How to reset a sata pcmcia controller port to UDMA/100 ?

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I have a esata (external) disk drive, which I keep permanently connected
to a sata pcmcia port (using a esata-sata cable). The pcmcia
controller's chipset as reported by lspci is:

02:00.0 Mass storage controller: Silicon Image, Inc. SiI 3112
[SATALink/SATARaid] Serial ATA Controller (rev 02)

and I have built a custom kernel:

laptop ~ # grep -i sil /usr/src/linux/.config
CONFIG_SATA_SIL=y
# CONFIG_SATA_SIL24 is not set
CONFIG_PATA_SIL680=m
# CONFIG_FB_ASILIANT is not set
laptop ~ #

Modules loaded are:
laptop ~ # lsmod
Module                  Size  Used by
af_packet              11272  2
snd_pcm_oss            33952  0
snd_mixer_oss          12640  1 snd_pcm_oss
snd_seq_oss            24768  0
snd_seq_midi_event      5184  1 snd_seq_oss
snd_seq                37424  4 snd_seq_oss,snd_seq_midi_event
snd_seq_device          5804  2 snd_seq_oss,snd_seq
tun                     7296  0
backlight               4032  0
lcd                     3680  0
nfsd                   75240  13
exportfs                3840  1 nfsd
lockd                  52904  2 nfsd
sunrpc                131100  8 nfsd,lockd
usbhid                 14196  0
snd_maestro3           18852  1
snd_ac97_codec         88420  1 snd_maestro3
ac97_bus                1792  1 snd_ac97_codec
snd_pcm                57288  3 snd_pcm_oss,snd_maestro3,snd_ac97_codec
snd_timer              15332  2 snd_seq,snd_pcm
snd_page_alloc          7080  1 snd_pcm
parport_pc             20036  0
parport                18304  1 parport_pc
floppy                 46404  0
i2c_piix4               6860  0
i2c_core               17808  1 i2c_piix4
uhci_hcd               18412  0
usbcore                98872  3 usbhid,uhci_hcd
rtc                     8504  0
intel_agp              19764  1
agpgart                24112  1 intel_agp
unix                   18416  813
laptop ~ #

The problem:
The plug on the pcmcia card seems very sensitive, cause if I try to
touch / slightly move the plug, dmesg gives:

ata4: exception Emask 0x10 SAct 0x0 SErr 0x90000 action 0x2 frozen
ata4: hard resetting port
ata4: port is slow to respond, please be patient (Status 0xff)
ata4: COMRESET failed (errno=-16)
ata4: hard resetting port
ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
ata4.00: configured for UDMA/66
ata4: EH pending after completion, repeating EH (cnt=4)
ata4: EH complete
sd 3:0:0:0: [sdb] 586072368 512-byte hardware sectors (300069 MB)
sd 3:0:0:0: [sdb] Write Protect is off
sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't
support DPO or FUA

Question: Is there a command to reset the port to UDMA/100 ?
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