drm/i915: set CB tuning also for the reduce clock
Since the ratio is different, we also need to pass in the parameters
for the reduced clock. Might or might not reduce flicker for the
auto-downclocking on lvds/eDP.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f235e8a..b884932 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5469,7 +5469,8 @@
}
static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
- intel_clock_t *clock, u32 *fp)
+ intel_clock_t *clock, u32 *fp,
+ intel_clock_t *reduced_clock, u32 *fp2)
{
struct drm_crtc *crtc = &intel_crtc->base;
struct drm_device *dev = crtc->dev;
@@ -5511,6 +5512,9 @@
if (clock->m < factor * clock->n)
*fp |= FP_CB_TUNE;
+ if (fp2 && (reduced_clock->m < factor * reduced_clock->n))
+ *fp2 |= FP_CB_TUNE;
+
dpll = 0;
if (is_lvds)
@@ -5626,7 +5630,8 @@
fp2 = reduced_clock.n << 16 | reduced_clock.m1 << 8 |
reduced_clock.m2;
- dpll = ironlake_compute_dpll(intel_crtc, &clock, &fp);
+ dpll = ironlake_compute_dpll(intel_crtc, &clock, &fp, &reduced_clock,
+ has_reduced_clock ? &fp2 : NULL);
DRM_DEBUG_KMS("Mode for pipe %d:\n", pipe);
drm_mode_debug_printmodeline(mode);