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authorAlex Deucher <alexander.deucher@amd.com>2015-10-12 10:38:02 -0400
committerAlex Deucher <alexander.deucher@amd.com>2015-10-15 10:04:13 -0400
commit80c083c5e4dc35fa37c01f000b1393c51294b9de (patch)
tree14d6f5f69af7ecceb4cfa0842fd0820f7289ee9b
parent7b98040a7718663903bb25c06c7aed9801abbd9d (diff)
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>
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c8
1 files 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 77f1d7c6ea3a..9416e0f5c1db 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;