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Disable CQE on mmc0 to fix I/O freezes on Yellow+CM5 (#3705)

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The I/O operations on the eMMC can sometimes fail and lock up completely, and
disabling CQE on the sdio1 (mmc0) interface seems to solve the issue. While it
is a known (and potentially resolved) issue [1] for SD cards in Raspberry Pi's
Linux fork, it is not acknowledged neither resolved for CM5's eMMC. With CQE
enabled, the device usually locks up within the first 10 first boots, when the
swap file is being created. After disabling CQE, no error occurred after more
that 100 cold boots (every time with swap file removed).

[1] https://github.com/raspberrypi/linuxissues/6349

(cherry picked from commit c514d6b4825e4d72a0f3bfac26a5d3a203390e08)
This commit is contained in:
Jan Čermák 2024-12-02 16:45:35 +01:00 committed by Jan Čermák
parent a355da2075
commit 3df7743633
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1 changed files with 50 additions and 0 deletions
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buildroot-external/board/raspberrypi/yellow/patches/linux/0019-ARM-dts-bcm2712-yellow-Disable-CQE-on-eMMC-interface.patch Normal file
View File

@ -0,0 +1,50 @@
From 0d9aed86fbaf650cf15ea0977e05cee2980ed054 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20=C4=8Cerm=C3=A1k?= <sairon@sairon.cz>
Date: Mon, 2 Dec 2024 16:07:00 +0100
Subject: [PATCH] ARM: dts: bcm2712: yellow: Disable CQE on eMMC interface
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Testing shows that enabling CQE causes random hangs on I/O operations, often
during the swap boostrapping on the first boot:
[ 242.826099] Tainted: G C 6.6.51-haos-raspi #54
[ 242.832463] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.840429] INFO: task jbd2/mmcblk0p7-:300 blocked for more than 120 seconds.
[ 242.847572] Tainted: G C 6.6.51-haos-raspi #54
[ 242.853928] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.861789] INFO: task jbd2/mmcblk0p8-:344 blocked for more than 120 seconds.
[ 242.868926] Tainted: G C 6.6.51-haos-raspi #54
[ 242.875277] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.883149] INFO: task systemd-timesyn:569 blocked for more than 120 seconds.
[ 242.890282] Tainted: G C 6.6.51-haos-raspi #54
[ 242.896628] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.904522] INFO: task dockerd:606 blocked for more than 120 seconds.
[ 242.910958] Tainted: G C 6.6.51-haos-raspi #54
[ 242.917304] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.925200] INFO: task runc:[2:INIT]:1504 blocked for more than 120 seconds.
[ 242.932249] Tainted: G C 6.6.51-haos-raspi #54
[ 242.938595] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
This is a known issue currently for some SD cards but it hasn't been
acknowledged for eMMC yet. By removing the CQE capability, the issue seems to
go away.
Signed-off-by: Jan Čermák <sairon@sairon.cz>
---
arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts | 1 -
1 file changed, 1 deletion(-)
diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts
index 189c17fe2028e..469d0fdc971a8 100644
--- a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts
+++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts
@@ -352,7 +352,6 @@ &sdio1 {
mmc-hs400-1_8v;
mmc-hs400-enhanced-strobe;
broken-cd;
- supports-cqe;
status = "okay";
};