This is a note to let you know that I've just added the patch titled arm64: dts: rockchip: fix rk3328 rgmii high tx error rate to the 5.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-dts-rockchip-fix-rk3328-rgmii-high-tx-error-rate.patch and it can be found in the queue-5.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 6fd8b9780ec1a49ac46e0aaf8775247205e66231 Mon Sep 17 00:00:00 2001 From: Peter Geis <pgwipeout@xxxxxxxxx> Date: Wed, 13 Mar 2019 18:45:36 +0000 Subject: arm64: dts: rockchip: fix rk3328 rgmii high tx error rate From: Peter Geis <pgwipeout@xxxxxxxxx> commit 6fd8b9780ec1a49ac46e0aaf8775247205e66231 upstream. Several rk3328 based boards experience high rgmii tx error rates. This is due to several pins in the rk3328.dtsi rgmii pinmux that are missing a defined pull strength setting. This causes the pinmux driver to default to 2ma (bit mask 00). These pins are only defined in the rk3328.dtsi, and are not listed in the rk3328 specification. The TRM only lists them as "Reserved" (RK3328 TRM V1.1, 3.3.3 Detail Register Description, GRF_GPIO0B_IOMUX, GRF_GPIO0C_IOMUX, GRF_GPIO0D_IOMUX). However, removal of these pins from the rgmii pinmux definition causes the interface to fail to transmit. Also, the rgmii tx and rx pins defined in the dtsi are not consistent with the rk3328 specification, with tx pins currently set to 12ma and rx pins set to 2ma. Fix this by setting tx pins to 8ma and the rx pins to 4ma, consistent with the specification. Defining the drive strength for the undefined pins eliminated the high tx packet error rate observed under heavy data transfers. Aligning the drive strength to the TRM values eliminated the occasional packet retry errors under iperf3 testing. This allows much higher data rates with no recorded tx errors. Tested on the rk3328-roc-cc board. Fixes: 52e02d377a72 ("arm64: dts: rockchip: add core dtsi file for RK3328 SoCs") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Peter Geis <pgwipeout@xxxxxxxxx> Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm64/boot/dts/rockchip/rk3328.dtsi | 44 +++++++++++++++---------------- 1 file changed, 22 insertions(+), 22 deletions(-) --- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi @@ -1628,50 +1628,50 @@ rgmiim1_pins: rgmiim1-pins { rockchip,pins = /* mac_txclk */ - <1 RK_PB4 2 &pcfg_pull_none_12ma>, + <1 RK_PB4 2 &pcfg_pull_none_8ma>, /* mac_rxclk */ - <1 RK_PB5 2 &pcfg_pull_none_2ma>, + <1 RK_PB5 2 &pcfg_pull_none_4ma>, /* mac_mdio */ - <1 RK_PC3 2 &pcfg_pull_none_2ma>, + <1 RK_PC3 2 &pcfg_pull_none_4ma>, /* mac_txen */ - <1 RK_PD1 2 &pcfg_pull_none_12ma>, + <1 RK_PD1 2 &pcfg_pull_none_8ma>, /* mac_clk */ - <1 RK_PC5 2 &pcfg_pull_none_2ma>, + <1 RK_PC5 2 &pcfg_pull_none_4ma>, /* mac_rxdv */ - <1 RK_PC6 2 &pcfg_pull_none_2ma>, + <1 RK_PC6 2 &pcfg_pull_none_4ma>, /* mac_mdc */ - <1 RK_PC7 2 &pcfg_pull_none_2ma>, + <1 RK_PC7 2 &pcfg_pull_none_4ma>, /* mac_rxd1 */ - <1 RK_PB2 2 &pcfg_pull_none_2ma>, + <1 RK_PB2 2 &pcfg_pull_none_4ma>, /* mac_rxd0 */ - <1 RK_PB3 2 &pcfg_pull_none_2ma>, + <1 RK_PB3 2 &pcfg_pull_none_4ma>, /* mac_txd1 */ - <1 RK_PB0 2 &pcfg_pull_none_12ma>, + <1 RK_PB0 2 &pcfg_pull_none_8ma>, /* mac_txd0 */ - <1 RK_PB1 2 &pcfg_pull_none_12ma>, + <1 RK_PB1 2 &pcfg_pull_none_8ma>, /* mac_rxd3 */ - <1 RK_PB6 2 &pcfg_pull_none_2ma>, + <1 RK_PB6 2 &pcfg_pull_none_4ma>, /* mac_rxd2 */ - <1 RK_PB7 2 &pcfg_pull_none_2ma>, + <1 RK_PB7 2 &pcfg_pull_none_4ma>, /* mac_txd3 */ - <1 RK_PC0 2 &pcfg_pull_none_12ma>, + <1 RK_PC0 2 &pcfg_pull_none_8ma>, /* mac_txd2 */ - <1 RK_PC1 2 &pcfg_pull_none_12ma>, + <1 RK_PC1 2 &pcfg_pull_none_8ma>, /* mac_txclk */ - <0 RK_PB0 1 &pcfg_pull_none>, + <0 RK_PB0 1 &pcfg_pull_none_8ma>, /* mac_txen */ - <0 RK_PB4 1 &pcfg_pull_none>, + <0 RK_PB4 1 &pcfg_pull_none_8ma>, /* mac_clk */ - <0 RK_PD0 1 &pcfg_pull_none>, + <0 RK_PD0 1 &pcfg_pull_none_4ma>, /* mac_txd1 */ - <0 RK_PC0 1 &pcfg_pull_none>, + <0 RK_PC0 1 &pcfg_pull_none_8ma>, /* mac_txd0 */ - <0 RK_PC1 1 &pcfg_pull_none>, + <0 RK_PC1 1 &pcfg_pull_none_8ma>, /* mac_txd3 */ - <0 RK_PC7 1 &pcfg_pull_none>, + <0 RK_PC7 1 &pcfg_pull_none_8ma>, /* mac_txd2 */ - <0 RK_PC6 1 &pcfg_pull_none>; + <0 RK_PC6 1 &pcfg_pull_none_8ma>; }; rmiim1_pins: rmiim1-pins { Patches currently in stable-queue which might be from pgwipeout@xxxxxxxxx are queue-5.0/arm64-dts-rockchip-fix-rk3328-rgmii-high-tx-error-rate.patch queue-5.0/arm64-dts-rockchip-fix-rk3328-sdmmc0-write-errors.patch