[PATCH v4 4/5] usb: dwc3: add dis_del_phy_power_chg_quirk

[William Wu <william.wu-TNX95d0MmH7DzftRWevZcw@public.gmane.org>]

Add a quirk to clear the GUSB3PIPECTL.DELAYP1TRANS bit,
which specifies whether disable delay PHY power change
from P0 to P1/P2/P3 when link state changing from U0
to U1/U2/U3 respectively.

Signed-off-by: William Wu <william.wu-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---
Changes in v4:
- rebase on top of balbi testing/next, remove pdata (balbi)

Changes in v3:
- None

Changes in v2:
- None

 Documentation/devicetree/bindings/usb/dwc3.txt | 2 ++
 drivers/usb/dwc3/core.c                        | 5 +++++
 drivers/usb/dwc3/core.h                        | 3 +++
 3 files changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 34d13a5..bd5bef0 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -42,6 +42,8 @@ Optional properties:
  - snps,dis_u2_freeclk_exists_quirk: when set, clear the u2_freeclk_exists
 			in GUSB2PHYCFG, specify that USB2 PHY doesn't provide
 			a free-running PHY clock.
+ - snps,dis_del_phy_power_chg_quirk: when set core will change PHY power
+			from P0 to P1/P2/P3 without delay.
  - snps,phyif_utmi_quirk: when set core will set phyif UTMI+ interface.
  - snps,phyif_utmi: the value to configure the core to support a UTMI+ PHY
 			with an 8- or 16-bit interface. Value 0 select 8-bit
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 30fe400..65b1b9f 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -449,6 +449,9 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->dis_u3_susphy_quirk)
 		reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
 
+	if (dwc->dis_del_phy_power_chg_quirk)
+		reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE;
+
 	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 
 	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
@@ -949,6 +952,8 @@ static int dwc3_probe(struct platform_device *pdev)
 				"snps,dis_rxdet_inp3_quirk");
 	dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev,
 				"snps,dis_u2_freeclk_exists_quirk");
+	dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev,
+				"snps,dis_del_phy_power_chg_quirk");
 	dwc->phyif_utmi_quirk = device_property_read_bool(dev,
 				"snps,phyif_utmi_quirk");
 	device_property_read_u8(dev, "snps,phyif_utmi",
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 510a6f1..9481827 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -808,6 +808,8 @@ struct dwc3_scratchpad_array {
  * @dis_u2_freeclk_exists_quirk : set if we clear u2_freeclk_exists
  *			in GUSB2PHYCFG, specify that USB2 PHY doesn't
  *			provide a free-running PHY clock.
+ * @dis_del_phy_power_chg_quirk: set if we disable delay phy power
+ *			change quirk.
  * @phyif_utmi_quirk: set if we enable phyif UTMI+ quirk
  * @phyif_utmi: UTMI+ PHY interface value
  *	0	- 8 bits
@@ -956,6 +958,7 @@ struct dwc3 {
 	unsigned		dis_enblslpm_quirk:1;
 	unsigned		dis_rxdet_inp3_quirk:1;
 	unsigned		dis_u2_freeclk_exists_quirk:1;
+	unsigned		dis_del_phy_power_chg_quirk:1;
 
 	unsigned		phyif_utmi_quirk:1;
 	unsigned		phyif_utmi:1;
-- 
1.9.1