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Subject[PATCH 5.4 154/191] net: stmmac: dwmac-meson8b: Fix the RGMII TX delay on Meson8b/8m2 SoCs
Date
From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

[ Upstream commit bd6f48546b9cb7a785344fc78058c420923d7ed8 ]

GXBB and newer SoCs use the fixed FCLK_DIV2 (1GHz) clock as input for
the m250_sel clock. Meson8b and Meson8m2 use MPLL2 instead, whose rate
can be adjusted at runtime.

So far we have been running MPLL2 with ~250MHz (and the internal
m250_div with value 1), which worked enough that we could transfer data
with an TX delay of 4ns. Unfortunately there is high packet loss with
an RGMII PHY when transferring data (receiving data works fine though).
Odroid-C1's u-boot is running with a TX delay of only 2ns as well as
the internal m250_div set to 2 - no lost (TX) packets can be observed
with that setting in u-boot.

Manual testing has shown that the TX packet loss goes away when using
the following settings in Linux (the vendor kernel uses the same
settings):
- MPLL2 clock set to ~500MHz
- m250_div set to 2
- TX delay set to 2ns on the MAC side

Update the m250_div divider settings to only accept dividers greater or
equal 2 to fix the TX delay generated by the MAC.

iperf3 results before the change:
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 182 MBytes 153 Mbits/sec 514 sender
[ 5] 0.00-10.00 sec 182 MBytes 152 Mbits/sec receiver

iperf3 results after the change (including an updated TX delay of 2ns):
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-10.00 sec 927 MBytes 778 Mbits/sec 0 sender
[ 5] 0.00-10.01 sec 927 MBytes 777 Mbits/sec receiver

Fixes: 4f6a71b84e1afd ("net: stmmac: dwmac-meson8b: fix internal RGMII clock configuration")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -112,6 +112,14 @@ static int meson8b_init_rgmii_tx_clk(str
struct device *dev = dwmac->dev;
const char *parent_name, *mux_parent_names[MUX_CLK_NUM_PARENTS];
struct meson8b_dwmac_clk_configs *clk_configs;
+ static const struct clk_div_table div_table[] = {
+ { .div = 2, .val = 2, },
+ { .div = 3, .val = 3, },
+ { .div = 4, .val = 4, },
+ { .div = 5, .val = 5, },
+ { .div = 6, .val = 6, },
+ { .div = 7, .val = 7, },
+ };

clk_configs = devm_kzalloc(dev, sizeof(*clk_configs), GFP_KERNEL);
if (!clk_configs)
@@ -146,9 +154,9 @@ static int meson8b_init_rgmii_tx_clk(str
clk_configs->m250_div.reg = dwmac->regs + PRG_ETH0;
clk_configs->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
clk_configs->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
- clk_configs->m250_div.flags = CLK_DIVIDER_ONE_BASED |
- CLK_DIVIDER_ALLOW_ZERO |
- CLK_DIVIDER_ROUND_CLOSEST;
+ clk_configs->m250_div.table = div_table;
+ clk_configs->m250_div.flags = CLK_DIVIDER_ALLOW_ZERO |
+ CLK_DIVIDER_ROUND_CLOSEST;
clk = meson8b_dwmac_register_clk(dwmac, "m250_div", &parent_name, 1,
&clk_divider_ops,
&clk_configs->m250_div.hw);

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