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drm/amdgpu: Add module parameter for specifying default ABM level

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[Why]
It's non trivial to configure or specify an ABM reduction level for
userspace outside of X. There is also no method to specify the default
ABM value at boot time.

A parameter should be added to configure this.

[How]
Expose a module parameter that can specify the default ABM level to
use for eDP connectors on DC enabled hardware that loads the DMCU
firmware.

The default is still disabled (0), but levels can range from 1-4. Levels
control how much the backlight can be reduced, with being the least
amount of reduction and four being the most reduction.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: David Francis <david.francis@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas
2019-06-06 08:44:37 -04:00
committed by Alex Deucher
parent ae1589f669
commit ad4de27f48
2 changed files with 17 additions and 0 deletions
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16
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
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@@ -678,6 +678,22 @@ MODULE_PARM_DESC(hws_gws_support, "MEC FW support gws barriers (false = not supp
MODULE_PARM_DESC(dcfeaturemask, "all stable DC features enabled (default))");
module_param_named(dcfeaturemask, amdgpu_dc_feature_mask, uint, 0444);
/**
* DOC: abmlevel (uint)
* Override the default ABM (Adaptive Backlight Management) level used for DC
* enabled hardware. Requires DMCU to be supported and loaded.
* Valid levels are 0-4. A value of 0 indicates that ABM should be disabled by
* default. Values 1-4 control the maximum allowable brightness reduction via
* the ABM algorithm, with 1 being the least reduction and 4 being the most
* reduction.
*
* Defaults to 0, or disabled. Userspace can still override this level later
* after boot.
*/
uint amdgpu_dm_abm_level = 0;
MODULE_PARM_DESC(abmlevel, "ABM level (0 = off (default), 1-4 = backlight reduction level) ");
module_param_named(abmlevel, amdgpu_dm_abm_level, uint, 0444);
static const struct pci_device_id pciidlist[] = {
#ifdef CONFIG_DRM_AMDGPU_SI
{0x1002, 0x6780, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TAHITI},