linux-kernel - [PATCH 0/1] Enable ddr modes on emmc2 of Raspberry Pi 4 B

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Message-Id: <20200829231509.543901-1-t.schramm@manjaro.org>
Date:   Sun, 30 Aug 2020 01:15:08 +0200
From:   Tobias Schramm <t.schramm@...jaro.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     devicetree@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org,
        Tobias Schramm <t.schramm@...jaro.org>
Subject: [PATCH 0/1] Enable ddr modes on emmc2 of Raspberry Pi 4 B

Currently both micro SD cards and eMMC storage attached to a Pi 4 are
running in single data rate mode only. However the controller used
supports dual data rate modes. This patch enables ddr modes for both
sd and mmc storage.

I've verified that there are no issues transferring data in ddr mode
using multiple micro SD cards and eMMC modules from different vendors.
Additionally I've checked signal integrity on the data lines at the micro
SD card slot and did not find any issues there either.

Tobias Schramm (1):
  ARM: dts: bcm2711: Enable ddr modes on emmc2 controller

 arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.28.0