drm/i915: Initialize PCH refclks at modeset init time
The reference clock configuration must be done before any mode setting
can occur as all outputs must be disabled to change
anything. Initialize the clocks after turning everything off during
the initialization process.
Also, re-initialize the refclk at resume time.
Signed-off-by: Keith Packard <keithp@keithp.com>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b072a35..91d7d5ed 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5109,7 +5109,10 @@
return ret;
}
-static void ironlake_update_pch_refclk(struct drm_device *dev)
+/*
+ * Initialize reference clocks when the driver loads
+ */
+void ironlake_init_pch_refclk(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_mode_config *mode_config = &dev->mode_config;
@@ -5411,8 +5414,6 @@
ironlake_compute_m_n(intel_crtc->bpp, lane, target_clock, link_bw,
&m_n);
- ironlake_update_pch_refclk(dev);
-
fp = clock.n << 16 | clock.m1 << 8 | clock.m2;
if (has_reduced_clock)
fp2 = reduced_clock.n << 16 | reduced_clock.m1 << 8 |
@@ -7284,6 +7285,9 @@
/* disable all the possible outputs/crtcs before entering KMS mode */
drm_helper_disable_unused_functions(dev);
+
+ if (HAS_PCH_SPLIT(dev))
+ ironlake_init_pch_refclk(dev);
}
static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)