On Tue, Aug 29, 2017 at 04:22:30PM -0700, Rodrigo Vivi wrote:
> On clock recovery this function is called to find out
> the max voltage swing level that we could go.
>
> However gen 9 functions use the old buffer translation tables
> to figure that out. That table is not valid for CNL
> causing an invalid number of entries and an invalid selection
> on the max voltage swing level.
>
> v2: Let's use same approach that previous platforms.
>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_ddi.c | 35 +++++++++++++++++++++++++++++++----
> 1 file changed, 31 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index f1757a8e481a..97ff082c28a7 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -649,6 +649,29 @@ cnl_get_buf_trans_edp(struct drm_i915_private *dev_priv, int *n_entries)
> }
> }
>
> +static int cnl_max_level(struct drm_i915_private *dev_priv,
> + enum intel_output_type type)
> +{
> + int n_entries = 0;
> +
> + switch (type) {
> + case INTEL_OUTPUT_DP:
> + cnl_get_buf_trans_dp(dev_priv, &n_entries);
> + break;
> + case INTEL_OUTPUT_EDP:
> + cnl_get_buf_trans_edp(dev_priv, &n_entries);
> + break;
> + case INTEL_OUTPUT_HDMI:
> + cnl_get_buf_trans_hdmi(dev_priv, &n_entries);
> + break;
> + default:
> + MISSING_CASE(type);
> + return 0;
> + }
> +
> + return n_entries - 1;
> +}
> +
> static int intel_ddi_hdmi_level(struct drm_i915_private *dev_priv, enum port port)
> {
> int n_hdmi_entries;
> @@ -1879,10 +1902,14 @@ u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder)
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> int n_entries;
>
> - if (encoder->type == INTEL_OUTPUT_EDP)
> - intel_ddi_get_buf_trans_edp(dev_priv, &n_entries);
> - else
> - intel_ddi_get_buf_trans_dp(dev_priv, &n_entries);
> + if (IS_CANNONLAKE(dev_priv)) {
> + cnl_max_level(dev_priv, encoder->type);
You're not actually using the return value. Also the return value has -1
already applied, whereas here we just need the n_entries w/o -1.
> + } else {
> + if (encoder->type == INTEL_OUTPUT_EDP)
> + intel_ddi_get_buf_trans_edp(dev_priv, &n_entries);
> + else
> + intel_ddi_get_buf_trans_dp(dev_priv, &n_entries);
> + }
>
> if (WARN_ON(n_entries < 1))
> n_entries = 1;
> --
> 2.13.2
--
Ville Syrjälä
Intel OTC
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