[Intel-gfx] [PATCH 1/8] drm/i915/vlv: Fix port B PLL opamp initialization

[Ville Syrjälä]

On Wed, Apr 26, 2017 at 04:40:06PM +0300, Imre Deak wrote:
> The current code looks like a typo, the specification calls for setting
> bits 31:24 to 0x8C, while preserving bits 23:0. Fix things accordingly.

Yeah, as we checked there were a couple of things in the low 24 bits
with non-zero default values.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> 
> I'm not aware of the typo causing a real problem, so the fix is only for
> consistency.
> 
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 85b9e2f5..19a7a1e 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6369,8 +6369,8 @@ static void vlv_pllb_recal_opamp(struct drm_i915_private *dev_priv, enum pipe
>  	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);
>  
>  	reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
> -	reg_val &= 0x8cffffff;
> -	reg_val = 0x8c000000;
> +	reg_val &= 0x00ffffff;
> +	reg_val |= 0x8c000000;
>  	vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);
>  
>  	reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
> -- 
> 2.5.0

-- 
Ville Syrjälä
Intel OTC