drm/i915/dmc: Also disable the flip queue event on TGL main DMC

Unlike later platforms TGL has its flip queue event (CLK_MSEC) on
the main DMC (as opposed to the pipe DMC). Currently we're doing
a second pass to disable that, but let's just follow the same
approach as the later platforms and never even enable the event
in the first place.

Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Imre Deak <[email protected]>

Author: vsyrjala

drivers/gpu/drm/i915/display/intel_dmc.c

@@ -335,77 +335,6 @@ static void disable_event_handler(struct drm_i915_private *i915,
 	intel_de_write(i915, htp_reg, 0);
 }
 
-static void
-disable_flip_queue_event(struct drm_i915_private *i915,
-			 i915_reg_t ctl_reg, i915_reg_t htp_reg)
-{
-	u32 event_ctl;
-	u32 event_htp;
-
-	event_ctl = intel_de_read(i915, ctl_reg);
-	event_htp = intel_de_read(i915, htp_reg);
-	if (event_ctl != (DMC_EVT_CTL_ENABLE |
-			  DMC_EVT_CTL_RECURRING |
-			  REG_FIELD_PREP(DMC_EVT_CTL_TYPE_MASK,
-					 DMC_EVT_CTL_TYPE_EDGE_0_1) |
-			  REG_FIELD_PREP(DMC_EVT_CTL_EVENT_ID_MASK,
-					 DMC_EVT_CTL_EVENT_ID_CLK_MSEC)) ||
-	    !event_htp) {
-		drm_dbg_kms(&i915->drm,
-			    "Unexpected DMC event configuration (control %08x htp %08x)\n",
-			    event_ctl, event_htp);
-		return;
-	}
-
-	disable_event_handler(i915, ctl_reg, htp_reg);
-}
-
-static bool
-get_flip_queue_event_regs(struct drm_i915_private *i915, enum intel_dmc_id dmc_id,
-			  i915_reg_t *ctl_reg, i915_reg_t *htp_reg)
-{
-	if (dmc_id == DMC_FW_MAIN) {
-		if (DISPLAY_VER(i915) == 12) {
-			*ctl_reg = DMC_EVT_CTL(i915, dmc_id, 3);
-			*htp_reg = DMC_EVT_HTP(i915, dmc_id, 3);
-
-			return true;
-		}
-	} else if (dmc_id >= DMC_FW_PIPEA && dmc_id <= DMC_FW_PIPED) {
-		if (IS_DG2(i915)) {
-			*ctl_reg = DMC_EVT_CTL(i915, dmc_id, 2);
-			*htp_reg = DMC_EVT_HTP(i915, dmc_id, 2);
-
-			return true;
-		}
-	}
-
-	return false;
-}
-
-static void
-disable_all_flip_queue_events(struct drm_i915_private *i915)
-{
-	enum intel_dmc_id dmc_id;
-
-	/* TODO: check if the following applies to all D13+ platforms. */
-	if (!IS_TIGERLAKE(i915))
-		return;
-
-	for_each_dmc_id(dmc_id) {
-		i915_reg_t ctl_reg;
-		i915_reg_t htp_reg;
-
-		if (!has_dmc_id_fw(i915, dmc_id))
-			continue;
-
-		if (!get_flip_queue_event_regs(i915, dmc_id, &ctl_reg, &htp_reg))
-			continue;
-
-		disable_flip_queue_event(i915, ctl_reg, htp_reg);
-	}
-}
-
 static void disable_all_event_handlers(struct drm_i915_private *i915)
 {
 	enum intel_dmc_id dmc_id;
@@ -514,6 +443,11 @@ static bool disable_dmc_evt(struct drm_i915_private *i915,
 	if (dmc_id != DMC_FW_MAIN)
 		return true;
 
+	/* also disable the flip queue event on the main DMC on TGL */
+	if (IS_TIGERLAKE(i915) &&
+	    REG_FIELD_GET(DMC_EVT_CTL_EVENT_ID_MASK, data) == DMC_EVT_CTL_EVENT_ID_CLK_MSEC)
+		return true;
+
 	return false;
 }
 
@@ -579,13 +513,6 @@ void intel_dmc_load_program(struct drm_i915_private *i915)
 
 	gen9_set_dc_state_debugmask(i915);
 
-	/*
-	 * Flip queue events need to be disabled before enabling DC5/6.
-	 * i915 doesn't use the flip queue feature, so disable it already
-	 * here.
-	 */
-	disable_all_flip_queue_events(i915);
-
 	pipedmc_clock_gating_wa(i915, false);
 }