From: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
Add SKL and KBL cdclk changes during modeset. Taking into account new
linkrates available using 8640 VCO.
Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 68 ++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2d7ea95..bed03cb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9727,6 +9727,69 @@ static void broadwell_modeset_commit_cdclk(struct drm_atomic_state *old_state)
broadwell_set_cdclk(dev, req_cdclk);
}
+static int skl_modeset_calc_cdclk(struct drm_atomic_state *state)
+{
+ struct drm_i915_private *dev_priv = to_i915(state->dev);
+ int max_pixclk = ilk_max_pixel_rate(state);
+ int cdclk;
+ uint32_t linkrate;
+
+ linkrate = (I915_READ(DPLL_CTRL1) &
+ DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0)) >> 1;
+
+ /*
+ * FIXME should also account for plane ratio
+ * once 64bpp pixel formats are supported.
+ */
+
+ if (linkrate == DPLL_CTRL1_LINK_RATE_2160 ||
+ linkrate == DPLL_CTRL1_LINK_RATE_1080) {
+ /* vco 8640 */
+ if (max_pixclk > 540000)
+ cdclk = 617140;
+ else if (max_pixclk > 432000)
+ cdclk = 540000;
+ else if (max_pixclk > 308570)
+ cdclk = 432000;
+ else
+ cdclk = 308570;
+ }
+ else {
+ /* VCO 8100 */
+ if (max_pixclk > 540000)
+ cdclk = 675000;
+ else if (max_pixclk > 450000)
+ cdclk = 540000;
+ else if (max_pixclk > 337500)
+ cdclk = 450000;
+ else
+ cdclk = 337500;
+ }
+
+ /*
+ * FIXME move the cdclk caclulation to
+ * compute_config() so we can fail gracefully.
+ */
+ if (cdclk > dev_priv->max_cdclk_freq) {
+ DRM_ERROR("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
+ cdclk, dev_priv->max_cdclk_freq);
+ cdclk = dev_priv->max_cdclk_freq;
+ }
+
+ to_intel_atomic_state(state)->cdclk = cdclk;
+
+ return 0;
+}
+
+static void skl_modeset_commit_cdclk(struct drm_atomic_state *old_state)
+{
+ struct drm_device *dev = old_state->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ unsigned int req_cdclk = to_intel_atomic_state(old_state)->cdclk;
+
+ skl_set_cdclk(dev_priv, req_cdclk);
+}
+
static int haswell_crtc_compute_clock(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state)
{
@@ -14831,6 +14894,11 @@ static void intel_init_display(struct drm_device *dev)
broxton_modeset_commit_cdclk;
dev_priv->display.modeset_calc_cdclk =
broxton_modeset_calc_cdclk;
+ } else if (IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) {
+ dev_priv->display.modeset_commit_cdclk =
+ skl_modeset_commit_cdclk;
+ dev_priv->display.modeset_calc_cdclk =
+ skl_modeset_calc_cdclk;
}
switch (INTEL_INFO(dev)->gen) {
--
1.7.9.5
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