/* Global User Control Register 3 */
+#define DWC3_GUCTL3_SPLITDISABLE		BIT(14)
+
 /* Device Configuration Register */
 #define DWC3_DCFG_DEVADDR(addr)	((addr) << 3)
 #define DWC3_DCFG_DEVADDR_MASK	DWC3_DCFG_DEVADDR(0x7f)
@@ -1004,6 +1008,7 @@ struct dwc3_scratchpad_array {
  * 	2	- No de-emphasis
  * 	3	- Reserved
  * @dis_metastability_quirk: set to disable metastability quirk.
+ * @dis_split_quirk: set to disable split boundary.
  * @imod_interval: set the interrupt moderation interval in 250ns
  *                 increments or 0 to disable.
  */
@@ -1175,6 +1180,8 @@ struct dwc3 {
 
 	unsigned		dis_metastability_quirk:1;
 
+	unsigned		dis_split_quirk:1;
+
 	u16			imod_interval;
 };
 




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