linux-kernel - [PATCH 5.15 130/530] drm/i915: Fix watermark calculations for gen12+ RC CCS modifier

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Date:   Mon, 24 Oct 2022 13:27:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Juha-Pekka Heikkila <juhapekka.heikkila@...il.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Subject: [PATCH 5.15 130/530] drm/i915: Fix watermark calculations for gen12+ RC CCS modifier

From: Ville Syrjälä <ville.syrjala@...ux.intel.com>

commit c56453a00f19ccddee302f5f9fe96b80e0b47fd3 upstream.

Take the gen12+ RC CCS modifier into account when calculating the
watermarks. Othwerwise we'll calculate the watermarks thinking this
Y-tiled modifier is linear.

The rc_surface part is actually a nop since that is not used
for any glk+ platform.

v2: Split RC CCS vs. MC CCS to separate patches

Cc: stable@...r.kernel.org
Fixes: b3e57bccd68a ("drm/i915/tgl: Gen-12 render decompression")
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@...il.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221003111544.8007-2-ville.syrjala@linux.intel.com
(cherry picked from commit a89a96a586114f67598c6391c75678b4dba5c2da)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/i915/intel_pm.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5402,10 +5402,12 @@ skl_compute_wm_params(const struct intel
 	wp->y_tiled = modifier == I915_FORMAT_MOD_Y_TILED ||
 		      modifier == I915_FORMAT_MOD_Yf_TILED ||
 		      modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
-		      modifier == I915_FORMAT_MOD_Yf_TILED_CCS;
+		      modifier == I915_FORMAT_MOD_Yf_TILED_CCS ||
+		      modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS;
 	wp->x_tiled = modifier == I915_FORMAT_MOD_X_TILED;
 	wp->rc_surface = modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
-			 modifier == I915_FORMAT_MOD_Yf_TILED_CCS;
+			 modifier == I915_FORMAT_MOD_Yf_TILED_CCS ||
+			 modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS;
 	wp->is_planar = intel_format_info_is_yuv_semiplanar(format, modifier);
 
 	wp->width = width;