From: Maarten Lankhorst Date: Wed, 31 May 2017 15:42:36 +0000 (+0200) Subject: drm/i915: Always recompute watermarks when distrust_bios_wm is set, v2. X-Git-Tag: v5.15~6763^2~28^2~3334 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=367d73d2806085bb507ab44c1f532640917fd5ca;p=platform%2Fkernel%2Flinux-starfive.git drm/i915: Always recompute watermarks when distrust_bios_wm is set, v2. On some systems there can be a race condition in which no crtc state is added to the first atomic commit. This results in all crtc's having a null DDB allocation, causing a FIFO underrun on any update until the first modeset. Changes since v1: - Do not take the connection_mutex, this is already done below. Reported-by: Maarten Lankhorst Inspired-by: Mahesh Kumar Signed-off-by: Maarten Lankhorst Fixes: 98d39494d375 ("drm/i915/gen9: Compute DDB allocation at atomic check time (v4)") Cc: # v4.8+ Cc: Mahesh Kumar Cc: Matt Roper Link: http://patchwork.freedesktop.org/patch/msgid/20170531154236.27180-1-maarten.lankhorst@linux.intel.com Reviewed-by: Mahesh Kumar Reviewed-by: Matt Roper --- diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 936eef1..fce4bc5 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4819,11 +4819,19 @@ skl_compute_wm(struct drm_atomic_state *state) struct drm_crtc_state *cstate; struct intel_atomic_state *intel_state = to_intel_atomic_state(state); struct skl_wm_values *results = &intel_state->wm_results; + struct drm_device *dev = state->dev; struct skl_pipe_wm *pipe_wm; bool changed = false; int ret, i; /* + * When we distrust bios wm we always need to recompute to set the + * expected DDB allocations for each CRTC. + */ + if (to_i915(dev)->wm.distrust_bios_wm) + changed = true; + + /* * If this transaction isn't actually touching any CRTC's, don't * bother with watermark calculation. Note that if we pass this * test, we're guaranteed to hold at least one CRTC state mutex, @@ -4833,6 +4841,7 @@ skl_compute_wm(struct drm_atomic_state *state) */ for_each_new_crtc_in_state(state, crtc, cstate, i) changed = true; + if (!changed) return 0;