Attachment 132358 Details for Bug 101528 – possible fix

[patch] possible fix

0001-drm-amdgpu-fix-vblank_time-when-displays-are-off.patch (text/plain), 1.26 KB, created by Alex Deucher on 2017-06-29 20:14:55 UTC

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Creator: Alex Deucher

Created: 2017-06-29 20:14:55 UTC

Size: 1.26 KB

patch

obsolete

>From 23dd6a301bd9559e451b092e760b0740dc7053d1 Mon Sep 17 00:00:00 2001
>From: Alex Deucher <alexander.deucher@amd.com>
>Date: Thu, 29 Jun 2017 16:08:49 -0400
>Subject: [PATCH] drm/amdgpu: fix vblank_time when displays are off
>
>If the displays are off, set the vblank time to max to make
>sure mclk switching is enabled.  Avoid mclk getting set
>to high when no displays are attached.
>
>bug: https://bugs.freedesktop.org/show_bug.cgi?id=101528
>fixes: 09be4a5219 (drm/amd/powerplay/smu7: add vblank check for mclk switching (v2))
>Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
>Cc: stable@vger.kernel.org
>---
> drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c | 3 +++
> 1 file changed, 3 insertions(+)
>
>diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
>index c6dba1e..8b8eda7 100644
>--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
>+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
>@@ -838,6 +838,9 @@ static int amdgpu_cgs_get_active_displays_info(struct cgs_device *cgs_device,
> 		return -EINVAL;
> 
> 	mode_info = info->mode_info;
>+	if (mode_info)
>+		/* if the displays are off, vblank time is max */
>+		mode_info->vblank_time_us = 0xffffffff;
> 
> 	if (adev->mode_info.num_crtc && adev->mode_info.mode_config_initialized) {
> 		list_for_each_entry(crtc,
>-- 
>2.5.5
>

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