Revert "usb: xhci-mtk: relax TT periodic bandwidth allocation"

As discussed in following patch:
https://patchwork.kernel.org/patch/12420339

No need calculate number of uframes again, but should use value
form check_sch_tt(), if we plan to remove extra CS, also can do
it in check_sch_tt(). So revert this patch, and prepare to send
new patch for it.

This reverts commit 5480119.

Cc: Ikjoon Jang <ikjn@chromium.org>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20210820065913.64490-1-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-mtk-sch.c

@@ -459,17 +459,16 @@ static int check_fs_bus_bw(struct mu3h_sch_ep_info *sch_ep, int offset)
 	u32 num_esit, tmp;
 	int base;
 	int i, j;
-	u8 uframes = DIV_ROUND_UP(sch_ep->maxpkt, FS_PAYLOAD_MAX);
 
 	num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
-
-	if (sch_ep->ep_type == INT_IN_EP || sch_ep->ep_type == ISOC_IN_EP)
-		offset++;
-
 	for (i = 0; i < num_esit; i++) {
 		base = offset + i * sch_ep->esit;
 
-		for (j = 0; j < uframes; j++) {
+		/*
+		 * Compared with hs bus, no matter what ep type,
+		 * the hub will always delay one uframe to send data
+		 */
+		for (j = 0; j < sch_ep->cs_count; j++) {
 			tmp = tt->fs_bus_bw[base + j] + sch_ep->bw_cost_per_microframe;
 			if (tmp > FS_PAYLOAD_MAX)
 				return -ESCH_BW_OVERFLOW;
@@ -547,8 +546,6 @@ static void update_sch_tt(struct mu3h_sch_ep_info *sch_ep, bool used)
 	u32 base, num_esit;
 	int bw_updated;
 	int i, j;
-	int offset = sch_ep->offset;
-	u8 uframes = DIV_ROUND_UP(sch_ep->maxpkt, FS_PAYLOAD_MAX);
 
 	num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
 
@@ -557,13 +554,10 @@ static void update_sch_tt(struct mu3h_sch_ep_info *sch_ep, bool used)
 	else
 		bw_updated = -sch_ep->bw_cost_per_microframe;
 
-	if (sch_ep->ep_type == INT_IN_EP || sch_ep->ep_type == ISOC_IN_EP)
-		offset++;
-
 	for (i = 0; i < num_esit; i++) {
-		base = offset + i * sch_ep->esit;
+		base = sch_ep->offset + i * sch_ep->esit;
 
-		for (j = 0; j < uframes; j++)
+		for (j = 0; j < sch_ep->cs_count; j++)
 			tt->fs_bus_bw[base + j] += bw_updated;
 	}