drm/i915: track is_dual_link in intel_lvds
Yeah, all users (both the clock selection special cases and the lvds
pin pair stuff) are still in common code, but this will change.
v2: Rebase on top of Jani Nikula's panel rework.
v3: Incorporate review from Paulo Zanoni:
- s/__is_dual_link_lvds/compute_is_dual_link_lvds
- kill dev_priv->lvds_val
- drop spurious whitespace change
v4: Add a debug printk to display the dual-link status, as suggested
by Paulo Zanoni in review.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> (v3)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 4158a88..31fdbfd 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -52,6 +52,7 @@
u32 pfit_control;
u32 pfit_pgm_ratios;
bool pfit_dirty;
+ bool is_dual_link;
struct intel_lvds_connector *attached_connector;
};
@@ -923,6 +924,23 @@
bool intel_is_dual_link_lvds(struct drm_device *dev)
{
+ struct intel_encoder *encoder;
+ struct intel_lvds_encoder *lvds_encoder;
+
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list,
+ base.head) {
+ if (encoder->type == INTEL_OUTPUT_LVDS) {
+ lvds_encoder = to_lvds_encoder(&encoder->base);
+
+ return lvds_encoder->is_dual_link;
+ }
+ }
+
+ return false;
+}
+
+static bool compute_is_dual_link_lvds(struct drm_device *dev)
+{
unsigned int val;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 lvds_reg;
@@ -940,19 +958,15 @@
if (dmi_check_system(intel_dual_link_lvds))
return true;
- if (dev_priv->lvds_val)
- val = dev_priv->lvds_val;
- else {
- /* BIOS should set the proper LVDS register value at boot, but
- * in reality, it doesn't set the value when the lid is closed;
- * we need to check "the value to be set" in VBT when LVDS
- * register is uninitialized.
- */
- val = I915_READ(lvds_reg);
- if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
- val = dev_priv->bios_lvds_val;
- dev_priv->lvds_val = val;
- }
+ /* BIOS should set the proper LVDS register value at boot, but
+ * in reality, it doesn't set the value when the lid is closed;
+ * we need to check "the value to be set" in VBT when LVDS
+ * register is uninitialized.
+ */
+ val = I915_READ(lvds_reg);
+ if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
+ val = dev_priv->bios_lvds_val;
+
return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
}
@@ -1162,6 +1176,10 @@
goto failed;
out:
+ lvds_encoder->is_dual_link = compute_is_dual_link_lvds(dev);
+ DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
+ lvds_encoder->is_dual_link ? "dual" : "single");
+
/*
* Unlock registers and just
* leave them unlocked