drm/i915: Return more precise cdclk for gen2/3

Fill out the lower three digits for gen2 and gen3 cdclk frqeuncy. It's
not clear if these are accurate frquencies or just in the ballpark, but
without docs this is the best we can do.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -5893,7 +5893,7 @@ static int i945_get_display_clock_speed(struct drm_device *dev)
 
 static int i915_get_display_clock_speed(struct drm_device *dev)
 {
-	return 333000;
+	return 333333;
 }
 
 static int i9xx_misc_get_display_clock_speed(struct drm_device *dev)
@@ -5909,19 +5909,19 @@ static int pnv_get_display_clock_speed(struct drm_device *dev)
 
 	switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
 	case GC_DISPLAY_CLOCK_267_MHZ_PNV:
-		return 267000;
+		return 266667;
 	case GC_DISPLAY_CLOCK_333_MHZ_PNV:
-		return 333000;
+		return 333333;
 	case GC_DISPLAY_CLOCK_444_MHZ_PNV:
-		return 444000;
+		return 444444;
 	case GC_DISPLAY_CLOCK_200_MHZ_PNV:
 		return 200000;
 	default:
 		DRM_ERROR("Unknown pnv display core clock 0x%04x\n", gcfgc);
 	case GC_DISPLAY_CLOCK_133_MHZ_PNV:
-		return 133000;
+		return 133333;
 	case GC_DISPLAY_CLOCK_167_MHZ_PNV:
-		return 167000;
+		return 166667;
 	}
 }
 
@@ -5932,11 +5932,11 @@ static int i915gm_get_display_clock_speed(struct drm_device *dev)
 	pci_read_config_word(dev->pdev, GCFGC, &gcfgc);
 
 	if (gcfgc & GC_LOW_FREQUENCY_ENABLE)
-		return 133000;
+		return 133333;
 	else {
 		switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
 		case GC_DISPLAY_CLOCK_333_MHZ:
-			return 333000;
+			return 333333;
 		default:
 		case GC_DISPLAY_CLOCK_190_200_MHZ:
 			return 190000;
@@ -5946,7 +5946,7 @@ static int i915gm_get_display_clock_speed(struct drm_device *dev)
 
 static int i865_get_display_clock_speed(struct drm_device *dev)
 {
-	return 266000;
+	return 266667;
 }
 
 static int i855_get_display_clock_speed(struct drm_device *dev)
@@ -5962,7 +5962,7 @@ static int i855_get_display_clock_speed(struct drm_device *dev)
 	case GC_CLOCK_166_250:
 		return 250000;
 	case GC_CLOCK_100_133:
-		return 133000;
+		return 133333;
 	}
 
 	/* Shouldn't happen */
@@ -5971,7 +5971,7 @@ static int i855_get_display_clock_speed(struct drm_device *dev)
 
 static int i830_get_display_clock_speed(struct drm_device *dev)
 {
-	return 133000;
+	return 133333;
 }
 
 static void