Public bug reported:
Summary:
----------------
The kernel config `CONFIG_MMC_SDHCI_OF_DWCMSHC` is not enabled. This is
required by the RP1 peripheral controller so that the Raspberry Pi 5 leverages
the SDIO bus.
Description:
----------------
The SD card attached to a Raspberry Pi Compute Module 5 via GPIOs 22-27
is not working properly, although the `sdio` / `sdio-pi5` overlay is
present. In Raspberry Pi OS, everything works fine. I tried different
kernels, distros, and configurations. I found out that the overlay
loads, the clocks appear, but no MMC host binds. Finally, I discovered
that the driver `CONFIG_MMC_SDHCI_OF_DWCMSHC` is not enabled in the
Ubuntu kernel for Raspberry Pi devices, which is necessary for the RP1
SDIO controller.
Evidence:
----------------
The `rp1_mmc0` and `rp1_mmc1` nodes in RP1 dtsi
(arch/arm64/boot/dts/broadcom/rp1.dtsi) are compatible with
`raspberrypi,rp1-dwcmshc`. This is implemented by the `sdhci-of-dwcmshc` driver
(drivers/mmc/host/sdhci-of-dwcmshc.c) and enabled by the kernel config
`CONFIG_MMC_SDHCI_OF_DWCMSHC`.
Furthermore, the RP1 datasheet states that the `SDIO controller is a Synopsys
MSHC peripheral v1.70a`.
Hardware:
----------------
- Raspberry Pi 5
- Raspberry Pi Compute Module 5
Ubuntu release:
----------------
Description: Ubuntu 24.04.3 LTS
Release: 24.04
Package affected:
----------------
linux-raspi:
Installed: (none)
Candidate: 6.8.0-1043.47
Version table:
6.8.0-1043.47 500
500 http://ports.ubuntu.com/ubuntu-ports noble-updates/main arm64
Packages
500 http://ports.ubuntu.com/ubuntu-ports noble-security/main arm64
Packages
6.8.0-1004.4 500
500 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 Packages
Proposed fix:
----------------
Set the kernel config `CONFIG_MMC_SDHCI_OF_DWCMSHC` to module by default. Patch
attached.
Others:
----------------
- https://forums.raspberrypi.com/viewtopic.php?t=392105
** Affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: New
** Tags: linux-raspi raspberry-pi-5 raspberry-pi-cm5 rp1 sdhci-of-dwcmshc sdio
** Patch added: "Linux kernel config patch."
https://bugs.launchpad.net/bugs/2136415/+attachment/5934196/+files/0001-linux-raspi-enable-sdhci-of-dwcmshc-driver-for-rp1-sdio.patch
** Tags added: linux-raspi
** Tags added: sdio
** Tags removed: sdio
** Tags added: raspberry-pi-5 raspberry-pi-cm5 rp1 sdhci-of-dwcmshc sdio
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2136415
Title:
RP1's sdio controller requires sdhci-of-dwcmshc driver
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/2136415/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
