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drm/i915: Extract intel_adjusted_rate() 

Extract a small helper to calculate the downscaling
adjusted pixel rate/data rate/etc.

v2: Drop the plane visibility check and add a comment explaining why

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210401154043.19466-1-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2021-04-01 18:40:43 +03:00
parent 1884b579c0
commit b876e79d7b
1 changed files with 28 additions and 8 deletions
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36
drivers/gpu/drm/i915/display/intel_atomic_plane.c
View File

@ -133,25 +133,45 @@ intel_plane_destroy_state(struct drm_plane *plane,
kfree(plane_state);
}
unsigned int intel_plane_pixel_rate(const struct intel_crtc_state *crtc_state,
const struct intel_plane_state *plane_state)
static unsigned int intel_adjusted_rate(const struct drm_rect *src,
const struct drm_rect *dst,
unsigned int rate)
{
unsigned int src_w, src_h, dst_w, dst_h;
unsigned int pixel_rate = crtc_state->pixel_rate;
src_w = drm_rect_width(&plane_state->uapi.src) >> 16;
src_h = drm_rect_height(&plane_state->uapi.src) >> 16;
dst_w = drm_rect_width(&plane_state->uapi.dst);
dst_h = drm_rect_height(&plane_state->uapi.dst);
src_w = drm_rect_width(src) >> 16;
src_h = drm_rect_height(src) >> 16;
dst_w = drm_rect_width(dst);
dst_h = drm_rect_height(dst);
/* Downscaling limits the maximum pixel rate */
dst_w = min(src_w, dst_w);
dst_h = min(src_h, dst_h);
return DIV_ROUND_UP_ULL(mul_u32_u32(pixel_rate, src_w * src_h),
return DIV_ROUND_UP_ULL(mul_u32_u32(rate, src_w * src_h),
dst_w * dst_h);
}
unsigned int intel_plane_pixel_rate(const struct intel_crtc_state *crtc_state,
const struct intel_plane_state *plane_state)
{
/*
* Note we don't check for plane visibility here as
* we want to use this when calculating the cursor
* watermarks even if the cursor is fully offscreen.
* That depends on the src/dst rectangles being
* correctly populated whenever the watermark code
* considers the cursor to be visible, whether or not
* it is actually visible.
*
* See: intel_wm_plane_visible() and intel_check_cursor()
*/
return intel_adjusted_rate(&plane_state->uapi.src,
&plane_state->uapi.dst,
crtc_state->pixel_rate);
}
unsigned int intel_plane_data_rate(const struct intel_crtc_state *crtc_state,
const struct intel_plane_state *plane_state)
{