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drm/i915: Implement w/a 22010492432 for adl-s

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commit 13bd259b64bb58ae130923ada42ebc19bf3f2fa2 upstream.

adl-s needs the combo PLL DCO fraction w/a as well.
Gets us slightly more accurate clock out of the PLL.

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220613201439.23341-1-ville.syrjala@linux.intel.com
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
(cherry picked from commit d36bdd77b9e6aa7f5cb7b0f11ebbab8e5febf10b)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ville Syrjälä 2022-06-13 23:14:39 +03:00 committed by Greg Kroah-Hartman
parent bae4d6a2dd
commit 0895a2235b
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/display/intel_dpll_mgr.c
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@ -2434,7 +2434,7 @@ static void icl_wrpll_params_populate(struct skl_wrpll_params *params,
}
/*
* Display WA #22010492432: ehl, tgl, adl-p
* Display WA #22010492432: ehl, tgl, adl-s, adl-p
* Program half of the nominal DCO divider fraction value.
*/
static bool
@ -2442,7 +2442,7 @@ ehl_combo_pll_div_frac_wa_needed(struct drm_i915_private *i915)
{
return ((IS_PLATFORM(i915, INTEL_ELKHARTLAKE) &&
IS_JSL_EHL_DISPLAY_STEP(i915, STEP_B0, STEP_FOREVER)) ||
IS_TIGERLAKE(i915) || IS_ALDERLAKE_P(i915)) &&
IS_TIGERLAKE(i915) || IS_ALDERLAKE_S(i915) || IS_ALDERLAKE_P(i915)) &&
i915->dpll.ref_clks.nssc == 38400;
}