From f818ffea87bb7ee4eb8813eb6258778c5460db2e Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 29 Apr 2016 17:31:18 +0300 Subject: [PATCH] drm/i915: Add a FIXME about crtc !active vs. watermarks MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When the crtc is enabled but !active, we should still compute the watermarks as if the planes were visible. That would make it more likely that the we can later transition to active without errors. Add a FIXME to remind people that we're doing the wrong thing now. We should perhaps just move the wm computation for each individual plane into the .check_plane hook, and later we'd just combine the results from all active planes. Cc: Maarten Lankhorst Cc: Matt Roper Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1461940278-17122-2-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Daniel Vetter Reviewed-by: Maarten Lankhorst --- drivers/gpu/drm/i915/intel_display.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index a8f5d035941b..d3f6e58c199e 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -11823,6 +11823,11 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state, * Visibility is calculated as if the crtc was on, but * after scaler setup everything depends on it being off * when the crtc isn't active. + * + * FIXME this is wrong for watermarks. Watermarks should also + * be computed as if the pipe would be active. Perhaps move + * per-plane wm computation to the .check_plane() hook, and + * only combine the results from all planes in the current place? */ if (!is_crtc_enabled) to_intel_plane_state(plane_state)->visible = visible = false; -- 2.30.2