linux-kernel - [PATCH v2 2/3] usb: xhci-mtk: delay association of tt and ep

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Date:   Thu, 10 Dec 2020 18:47:46 +0800
From:   Ikjoon Jang <ikjn@...omium.org>
To:     linux-mediatek@...ts.infradead.org, linux-usb@...r.kernel.org
Cc:     Zhanyong Wang <zhanyong.wang@...iatek.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Tianping Fang <tianping.fang@...iatek.com>,
        Ikjoon Jang <ikjn@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] usb: xhci-mtk: delay association of tt and ep

xhci-mtk creates internal data structures for representing the
relationship between endpoint and TT.

This patch simply delays its association between endpoint and TT
when it's really loaded onto internal bandwidth table.

This is a preparation step for fixing unreleased periodic
TT bandwidth data, no functional changes.

Signed-off-by: Ikjoon Jang <ikjn@...omium.org>
---

 drivers/usb/host/xhci-mtk-sch.c | 40 ++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 21 deletions(-)

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index c334b6d76479..439391f1dc78 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -174,7 +174,6 @@ static struct mu3h_sch_ep_info *create_sch_ep(struct usb_device *udev,
 	struct usb_host_endpoint *ep, struct xhci_ep_ctx *ep_ctx)
 {
 	struct mu3h_sch_ep_info *sch_ep;
-	struct mu3h_sch_tt *tt = NULL;
 	u32 len_bw_budget_table;
 	size_t mem_size;
 
@@ -192,15 +191,6 @@ static struct mu3h_sch_ep_info *create_sch_ep(struct usb_device *udev,
 	if (!sch_ep)
 		return ERR_PTR(-ENOMEM);
 
-	if (is_fs_or_ls(udev->speed)) {
-		tt = find_tt(udev);
-		if (IS_ERR(tt)) {
-			kfree(sch_ep);
-			return ERR_PTR(-ENOMEM);
-		}
-	}
-
-	sch_ep->sch_tt = tt;
 	sch_ep->ep = ep;
 
 	return sch_ep;
@@ -377,10 +367,10 @@ static void update_bus_bw(struct mu3h_sch_bw_info *sch_bw,
 	}
 }
 
-static int check_sch_tt(struct usb_device *udev,
-	struct mu3h_sch_ep_info *sch_ep, u32 offset)
+static int check_sch_tt(struct mu3h_sch_tt *tt,
+			struct mu3h_sch_ep_info *sch_ep,
+			u32 offset)
 {
-	struct mu3h_sch_tt *tt = sch_ep->sch_tt;
 	u32 extra_cs_count;
 	u32 fs_budget_start;
 	u32 start_ss, last_ss;
@@ -450,10 +440,9 @@ static int check_sch_tt(struct usb_device *udev,
 	return 0;
 }
 
-static void update_sch_tt(struct usb_device *udev,
-	struct mu3h_sch_ep_info *sch_ep)
+static void update_sch_tt(struct mu3h_sch_tt *tt,
+			  struct mu3h_sch_ep_info *sch_ep)
 {
-	struct mu3h_sch_tt *tt = sch_ep->sch_tt;
 	u32 base, num_esit;
 	int i, j;
 
@@ -465,10 +454,12 @@ static void update_sch_tt(struct usb_device *udev,
 	}
 
 	list_add_tail(&sch_ep->tt_endpoint, &tt->ep_list);
+	sch_ep->sch_tt = tt;
 }
 
 static int check_sch_bw(struct usb_device *udev,
-	struct mu3h_sch_bw_info *sch_bw, struct mu3h_sch_ep_info *sch_ep)
+			struct mu3h_sch_bw_info *sch_bw,
+			struct mu3h_sch_ep_info *sch_ep)
 {
 	u32 offset;
 	u32 esit;
@@ -480,8 +471,14 @@ static int check_sch_bw(struct usb_device *udev,
 	u32 min_cs_count;
 	bool tt_offset_ok = false;
 	int ret;
+	struct mu3h_sch_tt *tt = NULL;
 
 	esit = sch_ep->esit;
+	if (is_fs_or_ls(udev->speed)) {
+		tt = find_tt(udev);
+		if (IS_ERR(tt))
+			return -ENOMEM;
+	}
 
 	/*
 	 * Search through all possible schedule microframes.
@@ -493,7 +490,7 @@ static int check_sch_bw(struct usb_device *udev,
 	min_num_budget = sch_ep->num_budget_microframes;
 	for (offset = 0; offset < esit; offset++) {
 		if (is_fs_or_ls(udev->speed)) {
-			ret = check_sch_tt(udev, sch_ep, offset);
+			ret = check_sch_tt(tt, sch_ep, offset);
 			if (ret)
 				continue;
 			else
@@ -531,10 +528,11 @@ static int check_sch_bw(struct usb_device *udev,
 
 	if (is_fs_or_ls(udev->speed)) {
 		/* all offset for tt is not ok*/
-		if (!tt_offset_ok)
+		if (!tt_offset_ok) {
+			drop_tt(udev);
 			return -ERANGE;
-
-		update_sch_tt(udev, sch_ep);
+		}
+		update_sch_tt(tt, sch_ep);
 	}
 
 	/* update bus bandwidth info */
-- 
2.29.2.576.ga3fc446d84-goog