drm/i915: add Ivybridge clock gating init function
Some of the bits have changed, including one we were setting that enables
a VGA test mode, preventing pipe B from working at all. So add a new
IVB specific function with the right bits.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
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 7eeffaf..b8b4a2e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7336,6 +7336,33 @@
DISPPLANE_TRICKLE_FEED_DISABLE);
}
+static void ivybridge_init_clock_gating(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int pipe;
+ uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
+
+ I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
+
+ /*
+ * On Ibex Peak and Cougar Point, we need to disable clock
+ * gating for the panel power sequencer or it will fail to
+ * start up when no ports are active.
+ */
+ I915_WRITE(SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE);
+
+ I915_WRITE(WM3_LP_ILK, 0);
+ I915_WRITE(WM2_LP_ILK, 0);
+ I915_WRITE(WM1_LP_ILK, 0);
+
+ I915_WRITE(ILK_DSPCLK_GATE, IVB_VRHUNIT_CLK_GATE);
+
+ for_each_pipe(pipe)
+ I915_WRITE(DSPCNTR(pipe),
+ I915_READ(DSPCNTR(pipe)) |
+ DISPPLANE_TRICKLE_FEED_DISABLE);
+}
+
static void g4x_init_clock_gating(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -7603,7 +7630,7 @@
"Disable CxSR\n");
dev_priv->display.update_wm = NULL;
}
- dev_priv->display.init_clock_gating = gen6_init_clock_gating;
+ dev_priv->display.init_clock_gating = ivybridge_init_clock_gating;
} else
dev_priv->display.update_wm = NULL;