[Intel-gfx] [PATCH 2/2] drm/i915: Enable fast modesetting again.

[Maarten Lankhorst]

This was reverted in commit 7383123647566, but reverted when a
Chromebook Pixel (2015) regression was reported.

Jani wrote a patch to fix backlight, but that one has been completely
ignored by the original reporter of the bug.

We now have more testcases for fastset, so it should be possible to
enable with some confidence about regressions.

Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Olof Johansson <olof at lixom.net>
Testcase: kms_panel_fitting
---
 drivers/gpu/drm/i915/i915_params.c   | 5 -----
 drivers/gpu/drm/i915/i915_params.h   | 1 -
 drivers/gpu/drm/i915/intel_display.c | 3 +--
 3 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 768ad89d9cd4..0f90138cd881 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -42,7 +42,6 @@ struct i915_params i915 __read_mostly = {
 	.preliminary_hw_support = IS_ENABLED(CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT),
 	.disable_power_well = -1,
 	.enable_ips = 1,
-	.fastboot = 0,
 	.prefault_disable = 0,
 	.load_detect_test = 0,
 	.force_reset_modeset_test = 0,
@@ -148,10 +147,6 @@ MODULE_PARM_DESC(disable_power_well,
 module_param_named_unsafe(enable_ips, i915.enable_ips, int, 0600);
 MODULE_PARM_DESC(enable_ips, "Enable IPS (default: true)");
 
-module_param_named(fastboot, i915.fastboot, bool, 0600);
-MODULE_PARM_DESC(fastboot,
-	"Try to skip unnecessary mode sets at boot time (default: false)");
-
 module_param_named_unsafe(prefault_disable, i915.prefault_disable, bool, 0600);
 MODULE_PARM_DESC(prefault_disable,
 	"Disable page prefaulting for pread/pwrite/reloc (default:false). "
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 3a0dd78ddb38..749f6c48a69b 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -54,7 +54,6 @@ struct i915_params {
 	unsigned int inject_load_failure;
 	/* leave bools at the end to not create holes */
 	bool enable_hangcheck;
-	bool fastboot;
 	bool prefault_disable;
 	bool load_detect_test;
 	bool force_reset_modeset_test;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0af6ce3d7dde..dee2e85aedb3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13898,8 +13898,7 @@ static int intel_atomic_check(struct drm_device *dev,
 			return ret;
 		}
 
-		if (i915.fastboot &&
-		    intel_pipe_config_compare(dev,
+		if (intel_pipe_config_compare(dev,
 					to_intel_crtc_state(crtc->state),
 					pipe_config, true)) {
 			crtc_state->mode_changed = false;
-- 
2.7.4