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drm/i915: Simplify skl_max_scale()

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Now that the planes declare their minimum cdclk requirements properly
we don't need to check the cdclk in skl_max_scale() anymore. Just check
against the maximum downscale ratio, and move the code next to it's
only caller.

v2: Add a comment explaining the HQ vs. not thing

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/20191015193035.25982-7-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä
2019-10-15 22:30:28 +03:00
parent 99efd1c92b
commit dbe20703e1
3 changed files with 17 additions and 41 deletions
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38
drivers/gpu/drm/i915/display/intel_display.c
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@@ -15145,44 +15145,6 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
intel_plane_unpin_fb(old_plane_state);
}
int
skl_max_scale(const struct intel_crtc_state *crtc_state,
const struct drm_format_info *format)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
int max_scale;
int crtc_clock, max_dotclk, tmpclk1, tmpclk2;
if (!crtc_state->base.enable)
return DRM_PLANE_HELPER_NO_SCALING;
crtc_clock = crtc_state->base.adjusted_mode.crtc_clock;
max_dotclk = to_intel_atomic_state(crtc_state->base.state)->cdclk.logical.cdclk;
if (IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10)
max_dotclk *= 2;
if (WARN_ON_ONCE(!crtc_clock || max_dotclk < crtc_clock))
return DRM_PLANE_HELPER_NO_SCALING;
/*
* skl max scale is lower of:
* close to 3 but not 3, -1 is for that purpose
* or
* cdclk/crtc_clock
*/
if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) ||
!drm_format_info_is_yuv_semiplanar(format))
tmpclk1 = 0x30000 - 1;
else
tmpclk1 = 0x20000 - 1;
tmpclk2 = (1 << 8) * ((max_dotclk << 8) / crtc_clock);
max_scale = min(tmpclk1, tmpclk2);
return max_scale;
}
/**
* intel_plane_destroy - destroy a plane
* @plane: plane to destroy