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Disable CQE on mmc0 to fix I/O freezes on CM5 (#3793)

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Similarly to #3705, enabled CQE triggers I/O freezes usually on the first boot
when the swapfile is being created. While we disabled it for Yellow, with #3782
the issue started to appear on generic CM5 targets with the rpi5-64 image.

In the meantime it was discovered that there seems to be some relation with the
ext4lazyinit task, which happens as a result of data partition resize, yet it's
still unclear if the pattern of the access triggered by the concurrent FS
initialization is somehow responsible, or if another factor comes in play.
Disabling CQE yet makes the issue go away and serves as an acceptable
workaround.
This commit is contained in:
Jan Čermák 2025-01-15 18:00:56 +01:00 committed by GitHub
parent f3d83d2650
commit 4baca32658
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32
buildroot-external/board/raspberrypi/patches/linux/0003-dts-bcm2712-rpi-Disable-CQE-for-CM5-eMMC-to-work-aro.patch Normal file
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@ -0,0 +1,32 @@
From ec7a5ea27ef759c67225b1616e4266bcff0d7fb4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20=C4=8Cerm=C3=A1k?= <sairon@sairon.cz>
Date: Tue, 14 Jan 2025 18:27:20 +0100
Subject: [PATCH] dts: bcm2712-rpi: Disable CQE for CM5 eMMC to work around FS
lockups
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
With CQE enabled, HAOS first boot often fails during swap file initilization,
and leaves hanging on all I/O access. For some reason, this only happens when
an ext4lazyinit on the accessed partition hasn't been finished yet. Before the
real solution is found, disable CQE at the cost of a small performance cost.
Signed-off-by: Jan Čermák <sairon@sairon.cz>
---
arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5.dtsi b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5.dtsi
index 099d14ecf19a4..d49fc876cccc1 100644
--- a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5.dtsi
+++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5.dtsi
@@ -339,7 +339,7 @@ &sdio1 {
mmc-hs400-1_8v;
mmc-hs400-enhanced-strobe;
broken-cd;
- supports-cqe;
+ //supports-cqe;
status = "okay";
};