@@ -114,6 +114,13 @@ typedef struct {
fp; \
})
+static inline bool is_fixed_16_16_zero(uint_fixed_16_16_t val)
+{
+ if (val.val == 0)
+ return true;
+ return false;
+}
+
static inline uint_fixed_16_16_t u32_to_fixed_16_16(uint32_t val)
{
uint_fixed_16_16_t fp;
@@ -3731,6 +3731,27 @@ static uint_fixed_16_16_t skl_wm_method2(uint32_t pixel_rate,
return ret;
}
+static uint_fixed_16_16_t
+skl_get_linetime_us(struct intel_crtc_state *cstate)
+{
+ uint32_t pixel_rate;
+ uint32_t crtc_htotal;
+ uint_fixed_16_16_t linetime_us;
+
+ if (!cstate->base.active)
+ return u32_to_fixed_16_16(0);
+
+ pixel_rate = cstate->pixel_rate;
+
+ if (WARN_ON(pixel_rate == 0))
+ return u32_to_fixed_16_16(0);
+
+ crtc_htotal = cstate->base.adjusted_mode.crtc_htotal;
+ linetime_us = fixed_16_16_div_u64(crtc_htotal * 1000, pixel_rate);
+
+ return linetime_us;
+}
+
static uint32_t skl_adjusted_plane_pixel_rate(const struct intel_crtc_state *cstate,
const struct intel_plane_state *pstate)
{
@@ -3864,12 +3885,18 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
if (y_tiled) {
selected_result = max_fixed_16_16(method2, y_tile_minimum);
} else {
+ uint32_t linetime_us;
+
+ linetime_us = fixed_16_16_to_u32_round_up(
+ skl_get_linetime_us(cstate));
if ((cpp * cstate->base.adjusted_mode.crtc_htotal / 512 < 1) &&
(plane_bytes_per_line / 512 < 1))
selected_result = method2;
- else if ((ddb_allocation /
+ else if ((ddb_allocation && ddb_allocation /
fixed_16_16_to_u32_round_up(plane_blocks_per_line)) >= 1)
selected_result = min_fixed_16_16(method1, method2);
+ else if (latency >= linetime_us)
+ selected_result = method2;
else
selected_result = method1;
}
@@ -3957,19 +3984,16 @@ skl_compute_linetime_wm(struct intel_crtc_state *cstate)
{
struct drm_atomic_state *state = cstate->base.state;
struct drm_i915_private *dev_priv = to_i915(state->dev);
- uint32_t pixel_rate;
+ uint_fixed_16_16_t linetime_us;
uint32_t linetime_wm;
- if (!cstate->base.active)
- return 0;
+ linetime_us = skl_get_linetime_us(cstate);
- pixel_rate = cstate->pixel_rate;
-
- if (WARN_ON(pixel_rate == 0))
+ if (is_fixed_16_16_zero(linetime_us))
return 0;
- linetime_wm = DIV_ROUND_UP(8 * cstate->base.adjusted_mode.crtc_htotal *
- 1000, pixel_rate);
+ linetime_wm = fixed_16_16_to_u32_round_up(mul_u32_fixed_16_16(8,
+ linetime_us));
/* Display WA #1135: bxt. */
if (IS_BROXTON(dev_priv) && dev_priv->ipc_enabled)
This patch make changes to use linetime latency if allocated DDB size during plane watermark calculation is not available, This is required to implement new DDB allocation algorithm. In New Algorithm DDB is allocated based on WM values, because of which number of DDB blocks will not be available during WM calculation, So this "linetime latency" is suggested by SV/HW team to be used during switch-case for WM blocks selection. Changes since v1: - Rebase on top of Paulo's patch series Changes since v2: - Fix if-else condition (pointed by Maarten) Changes since v3: - Use common function for timetime_us calculation (Paulo) - rebase on drm-tip Signed-off-by: "Mahesh Kumar" <mahesh1.kumar@intel.com> --- drivers/gpu/drm/i915/i915_drv.h | 7 +++++++ drivers/gpu/drm/i915/intel_pm.c | 42 ++++++++++++++++++++++++++++++++--------- 2 files changed, 40 insertions(+), 9 deletions(-)