This is a note to let you know that I've just added the patch titled
usb: xhci-mtk: add some schedule error number
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-xhci-mtk-add-some-schedule-error-number.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit db2c0fd011227cb73028d73e62ebbd5355602506
Author: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
Date: Mon Mar 8 10:52:02 2021 +0800
usb: xhci-mtk: add some schedule error number
[ Upstream commit ccda8c224c0701caac007311d06a2de9543a7590 ]
This is used to provide more information about which case
causes bandwidth schedule failure.
Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/9771f44093053b581e9c4be4b7fb68d9fcecad08.1615170625.git.chunfeng.yun@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Stable-dep-of: 548011957d1d ("usb: xhci-mtk: relax TT periodic bandwidth allocation")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index 9a9685f74940..a6ec75bf2def 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -25,6 +25,13 @@
*/
#define TT_MICROFRAMES_MAX 9
+/* schedule error type */
+#define ESCH_SS_Y6 1001
+#define ESCH_SS_OVERLAP 1002
+#define ESCH_CS_OVERFLOW 1003
+#define ESCH_BW_OVERFLOW 1004
+#define ESCH_FIXME 1005
+
/* mtk scheduler bitmasks */
#define EP_BPKTS(p) ((p) & 0x7f)
#define EP_BCSCOUNT(p) (((p) & 0x7) << 8)
@@ -32,6 +39,24 @@
#define EP_BOFFSET(p) ((p) & 0x3fff)
#define EP_BREPEAT(p) (((p) & 0x7fff) << 16)
+static char *sch_error_string(int err_num)
+{
+ switch (err_num) {
+ case ESCH_SS_Y6:
+ return "Can't schedule Start-Split in Y6";
+ case ESCH_SS_OVERLAP:
+ return "Can't find a suitable Start-Split location";
+ case ESCH_CS_OVERFLOW:
+ return "The last Complete-Split is greater than 7";
+ case ESCH_BW_OVERFLOW:
+ return "Bandwidth exceeds the maximum limit";
+ case ESCH_FIXME:
+ return "FIXME, to be resolved";
+ default:
+ return "Unknown";
+ }
+}
+
static int is_fs_or_ls(enum usb_device_speed speed)
{
return speed == USB_SPEED_FULL || speed == USB_SPEED_LOW;
@@ -395,7 +420,7 @@ static int check_fs_bus_bw(struct mu3h_sch_ep_info *sch_ep, int offset)
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 -ERANGE;
+ return -ESCH_BW_OVERFLOW;
}
}
@@ -421,11 +446,11 @@ static int check_sch_tt(struct usb_device *udev,
* must never schedule Start-Split in Y6
*/
if (!(start_ss == 7 || last_ss < 6))
- return -ERANGE;
+ return -ESCH_SS_Y6;
for (i = 0; i < sch_ep->cs_count; i++)
if (test_bit(offset + i, tt->ss_bit_map))
- return -ERANGE;
+ return -ESCH_SS_OVERLAP;
} else {
u32 cs_count = DIV_ROUND_UP(sch_ep->maxpkt, FS_PAYLOAD_MAX);
@@ -435,14 +460,14 @@ static int check_sch_tt(struct usb_device *udev,
* must never schedule Start-Split in Y6
*/
if (start_ss == 6)
- return -ERANGE;
+ return -ESCH_SS_Y6;
/* one uframe for ss + one uframe for idle */
start_cs = (start_ss + 2) % 8;
last_cs = start_cs + cs_count - 1;
if (last_cs > 7)
- return -ERANGE;
+ return -ESCH_CS_OVERFLOW;
if (sch_ep->ep_type == ISOC_IN_EP)
extra_cs_count = (last_cs == 7) ? 1 : 2;
@@ -454,7 +479,7 @@ static int check_sch_tt(struct usb_device *udev,
cs_count = 7; /* HW limit */
if (test_bit(offset, tt->ss_bit_map))
- return -ERANGE;
+ return -ESCH_SS_OVERLAP;
sch_ep->cs_count = cs_count;
/* one for ss, the other for idle */
@@ -547,7 +572,7 @@ static int check_sch_bw(struct usb_device *udev,
u32 esit_boundary;
u32 min_num_budget;
u32 min_cs_count;
- int ret;
+ int ret = 0;
/*
* Search through all possible schedule microframes.
@@ -588,7 +613,7 @@ static int check_sch_bw(struct usb_device *udev,
/* check bandwidth */
if (min_bw > bw_boundary)
- return -ERANGE;
+ return ret ? ret : -ESCH_BW_OVERFLOW;
sch_ep->offset = min_index;
sch_ep->cs_count = min_cs_count;
@@ -765,7 +790,8 @@ int xhci_mtk_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
ret = check_sch_bw(udev, sch_bw, sch_ep);
if (ret) {
- xhci_err(xhci, "Not enough bandwidth!\n");
+ xhci_err(xhci, "Not enough bandwidth! (%s)\n",
+ sch_error_string(-ret));
return -ENOSPC;
}
}
