4.9-stable patches

added patches:
	usb-core-reduce-power-on-good-delay-time-of-root-hub.patch

diff --git a/queue-4.9/series b/queue-4.9/series
index 97e243bfeb69643730de1e473e04802cd98fb35c..a7f59cd0841d6bcb90358b324790722a12973daf 100644 (file)
--- a/queue-4.9/series
+++ b/queue-4.9/series
@@ -63,3 +63,4 @@ sch_dsmark-fix-a-null-deref-in-qdisc_reset.patch
 mips-alchemy-xxs1500-add-gpio-au1000.h-header-file.patch
 mips-ralink-export-rt_sysc_membase-for-rt2880_wdt.c.patch
 hugetlbfs-hugetlb_fault_mutex_hash-cleanup.patch
+usb-core-reduce-power-on-good-delay-time-of-root-hub.patch

diff --git a/queue-4.9/usb-core-reduce-power-on-good-delay-time-of-root-hub.patch b/queue-4.9/usb-core-reduce-power-on-good-delay-time-of-root-hub.patch
new file mode 100644 (file)
index 0000000..28f7552
--- /dev/null
+++ b/queue-4.9/usb-core-reduce-power-on-good-delay-time-of-root-hub.patch
@@ -0,0 +1,39 @@
+From 90d28fb53d4a51299ff324dede015d5cb11b88a2 Mon Sep 17 00:00:00 2001
+From: Chunfeng Yun <chunfeng.yun@mediatek.com>
+Date: Sat, 10 Apr 2021 09:20:45 +0800
+Subject: usb: core: reduce power-on-good delay time of root hub
+
+From: Chunfeng Yun <chunfeng.yun@mediatek.com>
+
+commit 90d28fb53d4a51299ff324dede015d5cb11b88a2 upstream.
+
+Return the exactly delay time given by root hub descriptor,
+this helps to reduce resume time etc.
+
+Due to the root hub descriptor is usually provided by the host
+controller driver, if there is compatibility for a root hub,
+we can fix it easily without affect other root hub
+
+Acked-by: Alan Stern <stern@rowland.harvard.edu>
+Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
+Link: https://lore.kernel.org/r/1618017645-12259-1-git-send-email-chunfeng.yun@mediatek.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/usb/core/hub.h |    6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+--- a/drivers/usb/core/hub.h
++++ b/drivers/usb/core/hub.h
+@@ -151,8 +151,10 @@ static inline unsigned hub_power_on_good
+ {
+       unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
+ 
+-      /* Wait at least 100 msec for power to become stable */
+-      return max(delay, 100U);
++      if (!hub->hdev->parent) /* root hub */
++              return delay;
++      else /* Wait at least 100 msec for power to become stable */
++              return max(delay, 100U);
+ }
+ 
+ static inline int hub_port_debounce_be_connected(struct usb_hub *hub,