[Intel-gfx] [PATCH v6 3/4] drm/i915: Manipulate DBuf slices properly
Stanislav Lisovskiy
stanislav.lisovskiy at intel.com
Wed Nov 27 14:41:27 UTC 2019
Start manipulating DBuf slices as a mask,
but not as a total number, as current approach
doesn't give us full control on all combinations
of slices, which we might need(like enabling S2
only can't enabled by setting enabled_slices=1).
Removed wrong code from intel_get_ddb_size as
it doesn't match to BSpec. For now still just
use DBuf slice until proper algorithm is implemented.
Other minor code refactoring to get prepared
for major DBuf assignment changes landed:
- As now enabled slices contain a mask
we still need some value which should
reflect how much DBuf slices are supported
by the platform, now device info contains
num_supported_dbuf_slices.
- Removed unneeded assertion as we are now
manipulating slices in a more proper way.
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
---
drivers/gpu/drm/i915/display/intel_display.c | 7 +-
.../drm/i915/display/intel_display_power.c | 100 ++++++++----------
.../drm/i915/display/intel_display_power.h | 5 +
drivers/gpu/drm/i915/i915_pci.c | 6 +-
drivers/gpu/drm/i915/intel_device_info.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 43 +++-----
6 files changed, 72 insertions(+), 90 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 0d53bf82b2df..134d20992671 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -13419,7 +13419,7 @@ static void verify_wm_state(struct intel_crtc *crtc,
if (INTEL_GEN(dev_priv) >= 11 &&
hw->ddb.enabled_slices != sw_ddb->enabled_slices)
- DRM_ERROR("mismatch in DBUF Slices (expected %u, got %u)\n",
+ DRM_ERROR("mismatch in DBUF Slices (expected %x, got %x)\n",
sw_ddb->enabled_slices,
hw->ddb.enabled_slices);
@@ -14644,10 +14644,11 @@ static void icl_dbuf_slice_pre_update(struct intel_atomic_state *state)
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
u8 hw_enabled_slices = dev_priv->wm.skl_hw.enabled_slices;
u8 required_slices = state->wm_results.enabled_slices;
+ u8 slices_union = hw_enabled_slices | required_slices;
/* 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);
+ icl_dbuf_slices_update(dev_priv, slices_union);
}
static void icl_dbuf_slice_post_update(struct intel_atomic_state *state)
@@ -14669,8 +14670,6 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
unsigned int updated = 0;
bool progress;
int i;
- u8 hw_enabled_slices = dev_priv->wm.skl_hw.enabled_slices;
- u8 required_slices = state->wm_results.enabled_slices;
struct skl_ddb_entry entries[I915_MAX_PIPES] = {};
for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i)
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 75198da13479..340fc2d3147d 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -1031,15 +1031,6 @@ static bool gen9_dc_off_power_well_enabled(struct drm_i915_private *dev_priv,
(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)
-{
- u32 tmp = I915_READ(DBUF_CTL);
-
- WARN((tmp & (DBUF_POWER_STATE | DBUF_POWER_REQUEST)) !=
- (DBUF_POWER_STATE | DBUF_POWER_REQUEST),
- "Unexpected DBuf power power state (0x%08x)\n", tmp);
-}
-
static void gen9_disable_dc_states(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state = {};
@@ -1055,8 +1046,6 @@ static void gen9_disable_dc_states(struct drm_i915_private *dev_priv)
/* 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);
-
if (IS_GEN9_LP(dev_priv))
bxt_verify_ddi_phy_power_wells(dev_priv);
@@ -4254,72 +4243,71 @@ static void gen9_dbuf_disable(struct drm_i915_private *dev_priv)
intel_dbuf_slice_set(dev_priv, DBUF_CTL, false);
}
-static u8 intel_dbuf_max_slices(struct drm_i915_private *dev_priv)
+int intel_dbuf_max_slices(struct drm_i915_private *dev_priv)
{
- if (INTEL_GEN(dev_priv) < 11)
- return 1;
- return 2;
+ return INTEL_INFO(dev_priv)->num_supported_dbuf_slices;
+}
+
+void icl_program_dbuf_slices(struct drm_i915_private *dev_priv)
+{
+ const u8 hw_enabled_slices = dev_priv->wm.skl_hw.enabled_slices;
+
+ icl_dbuf_slices_update(dev_priv, hw_enabled_slices);
}
void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
u8 req_slices)
{
- const u8 hw_enabled_slices = dev_priv->wm.skl_hw.enabled_slices;
- bool ret;
+ int i;
+ int max_slices = intel_dbuf_max_slices(dev_priv);
- if (req_slices > intel_dbuf_max_slices(dev_priv)) {
+ if (hweight8(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;
+ DRM_DEBUG_KMS("Updating dbuf slices to %x\n", req_slices);
- 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);
+ for (i = 0; i < max_slices; i++) {
+ int slice_bit = BIT(i);
+ bool slice_set = (slice_bit & req_slices) != 0;
+
+ switch (slice_bit) {
+ case DBUF_S1_BIT:
+ intel_dbuf_slice_set(dev_priv,
+ DBUF_CTL_S1,
+ slice_set);
+ break;
+ case DBUF_S2_BIT:
+ intel_dbuf_slice_set(dev_priv,
+ DBUF_CTL_S2,
+ slice_set);
+ break;
+ default:
+ MISSING_CASE(slice_bit);
+ }
+ }
- if (ret)
- dev_priv->wm.skl_hw.enabled_slices = req_slices;
+ dev_priv->wm.skl_hw.enabled_slices = req_slices;
}
static void icl_dbuf_enable(struct drm_i915_private *dev_priv)
{
- I915_WRITE(DBUF_CTL_S1, I915_READ(DBUF_CTL_S1) | DBUF_POWER_REQUEST);
- I915_WRITE(DBUF_CTL_S2, I915_READ(DBUF_CTL_S2) | DBUF_POWER_REQUEST);
- POSTING_READ(DBUF_CTL_S2);
-
- udelay(10);
-
- 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
- /*
- * FIXME: for now pretend that we only have 1 slice, see
- * intel_enabled_dbuf_slices_num().
- */
- dev_priv->wm.skl_hw.enabled_slices = 1;
+ /*
+ * Just power up 1 slice, we will
+ * figure out later which slices we have and what we need.
+ */
+ dev_priv->wm.skl_hw.enabled_slices = DBUF_S1_BIT;
+ icl_program_dbuf_slices(dev_priv);
}
static void icl_dbuf_disable(struct drm_i915_private *dev_priv)
{
- I915_WRITE(DBUF_CTL_S1, I915_READ(DBUF_CTL_S1) & ~DBUF_POWER_REQUEST);
- I915_WRITE(DBUF_CTL_S2, I915_READ(DBUF_CTL_S2) & ~DBUF_POWER_REQUEST);
- POSTING_READ(DBUF_CTL_S2);
-
- udelay(10);
-
- 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
- /*
- * FIXME: for now pretend that the first slice is always
- * enabled, see intel_enabled_dbuf_slices_num().
- */
- dev_priv->wm.skl_hw.enabled_slices = 1;
+ /*
+ * Disable all slices
+ */
+ dev_priv->wm.skl_hw.enabled_slices = 0;
+ icl_program_dbuf_slices(dev_priv);
}
static void icl_mbus_init(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h b/drivers/gpu/drm/i915/display/intel_display_power.h
index 1da04f3e0fb3..0d9f87607eac 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.h
+++ b/drivers/gpu/drm/i915/display/intel_display_power.h
@@ -311,8 +311,13 @@ intel_display_power_put_async(struct drm_i915_private *i915,
for ((wf) = intel_display_power_get((i915), (domain)); (wf); \
intel_display_power_put_async((i915), (domain), (wf)), (wf) = 0)
+#define DBUF_S1_BIT BIT(0)
+#define DBUF_S2_BIT BIT(1)
+
void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
u8 req_slices);
+void icl_program_dbuf_slices(struct drm_i915_private *dev_priv);
+int intel_dbuf_max_slices(struct drm_i915_private *dev_priv);
void chv_phy_powergate_lanes(struct intel_encoder *encoder,
bool override, unsigned int mask);
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index da3e9b5752ac..a050222240e4 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -614,7 +614,8 @@ static const struct intel_device_info intel_cherryview_info = {
.has_gt_uc = 1, \
.display.has_hdcp = 1, \
.display.has_ipc = 1, \
- .ddb_size = 896
+ .ddb_size = 896, \
+ .num_supported_dbuf_slices = 1
#define SKL_PLATFORM \
GEN9_FEATURES, \
@@ -649,6 +650,7 @@ static const struct intel_device_info intel_skylake_gt4_info = {
#define GEN9_LP_FEATURES \
GEN(9), \
.is_lp = 1, \
+ .num_supported_dbuf_slices = 1, \
.display.has_hotplug = 1, \
.engine_mask = BIT(RCS0) | BIT(VCS0) | BIT(BCS0) | BIT(VECS0), \
.pipe_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C), \
@@ -737,6 +739,7 @@ static const struct intel_device_info intel_coffeelake_gt3_info = {
GEN9_FEATURES, \
GEN(10), \
.ddb_size = 1024, \
+ .num_supported_dbuf_slices = 1, \
.display.has_dsc = 1, \
.has_coherent_ggtt = false, \
GLK_COLORS
@@ -773,6 +776,7 @@ static const struct intel_device_info intel_cannonlake_info = {
}, \
GEN(11), \
.ddb_size = 2048, \
+ .num_supported_dbuf_slices = 2, \
.has_logical_ring_elsq = 1, \
.color = { .degamma_lut_size = 33, .gamma_lut_size = 262145 }
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index 4bdf8a6cfb47..4a9f54a900be 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -180,6 +180,7 @@ struct intel_device_info {
} display;
u16 ddb_size; /* in blocks */
+ u8 num_supported_dbuf_slices; /* number of DBuf slices */
/* Register offsets for the various display pipes and transcoders */
int pipe_offsets[I915_MAX_TRANSCODERS];
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3857ec3d2bd6..4c30dddb943a 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3601,22 +3601,18 @@ bool ilk_disable_lp_wm(struct drm_device *dev)
static u8 intel_enabled_dbuf_slices_num(struct drm_i915_private *dev_priv)
{
- u8 enabled_slices;
-
- /* Slice 1 will always be enabled */
- enabled_slices = 1;
+ u8 enabled_slices = 0;
/* Gen prior to GEN11 have only one DBuf slice */
if (INTEL_GEN(dev_priv) < 11)
- return enabled_slices;
+ return DBUF_S1_BIT;
- /*
- * FIXME: for now we'll only ever use 1 slice; pretend that we have
- * only that 1 slice enabled until we have a proper way for on-demand
- * toggling of the second slice.
- */
- if (0 && I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE)
- enabled_slices++;
+ /* Check if second DBuf slice is enabled */
+ if (I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE)
+ enabled_slices |= DBUF_S1_BIT;
+
+ if (I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE)
+ enabled_slices |= DBUF_S2_BIT;
return enabled_slices;
}
@@ -3825,8 +3821,6 @@ static u16 intel_get_ddb_size(struct drm_i915_private *dev_priv,
const int num_active,
struct skl_ddb_values *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);
@@ -3834,23 +3828,14 @@ static u16 intel_get_ddb_size(struct drm_i915_private *dev_priv,
if (INTEL_GEN(dev_priv) < 11)
return ddb_size - 4; /* 4 blocks for bypass path allocation */
- adjusted_mode = &crtc_state->hw.adjusted_mode;
- total_data_bw = total_data_rate * drm_mode_vrefresh(adjusted_mode);
-
/*
- * 12GB/s is maximum BW supported by single DBuf slice.
- *
- * FIXME dbuf slice code is broken:
- * - must wait for planes to stop using the slice before powering it off
- * - plane straddling both slices is illegal in multi-pipe scenarios
- * - should validate we stay within the hw bandwidth limits
+ * FIXME: Enabled slices should be only
+ * in according to BSpec and be determined
+ * by num active pipes(BSpec 12716 and 49255).
+ * For now set mask for 1st slice only.
*/
- if (0 && (num_active > 1 || total_data_bw >= GBps(12))) {
- ddb->enabled_slices = 2;
- } else {
- ddb->enabled_slices = 1;
- ddb_size /= 2;
- }
+ ddb->enabled_slices = DBUF_S1_BIT;
+ ddb_size /= 2;
return ddb_size;
}
--
2.17.1
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