LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Tobias Schramm <t.schramm@manjaro.org>
To: Rob Herring <robh+dt@kernel.org>,
	Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: devicetree@vger.kernel.org,
	bcm-kernel-feedback-list@broadcom.com,
	linux-kernel@vger.kernel.org,
	Tobias Schramm <t.schramm@manjaro.org>
Subject: [PATCH 0/1] Enable ddr modes on emmc2 of Raspberry Pi 4 B
Date: Sun, 30 Aug 2020 01:15:08 +0200
Message-ID: <20200829231509.543901-1-t.schramm@manjaro.org> (raw)

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


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-29 23:15 Tobias Schramm [this message]
2020-08-29 23:15 ` [PATCH 1/1] ARM: dts: bcm2711: Enable ddr modes on emmc2 controller Tobias Schramm
2020-08-31 22:00   ` Florian Fainelli

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200829231509.543901-1-t.schramm@manjaro.org \
    --to=t.schramm@manjaro.org \
    --cc=bcm-kernel-feedback-list@broadcom.com \
    --cc=devicetree@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=nsaenzjulienne@suse.de \
    --cc=robh+dt@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git