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 5.16 06/28] arm64: dts: rockchip: fix rk3399-puma eMMC HS400 signal integrity
Date: Thu, 17 Mar 2022 13:45:57 +0100 [thread overview]
Message-ID: <20220317124526.953096814@linuxfoundation.org> (raw)
In-Reply-To: <20220317124526.768423926@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 002ece51c3ba..08fa00364b42 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
@@ -439,6 +439,12 @@
};
&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:[~2022-03-17 12:55 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-17 12:45 [PATCH 5.16 00/28] 5.16.16-rc1 review Greg Kroah-Hartman
2022-03-17 12:45 ` [PATCH 5.16 01/28] Revert "xfrm: state and policy should fail if XFRMA_IF_ID 0" Greg Kroah-Hartman
2022-03-17 12:45 ` [PATCH 5.16 02/28] arm64: dts: rockchip: fix dma-controller node names on rk356x Greg Kroah-Hartman
2022-03-17 12:45 ` [PATCH 5.16 03/28] arm64: dts: rockchip: fix rk3399-puma-haikou USB OTG mode Greg Kroah-Hartman
2022-03-17 12:45 ` [PATCH 5.16 04/28] xfrm: Check if_id in xfrm_migrate Greg Kroah-Hartman
2022-03-17 12:45 ` [PATCH 5.16 05/28] xfrm: Fix xfrm migrate issues when address family changes Greg Kroah-Hartman
2022-03-17 12:45 ` Greg Kroah-Hartman [this message]
2022-03-17 12:45 ` [PATCH 5.16 07/28] arm64: dts: rockchip: align pl330 node name with dtschema Greg Kroah-Hartman
2022-03-17 12:45 ` [PATCH 5.16 08/28] arm64: dts: rockchip: reorder rk3399 hdmi clocks Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 09/28] arm64: dts: agilex: use the compatible "intel,socfpga-agilex-hsotg" Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 10/28] ARM: dts: rockchip: reorder rk322x hmdi clocks Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 11/28] ARM: dts: rockchip: fix a typo on rk3288 crypto-controller Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 12/28] mac80211: refuse aggregations sessions before authorized Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 13/28] MIPS: smp: fill in sibling and core maps earlier Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 14/28] ARM: 9178/1: fix unmet dependency on BITREVERSE for HAVE_ARCH_BITREVERSE Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 15/28] Bluetooth: hci_core: Fix leaking sent_cmd skb Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 16/28] can: rcar_canfd: rcar_canfd_channel_probe(): register the CAN device when fully ready Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 17/28] atm: firestream: check the return value of ioremap() in fs_init() Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 18/28] netfilter: egress: silence egress hook lockdep splats Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 19/28] Input: goodix - use the new soc_intel_is_byt() helper Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 20/28] Input: goodix - workaround Cherry Trail devices with a bogus ACPI Interrupt() resource Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 21/28] iwlwifi: dont advertise TWT support Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 22/28] drm/vrr: Set VRR capable prop only if it is attached to connector Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 23/28] nl80211: Update bss channel on channel switch for P2P_CLIENT Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 24/28] tcp: make tcp_read_sock() more robust Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 25/28] sfc: extend the locking on mcdi->seqno Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 26/28] bnx2: Fix an error message Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 27/28] kselftest/vm: fix tests build with old libc Greg Kroah-Hartman
2022-03-17 12:46 ` [PATCH 5.16 28/28] ice: Fix race condition during interface enslave Greg Kroah-Hartman
2022-03-17 17:01 ` [PATCH 5.16 00/28] 5.16.16-rc1 review Fox Chen
2022-03-17 22:17 ` Florian Fainelli
2022-03-18 2:20 ` Guenter Roeck
2022-03-18 9:10 ` Naresh Kamboju
2022-03-18 11:09 ` Bagas Sanjaya
2022-03-18 13:14 ` Jon Hunter
2022-03-18 13:48 ` Ron Economos
2022-03-18 13:52 ` Rudi Heitbaum
2022-03-18 22:56 ` Justin Forbes
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