From 46b77d237a5c4c393f5461729291030fc3e6e120 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Thu, 7 Oct 2010 16:01:25 -0700 Subject: [PATCH] drm/i915: diasable clock gating for the panel power sequencer commit 382b09362711d7d03272230a33767015a277926e upstream. Needed on Ibex Peak and Cougar Point or the panel won't always come on. Signed-off-by: Jesse Barnes Signed-off-by: Chris Wilson Signed-off-by: Greg Kroah-Hartman Signed-off-by: Andi Kleen --- drivers/gpu/drm/i915/i915_reg.h | 3 +++ drivers/gpu/drm/i915/intel_display.c | 7 +++++++ 2 files changed, 10 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index bed6a5eb4e99..140f01718631 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -2709,6 +2709,9 @@ #define FDI_RXB_CHICKEN 0xc2010 #define FDI_RX_PHASE_SYNC_POINTER_ENABLE (1) +#define SOUTH_DSPCLK_GATE_D 0xc2020 +#define PCH_DPLSUNIT_CLOCK_GATE_DISABLE (1<<29) + /* CPU: FDI_TX */ #define FDI_TXA_CTL 0x60100 #define FDI_TXB_CTL 0x61100 diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index d1c12435af48..660c67cac242 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5415,6 +5415,13 @@ void intel_init_clock_gating(struct drm_device *dev) 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); + /* * According to the spec the following bits should be set in * order to enable memory self-refresh -- 2.39.5