USXGMII submode (10GSX vs 10GQX) is selected through a dedicated
register at 0x13e8, independent of the MAC and IP mode registers.
Without programming it, USXGMII-QX ports initialise as single-lane
SX and fail to link up correctly; MAC and IP mode alone are
insufficient for a working USXGMII setup.
The register packs 12 x 5-bit entries for SerDes 2..13, six per
32-bit word, non-straddling (bits 0..29 used, 30..31 padded). This
matches the available register dumps and the SDK's
reg_array_field_write() non-CROSS_REGISTERS path, which derives the
bit position as ((index - larray) % (32 / width)) * width and
accesses only a single 32-bit word. The submode values are identical
to RTL930x, so the shared RTPCS_93XX_SDS_USXGMII_SUBMODE_* defines
are reused.
Allocate the regmap_field at probe time with coordinates computed
from the SerDes ID; the regular packing needs no lookup table. Call
rtpcs_93xx_sds_apply_usxgmii_submode() from the set_mode dispatcher
after set_ip_mode - the helper's null-guard and mode filter leave
non-USXGMII paths unchanged.
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23120
Signed-off-by: Robert Marko <robimarko@gmail.com>
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