[Intel-gfx] [DMC-REDESIGN-PATCHES 09/12] drm/i915/gen9: Don't try to load garbage dmc firmware on resume

[Animesh Manna]

From: Daniel Vetter <daniel.vetter at intel.com>

We need to make sure we don't put garbage into the hw if dmc firmware
loading failed mid-thru.

Cc: Damien Lespiau <damien.lespiau at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Sunil Kamath <sunil.kamath at intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
 drivers/gpu/drm/i915/intel_csr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index bf98871..87596a2 100644
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -202,6 +202,9 @@ void intel_csr_load_program(struct drm_device *dev)
 		return;
 	}
 
+	if (!dev_priv->csr.dmc_payload)
+		return;
+
 	fw_size = dev_priv->csr.dmc_fw_size;
 	for (i = 0; i < fw_size; i++)
 		I915_WRITE(CSR_PROGRAM_BASE + i * 4,
-- 
2.0.2