usb: dwc3: add a flag to check if it is fpga board

Some chip vendor is on pre-silicon phase, which needs to use the simulation
board. It should have the same product and vendor id with the true soc, but
might have some minor different configurations.

Below thread discussion proposes to find a method to distinguish between
simulation board and soc.

http://marc.info/?l=linux-usb&m=141194772206369&w=2

In Andvanced Configuration of coreConsultant, there is the parameter of
DWC_USB_EN_FPGA. This bit has the function we need. And it would response as 7
bit of GHWPARAMS6 register. So it's able to check this functional bit to confirm
if works on FPGA board.

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

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 2f7aecc620e7bd9d5ee822fbfc665affb2efae4c..9830f87b6940cd33ff01c9054d53c11cda1dc59d 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -460,6 +460,12 @@ static int dwc3_core_init(struct dwc3 *dwc)
                dev_dbg(dwc->dev, "No power optimization available\n");
        }
 
+       /* check if current dwc3 is on simulation board */
+       if (dwc->hwparams.hwparams6 & DWC3_GHWPARAMS6_EN_FPGA) {
+               dev_dbg(dwc->dev, "it is on FPGA board\n");
+               dwc->is_fpga = true;
+       }
+
        /*
         * WORKAROUND: DWC3 revisions <1.90a have a bug
         * where the device can fail to connect at SuperSpeed

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index a715ee1f3c062aa7ef5862407dc57d8272243655..f6ee623e2d1be73b1ddc69f1eeb9ebaa6b6e23d1 100644 (file)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -210,6 +210,9 @@
 #define DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(n)   (((n) & (0x0f << 13)) >> 13)
 #define DWC3_MAX_HIBER_SCRATCHBUFS             15
 
+/* Global HWPARAMS6 Register */
+#define DWC3_GHWPARAMS6_EN_FPGA                        (1 << 7)
+
 /* Device Configuration Register */
 #define DWC3_DCFG_DEVADDR(addr)        ((addr) << 3)
 #define DWC3_DCFG_DEVADDR_MASK DWC3_DCFG_DEVADDR(0x7f)
@@ -662,6 +665,7 @@ struct dwc3_scratchpad_array {
  * @ep0_expect_in: true when we expect a DATA IN transfer
  * @has_hibernation: true when dwc3 was configured with Hibernation
  * @is_selfpowered: true when we are selfpowered
+ * @is_fpga: true when we are using the FPGA board
  * @needs_fifo_resize: not all users might want fifo resizing, flag it
  * @pullups_connected: true when Run/Stop bit is set
  * @resize_fifos: tells us it's ok to reconfigure our TxFIFO sizes.
@@ -765,6 +769,7 @@ struct dwc3 {
        unsigned                ep0_expect_in:1;
        unsigned                has_hibernation:1;
        unsigned                is_selfpowered:1;
+       unsigned                is_fpga:1;
        unsigned                needs_fifo_resize:1;
        unsigned                pullups_connected:1;
        unsigned                resize_fifos:1;