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drm/i915: Complain if we take too long under vblank evasion. 

Instead of only complaining when we actually miss a vblank, always
complain if we take longer than 100 us. This will make it easier to
find cases where we potentially miss vblanks.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1488292128-14540-2-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[mlankhorst: Add commit message.]
This commit is contained in:
Maarten Lankhorst 2017-02-28 15:28:48 +01:00
parent 567f0792a6
commit e1edbd44e2
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/i915/intel_sprite.c
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@ -65,6 +65,8 @@ int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
1000 * adjusted_mode->crtc_htotal);
}
#define VBLANK_EVASION_TIME_US 100
/**
* intel_pipe_update_start() - start update of a set of display registers
* @crtc: the crtc of which the registers are going to be updated
@ -92,7 +94,8 @@ void intel_pipe_update_start(struct intel_crtc *crtc)
vblank_start = DIV_ROUND_UP(vblank_start, 2);
/* FIXME needs to be calibrated sensibly */
min = vblank_start - intel_usecs_to_scanlines(adjusted_mode, 100);
min = vblank_start - intel_usecs_to_scanlines(adjusted_mode,
VBLANK_EVASION_TIME_US);
max = vblank_start - 1;
local_irq_disable();
@ -191,7 +194,12 @@ void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work *work
ktime_us_delta(end_vbl_time, crtc->debug.start_vbl_time),
crtc->debug.min_vbl, crtc->debug.max_vbl,
crtc->debug.scanline_start, scanline_end);
}
} else if (ktime_us_delta(end_vbl_time, crtc->debug.start_vbl_time) >
VBLANK_EVASION_TIME_US)
DRM_WARN("Atomic update on pipe (%c) took %lld us, max time under evasion is %u us\n",
pipe_name(pipe),
ktime_us_delta(end_vbl_time, crtc->debug.start_vbl_time),
VBLANK_EVASION_TIME_US);
}
static void