From 5fbd0418eef283269f2cc1b90b63d88f20c887bf Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 6 May 2016 21:35:55 +0300 Subject: [PATCH] drm/i915: Re-enable GGTT earlier during resume on pre-gen6 platforms MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Move the intel_enable_gtt() call to happen before we touch the GTT during resume. Right now it's done way too late. Before commit ebb7c78d358b ("agp/intel-gtt: Only register fake agp driver for gen1") it was actually done earlier on account of also getting called from the resume hook of the fake agp driver. With the fake agp driver no longer getting registered we must move the call up. The symptoms I've seen on my 830 machine include lowmem corruption, other kinds of memory corruption, and straight up hung machine during or just after resume. Not really sure what causes the memory corruption, but so far I've not seen any with this fix. I think we shouldn't really need to call this during init, but we have been doing that so I've decided to keep the call. However moving that call earlier could be prudent as well. Doing it right after the intel-gtt probe seems appropriate. Also tested this on 946gz,elk,ilk and all seemed quite happy with this change. v2: Reorder init_hw vs. enable_hw functions (Chris) Cc: Daniel Vetter Cc: drm-intel-fixes@lists.freedesktop.org Fixes: ebb7c78d358b ("agp/intel-gtt: Only register fake agp driver for gen1") Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1462559755-353-1-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Chris Wilson (cherry picked from commit ac840ae53573d9f435c88c131f6707a79aecb466) Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/i915_dma.c | 6 ++++++ drivers/gpu/drm/i915/i915_drv.c | 5 +++++ drivers/gpu/drm/i915/i915_gem.c | 3 --- drivers/gpu/drm/i915/i915_gem_gtt.c | 8 ++++++++ drivers/gpu/drm/i915/i915_gem_gtt.h | 1 + 5 files changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 5c7615041b31..157af1433889 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1186,6 +1186,12 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv) if (ret) return ret; + ret = i915_ggtt_enable_hw(dev); + if (ret) { + DRM_ERROR("failed to enable GGTT\n"); + goto out_ggtt; + } + /* WARNING: Apparently we must kick fbdev drivers before vgacon, * otherwise the vga fbdev driver falls over. */ ret = i915_kick_out_firmware_fb(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 7a0e4d6c71e2..dd36760f7da6 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -734,9 +734,14 @@ int i915_suspend_switcheroo(struct drm_device *dev, pm_message_t state) static int i915_drm_resume(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; + int ret; disable_rpm_wakeref_asserts(dev_priv); + ret = i915_ggtt_enable_hw(dev); + if (ret) + DRM_ERROR("failed to re-enable GGTT\n"); + intel_csr_ucode_resume(dev_priv); mutex_lock(&dev->struct_mutex); diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index a14a98341a4b..640c6c1ee72e 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -4860,9 +4860,6 @@ i915_gem_init_hw(struct drm_device *dev) struct intel_engine_cs *engine; int ret, j; - if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt()) - return -EIO; - /* Double layer security blanket, see i915_gem_init() */ intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 0d666b3f7e9b..92acdff9dad3 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -3236,6 +3236,14 @@ out_gtt_cleanup: return ret; } +int i915_ggtt_enable_hw(struct drm_device *dev) +{ + if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt()) + return -EIO; + + return 0; +} + void i915_gem_restore_gtt_mappings(struct drm_device *dev) { struct drm_i915_private *dev_priv = to_i915(dev); diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h index d7dd3d8a8758..0008543d55f6 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.h +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h @@ -514,6 +514,7 @@ i915_page_dir_dma_addr(const struct i915_hw_ppgtt *ppgtt, const unsigned n) } int i915_ggtt_init_hw(struct drm_device *dev); +int i915_ggtt_enable_hw(struct drm_device *dev); void i915_gem_init_ggtt(struct drm_device *dev); void i915_ggtt_cleanup_hw(struct drm_device *dev); -- 2.20.1