Attachment 118844 Details for Bug 91896 – possible fix

[patch] possible fix

0001-drm-amdgpu-adjust-default-dispclk-v2.patch (text/plain), 1.55 KB, created by Alex Deucher on 2015-10-12 19:49:04 UTC

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Creator: Alex Deucher

Created: 2015-10-12 19:49:04 UTC

Size: 1.55 KB

patch

obsolete

>From 6651033fc2224036ebeb6fe0d40c4fa7ed2f7b63 Mon Sep 17 00:00:00 2001
>From: Alex Deucher <alexander.deucher@amd.com>
>Date: Mon, 12 Oct 2015 10:38:02 -0400
>Subject: [PATCH] drm/amdgpu: adjust default dispclk (v2)
>
>Set the default to 600Mhz if it's not set in the bios,
>and bump the default to 600Mhz if it's lower than that.
>
>Port of radeon commit:
>9368931db826d57b6b88b3145a00276626b48df0
>
>v2: clean up the code a bit
>
>bug:
>https://bugs.freedesktop.org/show_bug.cgi?id=91896
>
>Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
>---
> drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
>index 77f1d7c..9416e0f 100644
>--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
>+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
>@@ -672,8 +672,12 @@ int amdgpu_atombios_get_clock_info(struct amdgpu_device *adev)
> 		/* disp clock */
> 		adev->clock.default_dispclk =
> 			le32_to_cpu(firmware_info->info_21.ulDefaultDispEngineClkFreq);
>-		if (adev->clock.default_dispclk == 0)
>-			adev->clock.default_dispclk = 54000; /* 540 Mhz */
>+		/* set a reasonable default for DP */
>+		if (adev->clock.default_dispclk < 53900) {
>+			DRM_INFO("Changing default dispclk from %dMhz to 600Mhz\n",
>+				 adev->clock.default_dispclk / 100);
>+			adev->clock.default_dispclk = 60000;
>+		}
> 		adev->clock.dp_extclk =
> 			le16_to_cpu(firmware_info->info_21.usUniphyDPModeExtClkFreq);
> 		adev->clock.current_dispclk = adev->clock.default_dispclk;
>-- 
>1.8.3.1
>

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