[PATCH 06/17] drm/i915/icl: Do not fix dbuf block size to 512

Paulo Zanoni
2018-01-23T19:05:55Z

From: Mahesh Kumar <mahesh1.kumar@intel.com>

GEN9/10 had fixed DBuf block size of 512. Dbuf block size is not a
fixed number anymore in GEN11, it varies according to bits per pixel
and tiling. If 8bpp & Yf-tile surface, block size = 256 else block
size = 512

This patch addresses the same.

v2 (from Paulo):
- Make it compile.
- Fix a few coding style issues.
v3
- Rebase on top of upstream patches

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 27 ++++++++++++++++++++-------
2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8333692dac5a..cc5ac327f267 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1460,6 +1460,7 @@ struct skl_wm_params {
uint_fixed_16_16_t plane_blocks_per_line;
uint_fixed_16_16_t y_tile_minimum;
uint32_t linetime_us;
+ uint32_t dbuf_block_size;
};

/*
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 11aac65d1543..44d952a3d9a6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4312,7 +4312,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
*/
static uint_fixed_16_16_t
skl_wm_method1(const struct drm_i915_private *dev_priv, uint32_t pixel_rate,
- uint8_t cpp, uint32_t latency)
+ uint8_t cpp, uint32_t latency, uint32_t dbuf_block_size)
{
uint32_t wm_intermediate_val;
uint_fixed_16_16_t ret;
@@ -4321,7 +4321,7 @@ skl_wm_method1(const struct drm_i915_private *dev_priv, uint32_t pixel_rate,
return FP_16_16_MAX;

wm_intermediate_val = latency * pixel_rate * cpp;
- ret = div_fixed16(wm_intermediate_val, 1000 * 512);
+ ret = div_fixed16(wm_intermediate_val, 1000 * dbuf_block_size);

if (INTEL_GEN(dev_priv) >= 10)
ret = add_fixed16_u32(ret, 1);
@@ -4431,6 +4431,15 @@ skl_compute_plane_wm_params(const struct drm_i915_private *dev_priv,
wp->plane_pixel_rate = skl_adjusted_plane_pixel_rate(cstate,
intel_pstate);

+ if (INTEL_GEN(dev_priv) >= 11) {
+ if (fb->modifier == I915_FORMAT_MOD_Yf_TILED && wp->cpp == 8)
+ wp->dbuf_block_size = 256;
+ else
+ wp->dbuf_block_size = 512;
+ } else {
+ wp->dbuf_block_size = 512;
+ }
+
if (drm_rotation_90_or_270(pstate->rotation)) {

switch (wp->cpp) {
@@ -4457,7 +4466,8 @@ skl_compute_plane_wm_params(const struct drm_i915_private *dev_priv,
wp->plane_bytes_per_line = wp->width * wp->cpp;
if (wp->y_tiled) {
interm_pbpl = DIV_ROUND_UP(wp->plane_bytes_per_line *
- wp->y_min_scanlines, 512);
+ wp->y_min_scanlines,
+ wp->dbuf_block_size);

if (INTEL_GEN(dev_priv) >= 10)
interm_pbpl++;
@@ -4465,10 +4475,12 @@ skl_compute_plane_wm_params(const struct drm_i915_private *dev_priv,
wp->plane_blocks_per_line = div_fixed16(interm_pbpl,
wp->y_min_scanlines);
} else if (wp->x_tiled && IS_GEN9(dev_priv)) {
- interm_pbpl = DIV_ROUND_UP(wp->plane_bytes_per_line, 512);
+ interm_pbpl = DIV_ROUND_UP(wp->plane_bytes_per_line,
+ wp->dbuf_block_size);
wp->plane_blocks_per_line = u32_to_fixed16(interm_pbpl);
} else {
- interm_pbpl = DIV_ROUND_UP(wp->plane_bytes_per_line, 512) + 1;
+ interm_pbpl = DIV_ROUND_UP(wp->plane_bytes_per_line,
+ wp->dbuf_block_size) + 1;
wp->plane_blocks_per_line = u32_to_fixed16(interm_pbpl);
}

@@ -4515,7 +4527,7 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
latency += 15;

method1 = skl_wm_method1(dev_priv, wp->plane_pixel_rate,
- wp->cpp, latency);
+ wp->cpp, latency, wp->dbuf_block_size);
method2 = skl_wm_method2(wp->plane_pixel_rate,
cstate->base.adjusted_mode.crtc_htotal,
latency,
@@ -4525,7 +4537,8 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
selected_result = max_fixed16(method2, wp->y_tile_minimum);
} else {
if ((wp->cpp * cstate->base.adjusted_mode.crtc_htotal /
- 512 < 1) && (wp->plane_bytes_per_line / 512 < 1))
+ wp->dbuf_block_size < 1) &&
+ (wp->plane_bytes_per_line / wp->dbuf_block_size < 1))
selected_result = method2;
else if (ddb_allocation >=
fixed16_to_u32_round_up(wp->plane_blocks_per_line))
--
2.14.3