linux-kernel - [PATCH 0/4] BCM2711's sdhci-iproc CMD timeouts

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Message-Id: <20210322185816.27582-1-nsaenz@kernel.org>
Date:   Mon, 22 Mar 2021 19:58:13 +0100
From:   Nicolas Saenz Julienne <nsaenz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        Saenz Julienne <nsaenz@...nel.org>
Cc:     f.fainelli@...il.com, phil@...pberrypi.com,
        tim.gover@...pberrypi.com, adrian.hunter@...el.com,
        sbranden@...adcom.com, alcooperx@...il.com, nsaenzjulienne@...e.de,
        linux-kernel@...r.kernel.org, ulf.hansson@...aro.org
Subject: [PATCH 0/4] BCM2711's sdhci-iproc CMD timeouts

This series tries to address rather odd behavior from BCM2711's
integration of sdhci-iproc (Raspberry Pi 4's SoC). The controller will
timeout on SDHCI CMDs under the following conditions:

 - No SD card plugged in (the card polling thread is running, CD irq disabled).
 - BCM2711's VPU clock configured at 500MHz or more, lower clocks are OK.

There is no specific command that will time out, it seems random.

I found out that by bumping the controller's frequency to 150MHz the
issue disapears. So let's do that.

Regards,
Nicolas

---

Nicolas Saenz Julienne (4):
  dt-bindings: mmc: iproc-sdhci: Convert to json-schema
  dt-bindings: mmc: iproc-sdhci: Add clock-frequency support
  mmc: sdhci-iproc: Set clock frequency as per DT
  ARM: dts: Fix-up EMMC2 controller's frequency

 .../bindings/mmc/brcm,iproc-sdhci.yaml        | 64 +++++++++++++++++++
 .../bindings/mmc/brcm,sdhci-iproc.txt         | 37 -----------
 arch/arm/boot/dts/bcm2711-rpi-4-b.dts         |  6 ++
 drivers/mmc/host/sdhci-iproc.c                | 10 +++
 4 files changed, 80 insertions(+), 37 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mmc/brcm,iproc-sdhci.yaml
 delete mode 100644 Documentation/devicetree/bindings/mmc/brcm,sdhci-iproc.txt

-- 
2.30.2