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drm/radeon: add bapm module parameter

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Add a module paramter to enable bapm on APUs.  It's disabled
by default on certain APUs due to stability issues.  This
option makes it easier to test and to enable it on systems that
are stable.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=81021

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher
2014-08-07 09:28:31 -04:00
parent 251964845f
commit 6e909f74db
4 changed files with 24 additions and 10 deletions
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24
drivers/gpu/drm/radeon/trinity_dpm.c
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@@ -1874,16 +1874,22 @@ int trinity_dpm_init(struct radeon_device *rdev)
for (i = 0; i < SUMO_MAX_HARDWARE_POWERLEVELS; i++)
pi->at[i] = TRINITY_AT_DFLT;
/* There are stability issues reported on with
* bapm enabled when switching between AC and battery
* power. At the same time, some MSI boards hang
* if it's not enabled and dpm is enabled. Just enable
* it for MSI boards right now.
*/
if (rdev->pdev->subsystem_vendor == 0x1462)
pi->enable_bapm = true;
else
if (radeon_bapm == -1) {
/* There are stability issues reported on with
* bapm enabled when switching between AC and battery
* power. At the same time, some MSI boards hang
* if it's not enabled and dpm is enabled. Just enable
* it for MSI boards right now.
*/
if (rdev->pdev->subsystem_vendor == 0x1462)
pi->enable_bapm = true;
else
pi->enable_bapm = false;
} else if (radeon_bapm == 0) {
pi->enable_bapm = false;
} else {
pi->enable_bapm = true;
}
pi->enable_nbps_policy = true;
pi->enable_sclk_ds = true;
pi->enable_gfx_power_gating = true;