From cac5fcedaabdadf150c8a9be9fee76defc8ba444 Mon Sep 17 00:00:00 2001 From: Felix Monninger Date: Tue, 25 Oct 2016 22:28:08 +0100 Subject: [PATCH 1/7] drm: Release reference from blob lookup after replacing property MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit drm_property_lookup_blob() returns a reference to the returned blob, and drm_atomic_replace_property_blob() takes a references to the blob it stores, so afterwards we are left owning a reference to the new_blob that we never release, and thus leak memory every time we update a property such as during drm_atomic_helper_legacy_gamma_set(). v2: update credentials, drm_property_unreference_blob() is NULL safe and NULL is passed consistently to it throughout drm_atomic.c so do so here. Reported-by: Felix Monninger Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98420 Signed-off-by: Felix Monninger Signed-off-by: Chris Wilson Cc: stable@vger.kernel.org Fixes: 5488dc16fde7 ("drm: introduce pipe color correction properties") Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/20161025212808.3908-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/drm_atomic.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 23739609427d8..e6862a7442104 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -420,18 +420,21 @@ drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc, ssize_t expected_size, bool *replaced) { - struct drm_device *dev = crtc->dev; struct drm_property_blob *new_blob = NULL; if (blob_id != 0) { - new_blob = drm_property_lookup_blob(dev, blob_id); + new_blob = drm_property_lookup_blob(crtc->dev, blob_id); if (new_blob == NULL) return -EINVAL; - if (expected_size > 0 && expected_size != new_blob->length) + + if (expected_size > 0 && expected_size != new_blob->length) { + drm_property_unreference_blob(new_blob); return -EINVAL; + } } drm_atomic_replace_property_blob(blob, new_blob, replaced); + drm_property_unreference_blob(new_blob); return 0; } From 87d3b6588f9bf205902868d3e5baf68e37ad4ae1 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 20 Oct 2016 17:05:30 +0200 Subject: [PATCH 2/7] drm/fb-helper: Don't call dirty callback for untouched clips MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Since 4.7 kernel, we've seen the error messages like kernel: [TTM] Buffer eviction failed kernel: qxl 0000:00:02.0: object_init failed for (4026540032, 0x00000001) kernel: [drm:qxl_alloc_bo_reserved [qxl]] *ERROR* failed to allocate VRAM BO on QXL when switching and accessing on VT. The culprit was the generic deferred_io code (qxl driver switched to it since 4.7). There is a race between the dirty clip update and the call of callback. In drm_fb_helper_dirty(), the dirty clip is updated in the spinlock, while it kicks off the update worker outside the spinlock. Meanwhile the update worker clears the dirty clip in the spinlock, too. Thus, when drm_fb_helper_dirty() is called concurrently, schedule_work() is called after the clip is cleared in the first worker call. This patch addresses it by validating the clip before calling the dirty fb callback. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98322 Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1003298 Fixes: eaa434defaca ('drm/fb-helper: Add fb_deferred_io support') Cc: Signed-off-by: Takashi Iwai Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/20161020150530.5787-1-tiwai@suse.de --- drivers/gpu/drm/drm_fb_helper.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 03414bde1f152..aae7df01864d2 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -644,7 +644,9 @@ static void drm_fb_helper_dirty_work(struct work_struct *work) clip->x2 = clip->y2 = 0; spin_unlock_irqrestore(&helper->dirty_lock, flags); - helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); + /* call dirty callback only when it has been really touched */ + if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) + helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); } /** From 7dfcb36a1f17e4c7c7c12b9d8a6902037c7d98dc Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 26 Oct 2016 12:05:52 +0300 Subject: [PATCH 3/7] drm/fb-helper: Fix connector ref leak on error MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit We need to drop the connector references already taken when we abort in the middle of drm_fb_helper_single_add_all_connectors() Cc: stable@vger.kernel.org Cc: Carlos Santa Cc: Kirill A. Shutemov Tested-by: Carlos Santa Tested-by: Kirill A. Shutemov Signed-off-by: Ville Syrjälä Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1477472755-15288-2-git-send-email-ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_fb_helper.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index aae7df01864d2..efaccc2e1b4ca 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -131,7 +131,12 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) return 0; fail: for (i = 0; i < fb_helper->connector_count; i++) { - kfree(fb_helper->connector_info[i]); + struct drm_fb_helper_connector *fb_helper_connector = + fb_helper->connector_info[i]; + + drm_connector_unreference(fb_helper_connector->connector); + + kfree(fb_helper_connector); fb_helper->connector_info[i] = NULL; } fb_helper->connector_count = 0; From 38d868e41c4b9250d5a115c049dc2d48f4909581 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Mon, 10 Oct 2016 17:50:56 +0300 Subject: [PATCH 4/7] drm: Don't force all planes to be added to the state due to zpos MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit We don't want all planes to be added to the state whenever a plane with fixed zpos gets enabled/disabled. This is true especially for eg. cursor planes on i915, as we want cursor updates to go through w/o throttling. Same holds for drivers that don't support zpos at all (i915 actually falls into this category right now since we've not yet added zpos support). Allow drivers more freedom by letting them deal with zpos themselves instead of doing it in drm_atomic_helper_check_planes() unconditionally. Let's just inline the required calls into all the driver that currently depend on this. v2: Inline the stuff into the drivers instead of adding another helper, document things better (Daniel) Cc: Daniel Vetter Cc: Marek Szyprowski Cc: Benjamin Gaignard Cc: Vincent Abriou Cc: Laurent Pinchart Cc: Inki Dae Cc: Joonyoung Shim Cc: Seung-Woo Kim Cc: Kyungmin Park Cc: Lyude Cc: Maarten Lankhorst Cc: stable@vger.kernel.org Fixes: 44d1240d006c ("drm: add generic zpos property") Signed-off-by: Ville Syrjälä Reviewed-by: Sean Paul Acked-by: Benjamin Gaignard Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1476111056-12734-1-git-send-email-ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_atomic_helper.c | 4 ---- drivers/gpu/drm/exynos/exynos_drm_drv.c | 20 ++++++++++++++++++++ drivers/gpu/drm/exynos/exynos_drm_drv.h | 1 + drivers/gpu/drm/exynos/exynos_drm_fb.c | 2 +- drivers/gpu/drm/rcar-du/rcar_du_kms.c | 12 ++++++++++-- drivers/gpu/drm/sti/sti_drv.c | 22 +++++++++++++++++++++- include/drm/drm_plane.h | 8 +++++++- 7 files changed, 60 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index c3f83476f9960..21f9926055415 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -594,10 +594,6 @@ drm_atomic_helper_check_planes(struct drm_device *dev, struct drm_plane_state *plane_state; int i, ret = 0; - ret = drm_atomic_normalize_zpos(dev, state); - if (ret) - return ret; - for_each_plane_in_state(state, plane, plane_state, i) { const struct drm_plane_helper_funcs *funcs; diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index def78c8c1780a..f86e7c8466785 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -262,6 +262,26 @@ int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state, return 0; } +int exynos_atomic_check(struct drm_device *dev, + struct drm_atomic_state *state) +{ + int ret; + + ret = drm_atomic_helper_check_modeset(dev, state); + if (ret) + return ret; + + ret = drm_atomic_normalize_zpos(dev, state); + if (ret) + return ret; + + ret = drm_atomic_helper_check_planes(dev, state); + if (ret) + return ret; + + return ret; +} + static int exynos_drm_open(struct drm_device *dev, struct drm_file *file) { struct drm_exynos_file_private *file_priv; diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h index d215149e737b1..80c4d5b81689e 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h @@ -301,6 +301,7 @@ static inline int exynos_dpi_bind(struct drm_device *dev, int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state, bool nonblock); +int exynos_atomic_check(struct drm_device *dev, struct drm_atomic_state *state); extern struct platform_driver fimd_driver; diff --git a/drivers/gpu/drm/exynos/exynos_drm_fb.c b/drivers/gpu/drm/exynos/exynos_drm_fb.c index 40ce841eb9529..23cce0a3f5fcc 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fb.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fb.c @@ -190,7 +190,7 @@ dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index) static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { .fb_create = exynos_user_fb_create, .output_poll_changed = exynos_drm_output_poll_changed, - .atomic_check = drm_atomic_helper_check, + .atomic_check = exynos_atomic_check, .atomic_commit = exynos_atomic_commit, }; diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c index bd9c3bb9252c6..392c7e6de0427 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c @@ -231,8 +231,16 @@ static int rcar_du_atomic_check(struct drm_device *dev, struct rcar_du_device *rcdu = dev->dev_private; int ret; - ret = drm_atomic_helper_check(dev, state); - if (ret < 0) + ret = drm_atomic_helper_check_modeset(dev, state); + if (ret) + return ret; + + ret = drm_atomic_normalize_zpos(dev, state); + if (ret) + return ret; + + ret = drm_atomic_helper_check_planes(dev, state); + if (ret) return ret; if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c index 2784919a73664..9df308565f6ca 100644 --- a/drivers/gpu/drm/sti/sti_drv.c +++ b/drivers/gpu/drm/sti/sti_drv.c @@ -195,6 +195,26 @@ static void sti_atomic_work(struct work_struct *work) sti_atomic_complete(private, private->commit.state); } +static int sti_atomic_check(struct drm_device *dev, + struct drm_atomic_state *state) +{ + int ret; + + ret = drm_atomic_helper_check_modeset(dev, state); + if (ret) + return ret; + + ret = drm_atomic_normalize_zpos(dev, state); + if (ret) + return ret; + + ret = drm_atomic_helper_check_planes(dev, state); + if (ret) + return ret; + + return ret; +} + static int sti_atomic_commit(struct drm_device *drm, struct drm_atomic_state *state, bool nonblock) { @@ -248,7 +268,7 @@ static void sti_output_poll_changed(struct drm_device *ddev) static const struct drm_mode_config_funcs sti_mode_config_funcs = { .fb_create = drm_fb_cma_create, .output_poll_changed = sti_output_poll_changed, - .atomic_check = drm_atomic_helper_check, + .atomic_check = sti_atomic_check, .atomic_commit = sti_atomic_commit, }; diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h index 43cf193e54d66..8b4dc62470ffa 100644 --- a/include/drm/drm_plane.h +++ b/include/drm/drm_plane.h @@ -47,8 +47,14 @@ struct drm_crtc; * @src_h: height of visible portion of plane (in 16.16) * @rotation: rotation of the plane * @zpos: priority of the given plane on crtc (optional) + * Note that multiple active planes on the same crtc can have an identical + * zpos value. The rule to solving the conflict is to compare the plane + * object IDs; the plane with a higher ID must be stacked on top of a + * plane with a lower ID. * @normalized_zpos: normalized value of zpos: unique, range from 0 to N-1 - * where N is the number of active planes for given crtc + * where N is the number of active planes for given crtc. Note that + * the driver must call drm_atomic_normalize_zpos() to update this before + * it can be trusted. * @src: clipped source coordinates of the plane (in 16.16) * @dst: clipped destination coordinates of the plane * @visible: visibility of the plane From a2889606636d135148de101fe3311dfea67baf1c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 26 Oct 2016 17:41:18 +0300 Subject: [PATCH 5/7] drm/fb-helper: Keep references for the current set of used connectors MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The fbdev helper code keeps around two lists of connectors. One is the list of all connectors it could use, and that list already holds references for all the connectors. However the other list, or rather lists, is the one actively being used. That list is tracked per-crtc and currently doesn't hold any extra references. Let's grab those extra references to avoid oopsing when the connector vanishes. The list of all possible connectors should get updated when the hpd happens, but the list of actively used connectors would not get updated until the next time the fb-helper picks through the set of possible connectors. And so we need to hang on to the connectors until that time. Since we need to clean up in drm_fb_helper_crtc_free() as well, let's pull the code to a common place. And while at it let's pull in up the modeset->mode cleanup in there as well. The case of modeset->fb is a bit less clear. I'm thinking we should probably hold a reference to it, but for now I just slapped on a FIXME. v2: Cleanup things drm_fb_helper_crtc_free() too (Chris) v3: Don't leak modeset->connectors (Chris) Cc: Chris Wilson Cc: stable@vger.kernel.org Cc: Carlos Santa Cc: Kirill A. Shutemov Tested-by: Carlos Santa (v1) Tested-by: Kirill A. Shutemov (v1) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97666 Signed-off-by: Ville Syrjälä Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1477492878-4990-1-git-send-email-ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_fb_helper.c | 57 +++++++++++++++++++-------------- 1 file changed, 33 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index efaccc2e1b4ca..6c75e62c0b225 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -608,6 +608,24 @@ int drm_fb_helper_blank(int blank, struct fb_info *info) } EXPORT_SYMBOL(drm_fb_helper_blank); +static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper, + struct drm_mode_set *modeset) +{ + int i; + + for (i = 0; i < modeset->num_connectors; i++) { + drm_connector_unreference(modeset->connectors[i]); + modeset->connectors[i] = NULL; + } + modeset->num_connectors = 0; + + drm_mode_destroy(helper->dev, modeset->mode); + modeset->mode = NULL; + + /* FIXME should hold a ref? */ + modeset->fb = NULL; +} + static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) { int i; @@ -617,10 +635,12 @@ static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) kfree(helper->connector_info[i]); } kfree(helper->connector_info); + for (i = 0; i < helper->crtc_count; i++) { - kfree(helper->crtc_info[i].mode_set.connectors); - if (helper->crtc_info[i].mode_set.mode) - drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode); + struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set; + + drm_fb_helper_modeset_release(helper, modeset); + kfree(modeset->connectors); } kfree(helper->crtc_info); } @@ -2095,7 +2115,6 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) struct drm_fb_helper_crtc **crtcs; struct drm_display_mode **modes; struct drm_fb_offset *offsets; - struct drm_mode_set *modeset; bool *enabled; int width, height; int i; @@ -2143,45 +2162,35 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) /* need to set the modesets up here for use later */ /* fill out the connector<->crtc mappings into the modesets */ - for (i = 0; i < fb_helper->crtc_count; i++) { - modeset = &fb_helper->crtc_info[i].mode_set; - modeset->num_connectors = 0; - modeset->fb = NULL; - } + for (i = 0; i < fb_helper->crtc_count; i++) + drm_fb_helper_modeset_release(fb_helper, + &fb_helper->crtc_info[i].mode_set); for (i = 0; i < fb_helper->connector_count; i++) { struct drm_display_mode *mode = modes[i]; struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; struct drm_fb_offset *offset = &offsets[i]; - modeset = &fb_crtc->mode_set; + struct drm_mode_set *modeset = &fb_crtc->mode_set; if (mode && fb_crtc) { + struct drm_connector *connector = + fb_helper->connector_info[i]->connector; + DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n", mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y); + fb_crtc->desired_mode = mode; fb_crtc->x = offset->x; fb_crtc->y = offset->y; - if (modeset->mode) - drm_mode_destroy(dev, modeset->mode); modeset->mode = drm_mode_duplicate(dev, fb_crtc->desired_mode); - modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector; + drm_connector_reference(connector); + modeset->connectors[modeset->num_connectors++] = connector; modeset->fb = fb_helper->fb; modeset->x = offset->x; modeset->y = offset->y; } } - - /* Clear out any old modes if there are no more connected outputs. */ - for (i = 0; i < fb_helper->crtc_count; i++) { - modeset = &fb_helper->crtc_info[i].mode_set; - if (modeset->num_connectors == 0) { - BUG_ON(modeset->fb); - if (modeset->mode) - drm_mode_destroy(dev, modeset->mode); - modeset->mode = NULL; - } - } out: kfree(crtcs); kfree(modes); From 36e3fa6a38e135e9478a2f75dec9bf6ff1e6480e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 26 Oct 2016 16:30:33 +0300 Subject: [PATCH 6/7] drm/dp/mst: Clear port->pdt when tearing down the i2c adapter MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The i2c adapter is only relevant for some peer device types, so let's clear the pdt if it's still the same as the old_pdt when we tear down the i2c adapter. I don't really like this design pattern of updating port->whatever before doing the accompanying changes and passing around old_whatever to figure stuff out. Would make much more sense to me to the pass the new value around and only update the port->whatever when things are consistent. But let's try to work with what we have right now. Quoting a follow-up from Ville: "And naturally I forgot to amend the commit message w.r.t. this guy [the change in drm_dp_destroy_port]. We don't really need to do this here, but I figured I'd try to be a bit more consistent by having it, just to avoid accidental mistakes if/when someone changes this stuff again later." v2: Clear port->pdt in the caller, if needed (Daniel) Cc: Daniel Vetter Cc: stable@vger.kernel.org Cc: Carlos Santa Cc: Kirill A. Shutemov Tested-by: Carlos Santa (v1) Tested-by: Kirill A. Shutemov (v1) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97666 Signed-off-by: Ville Syrjälä Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1477488633-16544-1-git-send-email-ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_dp_mst_topology.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 04e457117980b..ba13f9d8720b9 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -914,6 +914,7 @@ static void drm_dp_destroy_port(struct kref *kref) /* no need to clean up vcpi * as if we have no connector we never setup a vcpi */ drm_dp_port_teardown_pdt(port, port->pdt); + port->pdt = DP_PEER_DEVICE_NONE; } kfree(port); } @@ -2919,6 +2920,7 @@ static void drm_dp_destroy_connector_work(struct work_struct *work) mgr->cbs->destroy_connector(mgr, port->connector); drm_dp_port_teardown_pdt(port, port->pdt); + port->pdt = DP_PEER_DEVICE_NONE; if (!port->input && port->vcpi.vcpi > 0) { drm_dp_mst_reset_vcpi_slots(mgr, port); From 4da5caa6a6f82cda3193bca855235b87debf78bd Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 26 Oct 2016 12:05:55 +0300 Subject: [PATCH 7/7] drm/dp/mst: Check peer device type before attempting EDID read MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Only certain types of pdts have the DDC bus registered, so check for that before we attempt the EDID read. Othwewise we risk playing around with an i2c adapter that doesn't actually exist. Cc: stable@vger.kernel.org Cc: Carlos Santa Cc: Kirill A. Shutemov Tested-by: Carlos Santa Tested-by: Kirill A. Shutemov Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97666 Signed-off-by: Ville Syrjälä Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1477472755-15288-5-git-send-email-ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_dp_mst_topology.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index ba13f9d8720b9..aa644487749c9 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1160,7 +1160,9 @@ static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, drm_dp_put_port(port); goto out; } - if (port->port_num >= DP_MST_LOGICAL_PORT_0) { + if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || + port->pdt == DP_PEER_DEVICE_SST_SINK) && + port->port_num >= DP_MST_LOGICAL_PORT_0) { port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); drm_mode_connector_set_tile_property(port->connector); }