linux-kernel - [PATCH 4.17 076/220] ARM64: dts: meson: disable sd-uhs modes on the libretech-cc

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Date:   Sun,  1 Jul 2018 18:21:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>
Subject: [PATCH 4.17 076/220] ARM64: dts: meson: disable sd-uhs modes on the libretech-cc

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jerome Brunet <jbrunet@...libre.com>

commit d5b4885b1dff72ac670b518cfeaac719d768bd4d upstream.

There is a problem with the sd-uhs mode when doing a soft reboot.
Switching back from 1.8v to 3.3v messes with the card, which no longer
respond (timeout errors). According to the specification, we should
perform a card reset (power cycling the card) but this is something we
cannot control on this design.

Then the only solution to restore the communication with the card is an
"unplug-plug" which is not acceptable

Until we find a solution, if any, disable the sd-uhs modes on this design.
For the people using uhs at the moment, there will a performance drop as
a result.

Fixes: 3cde63ebc85c ("ARM64: dts: meson-gxl: libretech-cc: enable high speed modes")
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
Cc: stable@...r.kernel.org
Signed-off-by: Kevin Hilman <khilman@...libre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/boot/dts/amlogic/meson-gxl-s905x-libretech-cc.dts |    3 ---
 1 file changed, 3 deletions(-)

--- a/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-libretech-cc.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-libretech-cc.dts
@@ -234,9 +234,6 @@
 
 	bus-width = <4>;
 	cap-sd-highspeed;
-	sd-uhs-sdr12;
-	sd-uhs-sdr25;
-	sd-uhs-sdr50;
 	max-frequency = <100000000>;
 	disable-wp;