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drm/amdgpu/si: fix crash on headless asics 

Missing check for crtcs present.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=193341
https://bugs.freedesktop.org/show_bug.cgi?id=99387

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2017-01-27 10:31:52 -05:00
parent 52b679f60e
commit 57bcd0a636
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
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@ -254,6 +254,9 @@ static void gmc_v6_0_mc_program(struct amdgpu_device *adev)
}
WREG32(mmHDP_REG_COHERENCY_FLUSH_CNTL, 0);
if (adev->mode_info.num_crtc)
amdgpu_display_set_vga_render_state(adev, false);
gmc_v6_0_mc_stop(adev, &save);
if (gmc_v6_0_wait_for_idle((void *)adev)) {
@ -283,7 +286,6 @@ static void gmc_v6_0_mc_program(struct amdgpu_device *adev)
dev_warn(adev->dev, "Wait for MC idle timedout !\n");
}
gmc_v6_0_mc_resume(adev, &save);
amdgpu_display_set_vga_render_state(adev, false);
}
static int gmc_v6_0_mc_init(struct amdgpu_device *adev)