DC9 entry and exit programming is critical part of suspend/resume
sequences. This patch adds tracepoints that can help analyze time
taken using analyze_suspend.py/FTrace.
Change-Id: I22fca5313c4349f8937eeb5a1c441c8ef76e5f4e
Signed-off-by: Sagar Arun Kamble <sagar.a.kam...@intel.com>
---
drivers/gpu/drm/i915/i915_drv.c | 9 +++++++++
drivers/gpu/drm/i915/i915_reg.h | 1 +
2 files changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 78ef0bb..6797650 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -39,6 +39,7 @@
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <drm/drm_crtc_helper.h>
+#include <trace/events/power.h>
static struct drm_driver driver;
@@ -1061,12 +1062,16 @@ static int bxt_suspend_complete(struct drm_i915_private
*dev_priv)
{
struct drm_device *dev = dev_priv->dev;
+ trace_suspend_resume(TPS("dc_state_entry"), DC9_STATE, true);
+
/* TODO: when DC5 support is added disable DC5 here. */
broxton_ddi_phy_uninit(dev);
broxton_uninit_cdclk(dev);
bxt_enable_dc9(dev_priv);
+ trace_suspend_resume(TPS("dc_state_entry"), DC9_STATE, false);
+
return 0;
}
@@ -1076,6 +1081,8 @@ static int bxt_resume_prepare(struct drm_i915_private
*dev_priv)
/* TODO: when CSR FW support is added make sure the FW is loaded */
+ trace_suspend_resume(TPS("dc_state_exit"), DC9_STATE, true);
+
bxt_disable_dc9(dev_priv);
/*
@@ -1086,6 +1093,8 @@ static int bxt_resume_prepare(struct drm_i915_private
*dev_priv)
broxton_ddi_phy_init(dev);
intel_prepare_ddi(dev);
+ trace_suspend_resume(TPS("dc_state_exit"), DC9_STATE, false);
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0b979ad..cf83ec8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7290,6 +7290,7 @@ enum skl_disp_power_wells {
#define DC_STATE_EN_DC9 (1<<3)
#define DC_STATE_EN_UPTO_DC6 (2<<0)
#define DC_STATE_EN_UPTO_DC5_DC6_MASK 0x3
+#define DC9_STATE 9
#define DC_STATE_DEBUG 0x45520
#define DC_STATE_DEBUG_MASK_MEMORY_UP (1<<1)
--
1.9.1
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