[Intel-gfx] [RFC 3/7] drm/i915/tgl: Enable DC3CO state in "DC Off" power well
Anshuman Gupta
anshuman.gupta at intel.com
Fri Aug 30 17:44:29 UTC 2019
Add max_dc_state and tgl_set_target_dc_state() API
in order to enable DC3CO state with existing DC states.
max_dc_state will enable/disable the desired DC state in
DC_STATE_EN reg when "DC Off" power well gets disable/enable.
v2: commit log improvement.
v3: Used intel_wait_for_register to wait for DC3CO exit. [Imre]
Used gen9_set_dc_state() to allow/disallow DC3CO. [Imre]
Moved transcoder psr2 exit line enablement from tgl_allow_dc3co()
to a appropriate place haswell_crtc_enable(). [Imre]
Changed the DC3CO power well enabled call back logic as
recommended in review comments. [Imre]
v4: Used wait_for_us() instead of intel_wait_for_reg(). [Imre (IRC)]
v5: using udelay() instead of waiting for DC3CO exit status.
v6: Fixed minor unwanted change.
v7: Removed DC3CO powerwell and POWER_DOMAIN_VIDEO.
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Animesh Manna <animesh.manna at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
.../drm/i915/display/intel_display_power.c | 106 ++++++++++++++----
.../drm/i915/display/intel_display_power.h | 2 +
drivers/gpu/drm/i915/i915_drv.h | 1 +
3 files changed, 89 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 496fa1b53ffb..868197bb4860 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -772,6 +772,29 @@ static void gen9_set_dc_state(struct drm_i915_private *dev_priv, u32 state)
dev_priv->csr.dc_state = val & mask;
}
+static void tgl_allow_dc3co(struct drm_i915_private *dev_priv)
+{
+ if (!dev_priv->psr.sink_psr2_support)
+ return;
+
+ if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO)
+ gen9_set_dc_state(dev_priv, DC_STATE_EN_DC3CO);
+}
+
+static void tgl_disallow_dc3co(struct drm_i915_private *dev_priv)
+{
+ u32 val;
+
+ val = I915_READ(DC_STATE_EN);
+ val &= ~DC_STATE_DC3CO_STATUS;
+ I915_WRITE(DC_STATE_EN, val);
+ gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+ /*
+ * Delay of 200us DC3CO Exit time B.Spec 49196
+ */
+ udelay(200);
+}
+
static void bxt_enable_dc9(struct drm_i915_private *dev_priv)
{
assert_can_enable_dc9(dev_priv);
@@ -939,7 +962,8 @@ static void bxt_verify_ddi_phy_power_wells(struct drm_i915_private *dev_priv)
static bool gen9_dc_off_power_well_enabled(struct drm_i915_private *dev_priv,
struct i915_power_well *power_well)
{
- return (I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5_DC6_MASK) == 0;
+ return ((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC3CO) == 0 &&
+ (I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5_DC6_MASK) == 0);
}
static void gen9_assert_dbuf_enabled(struct drm_i915_private *dev_priv)
@@ -955,24 +979,32 @@ static void gen9_disable_dc_states(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state = {};
- gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+ if (dev_priv->csr.max_dc_state & DC_STATE_EN_DC3CO) {
+ tgl_disallow_dc3co(dev_priv);
+ } else {
+ gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
- dev_priv->display.get_cdclk(dev_priv, &cdclk_state);
- /* Can't read out voltage_level so can't use intel_cdclk_changed() */
- WARN_ON(intel_cdclk_needs_modeset(&dev_priv->cdclk.hw, &cdclk_state));
+ dev_priv->display.get_cdclk(dev_priv, &cdclk_state);
+ /*
+ * Can't read out voltage_level so can't use
+ * intel_cdclk_changed()
+ */
+ WARN_ON(intel_cdclk_needs_modeset(&dev_priv->cdclk.hw,
+ &cdclk_state));
- gen9_assert_dbuf_enabled(dev_priv);
+ gen9_assert_dbuf_enabled(dev_priv);
- if (IS_GEN9_LP(dev_priv))
- bxt_verify_ddi_phy_power_wells(dev_priv);
+ if (IS_GEN9_LP(dev_priv))
+ bxt_verify_ddi_phy_power_wells(dev_priv);
- if (INTEL_GEN(dev_priv) >= 11)
- /*
- * DMC retains HW context only for port A, the other combo
- * PHY's HW context for port B is lost after DC transitions,
- * so we need to restore it manually.
- */
- intel_combo_phy_init(dev_priv);
+ if (INTEL_GEN(dev_priv) >= 11)
+ /*
+ * DMC retains HW context only for port A, the other
+ * combo PHY's HW context for port B is lost after
+ * DC transitions, so we need to restore it manually.
+ */
+ intel_combo_phy_init(dev_priv);
+ }
}
static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
@@ -987,10 +1019,43 @@ static void gen9_dc_off_power_well_disable(struct drm_i915_private *dev_priv,
if (!dev_priv->csr.dmc_payload)
return;
- if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC6)
- skl_enable_dc6(dev_priv);
- else if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC5)
- gen9_enable_dc5(dev_priv);
+ if (dev_priv->csr.max_dc_state & DC_STATE_EN_DC3CO) {
+ tgl_allow_dc3co(dev_priv);
+ } else if (dev_priv->csr.max_dc_state & DC_STATE_EN_UPTO_DC5_DC6_MASK) {
+ if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC6)
+ skl_enable_dc6(dev_priv);
+ else if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC5)
+ gen9_enable_dc5(dev_priv);
+ }
+}
+
+void tgl_set_target_dc_state(struct drm_i915_private *dev_priv, u32 state)
+{
+ struct i915_power_well *power_well;
+ bool dc_off_enabled;
+ struct i915_power_domains *power_domains = &dev_priv->power_domains;
+
+ mutex_lock(&power_domains->lock);
+ power_well = lookup_power_well(dev_priv, TGL_DISP_DC_OFF);
+ dc_off_enabled = power_well->desc->ops->is_enabled(dev_priv,
+ power_well);
+ if (state == dev_priv->csr.max_dc_state)
+ goto unlock;
+
+ if (!dc_off_enabled) {
+ /*
+ * Need to disable the DC off power well to
+ * effect target DC state.
+ */
+ power_well->desc->ops->enable(dev_priv, power_well);
+ dev_priv->csr.max_dc_state = state;
+ power_well->desc->ops->disable(dev_priv, power_well);
+ goto unlock;
+ }
+ dev_priv->csr.max_dc_state = state;
+
+unlock:
+ mutex_unlock(&power_domains->lock);
}
static void i9xx_power_well_sync_hw_noop(struct drm_i915_private *dev_priv,
@@ -3610,7 +3675,7 @@ static const struct i915_power_well_desc tgl_power_wells[] = {
.name = "DC off",
.domains = TGL_DISPLAY_DC_OFF_POWER_DOMAINS,
.ops = &gen9_dc_off_power_well_ops,
- .id = DISP_PW_ID_NONE,
+ .id = TGL_DISP_DC_OFF,
},
{
.name = "power well 2",
@@ -4039,6 +4104,7 @@ int intel_power_domains_init(struct drm_i915_private *dev_priv)
dev_priv->csr.allowed_dc_mask =
get_allowed_dc_mask(dev_priv, i915_modparams.enable_dc);
+ dev_priv->csr.max_dc_state = DC_STATE_EN_UPTO_DC5_DC6_MASK;
BUILD_BUG_ON(POWER_DOMAIN_NUM > 64);
mutex_init(&power_domains->lock);
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h b/drivers/gpu/drm/i915/display/intel_display_power.h
index 737b5def7fc6..1add626da458 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.h
+++ b/drivers/gpu/drm/i915/display/intel_display_power.h
@@ -100,6 +100,7 @@ enum i915_power_well_id {
SKL_DISP_PW_MISC_IO,
SKL_DISP_PW_1,
SKL_DISP_PW_2,
+ TGL_DISP_DC_OFF,
};
#define POWER_DOMAIN_PIPE(pipe) ((pipe) + POWER_DOMAIN_PIPE_A)
@@ -256,6 +257,7 @@ void intel_display_power_suspend_late(struct drm_i915_private *i915);
void intel_display_power_resume_early(struct drm_i915_private *i915);
void intel_display_power_suspend(struct drm_i915_private *i915);
void intel_display_power_resume(struct drm_i915_private *i915);
+void tgl_set_target_dc_state(struct drm_i915_private *dev_priv, u32 state);
const char *
intel_display_power_domain_str(enum intel_display_power_domain domain);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b42651a387d9..efe2eb121309 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -335,6 +335,7 @@ struct intel_csr {
i915_reg_t mmioaddr[20];
u32 mmiodata[20];
u32 dc_state;
+ u32 max_dc_state;
u32 allowed_dc_mask;
intel_wakeref_t wakeref;
};
--
2.21.0
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