Mmio register access after dc6/dc5 entry is not allowed when
DC6 power states are enabled according to bspec (bspec-id 0527),
so enabling dc6 as the last call in suspend flow.
v1: Initial version.
v2: Based on review comment from Daniel,
- created a seperate patch for csr uninitialization set call.
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Damien Lespiau <damien.lespiau@xxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Sunil Kamath <sunil.kamath@xxxxxxxxx>
Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju@xxxxxxxxx>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 13 +++++++++++++
drivers/gpu/drm/i915/intel_drv.h | 2 ++
drivers/gpu/drm/i915/intel_runtime_pm.c | 19 +++++++------------
3 files changed, 22 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 478101c..fa66162 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1013,10 +1013,20 @@ static int i915_pm_resume(struct device *dev)
static int skl_suspend_complete(struct drm_i915_private *dev_priv)
{
+ enum csr_state state;
/* Enabling DC6 is not a hard requirement to enter runtime D3 */
skl_uninit_cdclk(dev_priv);
+ /* TODO: wait for a completion event or
+ * similar here instead of busy
+ * waiting using wait_for function.
+ */
+ wait_for((state = intel_csr_load_status_get(dev_priv)) !=
+ FW_UNINITIALIZED, 1000);
+ if (state == FW_LOADED)
+ skl_enable_dc6(dev_priv);
+
return 0;
}
@@ -1063,6 +1073,9 @@ static int skl_resume_prepare(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
+ if (intel_csr_load_status_get(dev_priv) == FW_LOADED)
+ skl_disable_dc6(dev_priv);
+
skl_init_cdclk(dev_priv);
intel_csr_load_program(dev);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 81b7d77..9cb7d4e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1118,6 +1118,8 @@ void bxt_enable_dc9(struct drm_i915_private *dev_priv);
void bxt_disable_dc9(struct drm_i915_private *dev_priv);
void skl_init_cdclk(struct drm_i915_private *dev_priv);
void skl_uninit_cdclk(struct drm_i915_private *dev_priv);
+void skl_enable_dc6(struct drm_i915_private *dev_priv);
+void skl_disable_dc6(struct drm_i915_private *dev_priv);
void intel_dp_get_m_n(struct intel_crtc *crtc,
struct intel_crtc_state *pipe_config);
void intel_dp_set_m_n(struct intel_crtc *crtc, enum link_m_n_set m_n);
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 821644d..23a3aa3 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -548,7 +548,7 @@ static void assert_can_disable_dc6(struct drm_i915_private *dev_priv)
"DC6 already programmed to be disabled.\n");
}
-static void skl_enable_dc6(struct drm_i915_private *dev_priv)
+void skl_enable_dc6(struct drm_i915_private *dev_priv)
{
uint32_t val;
@@ -565,7 +565,7 @@ static void skl_enable_dc6(struct drm_i915_private *dev_priv)
POSTING_READ(DC_STATE_EN);
}
-static void skl_disable_dc6(struct drm_i915_private *dev_priv)
+void skl_disable_dc6(struct drm_i915_private *dev_priv)
{
uint32_t val;
@@ -626,10 +626,10 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
!I915_READ(HSW_PWR_WELL_BIOS),
"Invalid for power well status to be enabled, unless done by the BIOS, \
when request is to disable!\n");
- if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
- power_well->data == SKL_DISP_PW_2) {
+ if (power_well->data == SKL_DISP_PW_2) {
+ if (GEN9_ENABLE_DC5(dev))
+ gen9_disable_dc5(dev_priv);
if (SKL_ENABLE_DC6(dev)) {
- skl_disable_dc6(dev_priv);
/*
* DDI buffer programming unnecessary during driver-load/resume
* as it's already done during modeset initialization then.
@@ -637,8 +637,6 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
*/
if (!dev_priv->power_domains.initializing)
intel_prepare_ddi(dev);
- } else {
- gen9_disable_dc5(dev_priv);
}
}
I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask);
@@ -658,7 +656,7 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
POSTING_READ(HSW_PWR_WELL_DRIVER);
DRM_DEBUG_KMS("Disabling %s\n", power_well->name);
- if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
+ if (GEN9_ENABLE_DC5(dev) &&
power_well->data == SKL_DISP_PW_2) {
enum csr_state state;
/* TODO: wait for a completion event or
@@ -671,10 +669,7 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
DRM_ERROR("CSR firmware not ready (%d)\n",
state);
else
- if (SKL_ENABLE_DC6(dev))
- skl_enable_dc6(dev_priv);
- else
- gen9_enable_dc5(dev_priv);
+ gen9_enable_dc5(dev_priv);
}
}
}
--
2.0.2
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