[Intel-gfx] [PATCH 2/3] drm/i915: Program DSPCLK_GATE_D only once on Ironlake

[Paulo Zanoni]

Hi

2012/10/19 Damien Lespiau <damien.lespiau at gmail.com>:
> From: Damien Lespiau <damien.lespiau at intel.com>
>
> With the consolidated registers, it appears that we're setting the same
> bis several times. Let's just collect the bits we want to set and program
> it once.
>
> v2: More cleanup. Also program 0x42004 and 0x45000 for FBC on non
>     mobile platforms (Paulo Zanoni)
>
> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c |   37 ++++++++++++-------------------------
>  1 files changed, 12 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index e8a6076..b4120c9 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3297,21 +3297,12 @@ static void ironlake_init_clock_gating(struct drm_device *dev)
>         struct drm_i915_private *dev_priv = dev->dev_private;
>         uint32_t dspclk_gate = ILK_VRHUNIT_CLOCK_GATE_DISABLE;
>
> -       /* Required for FBC */
> -       dspclk_gate |= ILK_DPFCUNIT_CLOCK_GATE_DISABLE |
> -               ILK_DPFCRUNIT_CLOCK_GATE_DISABLE |
> -               ILK_DPFDUNIT_CLOCK_GATE_ENABLE;
> -       /* Required for CxSR */
> -       dspclk_gate |= ILK_DPARBUNIT_CLOCK_GATE_ENABLE;
> -
>         I915_WRITE(PCH_3DCGDIS0,
>                    MARIUNIT_CLOCK_GATE_DISABLE |
>                    SVSMUNIT_CLOCK_GATE_DISABLE);
>         I915_WRITE(PCH_3DCGDIS1,
>                    VFMUNIT_CLOCK_GATE_DISABLE);
>
> -       I915_WRITE(ILK_DSPCLK_GATE_D, dspclk_gate);
> -
>         /*
>          * According to the spec the following bits should be set in
>          * order to enable memory self-refresh
> @@ -3322,9 +3313,7 @@ static void ironlake_init_clock_gating(struct drm_device *dev)
>         I915_WRITE(ILK_DISPLAY_CHICKEN2,
>                    (I915_READ(ILK_DISPLAY_CHICKEN2) |
>                     ILK_DPARB_GATE | ILK_VSDPFD_FULL));
> -       I915_WRITE(ILK_DSPCLK_GATE_D,
> -                  (I915_READ(ILK_DSPCLK_GATE_D) |
> -                   ILK_DPARBUNIT_CLOCK_GATE_ENABLE));
> +       dspclk_gate |= ILK_DPARBUNIT_CLOCK_GATE_ENABLE;
>         I915_WRITE(DISP_ARB_CTL,
>                    (I915_READ(DISP_ARB_CTL) |
>                     DISP_FBC_WM_DIS));
> @@ -3339,19 +3328,17 @@ static void ironlake_init_clock_gating(struct drm_device *dev)
>          * The bit 22 of 0x42004
>          * The bit 7,8,9 of 0x42020.
>          */
> -       if (IS_IRONLAKE_M(dev)) {
> -               I915_WRITE(ILK_DISPLAY_CHICKEN1,
> -                          I915_READ(ILK_DISPLAY_CHICKEN1) |
> -                          ILK_FBCQ_DIS);
> -               I915_WRITE(ILK_DISPLAY_CHICKEN2,
> -                          I915_READ(ILK_DISPLAY_CHICKEN2) |
> -                          ILK_DPARB_GATE);
> -               I915_WRITE(ILK_DSPCLK_GATE_D,
> -                          I915_READ(ILK_DSPCLK_GATE_D) |
> -                          ILK_DPFCRUNIT_CLOCK_GATE_DISABLE |
> -                          ILK_DPFCUNIT_CLOCK_GATE_DISABLE |
> -                          ILK_DPFDUNIT_CLOCK_GATE_ENABLE);
> -       }
> +       I915_WRITE(ILK_DISPLAY_CHICKEN1,
> +                  I915_READ(ILK_DISPLAY_CHICKEN1) |
> +                  ILK_FBCQ_DIS);
> +       I915_WRITE(ILK_DISPLAY_CHICKEN2,
> +                  I915_READ(ILK_DISPLAY_CHICKEN2) |
> +                  ILK_DPARB_GATE);

This is not exactly what I suggested, I think those 2 regs could stay
inside the if is_mobile, just move the dspclk_gate outside (so we keep
the current behavior).

With that:
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

> +       dspclk_gate |= ILK_DPFCRUNIT_CLOCK_GATE_DISABLE |
> +                  ILK_DPFCUNIT_CLOCK_GATE_DISABLE |
> +                  ILK_DPFDUNIT_CLOCK_GATE_ENABLE;
> +
> +       I915_WRITE(ILK_DSPCLK_GATE_D, dspclk_gate);
>
>         I915_WRITE(ILK_DISPLAY_CHICKEN2,
>                    I915_READ(ILK_DISPLAY_CHICKEN2) |
> --
> 1.7.7.5
>
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-- 
Paulo Zanoni