[Bug 49981] On HD6850, Power Profile doesn't change if 2 screen is attached.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49981

--- Comment #33 from Benjamin Lee <ben at b1c1l1.com> ---
Sorry, my previous patch was bogus -- TURKS mobility actually needs
POWER_STATE_TYPE_PERFORMANCE.  radeon_pm_get_type_index() currently fails to
find the requested state (POWER_STATE_TYPE_BATTERY).

Here is a trivial patch against linux-3.8.8:

diff -ruN linux-3.8.8.orig/drivers/gpu/drm/radeon/evergreen.c
linux-3.8.8/drivers/gpu/drm/radeon/evergreen.c
--- linux-3.8.8.orig/drivers/gpu/drm/radeon/evergreen.c 2013-04-16
22:11:28.000000000 -0700
+++ linux-3.8.8/drivers/gpu/drm/radeon/evergreen.c      2013-04-17
16:51:04.858752564 -0700
@@ -343,7 +343,7 @@
         * MH and SH.  Difference is that we always use the high clock index
for
         * mclk.
         */
-       if (rdev->flags & RADEON_IS_MOBILITY)
+       if ((rdev->flags & RADEON_IS_MOBILITY) && (rdev->family != CHIP_TURKS))
                idx = radeon_pm_get_type_index(rdev, POWER_STATE_TYPE_BATTERY,
0);
        else
                idx = radeon_pm_get_type_index(rdev,
POWER_STATE_TYPE_PERFORMANCE, 0);

Running with the patch in multi-head shows reduced engine clock and voltage,
but high memory clock as expected:

blee at supra ~ $ cat /sys/class/drm/card0/device/power_method
profile
blee at supra ~ $ cat /sys/class/drm/card0/device/power_profile
low
blee at supra ~ $ sudo cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 600000 kHz
current engine clock: 99990 kHz
default memory clock: 793750 kHz
current memory clock: 793750 kHz
voltage: 900 mV

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