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

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merged 1 commit into from
Dec 2, 2024
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Disable CQE on mmc0 to fix I/O freezes on Yellow+CM5 #3705

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50 changes: 50 additions & 0 deletions ...rypi/yellow/patches/linux/0019-ARM-dts-bcm2712-yellow-Disable-CQE-on-eMMC-interface.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,50 @@
From 0d9aed86fbaf650cf15ea0977e05cee2980ed054 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20=C4=8Cerm=C3=A1k?= <[email protected]>
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 <[email protected]>
---
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";
};