[Intel-gfx] [PATCH 2/3] drm/i915/icl: Enable 2nd DBuf slice only when needed
Mahesh Kumar
mahesh1.kumar at intel.com
Thu Apr 5 06:00:18 UTC 2018
ICL has two slices of DBuf, each slice of size 1024 blocks.
We should not always enable slice-2. It should be enabled only if
display total required BW is > 12GBps OR more than 1 pipes are enabled.
Changes since V1:
- typecast total_data_rate to u64 before multiplication to solve any
possible overflow (Rodrigo)
- fix where skl_wm_get_hw_state was memsetting ddb, resulting
enabled_slices to become zero
- Fix the logic of calculating ddb_size
Changes since V2:
- If no-crtc is part of commit required_slices will have value "0",
don't try to disable DBuf slice.
Changes since V3:
- Create a generic helper to enable/disable slice
- don't return early if total_data_rate is 0, it may be cursor only
commit, or atomic modeset without any plane.
Signed-off-by: Mahesh Kumar <mahesh1.kumar at intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 10 +++++
drivers/gpu/drm/i915/intel_drv.h | 6 +++
drivers/gpu/drm/i915/intel_pm.c | 57 +++++++++++++++++++++++------
drivers/gpu/drm/i915/intel_runtime_pm.c | 65 ++++++++++++++++++++++++++-------
4 files changed, 113 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 96a1e6a7f69e..bc795307657a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12196,6 +12196,8 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
bool progress;
enum pipe pipe;
int i;
+ uint8_t hw_enabled_slices = dev_priv->wm.skl_hw.ddb.enabled_slices;
+ uint8_t required_slices = intel_state->wm_results.ddb.enabled_slices;
const struct skl_ddb_entry *entries[I915_MAX_PIPES] = {};
@@ -12204,6 +12206,10 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
if (new_crtc_state->active)
entries[i] = &to_intel_crtc_state(old_crtc_state)->wm.skl.ddb;
+ /* If 2nd DBuf slice required, enable it here */
+ if (INTEL_GEN(dev_priv) >= 11 && required_slices > hw_enabled_slices)
+ icl_dbuf_slices_update(dev_priv, required_slices);
+
/*
* Whenever the number of active pipes changes, we need to make sure we
* update the pipes in the right order so that their ddb allocations
@@ -12254,6 +12260,10 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
progress = true;
}
} while (progress);
+
+ /* If 2nd DBuf slice is no more required disable it */
+ if (INTEL_GEN(dev_priv) >= 11 && required_slices < hw_enabled_slices)
+ icl_dbuf_slices_update(dev_priv, required_slices);
}
static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index d1452fd2a58d..473a1ad7f32b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -140,6 +140,10 @@
#define KHz(x) (1000 * (x))
#define MHz(x) KHz(1000 * (x))
+#define KBps(x) (1000 * (x))
+#define MBps(x) KBps(1000 * (x))
+#define GBps(x) ((uint64_t) 1000 * MBps((x)))
+
/*
* Display related stuff
*/
@@ -1914,6 +1918,8 @@ bool intel_display_power_get_if_enabled(struct drm_i915_private *dev_priv,
enum intel_display_power_domain domain);
void intel_display_power_put(struct drm_i915_private *dev_priv,
enum intel_display_power_domain domain);
+void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
+ uint8_t req_slices);
static inline void
assert_rpm_device_not_suspended(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3ff37d5ba353..caa29f949335 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3771,9 +3771,42 @@ bool intel_can_enable_sagv(struct drm_atomic_state *state)
return true;
}
+static unsigned int intel_get_ddb_size(struct drm_i915_private *dev_priv,
+ const struct intel_crtc_state *cstate,
+ const unsigned int total_data_rate,
+ const int num_active,
+ struct skl_ddb_allocation *ddb)
+{
+ const struct drm_display_mode *adjusted_mode;
+ u64 total_data_bw;
+ u16 ddb_size = INTEL_INFO(dev_priv)->ddb_size;
+
+ WARN_ON(ddb_size == 0);
+
+ if (INTEL_GEN(dev_priv) < 11)
+ return ddb_size - 4; /* 4 blocks for bypass path allocation */
+
+ adjusted_mode = &cstate->base.adjusted_mode;
+ total_data_bw = (u64)total_data_rate * drm_mode_vrefresh(adjusted_mode);
+
+ /*
+ * 12GB/s is maximum BW supported by single DBuf slice.
+ */
+ if (total_data_bw >= GBps(12) || num_active > 1)
+ ddb->enabled_slices = 2;
+ else {
+ ddb->enabled_slices = 1;
+ ddb_size /= 2;
+ }
+
+ return ddb_size;
+}
+
static void
skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
const struct intel_crtc_state *cstate,
+ const unsigned int total_data_rate,
+ struct skl_ddb_allocation *ddb,
struct skl_ddb_entry *alloc, /* out */
int *num_active /* out */)
{
@@ -3796,11 +3829,8 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
else
*num_active = hweight32(dev_priv->active_crtcs);
- ddb_size = INTEL_INFO(dev_priv)->ddb_size;
- WARN_ON(ddb_size == 0);
-
- if (INTEL_GEN(dev_priv) < 11)
- ddb_size -= 4; /* 4 blocks for bypass path allocation */
+ ddb_size = intel_get_ddb_size(dev_priv, cstate, total_data_rate,
+ *num_active, ddb);
/*
* If the state doesn't change the active CRTC's, then there's
@@ -4239,7 +4269,11 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
return 0;
}
- skl_ddb_get_pipe_allocation_limits(dev, cstate, alloc, &num_active);
+ total_data_rate = skl_get_total_relative_data_rate(cstate,
+ plane_data_rate,
+ plane_y_data_rate);
+ skl_ddb_get_pipe_allocation_limits(dev, cstate, total_data_rate, ddb,
+ alloc, &num_active);
alloc_size = skl_ddb_entry_size(alloc);
if (alloc_size == 0)
return 0;
@@ -4274,9 +4308,6 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
*
* FIXME: we may not allocate every single block here.
*/
- total_data_rate = skl_get_total_relative_data_rate(cstate,
- plane_data_rate,
- plane_y_data_rate);
if (total_data_rate == 0)
return 0;
@@ -5382,8 +5413,12 @@ void skl_wm_get_hw_state(struct drm_device *dev)
/* Fully recompute DDB on first atomic commit */
dev_priv->wm.distrust_bios_wm = true;
} else {
- /* Easy/common case; just sanitize DDB now if everything off */
- memset(ddb, 0, sizeof(*ddb));
+ /*
+ * Easy/common case; just sanitize DDB now if everything off
+ * Keep dbuf slice info intact
+ */
+ memset(ddb->plane, 0, sizeof(ddb->plane));
+ memset(ddb->y_plane, 0, sizeof(ddb->y_plane));
}
}
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 58be542d660b..56cdec06e6b2 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2627,32 +2627,69 @@ static void intel_power_domains_sync_hw(struct drm_i915_private *dev_priv)
mutex_unlock(&power_domains->lock);
}
-static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
+static inline
+bool intel_dbuf_slice_set(struct drm_i915_private *dev_priv,
+ i915_reg_t reg, bool enable)
{
- I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) | DBUF_POWER_REQUEST);
- POSTING_READ(DBUF_CTL);
+ u32 val, status;
+ val = I915_READ(reg);
+ val = enable ? (val | DBUF_POWER_REQUEST) : (val & ~DBUF_POWER_REQUEST);
+ I915_WRITE(reg, val);
+ POSTING_READ(reg);
udelay(10);
- if (!(I915_READ(DBUF_CTL) & DBUF_POWER_STATE))
- DRM_ERROR("DBuf power enable timeout\n");
+ status = I915_READ(reg) & DBUF_POWER_STATE;
+ if ((enable && !status) || (!enable && status)) {
+ DRM_ERROR("DBus power %s timeout!\n",
+ enable ? "enable" : "disable");
+ return false;
+ }
+ return true;
+}
+
+static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
+{
+ intel_dbuf_slice_set(dev_priv, DBUF_CTL, true);
}
static void gen9_dbuf_disable(struct drm_i915_private *dev_priv)
{
- I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) & ~DBUF_POWER_REQUEST);
- POSTING_READ(DBUF_CTL);
+ intel_dbuf_slice_set(dev_priv, DBUF_CTL, false);
+}
- udelay(10);
+static uint8_t intel_dbuf_max_slices(struct drm_i915_private *dev_priv)
+{
+ if (INTEL_GEN(dev_priv) < 11)
+ return 1;
+ return 2;
+}
- if (I915_READ(DBUF_CTL) & DBUF_POWER_STATE)
- DRM_ERROR("DBuf power disable timeout!\n");
+void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
+ uint8_t req_slices)
+{
+ uint8_t hw_enabled_slices = dev_priv->wm.skl_hw.ddb.enabled_slices;
+ u32 val;
+ bool ret;
+
+ if (req_slices > intel_dbuf_max_slices(dev_priv)) {
+ DRM_ERROR("Invalid number of dbuf slices requested\n");
+ return;
+ }
+
+ if (req_slices == hw_enabled_slices || req_slices == 0)
+ return;
+
+ val = I915_READ(DBUF_CTL_S2);
+ if (req_slices > hw_enabled_slices)
+ ret = intel_dbuf_slice_set(dev_priv, DBUF_CTL_S2, true);
+ else
+ ret = intel_dbuf_slice_set(dev_priv, DBUF_CTL_S2, false);
+
+ if (ret)
+ dev_priv->wm.skl_hw.ddb.enabled_slices = req_slices;
}
-/*
- * TODO: we shouldn't always enable DBUF_CTL_S2, we should only enable it when
- * needed and keep it disabled as much as possible.
- */
static void icl_dbuf_enable(struct drm_i915_private *dev_priv)
{
I915_WRITE(DBUF_CTL_S1, I915_READ(DBUF_CTL_S1) | DBUF_POWER_REQUEST);
--
2.16.2
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