>-----Original Message-----
>From: Shaikh, Azhar
>Sent: Friday, July 6, 2018 11:28 AM
>To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
>Cc: ville.syrjala@xxxxxxxxxxxxxxx; Navare, Manasi D
><manasi.d.navare@xxxxxxxxx>; Shaikh, Azhar <azhar.shaikh@xxxxxxxxx>
>Subject: [PATCH v7] drm/i915: Fix assert_plane() warning on bootup with
>external display
>
>On KBL, WHL RVPs, booting up with an external display connected, triggers
>below warning, when the BiOS brings up the external display too.
>This warning is not seen during hotplug.
>
>[ 3.615226] ------------[ cut here ]------------
>[ 3.619829] plane 1A assertion failure (expected on, current off)
>[ 3.632039] WARNING: CPU: 2 PID: 354 at
>drivers/gpu/drm/i915/intel_display.c:1294 assert_plane+0x71/0xbb
>[ 3.633920] iwlwifi 0000:00:14.3: loaded firmware version 38.c0e03d94.0
>op_mode iwlmvm
>[ 3.647157] Modules linked in: iwlwifi cfg80211 btusb btrtl btbcm btintel
>bluetooth ecdh_generic
>[ 3.647163] CPU: 2 PID: 354 Comm: frecon Not tainted 4.17.0-rc7-50176-
>g655af12d39c2 #3
>[ 3.647165] Hardware name: Intel Corporation CoffeeLake Client
>Platform/WhiskeyLake U DDR4 ERB, BIOS
>CNLSFWR1.R00.X140.B00.1804040304 04/04/2018
>[ 3.684509] RIP: 0010:assert_plane+0x71/0xbb
>[ 3.764451] Call Trace:
>[ 3.766888] intel_atomic_commit_tail+0xa97/0xb77
>[ 3.771569] intel_atomic_commit+0x26a/0x279
>[ 3.771572] drm_atomic_helper_set_config+0x5c/0x76
>[ 3.780670] __drm_mode_set_config_internal+0x66/0x109
>[ 3.780672] drm_mode_setcrtc+0x4c9/0x5cc
>[ 3.780674] ? drm_mode_getcrtc+0x162/0x162
>[ 3.789774] ? drm_mode_getcrtc+0x162/0x162
>[ 3.798108] drm_ioctl_kernel+0x8d/0xe4
>[ 3.801926] drm_ioctl+0x27d/0x368
>[ 3.805311] ? drm_mode_getcrtc+0x162/0x162
>[ 3.805314] ? selinux_file_ioctl+0x14e/0x199
>[ 3.805317] vfs_ioctl+0x21/0x2f
>[ 3.813812] do_vfs_ioctl+0x491/0x4b4
>[ 3.813813] ? security_file_ioctl+0x37/0x4b
>[ 3.813816] ksys_ioctl+0x55/0x75
>[ 3.820672] __x64_sys_ioctl+0x1a/0x1e
>[ 3.820674] do_syscall_64+0x51/0x5f
>[ 3.820678] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>[ 3.828221] RIP: 0033:0x7b5e04953967
>[ 3.835504] RSP: 002b:00007fff2eafb6f8 EFLAGS: 00000246 ORIG_RAX:
>0000000000000010
>[ 3.835505] RAX: ffffffffffffffda RBX: 0000000000000002 RCX:
>00007b5e04953967
>[ 3.835505] RDX: 00007fff2eafb730 RSI: 00000000c06864a2 RDI:
>000000000000000f
>[ 3.835506] RBP: 00007fff2eafb720 R08: 0000000000000000 R09:
>0000000000000000
>[ 3.835507] R10: 0000000000000070 R11: 0000000000000246 R12:
>000000000000000f
>[ 3.879988] R13: 000056bc9dd7d210 R14: 00007fff2eafb730 R15:
>00000000c06864a2
>[ 3.887081] Code: 48 c7 c7 06 71 a5 be 84 c0 48 c7 c2 06 fd a3 be 48 89 f9 48 0f
>44 ca 84 db 48 0f 45 d7 48 c7 c7 df d3 a4 be 31 c0 e8 af a0 c0 ff <0f> 0b eb 2b 48
>c7 c7 06 fd a3 be 84 c0 48 c7 c2 06 71 a5 be 48
>[ 3.905845] WARNING: CPU: 2 PID: 354 at
>drivers/gpu/drm/i915/intel_display.c:1294 assert_plane+0x71/0xbb
>[ 3.920964] ---[ end trace dac692f4ac46391a ]---
>
>The warning is seen when mode_setcrtc() is called for pipeB during bootup
>and before we get a mode_setcrtc() for pipeA, while doing update_crtcs() in
>intel_atomic_commit_tail().
>Now since, plane1A is still active after commit, update_crtcs() is done for
>pipeA and eventually update_plane() for plane1A.
>
>intel_plane_state->ctl for plane1A is not updated since set_modecrtc() is
>called for pipeB. So intel_plane_state->ctl for plane 1A will be 0x0.
>So doing an update_plane() for plane1A, will result in clearing
>PLANE_CTL_ENABLE bit, and hence the warning.
>
>To fix this warning, force all active planes to recompute their states in probe.
>
>Changes in v7:
>- Move call to intel_initial_commit() after sanitize_watermarks()
> Otherwise the plane update will still consult potentially bogus
> watermarks we read out from the hardware. (Ville)
>- Carry Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> from v6
>
>Changes in v6:
>- Handle EDEADLK for drm_atomic_get_crtc_state() and
> drm_atomic_add_affected_planes()
>- Remove optimization of calling intel_initial_commit()
> only when there is more than one active pipe in probe.
>- Avoid using intel_ types.
>
>Changes in v5:
>- Drop drm_modeset_lock_all_ctx() since locks will be taken later.
>
>Changes in v4:
>- Handle locking in intel_initial_commit()
>- Move the for loop inside intel_initial_commit() so that
> drm_atomic_commit() is called only once
>- Call intel_initial_commit() only for more than one active crtc on boot.
>- Save the return value of intel_initial_commit() and print a message in
> case of an error
>
>Changes in v3:
>- Add comments
>
>Changes in v2:
>- Force all planes to recompute their states.(Ville Syrjälä)
>- Update the commit message
>
>Signed-off-by: Azhar Shaikh <azhar.shaikh@xxxxxxxxx>
Forgot adding Reviewed-by..
Please ignore this patch.
>---
> drivers/gpu/drm/i915/intel_display.c | 61
>++++++++++++++++++++++++++++++++++--
> 1 file changed, 59 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/intel_display.c
>b/drivers/gpu/drm/i915/intel_display.c
>index 56818a45181c..1a3850df7ed3 100644
>--- a/drivers/gpu/drm/i915/intel_display.c
>+++ b/drivers/gpu/drm/i915/intel_display.c
>@@ -15092,12 +15092,61 @@ static void intel_update_fdi_pll_freq(struct
>drm_i915_private *dev_priv)
> DRM_DEBUG_DRIVER("FDI PLL freq=%d\n", dev_priv->fdi_pll_freq);
>}
>
>+static int intel_initial_commit(struct drm_device *dev) {
>+ struct drm_atomic_state *state = NULL;
>+ struct drm_modeset_acquire_ctx ctx;
>+ struct drm_crtc *crtc;
>+ struct drm_crtc_state *crtc_state;
>+ int ret = 0;
>+
>+ state = drm_atomic_state_alloc(dev);
>+ if (!state)
>+ return -ENOMEM;
>+
>+ drm_modeset_acquire_init(&ctx, 0);
>+
>+retry:
>+ state->acquire_ctx = &ctx;
>+
>+ drm_for_each_crtc(crtc, dev) {
>+ crtc_state = drm_atomic_get_crtc_state(state, crtc);
>+ if (IS_ERR(crtc_state)) {
>+ ret = PTR_ERR(crtc_state);
>+ goto out;
>+ }
>+
>+ if (crtc_state->active) {
>+ ret = drm_atomic_add_affected_planes(state, crtc);
>+ if (ret)
>+ goto out;
>+ }
>+ }
>+
>+ ret = drm_atomic_commit(state);
>+
>+out:
>+ if (ret == -EDEADLK) {
>+ drm_atomic_state_clear(state);
>+ drm_modeset_backoff(&ctx);
>+ goto retry;
>+ }
>+
>+ drm_atomic_state_put(state);
>+
>+ drm_modeset_drop_locks(&ctx);
>+ drm_modeset_acquire_fini(&ctx);
>+
>+ return ret;
>+}
>+
> int intel_modeset_init(struct drm_device *dev) {
> struct drm_i915_private *dev_priv = to_i915(dev);
> struct i915_ggtt *ggtt = &dev_priv->ggtt;
> enum pipe pipe;
> struct intel_crtc *crtc;
>+ int ret;
>
> dev_priv->modeset_wq =
>alloc_ordered_workqueue("i915_modeset", 0);
>
>@@ -15172,8 +15221,6 @@ int intel_modeset_init(struct drm_device *dev)
> INTEL_INFO(dev_priv)->num_pipes > 1 ? "s" : "");
>
> for_each_pipe(dev_priv, pipe) {
>- int ret;
>-
> ret = intel_crtc_init(dev_priv, pipe);
> if (ret) {
> drm_mode_config_cleanup(dev);
>@@ -15229,6 +15276,16 @@ int intel_modeset_init(struct drm_device *dev)
> if (!HAS_GMCH_DISPLAY(dev_priv))
> sanitize_watermarks(dev);
>
>+ /*
>+ * Force all active planes to recompute their states. So that on
>+ * mode_setcrtc after probe, all the intel_plane_state variables
>+ * are already calculated and there is no assert_plane warnings
>+ * during bootup.
>+ */
>+ ret = intel_initial_commit(dev);
>+ if (ret)
>+ DRM_DEBUG_KMS("Initial commit in probe failed.\n");
>+
> return 0;
> }
>
>--
>1.9.1
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