usb: dwc3: make maximum-speed a per-instance attribute

in order to allow different instances of the
core work in different maximum speeds, we will
move the maximum_speed module_parameter to
both DeviceTree (making use the new maximum-speed
DT property) and platform_data.

Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index cb1eb37..0686acf 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -36,6 +36,7 @@
 #include <linux/usb/otg.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
+#include <linux/usb/of.h>
 
 #include "platform_data.h"
 #include "core.h"
@@ -44,10 +45,6 @@
 
 #include "debug.h"
 
-static char *maximum_speed = "super";
-module_param(maximum_speed, charp, 0);
-MODULE_PARM_DESC(maximum_speed, "Maximum supported speed.");
-
 /* -------------------------------------------------------------------------- */
 
 void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
@@ -412,17 +409,25 @@ static int dwc3_probe(struct platform_device *pdev)
        }
 
        if (node) {
+               dwc->maximum_speed = of_usb_get_maximum_speed(node);
+
                dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
                dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
 
                dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
        } else {
+               dwc->maximum_speed = pdata->maximum_speed;
+
                dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
                dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
 
                dwc->needs_fifo_resize = pdata->tx_fifo_resize;
        }
 
+       /* default to superspeed if no maximum_speed passed */
+       if (dwc->maximum_speed == USB_SPEED_UNKNOWN)
+               dwc->maximum_speed = USB_SPEED_SUPER;
+
        if (IS_ERR(dwc->usb2_phy)) {
                ret = PTR_ERR(dwc->usb2_phy);
 
@@ -467,17 +472,6 @@ static int dwc3_probe(struct platform_device *pdev)
        dev->dma_parms  = dev->parent->dma_parms;
        dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
 
-       if (!strncmp("super", maximum_speed, 5))
-               dwc->maximum_speed = DWC3_DCFG_SUPERSPEED;
-       else if (!strncmp("high", maximum_speed, 4))
-               dwc->maximum_speed = DWC3_DCFG_HIGHSPEED;
-       else if (!strncmp("full", maximum_speed, 4))
-               dwc->maximum_speed = DWC3_DCFG_FULLSPEED1;
-       else if (!strncmp("low", maximum_speed, 3))
-               dwc->maximum_speed = DWC3_DCFG_LOWSPEED;
-       else
-               dwc->maximum_speed = DWC3_DCFG_SUPERSPEED;
-
        pm_runtime_enable(dev);
        pm_runtime_get_sync(dev);
        pm_runtime_forbid(dev);

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 033419b..4ca5706 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1525,10 +1525,25 @@ static int dwc3_gadget_start(struct usb_gadget *g,
         * STAR#9000525659: Clock Domain Crossing on DCTL in
         * USB 2.0 Mode
         */
-       if (dwc->revision < DWC3_REVISION_220A)
+       if (dwc->revision < DWC3_REVISION_220A) {
                reg |= DWC3_DCFG_SUPERSPEED;
-       else
-               reg |= dwc->maximum_speed;
+       } else {
+               switch (dwc->maximum_speed) {
+               case USB_SPEED_LOW:
+                       reg |= DWC3_DSTS_LOWSPEED;
+                       break;
+               case USB_SPEED_FULL:
+                       reg |= DWC3_DSTS_FULLSPEED1;
+                       break;
+               case USB_SPEED_HIGH:
+                       reg |= DWC3_DSTS_HIGHSPEED;
+                       break;
+               case USB_SPEED_SUPER:   /* FALLTHROUGH */
+               case USB_SPEED_UNKNOWN: /* FALTHROUGH */
+               default:
+                       reg |= DWC3_DSTS_SUPERSPEED;
+               }
+       }
        dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 
        dwc->start_config_issued = false;

diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index 0385164..16ffe19 100644 (file)
--- a/drivers/usb/dwc3/platform_data.h
+++ b/drivers/usb/dwc3/platform_data.h
@@ -17,6 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/usb/ch9.h>
+
 struct dwc3_platform_data {
+       enum usb_device_speed maximum_speed;
        bool tx_fifo_resize;
 };