Attachment 131319 Details for Bug 96868 – possible fix 1/4

[patch] possible fix 1/4

0001-drm-amdgpu-ci-disable-mclk-switching-for-high-refres.patch (text/plain), 1.16 KB, created by Alex Deucher on 2017-05-11 17:59:47 UTC

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Creator: Alex Deucher

Created: 2017-05-11 17:59:47 UTC

Size: 1.16 KB

patch

obsolete

>From fd8634218a82a43791a17c560e88631b1668909e Mon Sep 17 00:00:00 2001
>From: Alex Deucher <alexander.deucher@amd.com>
>Date: Thu, 11 May 2017 13:10:02 -0400
>Subject: [PATCH 1/4] drm/amdgpu/ci: disable mclk switching for high refresh
> rates
>
>Even if the vblank period would allow it, it still seems to
>be problematic on some cards.
>
>bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868
>
>Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
>---
> drivers/gpu/drm/amd/amdgpu/ci_dpm.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
>diff --git a/drivers/gpu/drm/amd/amdgpu/ci_dpm.c b/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
>index 6dc1410..eb5d03b 100644
>--- a/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
>+++ b/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
>@@ -906,6 +906,12 @@ static bool ci_dpm_vblank_too_short(struct amdgpu_device *adev)
> 	u32 vblank_time = amdgpu_dpm_get_vblank_time(adev);
> 	u32 switch_limit = adev->mc.vram_type == AMDGPU_VRAM_TYPE_GDDR5 ? 450 : 300;
> 
>+	/* disable mclk switching if the refresh is >120Hz, even if the
>+	 * blanking period would allow it
>+	 */
>+	if (amdgpu_dpm_get_vrefresh(adev) > 120)
>+		return false;
>+
> 	if (vblank_time < switch_limit)
> 		return true;
> 	else
>-- 
>2.5.5
>

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Attachments on bug 96868: 125006 | 125007 | 125011 | 131319 | 131320 | 131321 | 131322 | 131450 | 131451 | 131452 | 131453 | 142660

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