Merge commit '9e9a928eed8796a0a1aaed7e0b676db86ba84594' into drm-next

Merge drm-fixes into drm-next.

Both i915 and radeon need this done for later patches.

Conflicts:
	drivers/gpu/drm/drm_crtc_helper.c
	drivers/gpu/drm/i915/i915_drv.h
	drivers/gpu/drm/i915/i915_gem.c
	drivers/gpu/drm/i915/i915_gem_execbuffer.c
	drivers/gpu/drm/i915/i915_gem_gtt.c

1 files changed, 17 insertions, 3 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index e330e762c360..a4e725c6b8c8 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -289,6 +289,10 @@ void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id)
 	u32 update_pending;
 	int vpos, hpos;
 
+	/* can happen during initialization */
+	if (radeon_crtc == NULL)
+		return;
+
 	spin_lock_irqsave(&rdev->ddev->event_lock, flags);
 	work = radeon_crtc->flip_work;
 	if (work == NULL) {
@@ -872,14 +876,14 @@ static void avivo_reduce_ratio(unsigned *nom, unsigned *den,
 
 	/* make sure nominator is large enough */
         if (*nom < nom_min) {
-		tmp = (nom_min + *nom - 1) / *nom;
+		tmp = DIV_ROUND_UP(nom_min, *nom);
 		*nom *= tmp;
 		*den *= tmp;
 	}
 
 	/* make sure the denominator is large enough */
 	if (*den < den_min) {
-		tmp = (den_min + *den - 1) / *den;
+		tmp = DIV_ROUND_UP(den_min, *den);
 		*nom *= tmp;
 		*den *= tmp;
 	}
@@ -904,7 +908,7 @@ static void avivo_get_fb_ref_div(unsigned nom, unsigned den, unsigned post_div,
 				 unsigned *fb_div, unsigned *ref_div)
 {
 	/* limit reference * post divider to a maximum */
-	ref_div_max = min(210 / post_div, ref_div_max);
+	ref_div_max = max(min(100 / post_div, ref_div_max), 1u);
 
 	/* get matching reference and feedback divider */
 	*ref_div = min(max(DIV_ROUND_CLOSEST(den, post_div), 1u), ref_div_max);
@@ -1039,6 +1043,16 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
 	/* this also makes sure that the reference divider is large enough */
 	avivo_reduce_ratio(&fb_div, &ref_div, fb_div_min, ref_div_min);
 
+	/* avoid high jitter with small fractional dividers */
+	if (pll->flags & RADEON_PLL_USE_FRAC_FB_DIV && (fb_div % 10)) {
+		fb_div_min = max(fb_div_min, (9 - (fb_div % 10)) * 20 + 50);
+		if (fb_div < fb_div_min) {
+			unsigned tmp = DIV_ROUND_UP(fb_div_min, fb_div);
+			fb_div *= tmp;
+			ref_div *= tmp;
+		}
+	}
+
 	/* and finally save the result */
 	if (pll->flags & RADEON_PLL_USE_FRAC_FB_DIV) {
 		*fb_div_p = fb_div / 10;