This patch implemnets Workariunds related to display arbitrated memory
bandwidth. These WA are applicabe for all gen-9 based platforms.
Changes since v1:
- Rebase on top of Paulo's patch series
Changes since v2:
- Rebase/rework after addressing Paulo's comments in previous patch
Signed-off-by: "Kumar, Mahesh" <mahesh1.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 9 +++
drivers/gpu/drm/i915/intel_drv.h | 11 +++
drivers/gpu/drm/i915/intel_pm.c | 146 +++++++++++++++++++++++++++++++++++++++
3 files changed, 166 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index adbd9aa..c169360 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1092,6 +1092,13 @@ enum intel_sbi_destination {
SBI_MPHY,
};
+/* SKL+ Watermark arbitrated display bandwidth Workarounds */
+enum watermark_memory_wa {
+ WATERMARK_WA_NONE,
+ WATERMARK_WA_X_TILED,
+ WATERMARK_WA_Y_TILED,
+};
+
#define QUIRK_PIPEA_FORCE (1<<0)
#define QUIRK_LVDS_SSC_DISABLE (1<<1)
#define QUIRK_INVERT_BRIGHTNESS (1<<2)
@@ -1644,6 +1651,8 @@ struct skl_ddb_allocation {
struct skl_wm_values {
unsigned dirty_pipes;
+ /* any WaterMark memory workaround Required */
+ enum watermark_memory_wa mem_wa;
struct skl_ddb_allocation ddb;
uint32_t wm_linetime[I915_MAX_PIPES];
uint32_t plane[I915_MAX_PIPES][I915_MAX_PLANES][8];
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index f48e79a..2c1897b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1813,6 +1813,17 @@ intel_atomic_get_crtc_state(struct drm_atomic_state *state,
return to_intel_crtc_state(crtc_state);
}
+static inline struct intel_crtc_state *
+intel_atomic_get_existing_crtc_state(struct drm_atomic_state *state,
+ struct intel_crtc *crtc)
+{
+ struct drm_crtc_state *crtc_state;
+
+ crtc_state = drm_atomic_get_existing_crtc_state(state, &crtc->base);
+
+ return to_intel_crtc_state(crtc_state);
+}
+
static inline struct intel_plane_state *
intel_atomic_get_existing_plane_state(struct drm_atomic_state *state,
struct intel_plane *plane)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 84ec6b1..5b8f715 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3589,6 +3589,8 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
{
struct drm_plane_state *pstate = &intel_pstate->base;
struct drm_framebuffer *fb = pstate->fb;
+ struct intel_atomic_state *intel_state =
+ to_intel_atomic_state(cstate->base.state);
uint32_t latency = dev_priv->wm.skl_latency[level];
uint32_t method1, method2;
uint32_t plane_bytes_per_line, plane_blocks_per_line;
@@ -3598,10 +3600,17 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
uint32_t width = 0, height = 0;
uint32_t plane_pixel_rate;
uint32_t y_tile_minimum, y_min_scanlines;
+ enum watermark_memory_wa mem_wa;
if (latency == 0 || !cstate->base.active || !intel_pstate->base.visible)
return 0;
+ mem_wa = intel_state ? intel_state->wm_results.mem_wa : WATERMARK_WA_NONE;
+ if (mem_wa != WATERMARK_WA_NONE) {
+ if (fb->modifier[0] == I915_FORMAT_MOD_X_TILED)
+ latency += 15;
+ }
+
width = drm_rect_width(&intel_pstate->base.src) >> 16;
height = drm_rect_height(&intel_pstate->base.src) >> 16;
@@ -3634,6 +3643,9 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
y_min_scanlines = 4;
}
+ if (mem_wa == WATERMARK_WA_Y_TILED)
+ y_min_scanlines *= 2;
+
plane_bytes_per_line = width * cpp;
if (fb->modifier[0] == I915_FORMAT_MOD_Y_TILED ||
fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED) {
@@ -4075,6 +4087,15 @@ skl_include_affected_pipes(struct drm_atomic_state *state)
intel_state->wm_results.dirty_pipes = ~0;
}
+ /*
+ * If Watermark workaround is changed we need to recalculate
+ * watermark values for all active pipes
+ */
+ if (intel_state->wm_results.mem_wa != dev_priv->wm.skl_hw.mem_wa) {
+ realloc_pipes = ~0;
+ intel_state->wm_results.dirty_pipes = ~0;
+ }
+
for_each_intel_crtc_mask(dev, intel_crtc, realloc_pipes) {
struct intel_crtc_state *cstate;
@@ -4087,6 +4108,129 @@ skl_include_affected_pipes(struct drm_atomic_state *state)
}
static void
+skl_set_memory_bandwidth_wm_wa(struct drm_atomic_state *state)
+{
+ struct drm_device *dev = state->dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ struct intel_crtc *intel_crtc;
+ struct intel_plane_state *intel_pstate;
+ struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
+ struct memdev_info *memdev_info = &dev_priv->memdev_info;
+ int num_active_plane, num_active_pipe;
+ uint32_t plane_bw, max_plane_bw, pipe_bw, max_pipe_bw;
+ uint32_t total_pipe_bw;
+ uint32_t system_bw = 0;
+ uint32_t rank;
+ int x_tile_per;
+ int display_bw_per;
+ bool y_tile_enabled = false;
+
+ if (!memdev_info->valid)
+ goto exit;
+
+ system_bw = memdev_info->mem_speed_khz * memdev_info->num_channels *
+ memdev_info->channel_width_bytes;
+
+ if (!system_bw)
+ goto exit;
+
+ max_pipe_bw = 0;
+ for_each_intel_crtc(dev, intel_crtc) {
+ struct intel_crtc_state *cstate;
+ struct intel_plane *plane;
+
+ /*
+ * If CRTC is part of current atomic commit, get crtc state from
+ * existing CRTC state. else take the cached CRTC state
+ */
+ cstate = NULL;
+ if (state)
+ cstate = intel_atomic_get_existing_crtc_state(state,
+ intel_crtc);
+ if (!cstate)
+ cstate = to_intel_crtc_state(intel_crtc->base.state);
+
+ if (!cstate->base.active)
+ continue;
+
+ num_active_plane = 0;
+ max_plane_bw = 0;
+ for_each_intel_plane_mask(dev, plane, cstate->base.plane_mask) {
+ struct drm_framebuffer *fb = NULL;
+
+ intel_pstate = NULL;
+ if (state)
+ intel_pstate =
+ intel_atomic_get_existing_plane_state(state,
+ plane);
+ if (!intel_pstate)
+ intel_pstate =
+ to_intel_plane_state(plane->base.state);
+
+ WARN_ON(!intel_pstate->base.fb);
+
+ if (!intel_pstate->base.visible)
+ continue;
+
+ fb = intel_pstate->base.fb;
+ if (fb && (fb->modifier[0] == I915_FORMAT_MOD_Y_TILED ||
+ fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED))
+ y_tile_enabled = true;
+
+ plane_bw = skl_adjusted_plane_pixel_rate(cstate,
+ intel_pstate);
+ max_plane_bw = max(plane_bw, max_plane_bw);
+ num_active_plane++;
+ }
+ pipe_bw = max_plane_bw * num_active_plane;
+ max_pipe_bw = max(pipe_bw, max_pipe_bw);
+ }
+
+ if (intel_state->active_pipe_changes)
+ num_active_pipe = hweight32(intel_state->active_crtcs);
+ else
+ num_active_pipe = hweight32(dev_priv->active_crtcs);
+
+ total_pipe_bw = max_pipe_bw * num_active_pipe;
+
+ display_bw_per = DIV_ROUND_UP_ULL(total_pipe_bw * 100, system_bw * 1000);
+
+ /*
+ * If there is any Ytile plane enabled and arbitrated display
+ * bandwidth > 20% of raw system memory bandwidth
+ * Enale Y-tile related WA
+ *
+ * If memory is dual channel single rank, Xtile limit = 35%, else Xtile
+ * limit = 60%
+ * If there is no Ytile plane enabled and
+ * arbitrated display bandwidth > Xtile limit
+ * Enable X-tile realated WA
+ */
+ if (y_tile_enabled && (display_bw_per > 20))
+ intel_state->wm_results.mem_wa = WATERMARK_WA_Y_TILED;
+ else {
+
+ if (memdev_info->rank_valid)
+ rank = memdev_info->rank;
+ else
+ rank = DRAM_RANK_DUAL; /* Assume we are dual rank */
+
+ if ((rank == DRAM_RANK_SINGLE) &&
+ (memdev_info->num_channels == 2))
+ x_tile_per = 35;
+ else
+ x_tile_per = 60;
+
+ if (display_bw_per > x_tile_per)
+ intel_state->wm_results.mem_wa = WATERMARK_WA_X_TILED;
+ }
+ return;
+
+exit:
+ intel_state->wm_results.mem_wa = WATERMARK_WA_NONE;
+}
+
+static void
skl_copy_wm_for_pipe(struct skl_wm_values *dst,
struct skl_wm_values *src,
enum pipe pipe)
@@ -4131,6 +4275,8 @@ skl_compute_wm(struct drm_atomic_state *state)
/* Clear all dirty flags */
results->dirty_pipes = 0;
+ skl_set_memory_bandwidth_wm_wa(state);
+
ret = skl_include_affected_pipes(state);
if (ret)
return ret;
--
2.10.1
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