Commit 99bac306 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Rodrigo Vivi
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drm/i915: Extend the async flip VT-d w/a to skl/bxt 



Looks like skl/bxt/derivatives also need the plane stride
stretch w/a when using async flips and VT-d is enabled, or
else we get corruption on screen. To my surprise this was
even documented in bspec, but only as a note on the
CHICHKEN_PIPESL register description rather than on the
w/a list.

So very much the same thing as on HSW/BDW, except the bits
moved yet again.

Cc: stable@vger.kernel.org
Cc: Karthik B S <karthik.b.s@intel.com>
Fixes: 55ea1cb1 ("drm/i915: Enable async flips in i915")
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210930190943.17547-1-ville.syrjala@linux.intel.com


Reviewed-by: default avatarMatt Roper <matthew.d.roper@intel.com>
(cherry picked from commit d08df3b0)
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
(cherry picked from commit b2d73deb)
Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
parent af6c83ae

drivers/gpu/drm/i915/intel_pm.c

+12 −0
Original line number Diff line number Diff line
@@ -77,6 +77,8 @@ struct intel_wm_config { 


static void gen9_init_clock_gating(struct drm_i915_private *dev_priv)

{

	enum pipe pipe;



	if (HAS_LLC(dev_priv)) {

		/*

		 * WaCompressedResourceDisplayNewHashMode:skl,kbl
@@ -90,6 +92,16 @@ static void gen9_init_clock_gating(struct drm_i915_private *dev_priv) 
			   SKL_DE_COMPRESSED_HASH_MODE);

	}



	for_each_pipe(dev_priv, pipe) {

		/*

		 * "Plane N strech max must be programmed to 11b (x1)

		 *  when Async flips are enabled on that plane."

		 */

		if (!IS_GEMINILAKE(dev_priv) && intel_vtd_active())

			intel_uncore_rmw(&dev_priv->uncore, CHICKEN_PIPESL_1(pipe),

					 SKL_PLANE1_STRETCH_MAX_MASK, SKL_PLANE1_STRETCH_MAX_X1);

	}



	/* See Bspec note for PSR2_CTL bit 31, Wa#828:skl,bxt,kbl,cfl */

	intel_uncore_write(&dev_priv->uncore, CHICKEN_PAR1_1,

		   intel_uncore_read(&dev_priv->uncore, CHICKEN_PAR1_1) | SKL_EDP_PSR_FIX_RDWRAP);