On Fri, Mar 23, 2018 at 03:22:35PM +0200, Ville Syrjälä wrote:

On Thu, Mar 22, 2018 at 04:36:42PM +0200, Imre Deak wrote:

...

After

commit dd9f31c7a3887950cbd0d49eb9d43f7a1518a356 Author: Imre Deak imre.deak@intel.com Date: Wed Aug 16 17:46:07 2017 +0300

drm/i915/gen9+: Set same power state before hibernation image
save/restore

during hibernation/suspend the power domain functionality got disabled, after which resume could leave it incorrectly disabled if the ACPI target state was S0 during suspend and i915 was not loaded by the loader kernel.

This was caused by not considering if we resumed from hibernation as the condition for power domains reiniting.

Fix this by simply tracking if we suspended power domains during system suspend and reinit power domains accordingly during resume. This will result in reiniting power domains always when resuming from hibernation, regardless of the platform and whether or not i915 is loaded by the loader kernel.

The reason we didn't catch this earlier is that the enabled/disabled state of power domains during PMSG_FREEZE/PMSG_QUIESCE is platform and kernel config dependent: on my SKL the target state is S4 during PMSG_FREEZE and (with the driver loaded in the loader kernel) S0 during PMSG_QUIESCE. On the reporter's machine it's S0 during PMSG_FREEZE but (contrary to this) power domains are not initialized during PMSG_QUIESCE since i915 is not loaded in the loader kernel, or it's loaded but without the DMC firmware being available.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105196 Reported-and-tested-by: amn-bas@hotmail.com Fixes: dd9f31c7a388 ("drm/i915/gen9+: Set same power state before hibernation image save/restore") Cc: amn-bas@hotmail.com Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: stable@vger.kernel.org Signed-off-by: Imre Deak imre.deak@intel.com

Make sense to me. Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com

On thing I can't quite tell is what happens with switcheroo. Maybe it's not even relevant for platforms with DC6 in which case I suppose it should work correctly.

Yep I haven't noticed that issue. On GEN9+ big core machines hibernating from a switcheroo off state looks broken for a similar reason: Switcheroo-off on those machines corresponds to suspending to idle and so DC6, but after resuming from hibernation power domains and so DC states will be disabled.

The following is one way to fix that preventing s2idle for switcheroo. Since it's a separate existing issue I could send a proper patch as a follow-up.

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index f706cff4f01b..a1c188c9ef05 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1608,7 +1608,7 @@ static int i915_drm_suspend(struct drm_device *dev) return error; }

-static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation) +static int i915_drm_suspend_late(struct drm_device *dev, bool allow_s2idle) { struct drm_i915_private *dev_priv = to_i915(dev); struct pci_dev *pdev = dev_priv->drm.pdev; @@ -1625,7 +1625,7 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation) * also enable deeper system power states that would be blocked if the * firmware was inactive. */ - if (IS_GEN9_LP(dev_priv) || hibernation || !suspend_to_idle(dev_priv) || + if (IS_GEN9_LP(dev_priv) || !allow_s2idle || !suspend_to_idle(dev_priv) || dev_priv->csr.dmc_payload == NULL) { intel_power_domains_suspend(dev_priv); dev_priv->power_domains_suspended = true; @@ -1662,7 +1662,7 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation) * Fujitsu FSC S7110 * Acer Aspire 1830T */ - if (!(hibernation && INTEL_GEN(dev_priv) < 6)) + if (allow_s2idle || INTEL_GEN(dev_priv) >= 6) pci_set_power_state(pdev, PCI_D3hot);

out: @@ -2100,7 +2100,7 @@ static int i915_pm_suspend_late(struct device *kdev) if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) return 0;

- return i915_drm_suspend_late(dev, false); + return i915_drm_suspend_late(dev, true); }

static int i915_pm_poweroff_late(struct device *kdev) @@ -2110,7 +2110,7 @@ static int i915_pm_poweroff_late(struct device *kdev) if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) return 0;

- return i915_drm_suspend_late(dev, true); + return i915_drm_suspend_late(dev, false); }

static int i915_pm_resume_early(struct device *kdev) @@ -2158,7 +2158,7 @@ static int i915_pm_freeze_late(struct device *kdev) int ret;

if (dev->switch_power_state != DRM_SWITCH_POWER_OFF) { - ret = i915_drm_suspend_late(dev, true); + ret = i915_drm_suspend_late(dev, false); if (ret) return ret; }

...

---

drivers/gpu/drm/i915/i915_drv.c | 22 ++++++++++------------ drivers/gpu/drm/i915/i915_drv.h | 2 +- 2 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index a7d3275f45d2..f706cff4f01b 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1612,15 +1612,12 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation) { struct drm_i915_private *dev_priv = to_i915(dev); struct pci_dev *pdev = dev_priv->drm.pdev;

• bool fw_csr; int ret;

disable_rpm_wakeref_asserts(dev_priv); intel_display_set_init_power(dev_priv, false);

• 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
  • deinit the power domains. This also means the CSR/DMC firmware will

@@ -1628,8 +1625,11 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation) * also enable deeper system power states that would be blocked if the * firmware was inactive. */

• if (!fw_csr)

• if (IS_GEN9_LP(dev_priv) || hibernation || !suspend_to_idle(dev_priv) ||

•    dev_priv->csr.dmc_payload == NULL) {
  

  intel_power_domains_suspend(dev_priv);

• dev_priv->power_domains_suspended = true;
  

• }

ret = 0; if (IS_GEN9_LP(dev_priv)) @@ -1641,8 +1641,10 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation) if (ret) { DRM_ERROR("Suspend complete failed: %d\n", ret);

• if (!fw_csr)
  

• if (dev_priv->power_domains_suspended) {
  intel_power_domains_init_hw(dev_priv, true);
  

• 	dev_priv->power_domains_suspended = false;
  

• }
  

goto out; } @@ -1663,8 +1665,6 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation) if (!(hibernation && INTEL_GEN(dev_priv) < 6)) pci_set_power_state(pdev, PCI_D3hot);

• dev_priv->suspended_to_idle = suspend_to_idle(dev_priv);

out: enable_rpm_wakeref_asserts(dev_priv); @@ -1831,8 +1831,7 @@ static int i915_drm_resume_early(struct drm_device *dev) intel_uncore_resume_early(dev_priv); if (IS_GEN9_LP(dev_priv)) {

• if (!dev_priv->suspended_to_idle)
  

• 	gen9_sanitize_dc_state(dev_priv);
  

• gen9_sanitize_dc_state(dev_priv);
  

  bxt_disable_dc9(dev_priv); } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) { hsw_disable_pc8(dev_priv);

@@ -1840,8 +1839,7 @@ static int i915_drm_resume_early(struct drm_device *dev) intel_uncore_sanitize(dev_priv);

• if (IS_GEN9_LP(dev_priv) ||

•    !(dev_priv->suspended_to_idle && dev_priv->csr.dmc_payload))
  

• if (dev_priv->power_domains_suspended) intel_power_domains_init_hw(dev_priv, true); else intel_display_set_init_power(dev_priv, true);

@@ -1851,7 +1849,7 @@ static int i915_drm_resume_early(struct drm_device *dev) enable_rpm_wakeref_asserts(dev_priv); out:

• dev_priv->suspended_to_idle = false;

• dev_priv->power_domains_suspended = false;

return ret; } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index c9c3b2ba6a86..3acc4bbec6b2 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1851,7 +1851,7 @@ struct drm_i915_private { u32 bxt_phy_grc; u32 suspend_count;

• bool suspended_to_idle;

• bool power_domains_suspended; struct i915_suspend_saved_registers regfile; struct vlv_s0ix_state vlv_s0ix_state;

2.13.2

-- Ville Syrjälä Intel OTC