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drm/i915/gen9: fix the watermark res_blocks value

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We forgot the "res_blocks += y_tile_minimum" that's described on step
V of our documentation.

Again, this should only affect the Y tiling cases.

It looks like the relevant code was introduced in 0fda65680e, but
there's always the possibility that it matched our specification when
it was introduced, and then the specification changed while the code
stayed the same. So we can't really say this was a regression, but
let's try to add a "Fixes" tag anyway to help backporting.

v2: Try to add a "Fixes" tag (Maarten).

Fixes: 0fda65680e ("drm/i915/skl: Update watermarks for Y tiling")
Cc: stable@vger.kernel.org
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Lyude <cpaul@redhat.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1474578035-424-8-git-send-email-paulo.r.zanoni@intel.com
This commit is contained in:
Paulo Zanoni 2016-09-22 18:00:33 -03:00
parent 7a1a8aed67
commit 75676ed423
1 changed files with 7 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/i915/intel_pm.c
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@ -3552,7 +3552,7 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
uint8_t cpp;
uint32_t width = 0, height = 0;
uint32_t plane_pixel_rate;
uint32_t y_min_scanlines;
uint32_t y_tile_minimum, y_min_scanlines;
if (latency == 0 || !cstate->base.active || !intel_pstate->base.visible) {
*enabled = false;
@ -3609,10 +3609,10 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
latency,
plane_blocks_per_line);
y_tile_minimum = plane_blocks_per_line * y_min_scanlines;
if (fb->modifier[0] == I915_FORMAT_MOD_Y_TILED ||
fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED) {
uint32_t y_tile_minimum = plane_blocks_per_line *
y_min_scanlines;
selected_result = max(method2, y_tile_minimum);
} else {
if ((ddb_allocation / plane_blocks_per_line) >= 1)
@ -3626,10 +3626,12 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
if (level >= 1 && level <= 7) {
if (fb->modifier[0] == I915_FORMAT_MOD_Y_TILED ||
fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED)
fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED) {
res_blocks += y_tile_minimum;
res_lines += y_min_scanlines;
else
} else {
res_blocks++;
}
}
if (res_blocks >= ddb_allocation || res_lines > 31) {