I've got an eSATA disk enclosure behind a SATA PMP, which uses a SiI3826 chip. This particular enclosure exposes control of some LEDs and fan speed via the SiI3826 GPIO GSCR [130]. I tried bringing out a sysfs file to read/write GSCRs at runtime using sata_pmp_write(). This generally works well when the enclosure is idle. But if I put the PMP under load (say, creating a MD RAID array across all the disks and start a resync), every time I read or write a GSCR, I get an "illegal qc_active transition" message and the PMP resets. This occurs at or near 100% of the time. So then I cobbled together a new function similar to sata_pmp_write(), but based on the old ahci_pmp_write() function that did polling using ahci_exec_polled_cmd(). Using this method reduced the odds of causing a PMP reset from ~100% to ~3%. But occasionally I still do see resets. Does anyone have any ideas on what's going on here, or how to resolve this? Thanks, -Justin -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
