[Intel-gfx] [PATCH 02/10] drm/i915: Set PCH as NOP when display is disabled

[José Roberto de Souza]

num_pipes is set to 0 if disable_display is set inside
intel_device_info_runtime_init() but when that happen PCH will
already be set in intel_detect_pch().

i915_driver_load()
	i915_driver_init_early()
		...
		intel_detect_pch()
		...
	...
	i915_driver_init_hw()
		intel_device_info_runtime_init()

Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 18a45e7a3d7c..62f34f8aa02b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -287,7 +287,8 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 	 * Use PCH_NOP (PCH but no South Display) for PCH platforms without
 	 * display.
 	 */
-	if (pch && INTEL_INFO(dev_priv)->num_pipes == 0) {
+	if (pch && ((INTEL_INFO(dev_priv)->num_pipes == 0) ||
+		    i915_modparams.disable_display)) {
 		DRM_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
 		dev_priv->pch_type = PCH_NOP;
 		dev_priv->pch_id = 0;
-- 
2.18.0