From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Quentin Schulz <foss+kernel@0leil.net>,
Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>,
Quentin Schulz <quentin.schulz@theobroma-systems.com>,
Heiko Stuebner <heiko@sntech.de>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 04/22] arm64: dts: rockchip: fix rk3399-puma eMMC HS400 signal integrity
Date: Mon, 21 Mar 2022 14:51:35 +0100 [thread overview]
Message-ID: <20220321133217.734580952@linuxfoundation.org> (raw)
In-Reply-To: <20220321133217.602054917@linuxfoundation.org>
From: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>
[ Upstream commit 62966cbdda8a92f82d966a45aa671e788b2006f7 ]
There are signal integrity issues running the eMMC at 200MHz on Puma
RK3399-Q7.
Similar to the work-around found for RK3399 Gru boards, lowering the
frequency to 100MHz made the eMMC much more stable, so let's lower the
frequency to 100MHz.
It might be possible to run at 150MHz as on RK3399 Gru boards but only
100MHz was extensively tested.
Cc: Quentin Schulz <foss+kernel@0leil.net>
Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20220119134948.1444965-1-quentin.schulz@theobroma-systems.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
index 0d5679380b2a..70fe6013d17c 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
@@ -484,6 +484,12 @@
};
&sdhci {
+ /*
+ * Signal integrity isn't great at 200MHz but 100MHz has proven stable
+ * enough.
+ */
+ max-frequency = <100000000>;
+
bus-width = <8>;
mmc-hs400-1_8v;
mmc-hs400-enhanced-strobe;
--
2.34.1
next prev parent reply other threads:[~2022-03-21 13:55 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 13:51 [PATCH 4.14 00/22] 4.14.273-rc1 review Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 01/22] sctp: fix the processing for INIT chunk Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 02/22] sctp: fix the processing for INIT_ACK chunk Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 03/22] xfrm: Fix xfrm migrate issues when address family changes Greg Kroah-Hartman
2022-03-21 13:51 ` Greg Kroah-Hartman [this message]
2022-03-21 13:51 ` [PATCH 4.14 05/22] ARM: dts: rockchip: fix a typo on rk3288 crypto-controller Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 06/22] MIPS: smp: fill in sibling and core maps earlier Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 07/22] ARM: 9178/1: fix unmet dependency on BITREVERSE for HAVE_ARCH_BITREVERSE Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 08/22] can: rcar_canfd: rcar_canfd_channel_probe(): register the CAN device when fully ready Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 09/22] atm: firestream: check the return value of ioremap() in fs_init() Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 10/22] nl80211: Update bss channel on channel switch for P2P_CLIENT Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 11/22] tcp: make tcp_read_sock() more robust Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 12/22] sfc: extend the locking on mcdi->seqno Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 13/22] kselftest/vm: fix tests build with old libc Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 14/22] fs: sysfs_emit: Remove PAGE_SIZE alignment check Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 15/22] efi: fix return value of __setup handlers Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 16/22] net/packet: fix slab-out-of-bounds access in packet_recvmsg() Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 17/22] atm: eni: Add check for dma_map_single Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 18/22] net: handle ARPHRD_PIMREG in dev_is_mac_header_xmit() Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 19/22] usb: gadget: rndis: prevent integer overflow in rndis_set_response() Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 20/22] usb: gadget: Fix use-after-free bug by not setting udc->dev.driver Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 21/22] Input: aiptek - properly check endpoint type Greg Kroah-Hartman
2022-03-21 13:51 ` [PATCH 4.14 22/22] perf symbols: Fix symbol size calculation condition Greg Kroah-Hartman
2022-03-21 19:08 ` [PATCH 4.14 00/22] 4.14.273-rc1 review Jon Hunter
2022-03-22 1:59 ` Guenter Roeck
2022-03-22 15:27 ` Naresh Kamboju
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=20220321133217.734580952@linuxfoundation.org \
--to=gregkh@linuxfoundation.org \
--cc=foss+kernel@0leil.net \
--cc=heiko@sntech.de \
--cc=jakob.unterwurzacher@theobroma-systems.com \
--cc=linux-kernel@vger.kernel.org \
--cc=quentin.schulz@theobroma-systems.com \
--cc=sashal@kernel.org \
--cc=stable@vger.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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).