From 9b6130227495fdaf17f8b3b28db083666b113c84 Mon Sep 17 00:00:00 2001 From: Matt Roper Date: Mon, 27 Jun 2016 16:42:44 -0700 Subject: [PATCH] drm/i915/gen9: Re-allocate DDB only for changed pipes When a display update triggers a DDB re-allocation, we should start by assuming that only the updated pipes need to be re-allocated (we have logic later that may add additional pipes if, e.g., a modeset triggers a change to the global allocation). We were erroneously using the _active_ pipes as our starting point rather than the changed pipes. This causes us to grab CRTC locks that we didn't actually need, reducing parallelism. Given the recent non-blocking atomic changes, it also causes legacy pageflips against one CRTC to return -EBUSY if there's an outstanding pageflip against a different CRTC (a situation easily triggered via compositors like Weston). Fixes: 98d39494d3 ("drm/i915/gen9: Compute DDB allocation at atomic check time (v4)") Cc: Maarten Lankhorst Signed-off-by: Matt Roper Link: http://patchwork.freedesktop.org/patch/msgid/1467070964-14864-1-git-send-email-matthew.d.roper@intel.com Reviewed-by: Maarten Lankhorst --- drivers/gpu/drm/i915/intel_pm.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index c94521cc476c..d7f8ba89d2a5 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3879,6 +3879,19 @@ static int skl_update_pipe_wm(struct drm_crtc_state *cstate, return 0; } +static uint32_t +pipes_modified(struct drm_atomic_state *state) +{ + struct drm_crtc *crtc; + struct drm_crtc_state *cstate; + uint32_t i, ret = 0; + + for_each_crtc_in_state(state, crtc, cstate, i) + ret |= drm_crtc_mask(crtc); + + return ret; +} + static int skl_compute_ddb(struct drm_atomic_state *state) { @@ -3887,7 +3900,7 @@ skl_compute_ddb(struct drm_atomic_state *state) struct intel_atomic_state *intel_state = to_intel_atomic_state(state); struct intel_crtc *intel_crtc; struct skl_ddb_allocation *ddb = &intel_state->wm_results.ddb; - unsigned realloc_pipes = dev_priv->active_crtcs; + uint32_t realloc_pipes = pipes_modified(state); int ret; /* -- 2.20.1