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Reduce time of mmc0 interface random hangs on Yellow+CM5 boot (#3700)

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For yet unknown root cause, the eMMC interface sometimes fails to initialize
properly, delaying boot for up to 130 seconds. This can be reduced by ~100s by
disabling SD and SDIO modes on the sdio1 interface used for mmc0 before a
better patch is found.

(cherry picked from commit 489de0b2fb06aa6477c2c4ad34d4b9440e5a21ae)
This commit is contained in:
Jan Čermák 2024-12-02 15:19:38 +01:00 committed by Jan Čermák
parent 66405f102a
commit a355da2075
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1 changed files with 44 additions and 0 deletions
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44
buildroot-external/board/raspberrypi/yellow/patches/linux/0018-ARM-dts-bcm2712-yellow-Disable-SD-SDIO-modes-on-eMMC.patch Normal file
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@ -0,0 +1,44 @@
From 9639a7a0f20cbd4a7b9968f6a3ede4727d96d297 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20=C4=8Cerm=C3=A1k?= <sairon@sairon.cz>
Date: Thu, 28 Nov 2024 18:05:55 +0100
Subject: [PATCH] ARM: dts: bcm2712: yellow: Disable SD/SDIO modes on eMMC
interface
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
If the eMMC card is not initialized properly (probably a side-effect of its
usage in U-Boot), every command sent to it takes over 10 seconds before
timeout. With SD and SDIO modes not disabled in the device tree, it takes up
over 130 seconds before the card is reset. Disabling these two modes reduces
this by 100 seconds.
While this is added as a partial workaround for the issue, disabling these mode
should make no harm anyway.
Signed-off-by: Jan Čermák <sairon@sairon.cz>
---
.../boot/dts/broadcom/bcm2712-rpi-cm5-ha-yellow.dts | 10 ++++++++++
1 file changed, 10 insertions(+)
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 c85d608da2043..189c17fe2028e 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
@@ -851,6 +851,16 @@ &rp1_usb1 {
status = "disabled";
};
+/*
+ * Yellow doesn't need to use eMMC interface as SD/SDIO, disable those
+ * modes to speed up boot. This is particularly handy to work around
+ * an issue with eMMC initialization but won't harm in general.
+ */
+&sdio1 {
+ no-sdio;
+ no-sd;
+};
+
&leds {
led_act: led-act {
label = "act";