[Intel-gfx] [PATCH] drm/i915: disable LVDS clock gating on CPT

[Rodrigo Vivi]

spec of this reg doesn't say much, but if what you want are:

On Tue, Oct 1, 2013 at 5:18 PM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> Needed to prevent display corruption in high res panels.
>
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/i915_reg.h |    2 ++
>  drivers/gpu/drm/i915/intel_pm.c |    4 +++-
>  2 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 96fd2ce..cca670a 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4338,7 +4338,9 @@
>  #define FDI_RX_CHICKEN(pipe) _PIPE(pipe, _FDI_RXA_CHICKEN, _FDI_RXB_CHICKEN)
>
>  #define SOUTH_DSPCLK_GATE_D    0xc2020
> +#define  PCH_LVDSUNIT_CLOCK_GATE_DISABLE (1<<30)

30
dplunit Gating Disable

>  #define  PCH_DPLSUNIT_CLOCK_GATE_DISABLE (1<<29)
> +#define  PCH_LVDSUNIT2_CLOCK_GATE_DISABLE (1<<14)

14
cpunit Gating Disable


than feel free to use:
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>

>  #define  PCH_LP_PARTITION_LEVEL_DISABLE  (1<<12)
>
>  /* CPU: FDI_TX */
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 698257c..f6765e0 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4791,7 +4791,9 @@ static void cpt_init_clock_gating(struct drm_device *dev)
>          * 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(SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE |
> +                  PCH_LVDSUNIT_CLOCK_GATE_DISABLE |
> +                  PCH_LVDSUNIT2_CLOCK_GATE_DISABLE);
>         I915_WRITE(SOUTH_CHICKEN2, I915_READ(SOUTH_CHICKEN2) |
>                    DPLS_EDP_PPS_FIX_DIS);
>         /* The below fixes the weird display corruption, a few pixels shifted
> --
> 1.7.9.5
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx



-- 
Rodrigo Vivi
Blog: http://blog.vivi.eng.br