usb: dwc3: add dis_u2_freeclk_exists_quirk

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>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 7d7ce08..020b0e9 100644 (file)
--- 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 9466431..0b7bfd2 100644 (file)
--- 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;
@@ -924,6 +927,8 @@ 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 1a6cc48..08ed9e0 100644 (file)
--- 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)
@@ -803,6 +804,9 @@ 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
@@ -946,6 +950,7 @@ 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;