In case of Y-Tiling, "plane_blocks_per_line" calculation is different
than X/None-Tiling case.
This patch corrects this calculation according to Bspec.
plane blocks per line = Plane memory format is Y tile ?
ceiling[4 * plane bytes per line / 512]/4 :
ceiling[plane bytes per line / 512]
As per BSpec Don't increment selected "result_blocks" & "result_lines"
in case of BROXTON.
Signed-off-by: Kumar, Mahesh <mahesh1.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a1ed920..5cfb5d9 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3247,7 +3247,13 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
latency);
plane_bytes_per_line = p_params->horiz_pixels * bytes_per_pixel;
- plane_blocks_per_line = DIV_ROUND_UP(plane_bytes_per_line, 512);
+
+ if (p_params->tiling == I915_FORMAT_MOD_Y_TILED ||
+ p_params->tiling == I915_FORMAT_MOD_Yf_TILED) {
+ plane_blocks_per_line = DIV_ROUND_UP(4 * plane_bytes_per_line, 512);
+ plane_blocks_per_line /= 4;
+ } else
+ plane_blocks_per_line = DIV_ROUND_UP(plane_bytes_per_line, 512);
if (p_params->tiling == I915_FORMAT_MOD_Y_TILED ||
p_params->tiling == I915_FORMAT_MOD_Yf_TILED) {
@@ -3277,7 +3283,7 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
res_blocks = selected_result + 1;
res_lines = DIV_ROUND_UP(selected_result, plane_blocks_per_line);
- if (level >= 1 && level <= 7) {
+ if (level >= 1 && level <= 7 && !IS_BROXTON(dev_priv->dev)) {
if (p_params->tiling == I915_FORMAT_MOD_Y_TILED ||
p_params->tiling == I915_FORMAT_MOD_Yf_TILED)
res_lines += 4;
--
1.9.1
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