This is a note to let you know that I've just added the patch titled
mmc: cqhci: Fix task clearing in CQE error recovery
to the 6.1-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:
mmc-cqhci-fix-task-clearing-in-cqe-error-recovery.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1de1b77982e1a1df9707cb11f9b1789e6b8919d4 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Fri, 3 Nov 2023 10:47:20 +0200
Subject: mmc: cqhci: Fix task clearing in CQE error recovery
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
commit 1de1b77982e1a1df9707cb11f9b1789e6b8919d4 upstream.
If a task completion notification (TCN) is received when there is no
outstanding task, the cqhci driver issues a "spurious TCN" warning. This
was observed to happen right after CQE error recovery.
When an error interrupt is received the driver runs recovery logic.
It halts the controller, clears all pending tasks, and then re-enables
it. On some platforms, like Intel Jasper Lake, a stale task completion
event was observed, regardless of the CQHCI_CLEAR_ALL_TASKS bit being set.
This results in either:
a) Spurious TC completion event for an empty slot.
b) Corrupted data being passed up the stack, as a result of premature
completion for a newly added task.
Rather than add a quirk for affected controllers, ensure tasks are cleared
by toggling CQHCI_ENABLE, which would happen anyway if
cqhci_clear_all_tasks() timed out. This is simpler and should be safe and
effective for all controllers.
Fixes: a4080225f51d ("mmc: cqhci: support for command queue enabled host")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Kornel Dulęba <korneld@xxxxxxxxxxxx>
Tested-by: Kornel Dulęba <korneld@xxxxxxxxxxxx>
Co-developed-by: Kornel Dulęba <korneld@xxxxxxxxxxxx>
Signed-off-by: Kornel Dulęba <korneld@xxxxxxxxxxxx>
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>
Link: https://lore.kernel.org/r/20231103084720.6886-7-adrian.hunter@xxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/cqhci-core.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
--- a/drivers/mmc/host/cqhci-core.c
+++ b/drivers/mmc/host/cqhci-core.c
@@ -1075,28 +1075,28 @@ static void cqhci_recovery_finish(struct
ok = cqhci_halt(mmc, CQHCI_FINISH_HALT_TIMEOUT);
- if (!cqhci_clear_all_tasks(mmc, CQHCI_CLEAR_TIMEOUT))
- ok = false;
-
/*
* The specification contradicts itself, by saying that tasks cannot be
* cleared if CQHCI does not halt, but if CQHCI does not halt, it should
* be disabled/re-enabled, but not to disable before clearing tasks.
* Have a go anyway.
*/
- if (!ok) {
- pr_debug("%s: cqhci: disable / re-enable\n", mmc_hostname(mmc));
- cqcfg = cqhci_readl(cq_host, CQHCI_CFG);
- cqcfg &= ~CQHCI_ENABLE;
- cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
- cqcfg |= CQHCI_ENABLE;
- cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
- /* Be sure that there are no tasks */
- ok = cqhci_halt(mmc, CQHCI_FINISH_HALT_TIMEOUT);
- if (!cqhci_clear_all_tasks(mmc, CQHCI_CLEAR_TIMEOUT))
- ok = false;
- WARN_ON(!ok);
- }
+ if (!cqhci_clear_all_tasks(mmc, CQHCI_CLEAR_TIMEOUT))
+ ok = false;
+
+ /* Disable to make sure tasks really are cleared */
+ cqcfg = cqhci_readl(cq_host, CQHCI_CFG);
+ cqcfg &= ~CQHCI_ENABLE;
+ cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
+
+ cqcfg = cqhci_readl(cq_host, CQHCI_CFG);
+ cqcfg |= CQHCI_ENABLE;
+ cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
+
+ cqhci_halt(mmc, CQHCI_FINISH_HALT_TIMEOUT);
+
+ if (!ok)
+ cqhci_clear_all_tasks(mmc, CQHCI_CLEAR_TIMEOUT);
cqhci_recover_mrqs(cq_host);
Patches currently in stable-queue which might be from adrian.hunter@xxxxxxxxx are
queue-6.1/mmc-block-be-sure-to-wait-while-busy-in-cqe-error-recovery.patch
queue-6.1/mmc-block-do-not-lose-cache-flush-during-cqe-error-recovery.patch
queue-6.1/mmc-sdhci-pci-gli-disable-lpm-during-initialization.patch
queue-6.1/mmc-block-retry-commands-in-cqe-error-recovery.patch
queue-6.1/mmc-cqhci-warn-of-halt-or-task-clear-failure.patch
queue-6.1/mmc-cqhci-fix-task-clearing-in-cqe-error-recovery.patch
queue-6.1/mmc-cqhci-increase-recovery-halt-timeout.patch
