[PATCH v4 0/5] support rockchip dwc3 driver

[PATCH v4 0/5] support rockchip dwc3 driver

[William Wu]

This series add support for rockchip dwc3 driver,
and add additional optional properties for specific
platforms (e.g., rockchip rk3399 platform).

William Wu (5):
  usb: dwc3: of-simple: add compatible for rockchip
  usb: dwc3: add dis_u2_freeclk_exists_quirk
  usb: dwc3: add phyif_utmi_quirk
  usb: dwc3: add dis_del_phy_power_chg_quirk
  usb: dwc3: rockchip: add devicetree bindings documentation

 Documentation/devicetree/bindings/usb/dwc3.txt     |  9 +++++
 .../devicetree/bindings/usb/rockchip,dwc3.txt      | 46 ++++++++++++++++++++++
 drivers/usb/dwc3/core.c                            | 29 ++++++++++++++
 drivers/usb/dwc3/core.h                            | 20 ++++++++++
 drivers/usb/dwc3/dwc3-of-simple.c                  |  1 +
 5 files changed, 105 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/rockchip,dwc3.txt

-- 
1.9.1

[PATCH v4 1/5] usb: dwc3: of-simple: add compatible for rockchip

[William Wu]

Rockchip platform merely enable usb3 clocks and
populate its children. So we can use this generic
glue layer to support Rockchip dwc3.

Signed-off-by: William Wu <william.wu@rock-chips.com>
---
Changes in v4:
- None

Changes in v3:
- None

Changes in v2:
- sort the list of_dwc3_simple_match (Doug)

 drivers/usb/dwc3/dwc3-of-simple.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
index 9743353..6da9656 100644
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -161,6 +161,7 @@ static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
 
 static const struct of_device_id of_dwc3_simple_match[] = {
 	{ .compatible = "qcom,dwc3" },
+	{ .compatible = "rockchip,dwc3" },
 	{ .compatible = "xlnx,zynqmp-dwc3" },
 	{ /* Sentinel */ }
 };
-- 
1.9.1

[PATCH v4 2/5] usb: dwc3: add dis_u2_freeclk_exists_quirk

[William Wu]

Add a quirk to clear the GUSB2PHYCFG.U2_FREECLK_EXISTS bit,
which specifies whether the USB2.0 PHY provides a free-running
PHY clock, which is active when the clock control input is active.

Signed-off-by: William Wu <william.wu@rock-chips.com>
---
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 | 3 +++
 drivers/usb/dwc3/core.c                        | 5 +++++
 drivers/usb/dwc3/core.h                        | 5 +++++
 3 files changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 7d7ce08..1ada121 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -39,6 +39,9 @@ Optional properties:
 			disabling the suspend signal to the PHY.
  - snps,dis_rxdet_inp3_quirk: when set core will disable receiver detection
 			in PHY P3 power state.
+ - 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,is-utmi-l1-suspend: true when DWC3 asserts output signal
 			utmi_l1_suspend_n, false when asserts utmi_sleep_n
  - snps,hird-threshold: HIRD threshold
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 9c4e1d8d..f4b18b2 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -500,6 +500,9 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->dis_enblslpm_quirk)
 		reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
 
+	if (dwc->dis_u2_freeclk_exists_quirk)
+		reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
+
 	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 
 	return 0;
@@ -930,6 +933,8 @@ static int dwc3_probe(struct platform_device *pdev)
 				"snps,dis_enblslpm_quirk");
 	dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev,
 				"snps,dis_rxdet_inp3_quirk");
+	dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev,
+				"snps,dis_u2_freeclk_exists_quirk");
 
 	dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,
 				"snps,tx_de_emphasis_quirk");
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 4a5453c..bcd1aa2 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -199,6 +199,7 @@
 
 /* Global USB2 PHY Configuration Register */
 #define DWC3_GUSB2PHYCFG_PHYSOFTRST	(1 << 31)
+#define DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS	(1 << 30)
 #define DWC3_GUSB2PHYCFG_SUSPHY		(1 << 6)
 #define DWC3_GUSB2PHYCFG_ULPI_UTMI	(1 << 4)
 #define DWC3_GUSB2PHYCFG_ENBLSLPM	(1 << 8)
@@ -798,6 +799,9 @@ struct dwc3_scratchpad_array {
  * @dis_u2_susphy_quirk: set if we disable usb2 suspend phy
  * @dis_enblslpm_quirk: set if we clear enblslpm in GUSB2PHYCFG,
  *                      disabling the suspend signal to the PHY.
+ * @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.
  * @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk
  * @tx_de_emphasis: Tx de-emphasis value
  * 	0	- -6dB de-emphasis
@@ -941,6 +945,7 @@ struct dwc3 {
 	unsigned		dis_u2_susphy_quirk:1;
 	unsigned		dis_enblslpm_quirk:1;
 	unsigned		dis_rxdet_inp3_quirk:1;
+	unsigned		dis_u2_freeclk_exists_quirk:1;
 
 	unsigned		tx_de_emphasis_quirk:1;
 	unsigned		tx_de_emphasis:2;
-- 
1.9.1

[PATCH v4 3/5] usb: dwc3: add phyif_utmi_quirk

[William Wu]

Add a quirk to configure the core to support the
UTMI+ PHY with an 8- or 16-bit interface. UTMI+ PHY
interface is hardware property, and it's platform
dependent. Normall, the PHYIf can be configured
during coreconsultant. But for some specific usb
cores(e.g. rk3399 soc dwc3), the default PHYIf
configuration value is fault, so we need to
reconfigure it by software.

And refer to the dwc3 databook, the GUSB2PHYCFG.USBTRDTIM
must be set to the corresponding value according to
the UTMI+ PHY interface.

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

Changes in v3:
- None

Changes in v2:
- add a quirk for phyif_utmi (balbi)

 Documentation/devicetree/bindings/usb/dwc3.txt |  4 ++++
 drivers/usb/dwc3/core.c                        | 19 +++++++++++++++++++
 drivers/usb/dwc3/core.h                        | 12 ++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 1ada121..34d13a5 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -42,6 +42,10 @@ 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,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
+			interface, value 1 select 16-bit interface.
  - snps,is-utmi-l1-suspend: true when DWC3 asserts output signal
 			utmi_l1_suspend_n, false when asserts utmi_sleep_n
  - snps,hird-threshold: HIRD threshold
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index f4b18b2..30fe400 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -408,6 +408,7 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc)
 static int dwc3_phy_setup(struct dwc3 *dwc)
 {
 	u32 reg;
+	u32 usbtrdtim;
 	int ret;
 
 	reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
@@ -503,6 +504,15 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->dis_u2_freeclk_exists_quirk)
 		reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
 
+	if (dwc->phyif_utmi_quirk) {
+		reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
+		       DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
+		usbtrdtim = dwc->phyif_utmi ? USBTRDTIM_UTMI_16_BIT :
+			    USBTRDTIM_UTMI_8_BIT;
+		reg |= DWC3_GUSB2PHYCFG_PHYIF(dwc->phyif_utmi) |
+		       DWC3_GUSB2PHYCFG_USBTRDTIM(usbtrdtim);
+	}
+
 	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 
 	return 0;
@@ -830,6 +840,7 @@ static int dwc3_probe(struct platform_device *pdev)
 	struct resource		*res;
 	struct dwc3		*dwc;
 	u8			lpm_nyet_threshold;
+	u8			phyif_utmi;
 	u8			tx_de_emphasis;
 	u8			hird_threshold;
 
@@ -886,6 +897,9 @@ static int dwc3_probe(struct platform_device *pdev)
 	/* default to highest possible threshold */
 	lpm_nyet_threshold = 0xff;
 
+	/* default to UTMI+ 8-bit interface */
+	phyif_utmi = 0;
+
 	/* default to -3.5dB de-emphasis */
 	tx_de_emphasis = 1;
 
@@ -935,6 +949,10 @@ 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->phyif_utmi_quirk = device_property_read_bool(dev,
+				"snps,phyif_utmi_quirk");
+	device_property_read_u8(dev, "snps,phyif_utmi",
+				&phyif_utmi);
 
 	dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,
 				"snps,tx_de_emphasis_quirk");
@@ -946,6 +964,7 @@ static int dwc3_probe(struct platform_device *pdev)
 				 &dwc->fladj);
 
 	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
+	dwc->phyif_utmi = phyif_utmi;
 	dwc->tx_de_emphasis = tx_de_emphasis;
 
 	dwc->hird_threshold = hird_threshold
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index bcd1aa2..510a6f1 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -203,6 +203,12 @@
 #define DWC3_GUSB2PHYCFG_SUSPHY		(1 << 6)
 #define DWC3_GUSB2PHYCFG_ULPI_UTMI	(1 << 4)
 #define DWC3_GUSB2PHYCFG_ENBLSLPM	(1 << 8)
+#define DWC3_GUSB2PHYCFG_PHYIF(n)	(n << 3)
+#define DWC3_GUSB2PHYCFG_PHYIF_MASK	DWC3_GUSB2PHYCFG_PHYIF(1)
+#define DWC3_GUSB2PHYCFG_USBTRDTIM(n)	(n << 10)
+#define DWC3_GUSB2PHYCFG_USBTRDTIM_MASK	DWC3_GUSB2PHYCFG_USBTRDTIM(0xf)
+#define USBTRDTIM_UTMI_8_BIT		9
+#define USBTRDTIM_UTMI_16_BIT		5
 
 /* Global USB2 PHY Vendor Control Register */
 #define DWC3_GUSB2PHYACC_NEWREGREQ	(1 << 25)
@@ -802,6 +808,10 @@ 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.
+ * @phyif_utmi_quirk: set if we enable phyif UTMI+ quirk
+ * @phyif_utmi: UTMI+ PHY interface value
+ *	0	- 8 bits
+ *	1	- 16 bits
  * @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk
  * @tx_de_emphasis: Tx de-emphasis value
  * 	0	- -6dB de-emphasis
@@ -947,6 +957,8 @@ struct dwc3 {
 	unsigned		dis_rxdet_inp3_quirk:1;
 	unsigned		dis_u2_freeclk_exists_quirk:1;
 
+	unsigned		phyif_utmi_quirk:1;
+	unsigned		phyif_utmi:1;
 	unsigned		tx_de_emphasis_quirk:1;
 	unsigned		tx_de_emphasis:2;
 };
-- 
1.9.1

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

[William Wu]

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@rock-chips.com>
---
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