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

BugLink: https://bugs.launchpad.net/bugs/1986718
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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index 4f6a1210c7bcf87f3a3272ee2b5d497cf5e8e4d3..3218caaacb9a9b3f0ab0f46bc5ba550b2d562151 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -2435,7 +2435,7 @@ 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
@@ -2443,7 +2443,7 @@ 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;
 }