Future platforms require per-crtc SAGV evaluation
and serializing global state when those are changed
from different commits.
v2: - Add has_sagv check to intel_crtc_can_enable_sagv
so that it sets bit in reject mask.
- Use bw_state in intel_pre/post_plane_enable_sagv
instead of atomic state
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxx>
Cc: James Ausmus <james.ausmus@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_bw.h | 6 ++
drivers/gpu/drm/i915/intel_pm.c | 98 ++++++++++++++++++++-----
drivers/gpu/drm/i915/intel_pm.h | 4 +-
3 files changed, 90 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_bw.h b/drivers/gpu/drm/i915/display/intel_bw.h
index ac004d6f4276..d6df91058223 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.h
+++ b/drivers/gpu/drm/i915/display/intel_bw.h
@@ -18,6 +18,12 @@ struct intel_crtc_state;
struct intel_bw_state {
struct intel_global_state base;
+ /*
+ * Contains a bit mask, used to determine, whether correspondent
+ * pipe allows SAGV or not.
+ */
+ u8 pipe_sagv_reject;
+
unsigned int data_rate[I915_MAX_PIPES];
u8 num_active_planes[I915_MAX_PIPES];
};
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 88637f006add..a3c8c0c7a503 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -43,6 +43,7 @@
#include "i915_fixed.h"
#include "i915_irq.h"
#include "i915_trace.h"
+#include "display/intel_bw.h"
#include "intel_pm.h"
#include "intel_sideband.h"
#include "../../../platform/x86/intel_ips.h"
@@ -3634,7 +3635,7 @@ static bool skl_needs_memory_bw_wa(struct drm_i915_private *dev_priv)
return IS_GEN9_BC(dev_priv) || IS_BROXTON(dev_priv);
}
-static bool
+bool
intel_has_sagv(struct drm_i915_private *dev_priv)
{
/* HACK! */
@@ -3760,8 +3761,23 @@ intel_disable_sagv(struct drm_i915_private *dev_priv)
void intel_sagv_pre_plane_update(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+ const struct intel_bw_state *new_bw_state = NULL;
- if (!intel_can_enable_sagv(state)) {
+ /*
+ * Just return if we can't control SAGV or don't have it.
+ * This is different from situation when we have SAGV but just can't
+ * afford it due to DBuf limitation - in case if SAGV is completely
+ * disabled in a BIOS, we are not even allowed to send a PCode request,
+ * as it will throw an error. So have to check it here.
+ */
+ if (!intel_has_sagv(dev_priv))
+ return;
+
+ new_bw_state = intel_atomic_get_new_bw_state(state);
+ if (!new_bw_state)
+ return;
+
+ if (!intel_can_enable_sagv(new_bw_state)) {
intel_disable_sagv(dev_priv);
return;
}
@@ -3770,8 +3786,23 @@ void intel_sagv_pre_plane_update(struct intel_atomic_state *state)
void intel_sagv_post_plane_update(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+ const struct intel_bw_state *new_bw_state = NULL;
- if (intel_can_enable_sagv(state)) {
+ /*
+ * Just return if we can't control SAGV or don't have it.
+ * This is different from situation when we have SAGV but just can't
+ * afford it due to DBuf limitation - in case if SAGV is completely
+ * disabled in a BIOS, we are not even allowed to send a PCode request,
+ * as it will throw an error. So have to check it here.
+ */
+ if (!intel_has_sagv(dev_priv))
+ return;
+
+ new_bw_state = intel_atomic_get_new_bw_state(state);
+ if (!new_bw_state)
+ return;
+
+ if (intel_can_enable_sagv(new_bw_state)) {
intel_enable_sagv(dev_priv);
return;
}
@@ -3779,15 +3810,26 @@ void intel_sagv_post_plane_update(struct intel_atomic_state *state)
static bool intel_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state)
{
+ struct intel_atomic_state *state = to_intel_atomic_state(crtc_state->uapi.state);
struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct intel_plane *plane;
const struct intel_plane_state *plane_state;
int level, latency;
+ if (!intel_has_sagv(dev_priv))
+ return false;
+
if (!crtc_state->hw.active)
return true;
+ /*
+ * SKL+ workaround: bspec recommends we disable SAGV when we have
+ * more then one pipe enabled
+ */
+ if (hweight8(state->active_pipes) > 1)
+ return false;
+
if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
DRM_DEBUG_KMS("No SAGV for interlaced mode on pipe %c\n",
pipe_name(crtc->pipe));
@@ -3826,29 +3868,47 @@ static bool intel_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state
return true;
}
-bool intel_can_enable_sagv(struct intel_atomic_state *state)
+bool intel_can_enable_sagv(const struct intel_bw_state *bw_state)
+{
+ return bw_state->pipe_sagv_reject == 0;
+}
+
+static int intel_compute_sagv_mask(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+ int ret;
struct intel_crtc *crtc;
const struct intel_crtc_state *crtc_state;
enum pipe pipe;
+ struct intel_crtc_state *new_crtc_state;
+ struct intel_bw_state *new_bw_state = NULL;
+ const struct intel_bw_state *old_bw_state = NULL;
+ int i;
- if (!intel_has_sagv(dev_priv))
- return false;
+ for_each_new_intel_crtc_in_state(state, crtc,
+ new_crtc_state, i) {
+ new_bw_state = intel_atomic_get_bw_state(state);
+ if (IS_ERR(new_bw_state))
+ return PTR_ERR(new_bw_state);
- /*
- * SKL+ workaround: bspec recommends we disable SAGV when we have
- * more then one pipe enabled
- */
- if (hweight8(state->active_pipes) > 1)
- return false;
+ old_bw_state = intel_atomic_get_old_bw_state(state);
- /* Since we're now guaranteed to only have one active CRTC... */
- pipe = ffs(state->active_pipes) - 1;
- crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
- crtc_state = to_intel_crtc_state(crtc->base.state);
+ if (intel_crtc_can_enable_sagv(new_crtc_state))
+ new_bw_state->pipe_sagv_reject &= ~BIT(crtc->pipe);
+ else
+ new_bw_state->pipe_sagv_reject |= BIT(crtc->pipe);
+ }
+
+ if (!old_bw_state)
+ return 0;
+
+ if (new_bw_state->pipe_sagv_reject != old_bw_state->pipe_sagv_reject) {
+ ret = intel_atomic_serialize_global_state(&new_bw_state->base);
+ if (ret)
+ return ret;
+ }
- return intel_crtc_can_enable_sagv(crtc_state);
+ return 0;
}
/*
@@ -5863,6 +5923,10 @@ skl_compute_wm(struct intel_atomic_state *state)
if (ret)
return ret;
+ ret = intel_compute_sagv_mask(state);
+ if (ret)
+ return ret;
+
/*
* skl_compute_ddb() will have adjusted the final watermarks
* based on how much ddb is available. Now we can actually
diff --git a/drivers/gpu/drm/i915/intel_pm.h b/drivers/gpu/drm/i915/intel_pm.h
index 9a6036ab0f90..abefc4205d0b 100644
--- a/drivers/gpu/drm/i915/intel_pm.h
+++ b/drivers/gpu/drm/i915/intel_pm.h
@@ -9,6 +9,7 @@
#include <linux/types.h>
#include "i915_reg.h"
+#include "display/intel_bw.h"
struct drm_device;
struct drm_i915_private;
@@ -41,7 +42,8 @@ void skl_pipe_wm_get_hw_state(struct intel_crtc *crtc,
struct skl_pipe_wm *out);
void g4x_wm_sanitize(struct drm_i915_private *dev_priv);
void vlv_wm_sanitize(struct drm_i915_private *dev_priv);
-bool intel_can_enable_sagv(struct intel_atomic_state *state);
+bool intel_has_sagv(struct drm_i915_private *dev_priv);
+bool intel_can_enable_sagv(const struct intel_bw_state *bw_state);
int intel_enable_sagv(struct drm_i915_private *dev_priv);
int intel_disable_sagv(struct drm_i915_private *dev_priv);
void intel_sagv_pre_plane_update(struct intel_atomic_state *state);
--
2.24.1.485.gad05a3d8e5
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