diff options
| author | Mika Kuoppala <mika.kuoppala@linux.intel.com> | 2015-07-16 19:36:51 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-07-17 10:06:40 +0300 |
| commit | 661abfc028886eb1c6b5b9dbc433ef8cfb11217d (patch) | |
| tree | cef34dd59093046aebc551b5a29ab5f21ac8dbd4 /drivers/gpu/drm/i915/intel_pm.c | |
| parent | 264954811af62dcfe17fc44cef379b315bb066eb (diff) | |
| download | linux-661abfc028886eb1c6b5b9dbc433ef8cfb11217d.tar.xz | |
drm/i915: Fix divide by zero on watermark update
Fix divide by zero if we end up updating the watermarks
with zero dotclock.
This is a stop gap measure to allow module load in cases
where our state keeping fails.
v2: WARN_ON added (Paulo)
Cc: Paulo Zanoni <przanoni@gmail.com>
Cc: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 5eeddc97ca2a..0d3e01434860 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3316,8 +3316,10 @@ skl_compute_linetime_wm(struct drm_crtc *crtc, struct skl_pipe_wm_parameters *p) if (!to_intel_crtc(crtc)->active) return 0; - return DIV_ROUND_UP(8 * p->pipe_htotal * 1000, p->pixel_rate); + if (WARN_ON(p->pixel_rate == 0)) + return 0; + return DIV_ROUND_UP(8 * p->pipe_htotal * 1000, p->pixel_rate); } static void skl_compute_transition_wm(struct drm_crtc *crtc, |