On Fri, Sep 06, 2019 at 05:21:42PM -0700, Matt Roper wrote:
> When reading out the BIOS-programmed cdclk state, let's make sure that
> the cdclk value is on the valid list for the platform, ensure that the
> VCO matches the cdclk, and ensure that the CD2X divider was set
> properly.
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Signed-off-by: Matt Roper <matthew.d.ro...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_cdclk.c | 34 ++++++++++++++++++++--
> 1 file changed, 32 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c
> b/drivers/gpu/drm/i915/display/intel_cdclk.c
> index a6696697a09f..356495591cf9 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> @@ -1607,6 +1607,7 @@ static void bxt_set_cdclk(struct drm_i915_private
> *dev_priv,
> static void bxt_sanitize_cdclk(struct drm_i915_private *dev_priv)
> {
> u32 cdctl, expected;
> + int cdclk, vco;
>
> intel_update_cdclk(dev_priv);
> intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
> @@ -1629,8 +1630,37 @@ static void bxt_sanitize_cdclk(struct drm_i915_private
> *dev_priv)
> */
> cdctl &= ~BXT_CDCLK_CD2X_PIPE_NONE;
>
> - expected = (cdctl & BXT_CDCLK_CD2X_DIV_SEL_MASK) |
> - skl_cdclk_decimal(dev_priv->cdclk.hw.cdclk);
> + /* Make sure this is a legal cdclk value for the platform */
> + cdclk = calc_cdclk(dev_priv, dev_priv->cdclk.hw.cdclk);
> + if (cdclk != dev_priv->cdclk.hw.cdclk)
> + goto sanitize;
> +
> + /* Make sure the VCO is correct for the cdclk */
> + vco = calc_cdclk_pll_vco(dev_priv, cdclk);
> + if (vco != dev_priv->cdclk.hw.vco)
> + goto sanitize;
> +
> + expected = skl_cdclk_decimal(cdclk);
> +
> + /* Figure out what CD2X divider we should be using for this cdclk */
> + switch (DIV_ROUND_CLOSEST(dev_priv->cdclk.hw.vco,
> + dev_priv->cdclk.hw.cdclk)) {
> + case 2:
> + expected |= BXT_CDCLK_CD2X_DIV_SEL_1;
> + break;
> + case 3:
> + expected |= BXT_CDCLK_CD2X_DIV_SEL_1_5;
> + break;
> + case 4:
> + expected |= BXT_CDCLK_CD2X_DIV_SEL_2;
> + break;
> + case 8:
> + expected |= BXT_CDCLK_CD2X_DIV_SEL_4;
> + break;
> + default:
> + goto sanitize;
> + }
> +
> /*
> * Disable SSA Precharge when CD clock frequency < 500 MHz,
> * enable otherwise.
> --
> 2.20.1
--
Ville Syrjälä
Intel
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