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    Subject[PATCH 6.0 184/862] drm/i915: Fix watermark calculations for gen12+ RC CCS modifier
    Date
    From: Ville Syrjälä <ville.syrjala@linux.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@vger.kernel.org
    Fixes: b3e57bccd68a ("drm/i915/tgl: Gen-12 render decompression")
    Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
    Signed-off-by: Ville Syrjälä <ville.syrjala@linux.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@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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
    @@ -5308,10 +5308,12 @@ skl_compute_wm_params(const struct intel
    modifier == I915_FORMAT_MOD_4_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;

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