[Intel-gfx] [PATCH 2/3] drm/i915: Do not touch PCH handshake registers if PCH is not present

[José Roberto de Souza]

If no PCH was detected in intel_detect_pch() don't touch the
handshake registers.

Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/intel_runtime_pm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 1c2de9b69a19..f33f335d6106 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -3325,6 +3325,9 @@ static void intel_pch_reset_handshake(struct drm_i915_private *dev_priv,
 	i915_reg_t reg;
 	u32 reset_bits, val;
 
+	if (!HAS_PCH_SPLIT(dev_priv))
+		return;
+
 	if (IS_IVYBRIDGE(dev_priv)) {
 		reg = GEN7_MSG_CTL;
 		reset_bits = WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK;
-- 
2.19.1