On Thu, Apr 25, 2013 at 02:15:25PM -0300, Rodrigo Vivi wrote:
> Display register 46500h bit 23 must be set to 1b for the entire time that
> Frame Buffer Compression is enabled.
>
> v2: Ville suggested to enable it back when disabling fbc to avoid wasting
> power.
>
> v3: RMW to preserve other bits (by Ville)
>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.v...@gmail.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 3 +++
> drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++
> 2 files changed, 13 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 922a7a0..82eaa69 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -871,6 +871,9 @@
> _HSW_PIPE_SLICE_CHICKEN_1_A, + \
> _HSW_PIPE_SLICE_CHICKEN_1_B)
>
> +#define HSW_CLKGATE_DISABLE_PART_1 0x46500
> +#define HSW_DPFC_GATING_DISABLE (1<<23)
> +
> /*
> * GPIO regs
> */
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 9d36158..67b6eab 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -248,6 +248,12 @@ static void ironlake_disable_fbc(struct drm_device *dev)
> I915_READ(ILK_DSPCLK_GATE_D) &
> ~ILK_DPFCUNIT_CLOCK_GATE_DISABLE);
>
> + if(IS_HASWELL(dev))
> + /* WaFbcDisableDpfcClockGating */
> + I915_WRITE(HSW_CLKGATE_DISABLE_PART_1,
> + I915_READ(HSW_CLKGATE_DISABLE_PART_1) &
> + ~HSW_DPFC_GATING_DISABLE);
> +
> DRM_DEBUG_KMS("disabled FBC\n");
> }
> }
> @@ -285,6 +291,10 @@ static void gen7_enable_fbc(struct drm_crtc *crtc,
> unsigned long interval)
> /* WaFbcAsynchFlipDisableFbcQueue */
> I915_WRITE(HSW_PIPE_SLICE_CHICKEN_1(intel_crtc->pipe),
> HSW_BYPASS_FBC_QUEUE);
> + /* WaFbcDisableDpfcClockGating */
> + I915_WRITE(HSW_CLKGATE_DISABLE_PART_1,
> + I915_READ(HSW_CLKGATE_DISABLE_PART_1) &
^
'|' again.
> + HSW_DPFC_GATING_DISABLE);
> }
>
> I915_WRITE(SNB_DPFC_CTL_SA,
> --
> 1.8.1.4
--
Ville Syrjälä
Intel OTC
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