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drm/amdgpu/cgs: add refresh rate checking to non-DC display code

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Clamp the vblank period to 0 if the refresh rate is larger than
120 hz for non-DC.  This allows us to remove the refresh rate
checks from powerplay for mclk switching.

Reviewed-by: Eric Huang <JinhuiEric.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2018-02-13 14:33:51 -05:00
parent a9b3c00165
commit 7a572b1eda
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
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@ -953,6 +953,11 @@ static int amdgpu_cgs_get_active_displays_info(struct cgs_device *cgs_device,
(amdgpu_crtc->v_border * 2);
mode_info->vblank_time_us = vblank_lines * line_time_us;
mode_info->refresh_rate = drm_mode_vrefresh(&amdgpu_crtc->hw_mode);
/* we have issues with mclk switching with refresh rates
* over 120 hz on the non-DC code.
*/
if (mode_info->refresh_rate > 120)
mode_info->vblank_time_us = 0;
mode_info = NULL;
}
}