On Fri, Mar 2, 2018 at 5:44 AM, Jerome Brunet jbrunet@baylibre.com wrote:

Different modules maybe installed by the user on the eMMC connector of the odroid-c2. While the red modules are working without an issue, it seems some black modules (apparently Samsung based) are having issue at 200MHz

While the tuning algorithm introduced in v4.14 enables high speed modes on every other tested designs, it seems a problem remains for this particular combination of board and eMMC module.

Lowering the maximum frequency of the eMMC on this board until we can figure out a better solution.

Fixes: d341ca88eead ("mmc: meson-gx: rework tuning function") Suggested-by: Ellie Reeves ellierevves@gmail.com Signed-off-by: Jerome Brunet jbrunet@baylibre.com

Now in mainline as commit c04ffa71ff49 upstream.

The mainline patch has "Cc: stable@vger.kernel.org", but it doesn't seem to have appeared in stable yet, and I've verified that it applies cleanly to linux-4.15.y and linux-4.14.y.

Kevin

---

arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts index 73a030a5ecf3..43475139576c 100644 --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts @@ -311,7 +311,7 @@ pinctrl-names = "default", "clk-gate";

    bus-width = <8>;

•   max-frequency = <200000000>;
  

•   max-frequency = <100000000>;
    non-removable;
    disable-wp;
    cap-mmc-highspeed;
  

-- 2.14.3