From dd9f31c7a3887950cbd0d49eb9d43f7a1518a356 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Wed, 16 Aug 2017 17:46:07 +0300 Subject: [PATCH] drm/i915/gen9+: Set same power state before hibernation image save/restore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Atm, on GEN9 big core platforms before saving the hibernation image we uninitialize the display, disabling power wells manually, while before restoring the image we keep things powered (letting HW/DMC power down things as needed). The state mismatch will trigger the following error: DC state mismatch (0x0 -> 0x2) While the restore handler knows how to initialize the display from an unknown state (due to a different loader kernel or not having i915 loaded in the loader kernel) we should still use the same state for consistency before image saving and restoring. Do this by uniniting the display before restoring the image too. Bugzilla: https://bugs.freedesktop.org/attachment.cgi?id=133376 Reported-and-tested-by: Wang Wendy Reported-and-tested-by: Joonas Lahtinen Cc: Wang Wendy Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Ville Syrjala Signed-off-by: Imre Deak Reviewed-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20170816144607.9935-1-imre.deak@intel.com --- drivers/gpu/drm/i915/i915_drv.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 59ac9199b35d..5cc24344c266 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1580,7 +1580,7 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation) intel_display_set_init_power(dev_priv, false); - fw_csr = !IS_GEN9_LP(dev_priv) && + fw_csr = !IS_GEN9_LP(dev_priv) && !hibernation && suspend_to_idle(dev_priv) && dev_priv->csr.dmc_payload; /* * In case of firmware assisted context save/restore don't manually @@ -2070,11 +2070,14 @@ static int i915_pm_resume(struct device *kdev) /* freeze: before creating the hibernation_image */ static int i915_pm_freeze(struct device *kdev) { + struct drm_device *dev = &kdev_to_i915(kdev)->drm; int ret; - ret = i915_pm_suspend(kdev); - if (ret) - return ret; + if (dev->switch_power_state != DRM_SWITCH_POWER_OFF) { + ret = i915_drm_suspend(dev); + if (ret) + return ret; + } ret = i915_gem_freeze(kdev_to_i915(kdev)); if (ret) @@ -2085,11 +2088,14 @@ static int i915_pm_freeze(struct device *kdev) static int i915_pm_freeze_late(struct device *kdev) { + struct drm_device *dev = &kdev_to_i915(kdev)->drm; int ret; - ret = i915_pm_suspend_late(kdev); - if (ret) - return ret; + if (dev->switch_power_state != DRM_SWITCH_POWER_OFF) { + ret = i915_drm_suspend_late(dev, true); + if (ret) + return ret; + } ret = i915_gem_freeze_late(kdev_to_i915(kdev)); if (ret) -- GitLab