mirror of
https://github.com/corundum/corundum.git
synced 2025-01-16 08:12:53 +08:00
79 lines
1.4 KiB
Bash
Executable File
79 lines
1.4 KiB
Bash
Executable File
#!/bin/bash
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dev=$1
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speed=$2
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if [ -z "$dev" ]; then
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echo "Error: no device specified"
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exit 1
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fi
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if [ ! -e "/sys/bus/pci/devices/$dev" ]; then
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dev="0000:$dev"
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fi
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if [ ! -e "/sys/bus/pci/devices/$dev" ]; then
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echo "Error: device $dev not found"
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exit 1
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fi
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pciec=$(setpci -s $dev CAP_EXP+02.W)
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pt=$(((0x$pciec & 0xF0) >> 4))
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port=$(basename $(dirname $(readlink "/sys/bus/pci/devices/$dev")))
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if (($pt == 0)) || (($pt == 1)) || (($pt == 5)); then
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dev=$port
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fi
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lc=$(setpci -s $dev CAP_EXP+0c.L)
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ls=$(setpci -s $dev CAP_EXP+12.W)
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max_speed=$((0x$lc & 0xF))
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echo "Link capabilities:" $lc
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echo "Max link speed:" $max_speed
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echo "Link status:" $ls
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echo "Current link speed:" $((0x$ls & 0xF))
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if [ -z "$speed" ]; then
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speed=$max_speed
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fi
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if (($speed > $max_speed)); then
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speed=$max_speed
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fi
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echo "Configuring $dev..."
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lc2=$(setpci -s $dev CAP_EXP+30.L)
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echo "Original link control 2:" $lc2
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echo "Original link target speed:" $((0x$lc2 & 0xF))
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lc2n=$(printf "%08x" $(((0x$lc2 & 0xFFFFFFF0) | $speed)))
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echo "New target link speed:" $speed
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echo "New link control 2:" $lc2n
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setpci -s $dev CAP_EXP+30.L=$lc2n
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echo "Triggering link retraining..."
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lc=$(setpci -s $dev CAP_EXP+10.L)
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echo "Original link control:" $lc
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lcn=$(printf "%08x" $((0x$lc | 0x20)))
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echo "New link control:" $lcn
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setpci -s $dev CAP_EXP+10.L=$lcn
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sleep 0.1
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ls=$(setpci -s $dev CAP_EXP+12.W)
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echo "Link status:" $ls
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echo "Current link speed:" $((0x$ls & 0xF))
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