search for: drm_dp_mst_topology_mgr_set_mst

...@ static void s3_handle_mst(struct drm_device *dev, bool suspend) > if (suspend) { > drm_dp_mst_topology_mgr_suspend(mgr); > } else { > - ret = drm_dp_mst_topology_mgr_resume(mgr); > + ret = drm_dp_mst_topology_mgr_resume(mgr, true); > if (ret < 0) { > drm_dp_mst_topology_mgr_set_mst(mgr, false); > need_hotplug = true; > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index e407aba1fbd2..2fe24e366925 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -2020,6...

...u_dm/amdgpu_dm.c @@ -973,7 +973,7 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend) if (suspend) { drm_dp_mst_topology_mgr_suspend(mgr); } else { - ret = drm_dp_mst_topology_mgr_resume(mgr); + ret = drm_dp_mst_topology_mgr_resume(mgr, true); if (ret < 0) { drm_dp_mst_topology_mgr_set_mst(mgr, false); need_hotplug = true; diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index e407aba1fbd2..2fe24e366925 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2020,6 +2020,14 @@ drm_dp_mst_handle_...

...aux, + const u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + u8 mstm_cap; + + if (dpcd[DP_DPCD_REV] < DP_DPCD_REV_12) + return false; + + if (drm_dp_dpcd_readb(aux, DP_MSTM_CAP, &mstm_cap) != 1) + return false; + + return mstm_cap & DP_MST_CAP; +} +EXPORT_SYMBOL(drm_dp_read_mst_cap); + /** * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager * @mgr: manager to set state for diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 79c27f91f42c0..4c7314b7a84e4 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/i...

This is the large series for adding MST suspend/resume reprobing that I've been working on for quite a while now. In addition, I: - Refactored and cleaned up any code I ended up digging through in the process of understanding how some parts of these helpers worked. - Added some debugging tools along the way that I ended up needing to figure out some issues in my own code Note that

...ple times, so that's nice :) > > > > Similarly, is there any defense against calling get_mstb() between destroy() > > and > > the delayed destroy worker running? > > > Good question! There's only one instance where we unconditionally grab an MSTB > ref, drm_dp_mst_topology_mgr_set_mst(), and in that location we're guaranteed > to be the only one with access to that mstb until we drop &mgr->lock. > Everywhere else we use drm_dp_mst_topology_try_get_mstb(), which uses > kref_get_unless_zero() to protect against that kind of situation (and forces > the caller...

...gt; + INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work); > init_waitqueue_head(&mgr->tx_waitq); > mgr->dev = dev; > mgr->aux = aux; > @@ -4005,7 +4059,7 @@ void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) > { > drm_dp_mst_topology_mgr_set_mst(mgr, false); > flush_work(&mgr->work); > - flush_work(&mgr->destroy_connector_work); > + cancel_work_sync(&mgr->delayed_destroy_work); > mutex_lock(&mgr->payload_lock); > kfree(mgr->payloads); > mgr->payloads = NULL; > diff --git a/incl...

This fixes some annoying issues on the P50-P52 with displays not being detected if they aren't plugged in at boot, and sometimes even when they are plugged in at boot. See: https://bugzilla.redhat.com/show_bug.cgi?id=1477182 Lyude Paul (2): drm/nouveau: Only write DP_MSTM_CTRL when needed drm/nouveau: Reset MST branching unit before enabling drivers/gpu/drm/nouveau/dispnv50/disp.c | 65

...gt; the > destroy function multiple times, so that's nice :) > > Similarly, is there any defense against calling get_mstb() between destroy() > and > the delayed destroy worker running? > Good question! There's only one instance where we unconditionally grab an MSTB ref, drm_dp_mst_topology_mgr_set_mst(), and in that location we're guaranteed to be the only one with access to that mstb until we drop &mgr->lock. Everywhere else we use drm_dp_mst_topology_try_get_mstb(), which uses kref_get_unless_zero() to protect against that kind of situation (and forces the caller to check with __mus...

Most of the reason I'm asking for an RFC here is because this code pulls a lot of code out of i915 and into shared DP helpers. Anyway-nouveau's HPD related code has been collecting dust for a while. Other then the occasional runtime PM related and MST related fixes, we're missing a lot of nice things that have been added to DRM since this was originally written. Additionally, the code

...atic void nv50_mstm_init(struct nv50_mstm *mstm) { - if (mstm && mstm->mgr.mst_state) - drm_dp_mst_topology_mgr_resume(&mstm->mgr); + int ret; + + if (!mstm || !mstm->mgr.mst_state) + return; + + ret = drm_dp_mst_topology_mgr_resume(&mstm->mgr); + if (ret == -1) { + drm_dp_mst_topology_mgr_set_mst(&mstm->mgr, false); + drm_kms_helper_hotplug_event(mstm->mgr.dev); + } } static void -- 2.19.1

Most of the reason I'm asking for an RFC here is because this code pulls a lot of code out of i915 and into shared DP helpers. Anyway-nouveau's HPD related code has been collecting dust for a while. Other then the occasional runtime PM related and MST related fixes, we're missing a lot of nice things that have been added to DRM since this was originally written. Additionally, the code

..., drm_dp_destroy_connector_work); + INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work); init_waitqueue_head(&mgr->tx_waitq); mgr->dev = dev; mgr->aux = aux; @@ -4005,7 +4059,7 @@ void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) { drm_dp_mst_topology_mgr_set_mst(mgr, false); flush_work(&mgr->work); - flush_work(&mgr->destroy_connector_work); + cancel_work_sync(&mgr->delayed_destroy_work); mutex_lock(&mgr->payload_lock); kfree(mgr->payloads); mgr->payloads = NULL; diff --git a/include/drm/drm_dp_mst_helper.h b/inclu...

To start off: this patch series is less work to review then it looks - most (but not all) of the nouveau related work has already been reviewed elsewhere. Most of the reason I'm asking for an RFC here is because this code pulls a lot of code out of i915 and into shared DP helpers. Anyway-nouveau's HPD related code has been collecting dust for a while. Other then the occasional runtime PM

..., drm_dp_destroy_connector_work); + INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work); init_waitqueue_head(&mgr->tx_waitq); mgr->dev = dev; mgr->aux = aux; @@ -4255,7 +4309,7 @@ void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) { drm_dp_mst_topology_mgr_set_mst(mgr, false); flush_work(&mgr->work); - flush_work(&mgr->destroy_connector_work); + cancel_work_sync(&mgr->delayed_destroy_work); mutex_lock(&mgr->payload_lock); kfree(mgr->payloads); mgr->payloads = NULL; @@ -4267,7 +4321,7 @@ void drm_dp_mst_topology_mgr_d...

To start off: this patch series is less work to review then it looks - most (but not all) of the nouveau related work has already been reviewed elsewhere. Most of the reason I'm asking for an RFC here is because this code pulls a lot of code out of i915 and into shared DP helpers. Anyway-nouveau's HPD related code has been collecting dust for a while. Other then the occasional runtime PM

...r, port->parent); if (!mstb) return -EINVAL; @@ -2048,7 +2058,7 @@ static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, } kfree(txmsg); fail_put: - drm_dp_put_mst_branch_device(mstb); + drm_dp_mst_topology_put_mstb(mstb); return ret; } @@ -2192,7 +2202,7 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms out_unlock: mutex_unlock(&mgr->lock); if (mstb) - drm_dp_put_mst_branch_device(mstb); + drm_dp_mst_topology_put_mstb(mstb); return ret; } @@ -2357,7 +2367,7 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)...

This is the final portion of the large series for adding MST suspend/resume reprobing that I've been working on for quite a while now. In addition, I: * Refactored and cleaned up any code I ended up digging through in the process of understanding how some parts of these helpers worked. * Added some debugging tools along the way that I ended up needing to figure out some issues in my own

...| Schedules → ------------------------------ | Thread 3 Drop last RPM ref -v | output_poll_execute() pm_runtime_put_sync() | | drm_dp_mst_topology_mgr_set_mst() Finish | | ← Schedules | -----------------------------| | | Thread...

This is the large series for adding MST suspend/resume reprobing that I've been working on for quite a while now. In addition, I: - Refactored and cleaned up any code I ended up digging through in the process of understanding how some parts of these helpers worked. - Added some debugging tools along the way that I ended up needing to figure out some issues in my own code Note that

On Wed, Jul 18, 2018 at 04:56:39PM -0400, Lyude Paul wrote: > When DP MST hubs get confused, they can occasionally stop responding for > a good bit of time up until the point where the DRM driver manages to > do the right DPCD accesses to get it to start responding again. In a > worst case scenario however, this process can take upwards of 10+ > seconds. > > Currently we use