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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
# Copyright (C) 2014 Michał Masłowski <mtjm@mtjm.eu>
#
# Licensed under copyleft-next version 0.3.0. See
# https://gitorious.org/copyleft-next/copyleft-next/raw/master:Releases/copyleft-next-0.3.0
# for more information.
"""Get values of interesting i945 graphics parameters from a running system.
This script might show the values for GPU registers specified in
devicetree.cb on coreboot mainboard ports using i945 native VGA init
from <http://review.coreboot.org/#/c/5320/>.
Run as root.
"""
import mmap
import re
import struct
import subprocess
_MEMORY = re.compile(r"^\s+Memory\s+at\s+([0-9a-f]+)\s+\(32-bit, non-prefetchable\)\s+\[size=[0-9]+K\]$")
def get_pci_data():
# lspci has a machine readable format, but it doesn't have the needed data.
for devid in "8086:27a2", "8086:27a6":
lspci = subprocess.Popen(("lspci", "-vn", "-d", devid),
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
for line in lspci.communicate()[0].split("\n"):
match = _MEMORY.match(line)
if match is not None:
yield int(match.group(1), 16)
break
func0, func1 = list(get_pci_data())
def read32(fo, base, offset):
memory = mmap.mmap(fo.fileno(), offset + 4,
mmap.MAP_SHARED, mmap.ACCESS_READ,
offset=base)
try:
memory.seek(offset)
val = memory.read(4)
return struct.unpack("=I", val)[0]
finally:
memory.close()
# Some i915 register names.
PORT_HOTPLUG_EN = 0x61110
BLC_PWM_CTL = 0x61254
LVDS = 0x61180
# Bits in LVDS.
LVDS_CLOCK_B_POWERUP_ALL = 3 << 4
LVDS_CLOCK_BOTH_POWERUP_ALL = 3 << 2
# Expansion of DPLL(1).
DPLL1 = ((0x06014) + (1)*((0x06018)-(0x06014)))
# Bits there.
DPLL_INTEGRATED_CLOCK_VLV = (1<<13)
DPLL_INTEGRATED_CRI_CLK_VLV = (1<<14)
if __name__ == "__main__":
with open("/dev/mem", "rb") as mem:
print "gpu_hotplug = 0x%08x" % read32(mem, func0, PORT_HOTPLUG_EN)
dpll = read32(mem, func0, DPLL1)
spread_spectrum = dpll & (DPLL_INTEGRATED_CLOCK_VLV \
| DPLL_INTEGRATED_CRI_CLK_VLV)
if spread_spectrum != 0:
spread_spectrum = 1
print "gpu_lvds_use_spread_spectrum_clock = %d" % spread_spectrum
lvds = read32(mem, func0, LVDS)
dual_channel = lvds & (LVDS_CLOCK_B_POWERUP_ALL \
| LVDS_CLOCK_BOTH_POWERUP_ALL)
if dual_channel != 0:
dual_channel = 1
print "gpu_lvds_is_dual_channel = %d" % dual_channel
backlight = read32(mem, func0, BLC_PWM_CTL)
print "gpu_backlight = 0x%08x" % backlight
# Using display clock from i945_get_display_clock_speed in
# drivers/gpu/drm/i915/intel_display.c. Result multiplied by
# two to match BIOS-reported PWM frequency on my X60t.
mod_freq = 2 * 400000000 / ((backlight >> 16) * 128.0)
print "backlight modulation frequency = %f Hz" % mod_freq
print "duty cycle = %d%%" % (100.0 * (backlight & 0xffff)
/ (backlight >> 16))
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