bcm27xx: remove linux 5.10 compatibility

[openwrt/staging/chunkeey.git] / target / linux / bcm27xx / patches-5.10 / 950-0005-Revert-mailbox-avoid-timer-start-from-callback.patch

diff --git a/target/linux/bcm27xx/patches-5.10/950-0005-Revert-mailbox-avoid-timer-start-from-callback.patch b/target/linux/bcm27xx/patches-5.10/950-0005-Revert-mailbox-avoid-timer-start-from-callback.patch
deleted file mode 100644 (file)
index 5ec683f..0000000
--- a/target/linux/bcm27xx/patches-5.10/950-0005-Revert-mailbox-avoid-timer-start-from-callback.patch
+++ /dev/null
@@ -1,58 +0,0 @@
-From a8fb0d43b8acd25d68a0d2c24fd0260393148447 Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.com>
-Date: Tue, 3 Nov 2020 11:49:53 +0000
-Subject: [PATCH] Revert "mailbox: avoid timer start from callback"
-
-This reverts commit c7dacf5b0f32957b24ef29df1207dc2cd8307743.
-
-The Pi 400 shutdown/poweroff mechanism relies on being able to set
-a GPIO on the expander in the pm_power_off handler, something that
-requires two mailbox calls - GET_GPIO_STATE and SET_GPIO_STATE. A
-recent kernel change introduces a reasonable possibility that the
-GET call doesn't completes, and bisecting led to a commit from
-October that changes the timer usage of the mailbox.
-
-My theory is that there is a race condition in the new code that breaks
-the poll timer, but that it normally goes unnoticed because subsequent
-mailbox activity wakes it up again. The power-off mailbox calls happen
-at a time when other subsystems have been shut down, so if one of them
-fails then there is nothing to allow it to recover.
-
-See: https://github.com/raspberrypi/linux/issues/3941
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.com>
----
- drivers/mailbox/mailbox.c | 12 +++++-------
- 1 file changed, 5 insertions(+), 7 deletions(-)
-
---- a/drivers/mailbox/mailbox.c
-+++ b/drivers/mailbox/mailbox.c
-@@ -82,12 +82,9 @@ static void msg_submit(struct mbox_chan
- exit:
-       spin_unlock_irqrestore(&chan->lock, flags);
- 
--      /* kick start the timer immediately to avoid delays */
--      if (!err && (chan->txdone_method & TXDONE_BY_POLL)) {
--              /* but only if not already active */
--              if (!hrtimer_active(&chan->mbox->poll_hrt))
--                      hrtimer_start(&chan->mbox->poll_hrt, 0, HRTIMER_MODE_REL);
--      }
-+      if (!err && (chan->txdone_method & TXDONE_BY_POLL))
-+              /* kick start the timer immediately to avoid delays */
-+              hrtimer_start(&chan->mbox->poll_hrt, 0, HRTIMER_MODE_REL);
- }
- 
- static void tx_tick(struct mbox_chan *chan, int r)
-@@ -125,10 +122,11 @@ static enum hrtimer_restart txdone_hrtim
-               struct mbox_chan *chan = &mbox->chans[i];
- 
-               if (chan->active_req && chan->cl) {
--                      resched = true;
-                       txdone = chan->mbox->ops->last_tx_done(chan);
-                       if (txdone)
-                               tx_tick(chan, 0);
-+                      else
-+                              resched = true;
-               }
-       }
-