[Intel-gfx] [PATCH v3 07/13] drm/i915/gen9: Don't try to load garbage dmc firmware on resume

Imre Deak imre.deak at intel.com
Wed Oct 28 14:59:01 PDT 2015

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>
Reviewed-by: Imre Deak <imre.deak at intel.com>
 drivers/gpu/drm/i915/intel_csr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index 1f02fe0..bbf6b8d 100644
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -227,7 +227,7 @@ void intel_csr_load_program(struct drm_device *dev)
 	 * Unfortunately the ACPI subsystem doesn't yet give us a way to
 	 * differentiate this, hence figure it out with this hack.
-	if (I915_READ(CSR_PROGRAM(0)))
+	if ((!dev_priv->csr.dmc_payload) || I915_READ(CSR_PROGRAM(0)))
 	fw_size = dev_priv->csr.dmc_fw_size;

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