[Intel-gfx] [PATCH] drm/i915: Shuffle modeset reset handling around

[Daniel Vetter]

Currently we're doing the reset handling a bit late, and we're doing
it both in the driver load code and on resume. This makes it unusable
for e.g. resetting the panel power sequence state like Paulo wants to.

Instead of adding yet another single-use callback shuffle things
around:
- Output handling code is responsible to reset/init all state on its
  own at driver load time.
- We call the reset functions much earlier, before we start using any
  of the modeset code.

Compared to Paulo's new ->resume callback the only difference in
placement is that ->reset is still called without dev->struct_mutex
held. Which is imo a feature.

v2: Rebase on top of the now merge dinq.

Cc: Paulo Zanoni <przanoni at gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/i915_drv.c      | 2 +-
 drivers/gpu/drm/i915/intel_crt.c     | 2 ++
 drivers/gpu/drm/i915/intel_display.c | 1 -
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 95dcf9de5c80..ce55440b0526 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -643,6 +643,7 @@ static int __i915_drm_thaw(struct drm_device *dev, bool restore_gtt_mappings)
 	/* KMS EnterVT equivalent */
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		intel_init_pch_refclk(dev);
+		drm_mode_config_reset(dev);
 
 		mutex_lock(&dev->struct_mutex);
 
@@ -655,7 +656,6 @@ static int __i915_drm_thaw(struct drm_device *dev, bool restore_gtt_mappings)
 		intel_modeset_init_hw(dev);
 
 		drm_modeset_lock_all(dev);
-		drm_mode_config_reset(dev);
 		intel_modeset_setup_hw_state(dev, true);
 		drm_modeset_unlock_all(dev);
 
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index e2e39e65f109..5b444a4b625c 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -857,4 +857,6 @@ void intel_crt_init(struct drm_device *dev)
 
 		dev_priv->fdi_rx_config = I915_READ(_FDI_RXA_CTL) & fdi_config;
 	}
+
+	intel_crt_reset(connector);
 }
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index dde9802033ec..0c9e249e52e6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11412,7 +11412,6 @@ void intel_modeset_gem_init(struct drm_device *dev)
 	intel_setup_overlay(dev);
 
 	mutex_lock(&dev->mode_config.mutex);
-	drm_mode_config_reset(dev);
 	intel_modeset_setup_hw_state(dev, false);
 	mutex_unlock(&dev->mode_config.mutex);
 }
-- 
1.8.5.2