[PATCH 1/6] usb: xhci: refactor xhci_set_configuration

[Janne Grunau via B4 Relay]

From: Janne Grunau <j at jannau.net>

In the next step endpoints for multiple interfaces are set up. Move most
of the per endpoint initialization to separate function to avoid another
identation level.

Signed-off-by: Janne Grunau <j at jannau.net>
---
 drivers/usb/host/xhci.c | 119 +++++++++++++++++++++++++++++-------------------
 1 file changed, 73 insertions(+), 46 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index d13cbff9b3..534c4b973f 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -475,67 +475,34 @@ static int xhci_configure_endpoints(struct usb_device *udev, bool ctx_change)
 }
 
 /**
- * Configure the endpoint, programming the device contexts.
+ * Fill endpoint contexts for interface descriptor ifdesc.
  *
- * @param udev	pointer to the USB device structure
- * Return: returns the status of the xhci_configure_endpoints
+ * @param udev		pointer to the USB device structure
+ * @param ctrl		pointer to the xhci pravte device structure
+ * @param virt_dev	pointer to the xhci virtual device structure
+ * @param ifdesc	pointer to the USB interface config descriptor
+ * Return: returns the status of xhci_init_ep_contexts_if
  */
-static int xhci_set_configuration(struct usb_device *udev)
+static int xhci_init_ep_contexts_if(struct usb_device *udev,
+				    struct xhci_ctrl *ctrl,
+				    struct xhci_virt_device *virt_dev,
+				    struct usb_interface *ifdesc
+	)
 {
-	struct xhci_container_ctx *in_ctx;
-	struct xhci_container_ctx *out_ctx;
-	struct xhci_input_control_ctx *ctrl_ctx;
-	struct xhci_slot_ctx *slot_ctx;
 	struct xhci_ep_ctx *ep_ctx[MAX_EP_CTX_NUM];
 	int cur_ep;
-	int max_ep_flag = 0;
 	int ep_index;
 	unsigned int dir;
 	unsigned int ep_type;
-	struct xhci_ctrl *ctrl = xhci_get_ctrl(udev);
-	int num_of_ep;
-	int ep_flag = 0;
 	u64 trb_64 = 0;
-	int slot_id = udev->slot_id;
-	struct xhci_virt_device *virt_dev = ctrl->devs[slot_id];
-	struct usb_interface *ifdesc;
 	u32 max_esit_payload;
 	unsigned int interval;
 	unsigned int mult;
 	unsigned int max_burst;
 	unsigned int avg_trb_len;
 	unsigned int err_count = 0;
+	int num_of_ep = ifdesc->no_of_ep;
 
-	out_ctx = virt_dev->out_ctx;
-	in_ctx = virt_dev->in_ctx;
-
-	num_of_ep = udev->config.if_desc[0].no_of_ep;
-	ifdesc = &udev->config.if_desc[0];
-
-	ctrl_ctx = xhci_get_input_control_ctx(in_ctx);
-	/* Initialize the input context control */
-	ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG);
-	ctrl_ctx->drop_flags = 0;
-
-	/* EP_FLAG gives values 1 & 4 for EP1OUT and EP2IN */
-	for (cur_ep = 0; cur_ep < num_of_ep; cur_ep++) {
-		ep_flag = xhci_get_ep_index(&ifdesc->ep_desc[cur_ep]);
-		ctrl_ctx->add_flags |= cpu_to_le32(1 << (ep_flag + 1));
-		if (max_ep_flag < ep_flag)
-			max_ep_flag = ep_flag;
-	}
-
-	xhci_inval_cache((uintptr_t)out_ctx->bytes, out_ctx->size);
-
-	/* slot context */
-	xhci_slot_copy(ctrl, in_ctx, out_ctx);
-	slot_ctx = xhci_get_slot_ctx(ctrl, in_ctx);
-	slot_ctx->dev_info &= ~(cpu_to_le32(LAST_CTX_MASK));
-	slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(max_ep_flag + 1) | 0);
-
-	xhci_endpoint_copy(ctrl, in_ctx, out_ctx, 0);
-
-	/* filling up ep contexts */
 	for (cur_ep = 0; cur_ep < num_of_ep; cur_ep++) {
 		struct usb_endpoint_descriptor *endpt_desc = NULL;
 		struct usb_ss_ep_comp_descriptor *ss_ep_comp_desc = NULL;
@@ -561,7 +528,8 @@ static int xhci_set_configuration(struct usb_device *udev)
 		avg_trb_len = max_esit_payload;
 
 		ep_index = xhci_get_ep_index(endpt_desc);
-		ep_ctx[ep_index] = xhci_get_ep_ctx(ctrl, in_ctx, ep_index);
+		ep_ctx[ep_index] = xhci_get_ep_ctx(ctrl, virt_dev->in_ctx,
+						   ep_index);
 
 		/* Allocate the ep rings */
 		virt_dev->eps[ep_index].ring = xhci_ring_alloc(ctrl, 1, true);
@@ -614,6 +582,65 @@ static int xhci_set_configuration(struct usb_device *udev)
 		}
 	}
 
+	return 0;
+}
+
+/**
+ * Configure the endpoint, programming the device contexts.
+ *
+ * @param udev	pointer to the USB device structure
+ * Return: returns the status of the xhci_configure_endpoints
+ */
+static int xhci_set_configuration(struct usb_device *udev)
+{
+	struct xhci_container_ctx *out_ctx;
+	struct xhci_container_ctx *in_ctx;
+	struct xhci_input_control_ctx *ctrl_ctx;
+	struct xhci_slot_ctx *slot_ctx;
+	int err;
+	int cur_ep;
+	int max_ep_flag = 0;
+	struct xhci_ctrl *ctrl = xhci_get_ctrl(udev);
+	int num_of_ep;
+	int ep_flag = 0;
+	int slot_id = udev->slot_id;
+	struct xhci_virt_device *virt_dev = ctrl->devs[slot_id];
+	struct usb_interface *ifdesc;
+
+	out_ctx = virt_dev->out_ctx;
+	in_ctx = virt_dev->in_ctx;
+
+	num_of_ep = udev->config.if_desc[0].no_of_ep;
+	ifdesc = &udev->config.if_desc[0];
+
+	ctrl_ctx = xhci_get_input_control_ctx(in_ctx);
+	/* Initialize the input context control */
+	ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG);
+	ctrl_ctx->drop_flags = 0;
+
+	/* EP_FLAG gives values 1 & 4 for EP1OUT and EP2IN */
+	for (cur_ep = 0; cur_ep < num_of_ep; cur_ep++) {
+		ep_flag = xhci_get_ep_index(&ifdesc->ep_desc[cur_ep]);
+		ctrl_ctx->add_flags |= cpu_to_le32(1 << (ep_flag + 1));
+		if (max_ep_flag < ep_flag)
+			max_ep_flag = ep_flag;
+	}
+
+	xhci_inval_cache((uintptr_t)out_ctx->bytes, out_ctx->size);
+
+	/* slot context */
+	xhci_slot_copy(ctrl, in_ctx, out_ctx);
+	slot_ctx = xhci_get_slot_ctx(ctrl, in_ctx);
+	slot_ctx->dev_info &= ~(cpu_to_le32(LAST_CTX_MASK));
+	slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(max_ep_flag + 1) | 0);
+
+	xhci_endpoint_copy(ctrl, in_ctx, out_ctx, 0);
+
+	/* filling up ep contexts */
+	err = xhci_init_ep_contexts_if(udev, ctrl, virt_dev, ifdesc);
+	if (err < 0)
+		return err;
+
 	return xhci_configure_endpoints(udev, false);
 }
 

-- 
2.43.2