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From: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
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Date: Wed, 20 May 2015 16:32:34 +0300
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Subject: [PATCH] drm/i915: Fix ilk watermarks calculation when primary plane
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is disabled
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On Fedora 21 or 22, when the transition from the X server to the wayland
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compositor is done, the CRTC with the login screen is left active with a
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disabled fb. A cursor ioctl after the transition causes the watermarks
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to be updated, but due to the logic in intel_crtc_active() checking for
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the primary plane fb, the update considers all planes to be disabled,
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untimately setting the wrong watermark values and causing screen
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flicker. Since the crtc is active, a modeset done later is skipped and
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replaced with a flip, which doesn't update the watermarks.
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This regression was introduced somewhere between v3.16 and v3.17.
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Another issue prevented me from doing a full bisect, but the issue was
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introduced in one of the following skipped commits:
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commit 7707e6535f43328e05e4729ac96eee864b90e8a4
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Author: Rob Clark <robdclark@gmail.com>
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Date: Thu Jul 17 23:30:04 2014 -0400
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drm/i915: use helpers
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commit ca5a1b9ba0fb5291b555a23b76dbe5f6c30bfd7a
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Merge: c7dbc6c 3488229
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Author: Dave Airlie <airlied@redhat.com>
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Date: Wed Jul 9 10:38:42 2014 +1000
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Merge tag 'drm-intel-next-2014-06-20' of git://anongit.freedesktop.org/drm-intel into drm-next
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commit c51f71679042a5f388d9580ffbede14c897f1e86
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Merge: b957f45 7b3c29f
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Author: Dave Airlie <airlied@redhat.com>
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Date: Sat Jul 19 16:43:41 2014 +1000
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Merge tag 'drm-intel-next-2014-07-11' of git://anongit.freedesktop.org/drm-intel into drm-next
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This patch is a simplified version of the following commits:
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commit 3dd512fbda0d87d1c3fb44bf878b262baee98fb6
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Author: Matt Roper <matthew.d.roper@intel.com>
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Date: Fri Feb 27 10:12:00 2015 -0800
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drm/i915: Kill intel_crtc->cursor_{width, height} (v2)
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commit 54da691deb123c045259ebf4f5c67381244f58f1
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Author: Thomas Gummerer <t.gummerer@gmail.com>
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Date: Thu May 14 09:16:39 2015 +0200
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drm/i915: fix screen flickering
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commit 3ef00284e6a48f7deb0784ccca0478ebb7d4bcfc
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Author: Matt Roper <matthew.d.roper@intel.com>
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Date: Mon Mar 9 10:19:24 2015 -0700
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drm/i915: Use crtc->state->active in ilk/skl watermark calculations (v3)
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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90508
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1218688
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Cc: stable@vger.kernel.org
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Cc: Dave Airlie <airlied@gmail.com>
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Cc: Jani Nikula <jani.nikula@intel.com>
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Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
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---
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drivers/gpu/drm/i915/intel_pm.c | 14 +++++++++++---
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1 file changed, 11 insertions(+), 3 deletions(-)
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diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
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index 24d77ddcc5f4..3d67f8e496de 100644
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--- a/drivers/gpu/drm/i915/intel_pm.c
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+++ b/drivers/gpu/drm/i915/intel_pm.c
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@@ -1898,16 +1898,24 @@ static void ilk_compute_wm_parameters(struct drm_crtc *crtc,
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enum pipe pipe = intel_crtc->pipe;
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struct drm_plane *plane;
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- if (!intel_crtc_active(crtc))
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+ if (!intel_crtc->active)
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return;
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p->active = true;
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p->pipe_htotal = intel_crtc->config->base.adjusted_mode.crtc_htotal;
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p->pixel_rate = ilk_pipe_pixel_rate(dev, crtc);
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- p->pri.bytes_per_pixel = crtc->primary->fb->bits_per_pixel / 8;
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+
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+
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+ if (crtc->primary->fb)
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+ p->pri.bytes_per_pixel = crtc->primary->fb->bits_per_pixel / 8;
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+ else
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+ p->pri.bytes_per_pixel = 4;
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+
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p->cur.bytes_per_pixel = 4;
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+
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p->pri.horiz_pixels = intel_crtc->config->pipe_src_w;
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- p->cur.horiz_pixels = intel_crtc->cursor_width;
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+ p->cur.horiz_pixels = intel_crtc->base.cursor->state->crtc_w;
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+
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/* TODO: for now, assume primary and cursor planes are always enabled. */
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p->pri.enabled = true;
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p->cur.enabled = true;
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