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: 9368931 v2: clean up the code a bit bug: https://bugs.freedesktop.org/show_bug.cgi?id=91896 Signed-off-by: Alex Deucher <[email protected]>
pmladek · Oct 15, 2015 · 80c083c · 80c083c
1 parent 7b98040
commit 80c083c
Showing 1 changed file with 6 additions and 2 deletions.
diff --git 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;