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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:
9368931db8

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>
This commit is contained in:
Alex Deucher 2015-10-12 10:38:02 -04:00
parent 7b98040a77
commit 80c083c5e4
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
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@ -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;