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realtek: rtl930x: Fix bringup of SFP modules

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The commit d2108c2c58 ("realtek: enhance RTL930x SerDes/PLL/CMU
interoperability") removed a couple of commands for the bringup code.
One of these commands was necessary to bring up SFP modules correctly. This
one can also be found in the RTLSDK [1].

It is currently not 100% clear what this command does. But if it works
similar to the RTL8295 [2,3] (RTL8295_SDS0_ANA_MISC_REG00_REG), we could
assume that it could be the RX_ON and RX_EN bits.

[1] 0e2e45341a/loader/u-boot-2011.12/board/Realtek/switch/sdk/src/dal/longan/dal_longan_sds.c (L1104)
[2] https://svanheule.net/realtek/mango/register/serdes_indrt_access_ctrl
[3] 54589ff0af/sources/rtk-dms1250/include/hal/phy/rtl8295_reg_def.h (L7726)

Reported-by: Jan Fuchs <jf@simonwunderlich.de>
Fixes: d2108c2c58 ("realtek: enhance RTL930x SerDes/PLL/CMU interoperability")
Signed-off-by: Harshal Gohel <hg@simonwunderlich.de>
Co-developed-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Signed-off-by: Sharadanand Karanjkar <sk@simonwunderlich.de>
Link: https://github.com/openwrt/openwrt/pull/19582
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Harshal Gohel
2025-07-25 13:50:36 +02:00
committed by Robert Marko
parent 1de1df1bea
commit 656312f9b7
1 changed files with 4 additions and 2 deletions
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6
target/linux/realtek/files-6.12/drivers/net/phy/rtl83xx-phy.c
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@@ -1711,9 +1711,11 @@ static int rtsds_930x_get_internal_mode(int sds)
static void rtsds_930x_set_power(int sds, bool on)
{
int power = on ? 0 : 3;
int power_down = on ? 0x0 : 0x3;
int rx_enable = on ? 0x3 : 0x1;
rtl9300_sds_field_w(sds, 0x20, 0x00, 7, 6, power);
rtl9300_sds_field_w(sds, 0x20, 0x00, 7, 6, power_down);
rtl9300_sds_field_w(sds, 0x20, 0x00, 5, 4, rx_enable);
}
static int rtsds_930x_config_pll(int sds, phy_interface_t interface)