drm/amdgpu: adjust default dispclk (v2)
authorAlex Deucher <alexander.deucher@amd.com>
Mon, 12 Oct 2015 14:38:02 +0000 (10:38 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 15 Oct 2015 14:04:13 +0000 (10:04 -0400)
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

index 77f1d7c6ea3af627324b147e63b21b6cbdd16302..9416e0f5c1db2bf8c5601ddee999b1ade5efabc0 100644 (file)
@@ -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;