usb: dwc2: gadget: Add dwc2_gadget_read_ep_interrupts function

Reads and returns interrupts for given endpoint, by masking epint_reg
with corresponding mask.

Tested-by: John Keeping <john@metanate.com>
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

1 files changed, 29 insertions, 1 deletions

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 2cef7a9cb527..8139efdf00fb 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -1947,6 +1947,34 @@ static void dwc2_hsotg_complete_in(struct dwc2_hsotg *hsotg,
 }
 
 /**
+ * dwc2_gadget_read_ep_interrupts - reads interrupts for given ep
+ * @hsotg: The device state.
+ * @idx: Index of ep.
+ * @dir_in: Endpoint direction 1-in 0-out.
+ *
+ * Reads for endpoint with given index and direction, by masking
+ * epint_reg with coresponding mask.
+ */
+static u32 dwc2_gadget_read_ep_interrupts(struct dwc2_hsotg *hsotg,
+                                          unsigned int idx, int dir_in)
+{
+        u32 epmsk_reg = dir_in ? DIEPMSK : DOEPMSK;
+        u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx);
+        u32 ints;
+        u32 mask;
+        u32 diepempmsk;
+
+        mask = dwc2_readl(hsotg->regs + epmsk_reg);
+        diepempmsk = dwc2_readl(hsotg->regs + DIEPEMPMSK);
+        mask |= ((diepempmsk >> idx) & 0x1) ? DIEPMSK_TXFIFOEMPTY : 0;
+        mask |= DXEPINT_SETUP_RCVD;
+
+        ints = dwc2_readl(hsotg->regs + epint_reg);
+        ints &= mask;
+        return ints;
+}
+
+/**
  * dwc2_hsotg_epint - handle an in/out endpoint interrupt
  * @hsotg: The driver state
  * @idx: The index for the endpoint (0..15)
@@ -1964,7 +1992,7 @@ static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx,
         u32 ints;
         u32 ctrl;
 
-        ints = dwc2_readl(hsotg->regs + epint_reg);
+        ints = dwc2_gadget_read_ep_interrupts(hsotg, idx, dir_in);
         ctrl = dwc2_readl(hsotg->regs + epctl_reg);
 
         /* Clear endpoint interrupts */