From: "Kumar, Mahesh" <mahesh1.kumar@xxxxxxxxx>
don't always use 8 ddb as minimum, instead calculate using proper
algorithm.
v2: optimizations as per Matt's comments.
v3 (by Matt):
- Fix boolean logic for !fb test in skl_ddb_min_alloc()
- Adjust negative tiling format comparisons in skl_ddb_min_alloc() to
improve readability.
v4 (by Matt):
- Rebase onto recent atomic watermark changes
- Slight tweaks to code flow to make the logic more closely match the
description in the bspec.
Cc: matthew.d.roper@xxxxxxxxx
Signed-off-by: Kumar, Mahesh <mahesh1.kumar@xxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 62 +++++++++++++++++++++++++++++++++++++----
1 file changed, 57 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 95f9bb5..d7165b5 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3038,6 +3038,61 @@ skl_get_total_relative_data_rate(struct intel_crtc_state *intel_cstate)
return total_data_rate;
}
+static uint16_t
+skl_ddb_min_alloc(const struct drm_plane_state *pstate,
+ const int y)
+{
+ struct drm_framebuffer *fb = pstate->fb;
+ struct intel_plane_state *intel_pstate = to_intel_plane_state(pstate);
+ uint32_t src_w, src_h;
+ uint32_t min_scanlines = 8;
+ uint8_t plane_bpp;
+
+ if (WARN_ON(!fb))
+ return 0;
+
+ /* For packed formats, no y-plane, return 0 */
+ if (y && fb->pixel_format != DRM_FORMAT_NV12)
+ return 0;
+
+ /* For Non Y-tile return 8-blocks */
+ if (fb->modifier[0] != I915_FORMAT_MOD_Y_TILED &&
+ fb->modifier[0] != I915_FORMAT_MOD_Yf_TILED)
+ return 8;
+
+ src_w = drm_rect_width(&intel_pstate->src) >> 16;
+ src_h = drm_rect_height(&intel_pstate->src) >> 16;
+
+ if (intel_rotation_90_or_270(pstate->rotation))
+ swap(src_w, src_h);
+
+ /* Halve UV plane width and height for NV12 */
+ if (fb->pixel_format == DRM_FORMAT_NV12 && !y) {
+ src_w /= 2;
+ src_h /= 2;
+ }
+
+ plane_bpp = y ? drm_format_plane_cpp(fb->pixel_format, 0) :
+ drm_format_plane_cpp(fb->pixel_format, 1);
+
+ if (intel_rotation_90_or_270(pstate->rotation)) {
+ switch (plane_bpp) {
+ case 1:
+ min_scanlines = 32;
+ break;
+ case 2:
+ min_scanlines = 16;
+ break;
+ default:
+ WARN(1, "Unsupported pixel depth %u for rotation",
+ plane_bpp);
+ min_scanlines = 32;
+ }
+ }
+
+ return DIV_ROUND_UP((4 * src_w * plane_bpp), 512) * min_scanlines/4 + 3;
+}
+
static int
skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
struct skl_ddb_allocation *ddb /* out */)
@@ -3100,11 +3155,8 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
continue;
}
- minimum[id] = 8;
- if (pstate->fb->pixel_format == DRM_FORMAT_NV12)
- y_minimum[id] = 8;
- else
- y_minimum[id] = 0;
+ minimum[id] = skl_ddb_min_alloc(pstate, 0);
+ y_minimum[id] = skl_ddb_min_alloc(pstate, 1);
}
for (i = 0; i < PLANE_CURSOR; i++) {
--
2.1.4
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