#!/sbin/runscript
# read this article to know what to do
# http://gentoo.org/doc/en/articles/hardware-stability-p2.xml#doc_chap3_pre2

# report bugs to: http://bugs.gentoo.org/show_bug.cgi?id=173347

depend() {
	before bootmisc hdparm
}

do_setpci_latency() {
	if [[ "$1" = "*:*" ]]; then
		GLOB="global "
		SWITCH="-d"
	else
		SPEC="for card $1 "
		SWITCH="-s"
	fi
	ebegin "Setting ${GLOB}latency timer ${SPEC}to $2"
	setpci $SETPCI_OPT $SWITCH $1 latency_timer=$2
	eend $?
	GLOB=""
	SPEC=""
	SWITCH=""
}

start() {
	if get_bootparam "nopciparm" ; then
		ewarn "Skipping pciparm init as requested in kernel cmdline"
		return 0
	fi

	SETPCI_OPT=""
	if [[ "$VERBOSE" = "yes" ]]; then
		SETPCI_OPT="$SETPCI_OPT -v"
	fi

	if [[ -n "$LATENCY_TIMER_ALL" ]]; then
		do_setpci_latency *:* $LATENCY_TIMER_ALL
	fi

	if [[ -n "$TWEAK_CARDS" ]] ; then
		for pci_id in $TWEAK_CARDS; do
			FLAT_ID="${pci_id//[:.]/_}"
			LATENCY_PARAM="LATENCY_TIMER_${FLAT_ID}"
			if [[ -n "${!LATENCY_PARAM}" ]]; then
				do_setpci_latency ${pci_id} ${!LATENCY_PARAM}
			fi
		done
	fi
}