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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