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drm/i915: De-magic the VLV p2 divider step size 

The p2 divider on VLV needs to be even when it's > 10. The current code
to make that happen is rather weird. Just make the step size adjustement
in the for loop decrement step.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2013-09-24 21:26:23 +03:00 committed by Daniel Vetter
parent 6b4bf1c495
commit c1a9ae4388
1 changed files with 2 additions and 3 deletions
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5
drivers/gpu/drm/i915/intel_display.c
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@ -688,9 +688,8 @@ vlv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
/* based on hardware requirement, prefer smaller n to precision */
for (clock.n = limit->n.min; clock.n <= ((refclk) / minupdate); clock.n++) {
for (clock.p1 = limit->p1.max; clock.p1 > limit->p1.min; clock.p1--) {
for (clock.p2 = limit->p2.p2_fast+1; clock.p2 > 0; clock.p2--) {
if (clock.p2 > 10)
clock.p2--;
for (clock.p2 = limit->p2.p2_fast; clock.p2 > 0;
clock.p2 -= clock.p2 > 10 ? 2 : 1) {
clock.p = clock.p1 * clock.p2;
/* based on hardware requirement, prefer bigger m1,m2 values */
for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max; clock.m1++) {