usb: dwc3: Create helper function getting MDWIDTH

Different controller IPs check different HW parameters for MDWIDTH.
To help with maintainability, create a helper function to consolidate
the logic in a single place.
Signed-off-by: NThinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/456329d36e8c188df5c234f3282595b630bf1470.1616892233.git.Thinh.Nguyen@synopsys.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/core.h

@@ -860,8 +860,6 @@ struct dwc3_hwparams {
 /* HWPARAMS0 */
 #define DWC3_MODE(n)		((n) & 0x7)
 
-#define DWC3_MDWIDTH(n)		(((n) & 0xff00) >> 8)
-
 /* HWPARAMS1 */
 #define DWC3_NUM_INT(n)		(((n) & (0x3f << 15)) >> 15)
 
@@ -1458,6 +1456,23 @@ u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type);
 	 (!(_ip##_VERSIONTYPE_##_to) ||					\
 	  dwc->version_type <= _ip##_VERSIONTYPE_##_to))
 
+/**
+ * dwc3_mdwidth - get MDWIDTH value in bits
+ * @dwc: pointer to our context structure
+ *
+ * Return MDWIDTH configuration value in bits.
+ */
+static inline u32 dwc3_mdwidth(struct dwc3 *dwc)
+{
+	u32 mdwidth;
+
+	mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0);
+	if (DWC3_IP_IS(DWC32))
+		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+
+	return mdwidth;
+}
+
 bool dwc3_has_imod(struct dwc3 *dwc);
 
 int dwc3_event_buffers_setup(struct dwc3 *dwc);

drivers/usb/dwc3/debugfs.c

@@ -638,16 +638,14 @@ static int dwc3_tx_fifo_size_show(struct seq_file *s, void *unused)
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
-	int			mdwidth;
+	u32			mdwidth;
 	u32			val;
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_TXFIFO);
 
 	/* Convert to bytes */
-	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
-	if (DWC3_IP_IS(DWC32))
-		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+	mdwidth = dwc3_mdwidth(dwc);
 
 	val *= mdwidth;
 	val >>= 3;
@@ -662,16 +660,14 @@ static int dwc3_rx_fifo_size_show(struct seq_file *s, void *unused)
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
-	int			mdwidth;
+	u32			mdwidth;
 	u32			val;
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_RXFIFO);
 
 	/* Convert to bytes */
-	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
-	if (DWC3_IP_IS(DWC32))
-		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+	mdwidth = dwc3_mdwidth(dwc);
 
 	val *= mdwidth;
 	val >>= 3;

drivers/usb/dwc3/gadget.c

@@ -2337,9 +2337,7 @@ static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
 	u32 reg;
 
 	ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
-	mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0);
-	if (DWC3_IP_IS(DWC32))
-		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+	mdwidth = dwc3_mdwidth(dwc);
 
 	nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
 	nump = min_t(u32, nump, 16);
@@ -2575,12 +2573,10 @@ static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep)
 static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
 {
 	struct dwc3 *dwc = dep->dwc;
-	int mdwidth;
+	u32 mdwidth;
 	int size;
 
-	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
-	if (DWC3_IP_IS(DWC32))
-		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+	mdwidth = dwc3_mdwidth(dwc);
 
 	/* MDWIDTH is represented in bits, we need it in bytes */
 	mdwidth /= 8;
@@ -2622,12 +2618,10 @@ static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
 static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
 {
 	struct dwc3 *dwc = dep->dwc;
-	int mdwidth;
+	u32 mdwidth;
 	int size;
 
-	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
-	if (DWC3_IP_IS(DWC32))
-		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+	mdwidth = dwc3_mdwidth(dwc);
 
 	/* MDWIDTH is represented in bits, convert to bytes */
 	mdwidth /= 8;