drm/i915: Fix POWER_DOMAIN_AUDIO refcounting.

If the crtc was brought up with audio before the driver loads,
then crtc_disable will remove a refcount to audio that doesn't exist
before.

Fortunately we already set power domains on readout, so we can just add
the power domain handling to get_crtc_power_domains, which will update
the power domains correctly in all cases.

This was found when testing module reload on CI with the crtc enabled,
which resulted in the following warn after module reload + modeset:

[   24.197041] ------------[ cut here ]------------
[   24.197075] WARNING: CPU: 0 PID: 99 at drivers/gpu/drm/i915/intel_runtime_pm.c:1790 intel_display_power_put+0x134/0x140 [i915]
[   24.197076] Use count on domain AUDIO is already zero
[   24.197098] CPU: 0 PID: 99 Comm: kworker/u8:2 Not tainted 4.9.0-CI-Trybot_393+ #1
[   24.197099] Hardware name:                  /NUC6i5SYB, BIOS SYSKLi35.86A.0042.2016.0409.1246 04/09/2016
[   24.197102] Workqueue: events_unbound async_run_entry_fn
[   24.197105]  ffffc900003c7688 ffffffff81435b35 ffffc900003c76d8 0000000000000000
[   24.197107]  ffffc900003c76c8 ffffffff8107e4d6 000006fe5dc36f28 ffff88025dc30054
[   24.197109]  ffff88025dc36f28 ffff88025dc30000 ffff88025dc30000 0000000000000015
[   24.197110] Call Trace:
[   24.197113]  [<ffffffff81435b35>] dump_stack+0x67/0x92
[   24.197116]  [<ffffffff8107e4d6>] __warn+0xc6/0xe0
[   24.197118]  [<ffffffff8107e53a>] warn_slowpath_fmt+0x4a/0x50
[   24.197149]  [<ffffffffa039b4b4>] intel_display_power_put+0x134/0x140 [i915]
[   24.197187]  [<ffffffffa04217dd>] intel_disable_ddi+0x4d/0x80 [i915]
[   24.197223]  [<ffffffffa03f388f>] intel_encoders_disable.isra.74+0x7f/0x90 [i915]
[   24.197257]  [<ffffffffa03f6c05>] haswell_crtc_disable+0x55/0x170 [i915]
[   24.197292]  [<ffffffffa03fec88>] intel_atomic_commit_tail+0x108/0xfd0 [i915]
[   24.197295]  [<ffffffff810d47c6>] ? __lock_is_held+0x66/0x90
[   24.197330]  [<ffffffffa03fff79>] intel_atomic_commit+0x429/0x560 [i915]
[   24.197332]  [<ffffffff81570186>] ?drm_atomic_add_affected_connectors+0x56/0xf0
[   24.197334]  [<ffffffff8156f726>] drm_atomic_commit+0x46/0x50
[   24.197336]  [<ffffffff81553f87>] restore_fbdev_mode+0x147/0x270
[   24.197337]  [<ffffffff81555bee>] drm_fb_helper_restore_fbdev_mode_unlocked+0x2e/0x70
[   24.197339]  [<ffffffff81555aa8>] drm_fb_helper_set_par+0x28/0x50
[   24.197374]  [<ffffffffa041c7d3>] intel_fbdev_set_par+0x13/0x70 [i915]
[   24.197376]  [<ffffffff8149e07a>] fbcon_init+0x57a/0x600
[   24.197379]  [<ffffffff81514b71>] visual_init+0xd1/0x130
[   24.197381]  [<ffffffff8151603c>] do_bind_con_driver+0x1bc/0x3a0
[   24.197384]  [<ffffffff81516521>] do_take_over_console+0x111/0x180
[   24.197386]  [<ffffffff8149e152>] do_fbcon_takeover+0x52/0xb0
[   24.197387]  [<ffffffff814a12c3>] fbcon_event_notify+0x723/0x850
[   24.197390]  [<ffffffff810a4830>] ?__blocking_notifier_call_chain+0x30/0x70
[   24.197392]  [<ffffffff810a44a4>] notifier_call_chain+0x34/0xa0
[   24.197394]  [<ffffffff810a4848>] __blocking_notifier_call_chain+0x48/0x70
[   24.197397]  [<ffffffff810a4881>] blocking_notifier_call_chain+0x11/0x20
[   24.197398]  [<ffffffff814a4556>] fb_notifier_call_chain+0x16/0x20
[   24.197400]  [<ffffffff814a678c>] register_framebuffer+0x24c/0x330
[   24.197402]  [<ffffffff815558d9>] drm_fb_helper_initial_config+0x219/0x3c0
[   24.197436]  [<ffffffffa041d373>] intel_fbdev_initial_config+0x13/0x30 [i915]
[   24.197438]  [<ffffffff810a5d44>] async_run_entry_fn+0x34/0x140
[   24.197440]  [<ffffffff8109c26c>] process_one_work+0x1ec/0x6b0
[   24.197442]  [<ffffffff8109c1e6>] ? process_one_work+0x166/0x6b0
[   24.197445]  [<ffffffff8109c779>] worker_thread+0x49/0x490
[   24.197447]  [<ffffffff8109c730>] ? process_one_work+0x6b0/0x6b0
[   24.197448]  [<ffffffff810a2a9b>] kthread+0xeb/0x110
[   24.197451]  [<ffffffff810a29b0>] ? kthread_park+0x60/0x60
[   24.197453]  [<ffffffff818241a7>] ret_from_fork+0x27/0x40
[   24.197476] ---[ end trace bda64b683b8e8162 ]---

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1481812185-19098-3-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 9a9a670f85494522c9f3e43600eba887b3899df0..d957211c76ad71d2b3784136b1a4a90377f823d8 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1835,8 +1835,6 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
                             struct drm_connector_state *conn_state)
 {
        struct drm_encoder *encoder = &intel_encoder->base;
-       struct drm_crtc *crtc = encoder->crtc;
-       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct drm_i915_private *dev_priv = to_i915(encoder->dev);
        enum port port = intel_ddi_get_encoder_port(intel_encoder);
        int type = intel_encoder->type;
@@ -1863,10 +1861,8 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
                intel_edp_drrs_enable(intel_dp, pipe_config);
        }
 
-       if (intel_crtc->config->has_audio) {
-               intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
+       if (pipe_config->has_audio)
                intel_audio_codec_enable(intel_encoder, pipe_config, conn_state);
-       }
 }
 
 static void intel_disable_ddi(struct intel_encoder *intel_encoder,
@@ -1874,16 +1870,10 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder,
                              struct drm_connector_state *old_conn_state)
 {
        struct drm_encoder *encoder = &intel_encoder->base;
-       struct drm_crtc *crtc = encoder->crtc;
-       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int type = intel_encoder->type;
-       struct drm_device *dev = encoder->dev;
-       struct drm_i915_private *dev_priv = to_i915(dev);
 
-       if (intel_crtc->config->has_audio) {
+       if (old_crtc_state->has_audio)
                intel_audio_codec_disable(intel_encoder);
-               intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
-       }
 
        if (type == INTEL_OUTPUT_EDP) {
                struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b44e9466d394a0b5bc7faed9b150daf77842c258..88689a0b4183e70cf481ba5fd5e595c2a9c41cfc 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5730,6 +5730,7 @@ static unsigned long get_crtc_power_domains(struct drm_crtc *crtc,
                                            struct intel_crtc_state *crtc_state)
 {
        struct drm_device *dev = crtc->dev;
+       struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_encoder *encoder;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum pipe pipe = intel_crtc->pipe;
@@ -5751,6 +5752,9 @@ static unsigned long get_crtc_power_domains(struct drm_crtc *crtc,
                mask |= BIT(intel_display_port_power_domain(intel_encoder));
        }
 
+       if (HAS_DDI(dev_priv) && crtc_state->has_audio)
+               mask |= BIT(POWER_DOMAIN_AUDIO);
+
        if (crtc_state->shared_dpll)
                mask |= BIT(POWER_DOMAIN_PLLS);
 

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 95267fcef71b08726f01ac651b4a6aea7276b765..6a85d388f9363ac4000abd0615c37d7dfa4b3d65 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -92,7 +92,6 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder,
        struct intel_dp *intel_dp = &intel_dig_port->dp;
        struct intel_connector *connector =
                to_intel_connector(old_conn_state->connector);
-       struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        int ret;
 
        DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
@@ -103,10 +102,8 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder,
        if (ret) {
                DRM_ERROR("failed to update payload %d\n", ret);
        }
-       if (old_crtc_state->has_audio) {
+       if (old_crtc_state->has_audio)
                intel_audio_codec_disable(encoder);
-               intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
-       }
 }
 
 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
@@ -219,10 +216,8 @@ static void intel_mst_enable_dp(struct intel_encoder *encoder,
        ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 
        ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
-       if (pipe_config->has_audio) {
-               intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
+       if (pipe_config->has_audio)
                intel_audio_codec_enable(encoder, pipe_config, conn_state);
-       }
 }
 
 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,