drm/i915: Stop using mode->private_flags

Replace the use of mode->private_flags with a truly private bitmaks
in our own crtc state. We also need a copy in the crtc itself so the
vblank code can get at it. We already have scanline_offset in there
for a similar reason, as well as the vblank->hwmode which is assigned
via drm_calc_timestamping_constants(). Fortunately we now have a
nice place for doing the crtc_state->crtc copy in
intel_crtc_update_active_timings() which gets called both for
modesets and init/resume readout.

The one slightly iffy spot is the INHERITED flag which we want to
preserve until userspace/fb_helper does the first proper commit after
actually calling .detecti() on the connectors. Otherwise we don't have
the full sink capabilities (audio,infoframes,etc.) when .compute_config()
gets called and thus we will fail to enable those features when the
first userspace commit happens. The only internal commit we do prior to
that should be from intel_initial_commit() and there we can simply
preserve the INHERITED flag from the readout.

v2: Deal with INHERITED in sanitize_watermarks() as well

CC: Sam Ravnborg <sam@ravnborg.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200429103904.11727-1-ville.syrjala@linux.intel.com

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

@@ -1469,8 +1469,7 @@ static void gen11_dsi_get_config(struct intel_encoder *encoder,
 	pipe_config->pipe_bpp = bdw_get_pipemisc_bpp(crtc);
 
 	if (gen11_dsi_is_periodic_cmd_mode(intel_dsi))
-		pipe_config->hw.adjusted_mode.private_flags |=
-					I915_MODE_FLAG_DSI_PERIODIC_CMD_MODE;
+		pipe_config->mode_flags |= I915_MODE_FLAG_DSI_PERIODIC_CMD_MODE;
 }
 
 static int gen11_dsi_dsc_compute_config(struct intel_encoder *encoder,
@@ -1558,10 +1557,6 @@ static int gen11_dsi_compute_config(struct intel_encoder *encoder,
 
 	pipe_config->port_clock = afe_clk(encoder, pipe_config) / 5;
 
-	/* We would not operate in periodic command mode */
-	pipe_config->hw.adjusted_mode.private_flags &=
-					~I915_MODE_FLAG_DSI_PERIODIC_CMD_MODE;
-
 	/*
 	 * In case of TE GATE cmd mode, we
 	 * receive TE from the slave if
@@ -1569,14 +1564,14 @@ static int gen11_dsi_compute_config(struct intel_encoder *encoder,
 	 */
 	if (is_cmd_mode(intel_dsi)) {
 		if (intel_dsi->ports == (BIT(PORT_B) | BIT(PORT_A)))
-			pipe_config->hw.adjusted_mode.private_flags |=
+			pipe_config->mode_flags |=
 						I915_MODE_FLAG_DSI_USE_TE1 |
 						I915_MODE_FLAG_DSI_USE_TE0;
 		else if (intel_dsi->ports == BIT(PORT_B))
-			pipe_config->hw.adjusted_mode.private_flags |=
+			pipe_config->mode_flags |=
 						I915_MODE_FLAG_DSI_USE_TE1;
 		else
-			pipe_config->hw.adjusted_mode.private_flags |=
+			pipe_config->mode_flags |=
 						I915_MODE_FLAG_DSI_USE_TE0;
 	}
 

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

@@ -253,6 +253,7 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
 	crtc_state->fb_bits = 0;
 	crtc_state->update_planes = 0;
 	crtc_state->dsb = NULL;
+	crtc_state->mode_flags &= ~I915_MODE_FLAG_INHERITED;
 
 	return &crtc_state->uapi;
 }

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

@@ -6425,7 +6425,7 @@ static bool hsw_post_update_enable_ips(const struct intel_crtc_state *old_crtc_s
 	 * forcibly enable IPS on the first fastset.
 	 */
 	if (new_crtc_state->update_pipe &&
-	    old_crtc_state->hw.adjusted_mode.private_flags & I915_MODE_FLAG_INHERITED)
+	    old_crtc_state->mode_flags & I915_MODE_FLAG_INHERITED)
 		return true;
 
 	return !old_crtc_state->ips_enabled;
@@ -13605,8 +13605,8 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 	bool ret = true;
 	u32 bp_gamma = 0;
 	bool fixup_inherited = fastset &&
-		(current_config->hw.mode.private_flags & I915_MODE_FLAG_INHERITED) &&
-		!(pipe_config->hw.mode.private_flags & I915_MODE_FLAG_INHERITED);
+		(current_config->mode_flags & I915_MODE_FLAG_INHERITED) &&
+		!(pipe_config->mode_flags & I915_MODE_FLAG_INHERITED);
 
 	if (fixup_inherited && !fastboot_enabled(dev_priv)) {
 		drm_dbg_kms(&dev_priv->drm,
@@ -14414,6 +14414,8 @@ intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state)
 
 	drm_calc_timestamping_constants(&crtc->base, adjusted_mode);
 
+	crtc->mode_flags = crtc_state->mode_flags;
+
 	/*
 	 * The scanline counter increments at the leading edge of hsync.
 	 *
@@ -14814,8 +14816,7 @@ static int intel_atomic_check(struct drm_device *dev,
 	/* Catch I915_MODE_FLAG_INHERITED */
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 					    new_crtc_state, i) {
-		if (new_crtc_state->uapi.mode.private_flags !=
-		    old_crtc_state->uapi.mode.private_flags)
+		if (new_crtc_state->mode_flags != old_crtc_state->mode_flags)
 			new_crtc_state->uapi.mode_changed = true;
 	}
 
@@ -15185,7 +15186,7 @@ static void intel_update_crtc(struct intel_atomic_state *state,
 	 * of enabling them on the CRTC's first fastset.
 	 */
 	if (new_crtc_state->update_pipe && !modeset &&
-	    old_crtc_state->hw.mode.private_flags & I915_MODE_FLAG_INHERITED)
+	    old_crtc_state->mode_flags & I915_MODE_FLAG_INHERITED)
 		intel_crtc_arm_fifo_underrun(crtc, new_crtc_state);
 }
 
@@ -17505,14 +17506,22 @@ void intel_modeset_init_hw(struct drm_i915_private *i915)
 static int sanitize_watermarks_add_affected(struct drm_atomic_state *state)
 {
 	struct drm_plane *plane;
-	struct drm_crtc *crtc;
+	struct intel_crtc *crtc;
 
-	drm_for_each_crtc(crtc, state->dev) {
-		struct drm_crtc_state *crtc_state;
+	for_each_intel_crtc(state->dev, crtc) {
+		struct intel_crtc_state *crtc_state;
 
-		crtc_state = drm_atomic_get_crtc_state(state, crtc);
+		crtc_state = intel_atomic_get_crtc_state(state, crtc);
 		if (IS_ERR(crtc_state))
 			return PTR_ERR(crtc_state);
+
+		if (crtc_state->hw.active) {
+			/*
+			 * Preserve the inherited flag to avoid
+			 * taking the full modeset path.
+			 */
+			crtc_state->mode_flags |= I915_MODE_FLAG_INHERITED;
+		}
 	}
 
 	drm_for_each_plane(plane, state->dev) {
@@ -17654,6 +17663,15 @@ static int intel_initial_commit(struct drm_device *dev)
 		}
 
 		if (crtc_state->hw.active) {
+			/*
+			 * We've not yet detected sink capabilities
+			 * (audio,infoframes,etc.) and thus we don't want to
+			 * force a full state recomputation yet. We want that to
+			 * happen only for the first real commit from userspace.
+			 * So preserve the inherited flag for the time being.
+			 */
+			crtc_state->mode_flags |= I915_MODE_FLAG_INHERITED;
+
 			ret = drm_atomic_add_affected_planes(state, &crtc->base);
 			if (ret)
 				goto out;
@@ -18432,7 +18450,7 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 			 * set a flag to indicate that a full recalculation is
 			 * needed on the next commit.
 			 */
-			mode->private_flags = I915_MODE_FLAG_INHERITED;
+			crtc_state->mode_flags |= I915_MODE_FLAG_INHERITED;
 
 			intel_crtc_compute_pixel_rate(crtc_state);
 

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -630,7 +630,7 @@ struct intel_crtc_scaler_state {
 	int scaler_id;
 };
 
-/* drm_mode->private_flags */
+/* {crtc,crtc_state}->mode_flags */
 #define I915_MODE_FLAG_INHERITED (1<<0)
 /* Flag to get scanline using frame time stamps */
 #define I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP (1<<1)
@@ -943,6 +943,9 @@ struct intel_crtc_state {
 	/* Used by SDVO (and if we ever fix it, HDMI). */
 	unsigned pixel_multiplier;
 
+	/* I915_MODE_FLAG_* */
+	u8 mode_flags;
+
 	u8 lane_count;
 
 	/*
@@ -1108,6 +1111,10 @@ struct intel_crtc {
 	 */
 	bool active;
 	u8 plane_ids_mask;
+
+	/* I915_MODE_FLAG_* */
+	u8 mode_flags;
+
 	unsigned long long enabled_power_domains;
 	struct intel_overlay *overlay;
 

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

@@ -1161,7 +1161,7 @@ intel_tv_get_config(struct intel_encoder *encoder,
 
 	/* pixel counter doesn't work on i965gm TV output */
 	if (IS_I965GM(dev_priv))
-		adjusted_mode->private_flags |=
+		pipe_config->mode_flags |=
 			I915_MODE_FLAG_USE_SCANLINE_COUNTER;
 }
 
@@ -1331,7 +1331,7 @@ intel_tv_compute_config(struct intel_encoder *encoder,
 
 	/* pixel counter doesn't work on i965gm TV output */
 	if (IS_I965GM(dev_priv))
-		adjusted_mode->private_flags |=
+		pipe_config->mode_flags |=
 			I915_MODE_FLAG_USE_SCANLINE_COUNTER;
 
 	return 0;

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

@@ -298,7 +298,7 @@ static int intel_dsi_compute_config(struct intel_encoder *encoder,
 
 	if (IS_GEN9_LP(dev_priv)) {
 		/* Enable Frame time stamp based scanline reporting */
-		adjusted_mode->private_flags |=
+		pipe_config->mode_flags |=
 			I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
 
 		/* Dual link goes to DSI transcoder A. */
@@ -1097,7 +1097,7 @@ static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
 	pipe_config->pipe_bpp = bdw_get_pipemisc_bpp(crtc);
 
 	/* Enable Frame time stamo based scanline reporting */
-	adjusted_mode->private_flags |=
+	pipe_config->mode_flags |=
 		I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
 
 	/* In terms of pixels */

drivers/gpu/drm/i915/i915_irq.c

@@ -777,7 +777,7 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
 	vblank = &crtc->base.dev->vblank[drm_crtc_index(&crtc->base)];
 	mode = &vblank->hwmode;
 
-	if (mode->private_flags & I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP)
+	if (crtc->mode_flags & I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP)
 		return __intel_get_crtc_scanline_from_timestamp(crtc);
 
 	vtotal = mode->crtc_vtotal;
@@ -836,7 +836,7 @@ static bool i915_get_crtc_scanoutpos(struct drm_crtc *_crtc,
 	unsigned long irqflags;
 	bool use_scanline_counter = INTEL_GEN(dev_priv) >= 5 ||
 		IS_G4X(dev_priv) || IS_GEN(dev_priv, 2) ||
-		mode->private_flags & I915_MODE_FLAG_USE_SCANLINE_COUNTER;
+		crtc->mode_flags & I915_MODE_FLAG_USE_SCANLINE_COUNTER;
 
 	if (drm_WARN_ON(&dev_priv->drm, !mode->crtc_clock)) {
 		drm_dbg(&dev_priv->drm,