usb: dwc3: core: write LINUX_VERSION_CODE to our GUID register

DWC3's GUID register is supposed to be used to write
any sort of version we might want. It helps when getting
bug reports for platforms you don't have HW to know
which kernel version of the driver was running on the
platform.

Because we don't really track driver version, but we _do_
track the kernel version, let's write LINUX_VERSION_CODE to
that register and use it for debugging.

Reviewed-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index b0f4d52b7f04a023b6d743c686a54eace4797047..ddfe7718e4a32c62084c45d59d14a3fe0c6fe93b 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/version.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
@@ -384,6 +385,12 @@ static int dwc3_core_init(struct dwc3 *dwc)
        }
        dwc->revision = reg;
 
+       /*
+        * Write Linux Version Code to our GUID register so it's easy to figure
+        * out which kernel version a bug was found.
+        */
+       dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);
+
        /* Handle USB2.0-only core configuration */
        if (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
                        DWC3_GHWPARAMS3_SSPHY_IFC_DIS) {