From: Gevorg Sahakyan <sahakyan@xxxxxxxxxxxx>
Only check the ID portion of the GSNPSID register and don’t check
the version. This will allow the driver to work with version 4.00a
and later of the DWC_hsotg IP.
Signed-off-by: Gevorg Sahakyan <sahakyan@xxxxxxxxxxxx>
Signed-off-by: Minas Harutyunyan <hminas@xxxxxxxxxxxx>
Signed-off-by: Grigor Tovmasyan <tovmasya@xxxxxxxxxxxx>
---
drivers/usb/dwc2/core.h | 5 +++++
drivers/usb/dwc2/hw.h | 1 +
drivers/usb/dwc2/params.c | 11 +++++------
3 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index f66c94130cac..91566d35c028 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -951,6 +951,11 @@ struct dwc2_hsotg {
#define DWC2_FS_IOT_REV_1_00a 0x5531100a
#define DWC2_HS_IOT_REV_1_00a 0x5532100a
+ /* DWC OTG HW Core ID */
+#define DWC2_OTG_ID 0x4f540000
+#define DWC2_FS_IOT_ID 0x55310000
+#define DWC2_HS_IOT_ID 0x55320000
+
#if IS_ENABLED(CONFIG_USB_DWC2_HOST) || IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
union dwc2_hcd_internal_flags {
u32 d32;
diff --git a/drivers/usb/dwc2/hw.h b/drivers/usb/dwc2/hw.h
index 2c906d8ee465..43a3fb00f14f 100644
--- a/drivers/usb/dwc2/hw.h
+++ b/drivers/usb/dwc2/hw.h
@@ -231,6 +231,7 @@
#define GUID HSOTG_REG(0x003c)
#define GSNPSID HSOTG_REG(0x0040)
#define GHWCFG1 HSOTG_REG(0x0044)
+#define GSNPSID_ID_MASK GENMASK(31, 16)
#define GHWCFG2 HSOTG_REG(0x0048)
#define GHWCFG2_OTG_ENABLE_IC_USB BIT(31)
diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index ef73af6e03a9..7c20c8e31179 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -638,14 +638,13 @@ int dwc2_get_hwparams(struct dwc2_hsotg *hsotg)
/*
* Attempt to ensure this device is really a DWC_otg Controller.
* Read and verify the GSNPSID register contents. The value should be
- * 0x45f42xxx or 0x45f43xxx, which corresponds to either "OT2" or "OT3",
- * as in "OTG version 2.xx" or "OTG version 3.xx".
+ * 0x45f4xxxx, 0x5531xxxx or 0x5532xxxx
*/
+
hw->snpsid = dwc2_readl(hsotg->regs + GSNPSID);
- if ((hw->snpsid & 0xfffff000) != 0x4f542000 &&
- (hw->snpsid & 0xfffff000) != 0x4f543000 &&
- (hw->snpsid & 0xffff0000) != 0x55310000 &&
- (hw->snpsid & 0xffff0000) != 0x55320000) {
+ if ((hw->snpsid & GSNPSID_ID_MASK) != DWC2_OTG_ID &&
+ (hw->snpsid & GSNPSID_ID_MASK) != DWC2_FS_IOT_ID &&
+ (hw->snpsid & GSNPSID_ID_MASK) != DWC2_HS_IOT_ID) {
dev_err(hsotg->dev, "Bad value for GSNPSID: 0x%08x\n",
hw->snpsid);
return -ENODEV;
--
2.11.0
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