[Intel-gfx] [PATCH v4 4/8] drm/i915/skl: Assert the requirements to enter or exit DC5.
Animesh Manna
animesh.manna at intel.com
Thu Apr 16 01:52:10 PDT 2015
From: Suketu Shah <suketu.j.shah at intel.com>
Warn if the conditions to enter or exit DC5 are not satisfied such
as support for runtime PM, state of power well, CSR loading etc.
v2: Removed camelcase in functions and variables.
v3: Do some minimal check to assert if CSR program is not loaded.
v4:
1] Used an appropriate function lookup_power_well() to identify power well,
instead of using a magic number which can change in future.
2] Split the conditions further in assert_can_enable_DC5() and added more checks.
3] Removed all WARNs from assert_can_disable_DC5 as they were unnecessary and added two
new ones.
4] Changed variable names as updated in earlier patches.
v5:
1] Change lookup_power_well function to take an int power well id.
2] Define a new intel_display_power_well_is_enabled helper function to check whether a
particular power well is enabled.
3] Use CSR-related mutex in assert_csr_loaded function.
v6: Remove use of dc5_enabled variable as it's no longer needed.
v7:
1] Rebase to latest.
2] Move all DC5-related functions from intel_display.c to intel_runtime_pm.c.
v8: After adding dmc ver 1.0 support rebased on top of nightly. (Animesh)
v9: Modified below changes based on review comments from Imre.
- Moved intel_display_power_well_is_enabled() to intel_runtime_pm.c.
- Removed mutex lock from assert_csr_loaded(). (Animesh)
Issue: VIZ-2819
Signed-off-by: A.Sunil Kamath <sunil.kamath at intel.com>
Signed-off-by: Suketu Shah <suketu.j.shah at intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
drivers/gpu/drm/i915/intel_csr.c | 9 ++++++
drivers/gpu/drm/i915/intel_drv.h | 1 +
drivers/gpu/drm/i915/intel_runtime_pm.c | 51 +++++++++++++++++++++++++++++----
3 files changed, 56 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index fe6789f..d58effe 100644
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -410,3 +410,12 @@ void intel_csr_ucode_fini(struct drm_device *dev)
intel_csr_load_status_set(dev_priv, FW_FAILED);
kfree(dev_priv->csr.dmc_payload);
}
+
+void assert_csr_loaded(struct drm_i915_private *dev_priv)
+{
+ WARN((intel_csr_load_status_get(dev_priv) != FW_LOADED), "CSR is not loaded.\n");
+ WARN(!I915_READ(CSR_PROGRAM_BASE),
+ "CSR program storage start is NULL\n");
+ WARN(!I915_READ(CSR_SSP_BASE), "CSR SSP Base Not fine\n");
+ WARN(!I915_READ(CSR_HTP_SKL), "CSR HTP Not fine\n");
+}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 25d7956..2eb0169 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1069,6 +1069,7 @@ void intel_csr_load_status_set(struct drm_i915_private *dev_priv,
enum csr_state state);
void intel_csr_load_program(struct drm_device *dev);
void intel_csr_ucode_fini(struct drm_device *dev);
+void assert_csr_loaded(struct drm_i915_private *dev_priv);
/* intel_dp.c */
void intel_dp_init(struct drm_device *dev, int output_reg, enum port port);
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 466ea69..da8c18d 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -64,6 +64,9 @@
i--) \
if ((power_well)->domains & (domain_mask))
+bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
+ int power_well_id);
+
/*
* We should only use the power well if we explicitly asked the hardware to
* enable it, so check if it's enabled and also check if we've requested it to
@@ -335,12 +338,39 @@ static void gen9_set_dc_state_debugmask_memory_up(
}
}
-static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
+static void assert_can_enable_dc5(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
+ bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
+ SKL_DISP_PW_2);
+
+ WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC5.\n");
+ WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
+ WARN(pg2_enabled, "PG2 not disabled to enable DC5.\n");
+
+ WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5),
+ "DC5 already programmed to be enabled.\n");
+ WARN(dev_priv->pm.suspended,
+ "DC5 cannot be enabled, if platform is runtime-suspended.\n");
+
+ assert_csr_loaded(dev_priv);
+}
+
+static void assert_can_disable_dc5(struct drm_i915_private *dev_priv)
+{
+ bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
+ SKL_DISP_PW_2);
+
+ WARN(!pg2_enabled, "PG2 not enabled to disable DC5.\n");
+ WARN(dev_priv->pm.suspended,
+ "Disabling of DC5 while platform is runtime-suspended should never happen.\n");
+}
+
+static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
+{
uint32_t val;
- WARN_ON(!IS_GEN9(dev));
+ assert_can_enable_dc5(dev_priv);
DRM_DEBUG_KMS("Enabling DC5\n");
@@ -355,10 +385,9 @@ static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
static void gen9_disable_dc5(struct drm_i915_private *dev_priv)
{
- struct drm_device *dev = dev_priv->dev;
uint32_t val;
- WARN_ON(!IS_GEN9(dev));
+ assert_can_disable_dc5(dev_priv);
DRM_DEBUG_KMS("Disabling DC5\n");
@@ -1318,7 +1347,7 @@ static struct i915_power_well chv_power_wells[] = {
};
static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_priv,
- enum punit_power_well power_well_id)
+ int power_well_id)
{
struct i915_power_domains *power_domains = &dev_priv->power_domains;
struct i915_power_well *power_well;
@@ -1332,6 +1361,18 @@ static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_pr
return NULL;
}
+bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
+ int power_well_id)
+{
+ struct i915_power_well *power_well;
+ bool ret;
+
+ power_well = lookup_power_well(dev_priv, power_well_id);
+ ret = power_well->ops->is_enabled(dev_priv, power_well);
+
+ return ret;
+}
+
static struct i915_power_well skl_power_wells[] = {
{
.name = "always-on",
--
2.0.2
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