From 8de9b311bcd117a97998574705829bd48bfa2971 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 19 Jul 2010 19:59:52 +0100 Subject: [PATCH] drm/i915: Round up the watermark entries (v3) Even though "we have enough padding that it should be ok", round up the watermark entries to the next unit to be on the safe side... v2: Use the DIV_ROUND_UP macro v3: Spotted a few more missing round-ups. Signed-off-by: Chris Wilson Cc: Jesse Barnes Signed-off-by: Eric Anholt --- drivers/gpu/drm/i915/intel_display.c | 44 +++++++++++++--------------- 1 file changed, 20 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index ce96c3aea162..baaaeaac7f21 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -2734,7 +2734,7 @@ static unsigned long intel_calculate_wm(unsigned long clock_in_khz, */ entries_required = ((clock_in_khz / 1000) * pixel_size * latency_ns) / 1000; - entries_required /= wm->cacheline_size; + entries_required = DIV_ROUND_UP(entries_required, wm->cacheline_size); DRM_DEBUG_KMS("FIFO entries required for mode: %d\n", entries_required); @@ -2855,11 +2855,9 @@ static int i9xx_get_fifo_size(struct drm_device *dev, int plane) uint32_t dsparb = I915_READ(DSPARB); int size; - if (plane == 0) - size = dsparb & 0x7f; - else - size = ((dsparb >> DSPARB_CSTART_SHIFT) & 0x7f) - - (dsparb & 0x7f); + size = dsparb & 0x7f; + if (plane) + size = ((dsparb >> DSPARB_CSTART_SHIFT) & 0x7f) - size; DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb, plane ? "B" : "A", size); @@ -2873,11 +2871,9 @@ static int i85x_get_fifo_size(struct drm_device *dev, int plane) uint32_t dsparb = I915_READ(DSPARB); int size; - if (plane == 0) - size = dsparb & 0x1ff; - else - size = ((dsparb >> DSPARB_BEND_SHIFT) & 0x1ff) - - (dsparb & 0x1ff); + size = dsparb & 0x1ff; + if (plane) + size = ((dsparb >> DSPARB_BEND_SHIFT) & 0x1ff) - size; size >>= 1; /* Convert to cachelines */ DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb, @@ -3009,12 +3005,12 @@ static void g4x_update_wm(struct drm_device *dev, int planea_clock, */ entries_required = ((planea_clock / 1000) * pixel_size * latency_ns) / 1000; - entries_required /= G4X_FIFO_LINE_SIZE; + entries_required = DIV_ROUND_UP(entries_required, G4X_FIFO_LINE_SIZE); planea_wm = entries_required + planea_params.guard_size; entries_required = ((planeb_clock / 1000) * pixel_size * latency_ns) / 1000; - entries_required /= G4X_FIFO_LINE_SIZE; + entries_required = DIV_ROUND_UP(entries_required, G4X_FIFO_LINE_SIZE); planeb_wm = entries_required + planeb_params.guard_size; cursora_wm = cursorb_wm = 16; @@ -3033,12 +3029,12 @@ static void g4x_update_wm(struct drm_device *dev, int planea_clock, /* Use ns/us then divide to preserve precision */ sr_entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) * pixel_size * sr_hdisplay; - sr_entries = roundup(sr_entries / cacheline_size, 1); + sr_entries = DIV_ROUND_UP(sr_entries, cacheline_size); entries_required = (((sr_latency_ns / line_time_us) + 1000) / 1000) * pixel_size * 64; - entries_required = roundup(entries_required / - g4x_cursor_wm_info.cacheline_size, 1); + entries_required = DIV_ROUND_UP(entries_required, + g4x_cursor_wm_info.cacheline_size); cursor_sr = entries_required + g4x_cursor_wm_info.guard_size; if (cursor_sr > g4x_cursor_wm_info.max_wm) @@ -3089,7 +3085,7 @@ static void i965_update_wm(struct drm_device *dev, int planea_clock, /* Use ns/us then divide to preserve precision */ sr_entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) * pixel_size * sr_hdisplay; - sr_entries = roundup(sr_entries / I915_FIFO_LINE_SIZE, 1); + sr_entries = DIV_ROUND_UP(sr_entries, I915_FIFO_LINE_SIZE); DRM_DEBUG("self-refresh entries: %d\n", sr_entries); srwm = I965_FIFO_SIZE - sr_entries; if (srwm < 0) @@ -3098,8 +3094,8 @@ static void i965_update_wm(struct drm_device *dev, int planea_clock, sr_entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) * pixel_size * 64; - sr_entries = roundup(sr_entries / - i965_cursor_wm_info.cacheline_size, 1); + sr_entries = DIV_ROUND_UP(sr_entries, + i965_cursor_wm_info.cacheline_size); cursor_sr = i965_cursor_wm_info.fifo_size - (sr_entries + i965_cursor_wm_info.guard_size); @@ -3181,7 +3177,7 @@ static void i9xx_update_wm(struct drm_device *dev, int planea_clock, /* Use ns/us then divide to preserve precision */ sr_entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) * pixel_size * sr_hdisplay; - sr_entries = roundup(sr_entries / cacheline_size, 1); + sr_entries = DIV_ROUND_UP(sr_entries, cacheline_size); DRM_DEBUG_KMS("self-refresh entries: %d\n", sr_entries); srwm = total_size - sr_entries; if (srwm < 0) @@ -3270,7 +3266,7 @@ static void ironlake_update_wm(struct drm_device *dev, int planea_clock, entries_required = ((planea_clock / 1000) * pixel_size * ILK_LP0_PLANE_LATENCY) / 1000; entries_required = DIV_ROUND_UP(entries_required, - ironlake_display_wm_info.cacheline_size); + ironlake_display_wm_info.cacheline_size); planea_wm = entries_required + ironlake_display_wm_info.guard_size; @@ -3304,7 +3300,7 @@ static void ironlake_update_wm(struct drm_device *dev, int planea_clock, entries_required = ((planeb_clock / 1000) * pixel_size * ILK_LP0_PLANE_LATENCY) / 1000; entries_required = DIV_ROUND_UP(entries_required, - ironlake_display_wm_info.cacheline_size); + ironlake_display_wm_info.cacheline_size); planeb_wm = entries_required + ironlake_display_wm_info.guard_size; @@ -3353,14 +3349,14 @@ static void ironlake_update_wm(struct drm_device *dev, int planea_clock, /* calculate the self-refresh watermark for display plane */ entries_required = line_count * sr_hdisplay * pixel_size; entries_required = DIV_ROUND_UP(entries_required, - ironlake_display_srwm_info.cacheline_size); + ironlake_display_srwm_info.cacheline_size); sr_wm = entries_required + ironlake_display_srwm_info.guard_size; /* calculate the self-refresh watermark for display cursor */ entries_required = line_count * pixel_size * 64; entries_required = DIV_ROUND_UP(entries_required, - ironlake_cursor_srwm_info.cacheline_size); + ironlake_cursor_srwm_info.cacheline_size); cursor_wm = entries_required + ironlake_cursor_srwm_info.guard_size; -- 2.39.5