[Intel-gfx] [PATCH v27 2/6] drm/i915: Separate icl and skl SAGV checking

[Stanislav Lisovskiy]

Introduce platform dependent SAGV checking in
combination with bandwidth state pipe SAGV mask.

v2, v3, v4, v5, v6: Fix rebase conflict

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index da567fac7c93..c7d726a656b2 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3853,6 +3853,24 @@ static bool intel_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state
 	return true;
 }
 
+static bool skl_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(crtc_state->uapi.state);
+	/*
+	 * SKL+ workaround: bspec recommends we disable SAGV when we have
+	 * more then one pipe enabled
+	 */
+	if (hweight8(state->active_pipes) > 1)
+		return false;
+
+	return intel_crtc_can_enable_sagv(crtc_state);
+}
+
+static bool icl_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state)
+{
+	return intel_crtc_can_enable_sagv(crtc_state);
+}
+
 bool intel_can_enable_sagv(const struct intel_bw_state *bw_state)
 {
 	if (bw_state->active_pipes && !is_power_of_2(bw_state->active_pipes))
@@ -3863,22 +3881,30 @@ bool intel_can_enable_sagv(const struct intel_bw_state *bw_state)
 
 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;
-	struct intel_crtc_state *new_crtc_state;
+	const 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;
 
 	for_each_new_intel_crtc_in_state(state, crtc,
 					 new_crtc_state, i) {
+		bool can_sagv;
+
 		new_bw_state = intel_atomic_get_bw_state(state);
 		if (IS_ERR(new_bw_state))
 			return PTR_ERR(new_bw_state);
 
 		old_bw_state = intel_atomic_get_old_bw_state(state);
 
-		if (intel_crtc_can_enable_sagv(new_crtc_state))
+		if (INTEL_GEN(dev_priv) >= 11)
+			can_sagv = icl_crtc_can_enable_sagv(new_crtc_state);
+		else
+			can_sagv = skl_crtc_can_enable_sagv(new_crtc_state);
+
+		if (can_sagv)
 			new_bw_state->pipe_sagv_reject &= ~BIT(crtc->pipe);
 		else
 			new_bw_state->pipe_sagv_reject |= BIT(crtc->pipe);
-- 
2.24.1.485.gad05a3d8e5