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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>
This commit is contained in:
Huang Rui 2014-10-28 19:54:23 +08:00 committed by Felipe Balbi
parent 2eac399289
commit 946bd579a6
2 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/dwc3/core.c
View File

@ -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

5
drivers/usb/dwc3/core.h
View File

@ -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;