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drm/i915: Print the watermark latencies during init

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Seeing the watermark latency values in dmesg might help sometimes.

v2: Use DRM_ERROR() when expected latency values are missing

Note: We might hit the DRM_ERROR added in this patch and apparently
there's not much we can do about that. But I think it'd be interesting
to figure out whether that actually happens in the real world, so I
didn't apply a s/DRM_ERROR/DRM_DEBUG_KMS/ bikeshed while applying.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
[danvet: Add note about new error dmesg output.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2013-08-01 16:18:52 +03:00 committed by Daniel Vetter
parent 5b77da33c1
commit 26ec971e30
1 changed files with 37 additions and 0 deletions
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37
drivers/gpu/drm/i915/intel_pm.c
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@ -2409,6 +2409,39 @@ static void intel_fixup_cur_wm_latency(struct drm_device *dev, uint16_t wm[5])
wm[3] *= 2;
}
static void intel_print_wm_latency(struct drm_device *dev,
const char *name,
const uint16_t wm[5])
{
int level, max_level;
/* how many WM levels are we expecting */
if (IS_HASWELL(dev))
max_level = 4;
else if (INTEL_INFO(dev)->gen >= 6)
max_level = 3;
else
max_level = 2;
for (level = 0; level <= max_level; level++) {
unsigned int latency = wm[level];
if (latency == 0) {
DRM_ERROR("%s WM%d latency not provided\n",
name, level);
continue;
}
/* WM1+ latency values in 0.5us units */
if (level > 0)
latency *= 5;
DRM_DEBUG_KMS("%s WM%d latency %u (%u.%u usec)\n",
name, level, wm[level],
latency / 10, latency % 10);
}
}
static void intel_setup_wm_latency(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -2422,6 +2455,10 @@ static void intel_setup_wm_latency(struct drm_device *dev)
intel_fixup_spr_wm_latency(dev, dev_priv->wm.spr_latency);
intel_fixup_cur_wm_latency(dev, dev_priv->wm.cur_latency);
intel_print_wm_latency(dev, "Primary", dev_priv->wm.pri_latency);
intel_print_wm_latency(dev, "Sprite", dev_priv->wm.spr_latency);
intel_print_wm_latency(dev, "Cursor", dev_priv->wm.cur_latency);
}
static void hsw_compute_wm_parameters(struct drm_device *dev,