drm/i915: Pass crtc_state->dpll directly to ->find_dpll()

When calculating clocks, just pass a pointer to crtc_state->dpll
directly to the find_dpll() hook. Back when this was introduced in
commit f47709a9502f3 ("drm/i915: create pipe_config->dpll for clock
state") there was no staged crtc config or atomic crtc state, so it was
possible to overwrite the current configuration on error. That hasn't
been the case for a while now, so finally make it "disappear".

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458576016-30348-10-git-send-email-ander.conselvan.de.oliveira@intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -7816,7 +7816,6 @@ static int i9xx_crtc_compute_clock(struct intel_crtc *crtc,
 	struct drm_device *dev = crtc->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int refclk;
-	intel_clock_t clock;
 	bool ok;
 	const intel_limit_t *limit;
 
@@ -7838,18 +7837,12 @@ static int i9xx_crtc_compute_clock(struct intel_crtc *crtc,
 		limit = intel_limit(crtc_state, refclk);
 		ok = dev_priv->display.find_dpll(limit, crtc_state,
 						 crtc_state->port_clock,
-						 refclk, NULL, &clock);
+						 refclk, NULL,
+						 &crtc_state->dpll);
 		if (!ok) {
 			DRM_ERROR("Couldn't find PLL settings for mode!\n");
 			return -EINVAL;
 		}
-
-		/* Compat-code for transition, will disappear. */
-		crtc_state->dpll.n = clock.n;
-		crtc_state->dpll.m1 = clock.m1;
-		crtc_state->dpll.m2 = clock.m2;
-		crtc_state->dpll.p1 = clock.p1;
-		crtc_state->dpll.p2 = clock.p2;
 	}
 
 	if (IS_GEN2(dev)) {
@@ -8797,7 +8790,7 @@ static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
 static int ironlake_crtc_compute_clock(struct intel_crtc *crtc,
 				       struct intel_crtc_state *crtc_state)
 {
-	intel_clock_t clock, reduced_clock;
+	intel_clock_t reduced_clock;
 	u32 dpll = 0, fp = 0, fp2 = 0;
 	bool has_reduced_clock = false;
 	struct intel_shared_dpll *pll;
@@ -8811,20 +8804,13 @@ static int ironlake_crtc_compute_clock(struct intel_crtc *crtc,
 	if (!crtc_state->has_pch_encoder)
 		return 0;
 
-	if (!crtc_state->clock_set) {
-		if (!ironlake_compute_clocks(&crtc->base, crtc_state, &clock,
-					     &has_reduced_clock,
-					     &reduced_clock)) {
-			DRM_ERROR("Couldn't find PLL settings for mode!\n");
-			return -EINVAL;
-		}
-
-		/* Compat-code for transition, will disappear. */
-		crtc_state->dpll.n = clock.n;
-		crtc_state->dpll.m1 = clock.m1;
-		crtc_state->dpll.m2 = clock.m2;
-		crtc_state->dpll.p1 = clock.p1;
-		crtc_state->dpll.p2 = clock.p2;
+	if (!crtc_state->clock_set &&
+	    !ironlake_compute_clocks(&crtc->base, crtc_state,
+				     &crtc_state->dpll,
+				     &has_reduced_clock,
+				     &reduced_clock)) {
+		DRM_ERROR("Couldn't find PLL settings for mode!\n");
+		return -EINVAL;
 	}
 
 	fp = i9xx_dpll_compute_fp(&crtc_state->dpll);