[PATCH 12/17] drm/i915/icl: track dbuf slice-2 status

Paulo Zanoni
2018-01-23T19:06:03Z

From: Mahesh Kumar <mahesh1.kumar@intel.com>

This patch adds support to start tracking status of DBUF slices.
This is foundation to introduce support for enabling/disabling second
DBUF slice dynamically for ICL.

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 5 +++++
drivers/gpu/drm/i915/intel_pm.c | 20 ++++++++++++++++++++
drivers/gpu/drm/i915/intel_runtime_pm.c | 4 ++++
4 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index cc5ac327f267..eae18661eaec 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1435,6 +1435,7 @@ static inline bool skl_ddb_entry_equal(const struct skl_ddb_entry *e1,
struct skl_ddb_allocation {
struct skl_ddb_entry plane[I915_MAX_PIPES][I915_MAX_PLANES]; /* packed/uv */
struct skl_ddb_entry y_plane[I915_MAX_PIPES][I915_MAX_PLANES];
+ uint8_t enabled_slices; /* GEN11 has configurable 2 slices */
};

struct skl_wm_values {
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0dc4ef6cd46e..bad3b112ac3e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11302,6 +11302,11 @@ static void verify_wm_state(struct drm_crtc *crtc,
skl_ddb_get_hw_state(dev_priv, &hw_ddb);
sw_ddb = &dev_priv->wm.skl_hw.ddb;

+ if (INTEL_GEN(dev_priv) >= 11)
+ if (hw_ddb.enabled_slices != sw_ddb->enabled_slices)
+ DRM_ERROR("mismatch in DBUF Slices (expected %u, got %u)\n",
+ sw_ddb->enabled_slices,
+ hw_ddb.enabled_slices);
/* planes */
for_each_universal_plane(dev_priv, pipe, plane) {
hw_plane_wm = &hw_wm.planes[plane];
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0237362ccf83..e8d98857c208 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3570,6 +3570,23 @@ bool ilk_disable_lp_wm(struct drm_device *dev)
return _ilk_disable_lp_wm(dev_priv, WM_DIRTY_LP_ALL);
}

+static uint8_t intel_enabled_dbuf_slices_num(struct drm_i915_private *dev_priv)
+{
+ uint8_t enabled_slices;
+
+ /* Slice 1 will always be enabled */
+ enabled_slices = 1;
+
+ /* Gen prior to GEN11 have only one DBuf slice */
+ if (INTEL_GEN(dev_priv) < 11)
+ return enabled_slices;
+
+ if (I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE)
+ enabled_slices++;
+
+ return enabled_slices;
+}
+
/*
* FIXME: We still don't have the proper code detect if we need to apply the WA,
* so assume we'll always need it in order to avoid underruns.
@@ -3828,6 +3845,8 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,

memset(ddb, 0, sizeof(*ddb));

+ ddb->enabled_slices = intel_enabled_dbuf_slices_num(dev_priv);
+
for_each_intel_crtc(&dev_priv->drm, crtc) {
enum intel_display_power_domain power_domain;
enum plane_id plane_id;
@@ -5049,6 +5068,7 @@ skl_copy_wm_for_pipe(struct skl_wm_values *dst,
sizeof(dst->ddb.y_plane[pipe]));
memcpy(dst->ddb.plane[pipe], src->ddb.plane[pipe],
sizeof(dst->ddb.plane[pipe]));
+ dst->ddb.enabled_slices = src->ddb.enabled_slices;
}

static void
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index a6ed01a528bd..13c8dad95b84 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2625,6 +2625,8 @@ static void icl_dbuf_enable(struct drm_i915_private *dev_priv)
if (!(I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE) ||
!(I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE))
DRM_ERROR("DBuf power enable timeout\n");
+ else
+ dev_priv->wm.skl_hw.ddb.enabled_slices = 2;
}

static void icl_dbuf_disable(struct drm_i915_private *dev_priv)
@@ -2638,6 +2640,8 @@ static void icl_dbuf_disable(struct drm_i915_private *dev_priv)
if ((I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE) ||
(I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE))
DRM_ERROR("DBuf power disable timeout!\n");
+ else
+ dev_priv->wm.skl_hw.ddb.enabled_slices = 0;
}

static void icl_mbus_init(struct drm_i915_private *dev_priv)
--
2.14.3