drm/i915: clean up and simplify i9xx_crtc_mode_set wrt PLL handling
Flat out skip anything to do with PLL if we have a DSI encoder (and thus
DSI PLL). Also skip PLL computation if the encoder has already set
clocks. This allows for some tidying up of the code, including a
superfluous call to intel_limit() for LVDS downclock path.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.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 a3f21a5..31eac15 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4918,9 +4918,12 @@
num_connectors++;
}
- refclk = i9xx_get_refclk(crtc, num_connectors);
+ if (is_dsi)
+ goto skip_dpll;
- if (!is_dsi && !intel_crtc->config.clock_set) {
+ if (!intel_crtc->config.clock_set) {
+ refclk = i9xx_get_refclk(crtc, num_connectors);
+
/*
* Returns a set of divisors for the desired target clock with
* the given refclk, or FALSE. The returned values represent
@@ -4931,28 +4934,25 @@
ok = dev_priv->display.find_dpll(limit, crtc,
intel_crtc->config.port_clock,
refclk, NULL, &clock);
- if (!ok && !intel_crtc->config.clock_set) {
+ if (!ok) {
DRM_ERROR("Couldn't find PLL settings for mode!\n");
return -EINVAL;
}
- }
- if (is_lvds && dev_priv->lvds_downclock_avail) {
- /*
- * Ensure we match the reduced clock's P to the target clock.
- * If the clocks don't match, we can't switch the display clock
- * by using the FP0/FP1. In such case we will disable the LVDS
- * downclock feature.
- */
- limit = intel_limit(crtc, refclk);
- has_reduced_clock =
- dev_priv->display.find_dpll(limit, crtc,
- dev_priv->lvds_downclock,
- refclk, &clock,
- &reduced_clock);
- }
- /* Compat-code for transition, will disappear. */
- if (!intel_crtc->config.clock_set) {
+ if (is_lvds && dev_priv->lvds_downclock_avail) {
+ /*
+ * Ensure we match the reduced clock's P to the target
+ * clock. If the clocks don't match, we can't switch
+ * the display clock by using the FP0/FP1. In such case
+ * we will disable the LVDS downclock feature.
+ */
+ has_reduced_clock =
+ dev_priv->display.find_dpll(limit, crtc,
+ dev_priv->lvds_downclock,
+ refclk, &clock,
+ &reduced_clock);
+ }
+ /* Compat-code for transition, will disappear. */
intel_crtc->config.dpll.n = clock.n;
intel_crtc->config.dpll.m1 = clock.m1;
intel_crtc->config.dpll.m2 = clock.m2;
@@ -4965,14 +4965,14 @@
has_reduced_clock ? &reduced_clock : NULL,
num_connectors);
} else if (IS_VALLEYVIEW(dev)) {
- if (!is_dsi)
- vlv_update_pll(intel_crtc);
+ vlv_update_pll(intel_crtc);
} else {
i9xx_update_pll(intel_crtc,
has_reduced_clock ? &reduced_clock : NULL,
num_connectors);
}
+skip_dpll:
/* Set up the display plane register */
dspcntr = DISPPLANE_GAMMA_ENABLE;