usb: dwc3: add disable usb2 suspend phy quirk

This patch adds disable usb2 suspend phy quirk, and some special platforms
can configure that if it is needed.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

4 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 08b394ebeb3e..f200ecc1f0dc 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -33,6 +33,7 @@ Optional properties:
  - snps,tx_de_emphasis: the value driven to the PHY is controlled by the
                         LTSSM during USB3 Compliance mode.
  - snps,dis_u3_susphy_quirk: when set core will disable USB3 suspend phy.
+ - snps,dis_u2_susphy_quirk: when set core will disable USB2 suspend phy.
 
 This is usually a subnode to DWC3 glue to which it is connected.
 
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 87ffb86bc2f2..3ea55f214439 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -422,6 +422,9 @@ static void dwc3_phy_setup(struct dwc3 *dwc)
         if (dwc->revision > DWC3_REVISION_194A)
                 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
 
+        if (dwc->dis_u2_susphy_quirk && dwc->is_fpga)
+                reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
+
         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 
         mdelay(100);
@@ -817,6 +820,8 @@ static int dwc3_probe(struct platform_device *pdev)
                                 "snps,rx_detect_poll_quirk");
                 dwc->dis_u3_susphy_quirk = of_property_read_bool(node,
                                 "snps,dis_u3_susphy_quirk");
+                dwc->dis_u2_susphy_quirk = of_property_read_bool(node,
+                                "snps,dis_u2_susphy_quirk");
 
                 dwc->tx_de_emphasis_quirk = of_property_read_bool(node,
                                 "snps,tx_de_emphasis_quirk");
@@ -840,6 +845,7 @@ static int dwc3_probe(struct platform_device *pdev)
                 dwc->lfps_filter_quirk = pdata->lfps_filter_quirk;
                 dwc->rx_detect_poll_quirk = pdata->rx_detect_poll_quirk;
                 dwc->dis_u3_susphy_quirk = pdata->dis_u3_susphy_quirk;
+                dwc->dis_u2_susphy_quirk = pdata->dis_u2_susphy_quirk;
 
                 dwc->tx_de_emphasis_quirk = pdata->tx_de_emphasis_quirk;
                 if (pdata->tx_de_emphasis)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index fa778b0a5ab7..cf86d3022b52 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -698,6 +698,7 @@ struct dwc3_scratchpad_array {
  * @lfps_filter_quirk: set if we enable LFPS filter quirk
  * @rx_detect_poll_quirk: set if we enable rx_detect to polling lfps quirk
  * @dis_u3_susphy_quirk: set if we disable usb3 suspend phy
+ * @dis_u2_susphy_quirk: set if we disable usb2 suspend phy
  * @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk
  * @tx_de_emphasis: Tx de-emphasis value
  *      0       - -6dB de-emphasis
@@ -820,6 +821,7 @@ struct dwc3 {
         unsigned                lfps_filter_quirk:1;
         unsigned                rx_detect_poll_quirk:1;
         unsigned                dis_u3_susphy_quirk:1;
+        unsigned                dis_u2_susphy_quirk:1;
 
         unsigned                tx_de_emphasis_quirk:1;
         unsigned                tx_de_emphasis:2;
diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index 0f1d5adc657d..245300be057a 100644
--- a/drivers/usb/dwc3/platform_data.h
+++ b/drivers/usb/dwc3/platform_data.h
@@ -37,6 +37,7 @@ struct dwc3_platform_data {
         unsigned lfps_filter_quirk:1;
         unsigned rx_detect_poll_quirk:1;
         unsigned dis_u3_susphy_quirk:1;
+        unsigned dis_u2_susphy_quirk:1;
 
         unsigned tx_de_emphasis_quirk:1;
         unsigned tx_de_emphasis:2;