[PATCH 02/15] drm/i915: Properly 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()

So now setting num_pipes = 0 earlier to avoid this problem.

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          | 5 +++++
 drivers/gpu/drm/i915/intel_device_info.c | 8 ++------
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 5e2d91f4dd2d..41ef2effc1be 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1659,6 +1659,11 @@ i915_driver_create(struct pci_dev *pdev, const struct pci_device_id *ent)
 	memcpy(device_info, match_info, sizeof(*device_info));
 	device_info->device_id = pdev->device;
 
+	if (i915_modparams.disable_display) {
+		DRM_INFO("Display disabled (module parameter)\n");
+		device_info->num_pipes = 0;
+	}
+
 	BUILD_BUG_ON(INTEL_MAX_PLATFORMS >
 		     BITS_PER_TYPE(device_info->platform_mask));
 	BUG_ON(device_info->gen > BITS_PER_TYPE(device_info->gen_mask));
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index 9d1586172f90..239d020aea2f 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -779,12 +779,8 @@ void intel_device_info_runtime_init(struct intel_device_info *info)
 			info->num_sprites[pipe] = 1;
 	}
 
-	if (i915_modparams.disable_display) {
-		DRM_INFO("Display disabled (module parameter)\n");
-		info->num_pipes = 0;
-	} else if (HAS_DISPLAY(dev_priv) &&
-		   (IS_GEN7(dev_priv) || IS_GEN8(dev_priv)) &&
-		   HAS_PCH_SPLIT(dev_priv)) {
+	if (HAS_DISPLAY(dev_priv) && (IS_GEN7(dev_priv) || IS_GEN8(dev_priv)) &&
+	    HAS_PCH_SPLIT(dev_priv)) {
 		u32 fuse_strap = I915_READ(FUSE_STRAP);
 		u32 sfuse_strap = I915_READ(SFUSE_STRAP);
 
-- 
2.19.1