usb: dwc3: Get MDWIDTH for DWC_usb32

DWC_usb32 supports MDWIDTH value larger than 255 and up to 1023. The
field HWPARAMS6[9:8] stores the upper 2-bit values of the DWC_usb32's
MDWIDTH. Check that parameter and properly get the MDWIDTH for
DWC_usb32.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

drivers/usb/dwc3/core.h

@@ -366,6 +366,9 @@
 #define DWC3_GHWPARAMS6_SRPSUPPORT		BIT(10)
 #define DWC3_GHWPARAMS6_EN_FPGA			BIT(7)
 
+/* DWC_usb32 only */
+#define DWC3_GHWPARAMS6_MDWIDTH(n)		((n) & (0x3 << 8))
+
 /* Global HWPARAMS7 Register */
 #define DWC3_GHWPARAMS7_RAM1_DEPTH(n)	((n) & 0xffff)
 #define DWC3_GHWPARAMS7_RAM2_DEPTH(n)	(((n) >> 16) & 0xffff)

drivers/usb/dwc3/debugfs.c

@@ -635,13 +635,18 @@ 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			val;
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_TXFIFO);
 
 	/* Convert to bytes */
-	val *= DWC3_MDWIDTH(dwc->hwparams.hwparams0);
+	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
+	if (DWC3_IP_IS(DWC32))
+		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+
+	val *= mdwidth;
 	val >>= 3;
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);
@@ -654,13 +659,18 @@ 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			val;
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_RXFIFO);
 
 	/* Convert to bytes */
-	val *= DWC3_MDWIDTH(dwc->hwparams.hwparams0);
+	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
+	if (DWC3_IP_IS(DWC32))
+		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+
+	val *= mdwidth;
 	val >>= 3;
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);

drivers/usb/dwc3/gadget.c

@@ -2006,6 +2006,8 @@ static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
 
 	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);
 
 	nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
 	nump = min_t(u32, nump, 16);
@@ -2290,6 +2292,9 @@ static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
 	int size;
 
 	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
+	if (DWC3_IP_IS(DWC32))
+		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
+
 	/* MDWIDTH is represented in bits, we need it in bytes */
 	mdwidth /= 8;
 
@@ -2334,6 +2339,8 @@ static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
 	int size;
 
 	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
+	if (DWC3_IP_IS(DWC32))
+		mdwidth += DWC3_GHWPARAMS6_MDWIDTH(dwc->hwparams.hwparams6);
 
 	/* MDWIDTH is represented in bits, convert to bytes */
 	mdwidth /= 8;