Bryan Boatright wrote:
I hope this is an appropriate place to ask this question. Googling for answers turned up nothing. I am using kernel 2.6.19.1 and am trying to get NCQ support working. My Intel chipset (ESB2, see details below) should support NCQ, but it is not returning the NCQ capabilities bit in the HBA Capabilities register. Here's the relevant dmesg output:
Please test the latest Linus git-tree. ahci used to clear CAP while resetting controller expecting it to set supported feature bits again. Apparently some controllers don't do it resulting in disabled NCQ. This was fixed recently by the following commit. Commit: 551c012d7eea3dc5ec063c7ff9c718d39e77634f Author: Tejun Heo <htejun@xxxxxxxxx> 2006-12-12 20:17:32 Committer: Jeff Garzik <jeff@xxxxxxxxxx> 2006-12-17 00:13:29 Branches: upstream-fixes, upstream, quilt-init Follows: v2.6.19 Precedes: [PATCH] ahci: do not mangle saved HOST_CAP while resetting controller Do not mangle with HOST_CAP while resetting controller. The code is there for a historical reason. The mangling breaks controller feature detection and 0 PORTS_IMPL workaround code. This problem was spotted by Manoj Kasichainula. Signed-off-by: Tejun Heo <htejun@xxxxxxxxx> Cc: Manoj Kasichainula <manoj@xxxxxx> Signed-off-by: Jeff Garzik <jeff@xxxxxxxxxx> Happy new year. -- tejun - 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
