Revert "drm/radeon/kms: remove some pll algo flags"

This reverts commit f28488c2.

On my rv610 test machine the monitor failed to light up after this.
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/atombios_crtc.c

@@ -501,9 +501,21 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 		    (rdev->family == CHIP_RS740))
 			pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
 				       RADEON_PLL_PREFER_CLOSEST_LOWER);
-	} else
+
+		if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)	/* range limits??? */
+			pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
+		else
+			pll->flags |= RADEON_PLL_PREFER_LOW_REF_DIV;
+	} else {
 		pll->flags |= RADEON_PLL_LEGACY;
 
+		if (mode->clock > 200000)	/* range limits??? */
+			pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
+		else
+			pll->flags |= RADEON_PLL_PREFER_LOW_REF_DIV;
+
+	}
+
 	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 		if (encoder->crtc == crtc) {
 			radeon_encoder = to_radeon_encoder(encoder);

drivers/gpu/drm/radeon/radeon_display.c

@@ -611,8 +611,7 @@ void radeon_compute_pll(struct radeon_pll *pll,
 					if ((best_vco == 0 && error < best_error) ||
 					    (best_vco != 0 &&
 					     ((best_error > 100 && error < best_error - 100) ||
-					      (abs(error - best_error) < 100 &&
-					       vco_diff < best_vco_diff)))) {
+					      (abs(error - best_error) < 100 && vco_diff < best_vco_diff)))) {
 						best_post_div = post_div;
 						best_ref_div = ref_div;
 						best_feedback_div = feedback_div;
@@ -620,6 +619,29 @@ void radeon_compute_pll(struct radeon_pll *pll,
 						best_freq = current_freq;
 						best_error = error;
 						best_vco_diff = vco_diff;
+					} else if (current_freq == freq) {
+						if (best_freq == -1) {
+							best_post_div = post_div;
+							best_ref_div = ref_div;
+							best_feedback_div = feedback_div;
+							best_frac_feedback_div = frac_feedback_div;
+							best_freq = current_freq;
+							best_error = error;
+							best_vco_diff = vco_diff;
+						} else if (((pll->flags & RADEON_PLL_PREFER_LOW_REF_DIV) && (ref_div < best_ref_div)) ||
+							   ((pll->flags & RADEON_PLL_PREFER_HIGH_REF_DIV) && (ref_div > best_ref_div)) ||
+							   ((pll->flags & RADEON_PLL_PREFER_LOW_FB_DIV) && (feedback_div < best_feedback_div)) ||
+							   ((pll->flags & RADEON_PLL_PREFER_HIGH_FB_DIV) && (feedback_div > best_feedback_div)) ||
+							   ((pll->flags & RADEON_PLL_PREFER_LOW_POST_DIV) && (post_div < best_post_div)) ||
+							   ((pll->flags & RADEON_PLL_PREFER_HIGH_POST_DIV) && (post_div > best_post_div))) {
+							best_post_div = post_div;
+							best_ref_div = ref_div;
+							best_feedback_div = feedback_div;
+							best_frac_feedback_div = frac_feedback_div;
+							best_freq = current_freq;
+							best_error = error;
+							best_vco_diff = vco_diff;
+						}
 					}
 					if (current_freq < freq)
 						min_frac_feed_div = frac_feedback_div + 1;

drivers/gpu/drm/radeon/radeon_legacy_crtc.c

@@ -745,6 +745,11 @@ static void radeon_set_pll(struct drm_crtc *crtc, struct drm_display_mode *mode)
 
 	pll->flags = RADEON_PLL_LEGACY;
 
+	if (mode->clock > 200000) /* range limits??? */
+		pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
+	else
+		pll->flags |= RADEON_PLL_PREFER_LOW_REF_DIV;
+
 	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 		if (encoder->crtc == crtc) {
 			struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

drivers/gpu/drm/radeon/radeon_mode.h

@@ -139,10 +139,16 @@ struct radeon_tmds_pll {
 #define RADEON_PLL_NO_ODD_POST_DIV      (1 << 1)
 #define RADEON_PLL_USE_REF_DIV          (1 << 2)
 #define RADEON_PLL_LEGACY               (1 << 3)
-#define RADEON_PLL_USE_FRAC_FB_DIV      (1 << 4)
-#define RADEON_PLL_PREFER_CLOSEST_LOWER (1 << 5)
-#define RADEON_PLL_USE_POST_DIV         (1 << 6)
-#define RADEON_PLL_IS_LCD               (1 << 7)
+#define RADEON_PLL_PREFER_LOW_REF_DIV   (1 << 4)
+#define RADEON_PLL_PREFER_HIGH_REF_DIV  (1 << 5)
+#define RADEON_PLL_PREFER_LOW_FB_DIV    (1 << 6)
+#define RADEON_PLL_PREFER_HIGH_FB_DIV   (1 << 7)
+#define RADEON_PLL_PREFER_LOW_POST_DIV  (1 << 8)
+#define RADEON_PLL_PREFER_HIGH_POST_DIV (1 << 9)
+#define RADEON_PLL_USE_FRAC_FB_DIV      (1 << 10)
+#define RADEON_PLL_PREFER_CLOSEST_LOWER (1 << 11)
+#define RADEON_PLL_USE_POST_DIV         (1 << 12)
+#define RADEON_PLL_IS_LCD               (1 << 13)
 
 struct radeon_pll {
 	/* reference frequency */