[Intel-gfx] [PATCH] drm/i915/cnl: Fix loadgen select programming on ddi vswing sequence

[Paulo Zanoni]

Em Seg, 2017-07-17 às 15:05 -0700, Manasi Navare escreveu:
> The condition for setting the Loadgen Select bit of
> PORT_TX_DW4 register during DDI Vswing Sequence should be
> Bit rate <=6 GHz whereas the existing code checks only
> Bit Rate < 6GHz. This patch fixes this condition.
> While at it also remove the redundant paranthesis.
> 
> Fixes: cf54ca8bc567 ("drm/i915/cnl: Implement voltage swing
> sequence.")
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>

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

> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c
> b/drivers/gpu/drm/i915/intel_ddi.c
> index efb1358..f4fbb39 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -2010,8 +2010,8 @@ static void cnl_ddi_vswing_sequence(struct
> intel_encoder *encoder, u32 level)
>  		val = I915_READ(CNL_PORT_TX_DW4_LN(port, ln));
>  		val &= ~LOADGEN_SELECT;
>  
> -		if (((rate < 600000) && (width == 4) && (ln >=
> 1))  ||
> -		    ((rate < 600000) && (width < 4) && ((ln == 1) ||
> (ln == 2)))) {
> +		if ((rate <= 600000 && width == 4 && ln >= 1)  ||
> +		    (rate <= 600000 && width < 4 && (ln == 1 || ln
> == 2))) {
>  			val |= LOADGEN_SELECT;
>  		}
>  		I915_WRITE(CNL_PORT_TX_DW4_LN(port, ln), val);