From 96dc6ed879439d6c12fd6c4ec2fbb62dd4e85998 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 22 Jan 2021 22:56:29 +0200 Subject: [PATCH] drm/i915: Introduce skl_ddb_entry_for_slices() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Generalize icl_get_first_dbuf_slice_offset() into something that just gives us the start+end of the dbuf chunk covered by the specified slices as a standard ddb entry. Initial idea was to use it during readout as well, but we shall see. Reviewed-by: Stanislav Lisovskiy Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20210122205633.18492-5-ville.syrjala@linux.intel.com --- drivers/gpu/drm/i915/intel_pm.c | 55 ++++++++++++++--------------------------- 1 file changed, 18 insertions(+), 37 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 2b53e50..b88429b 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4035,25 +4035,23 @@ static int intel_dbuf_slice_size(struct drm_i915_private *dev_priv) INTEL_INFO(dev_priv)->num_supported_dbuf_slices; } -/* - * Calculate initial DBuf slice offset, based on slice size - * and mask(i.e if slice size is 1024 and second slice is enabled - * offset would be 1024) - */ -static unsigned int -icl_get_first_dbuf_slice_offset(u32 dbuf_slice_mask, - u32 slice_size, - u32 ddb_size) +static void +skl_ddb_entry_for_slices(struct drm_i915_private *dev_priv, u8 slice_mask, + struct skl_ddb_entry *ddb) { - unsigned int offset = 0; + int slice_size = intel_dbuf_slice_size(dev_priv); - if (!dbuf_slice_mask) - return 0; + if (!slice_mask) { + ddb->start = 0; + ddb->end = 0; + return; + } - offset = (ffs(dbuf_slice_mask) - 1) * slice_size; + ddb->start = (ffs(slice_mask) - 1) * slice_size; + ddb->end = fls(slice_mask) * slice_size; - WARN_ON(offset >= ddb_size); - return offset; + WARN_ON(ddb->start >= ddb->end); + WARN_ON(ddb->end > intel_dbuf_size(dev_priv)); } u32 skl_ddb_dbuf_slice_mask(struct drm_i915_private *dev_priv, @@ -4123,12 +4121,10 @@ skl_ddb_get_pipe_allocation_limits(struct drm_i915_private *dev_priv, const struct intel_dbuf_state *old_dbuf_state = intel_atomic_get_old_dbuf_state(intel_state); u8 active_pipes = new_dbuf_state->active_pipes; - u16 ddb_size; + struct skl_ddb_entry ddb_slices; u32 ddb_range_size; u32 i; u32 dbuf_slice_mask; - u32 offset; - u32 slice_size; u32 total_slice_mask; u32 start, end; int ret; @@ -4141,9 +4137,6 @@ skl_ddb_get_pipe_allocation_limits(struct drm_i915_private *dev_priv, return 0; } - ddb_size = intel_dbuf_size(dev_priv); - slice_size = intel_dbuf_slice_size(dev_priv); - /* * If the state doesn't change the active CRTC's or there is no * modeset request, then there's no need to recalculate; @@ -4169,20 +4162,8 @@ skl_ddb_get_pipe_allocation_limits(struct drm_i915_private *dev_priv, */ dbuf_slice_mask = skl_compute_dbuf_slices(for_crtc, active_pipes); - /* - * Figure out at which DBuf slice we start, i.e if we start at Dbuf S2 - * and slice size is 1024, the offset would be 1024 - */ - offset = icl_get_first_dbuf_slice_offset(dbuf_slice_mask, - slice_size, ddb_size); - - /* - * Figure out total size of allowed DBuf slices, which is basically - * a number of allowed slices for that pipe multiplied by slice size. - * Inside of this - * range ddb entries are still allocated in proportion to display width. - */ - ddb_range_size = hweight8(dbuf_slice_mask) * slice_size; + skl_ddb_entry_for_slices(dev_priv, dbuf_slice_mask, &ddb_slices); + ddb_range_size = skl_ddb_entry_size(&ddb_slices); total_slice_mask = dbuf_slice_mask; for_each_new_intel_crtc_in_state(intel_state, crtc, crtc_state, i) { @@ -4239,8 +4220,8 @@ skl_ddb_get_pipe_allocation_limits(struct drm_i915_private *dev_priv, start = ddb_range_size * weight_before_pipe / total_weight; end = ddb_range_size * (weight_before_pipe + pipe_weight) / total_weight; - alloc->start = offset + start; - alloc->end = offset + end; + alloc->start = ddb_slices.start + start; + alloc->end = ddb_slices.start + end; drm_dbg_kms(&dev_priv->drm, "[CRTC:%d:%s] dbuf slices 0x%x, ddb (%d - %d), active pipes 0x%x\n", -- 2.7.4