Merge tag 'drm-misc-next-2020-06-19' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

drm-misc-next for v5.9:

UAPI Changes:
- Add DRM_MODE_TYPE_USERDEF for video modes specified in cmdline.

Cross-subsystem Changes:
- Assorted devicetree binding updates.
- Add might_sleep() to dma_fence_wait().
- Fix fbdev's get_user_pages_fast() handling, and use pin_user_pages.
- Small cleanup with IS_BUILTIN in video/fbdev drivers.
- Fix video/hdmi coding style for infoframe size.

Core Changes:
- Silence vblank output during init.
- Fix DP-MST corruption during send msg timeout.
- Clear leak in drm_gem_objecs_lookup().
- Make newlines work with force connector attribute.
- Fix module refcounting error in drm_encoder_slave, and use new i2c api.
- Header fix for drm_managed.c
- More struct_mutex removal for !legacy drivers:
  - Remove gem_free_object()
  - Removal of drm_gem_object_put_unlocked().
- Show current->comm alongside pid in debug printfs.
- Add drm_client_modeset_check() + drm_client_framebuffer_flush().
- Replace drm_fb_swab16 with drm_fb_swap that also supports 32-bits.
- Remove mode->vrefresh, and compactify drm_display_mode.
- Use drm_* macros for logging and warnings.
- Add WARN when drm_gem_get_pages is used on a private obj.
- Handle importing and imported dmabuf better in shmem helpers.
- Small fix for drm/mm hole size comparison, and remove invalid entry optimization.
- Add a drm/mm selftest.
- Set DSI connector type for DSI panels.
- Assorted small fixes and documentation updates.
- Fix DDI I2C device registration for MST ports, and flushing on destroy.
- Fix master_set return type, used by vmwgfx.
- Make the drm_set/drop_master ioctl symmetrical.

Driver Changes:
 Allow iommu in the sun4i driver and use it for sun8i.
- Simplify backlight lookup for omap, amba-clcd and tilcdc.
- Hold reg_lock for rockchip.
- Add support for bridge gpio and lane reordering + polarity to ti-sn65dsi86, and fix clock choice.
- Small assorted fixes to tilcdc, vc4, i915, omap, fbdev/sm712fb, fbdev/pxafb, console/newport_con, msm, virtio, udl, malidp, hdlcd, bridge/ti-sn65dsi86, panfrost.
- Remove hw cursor support for mgag200, and use simple kms helper + shmem helpers.
- Add support for KOE  Allow iommu in the sun4i driver and use it for sun8i.
- Simplify backlight lookup for omap, amba-clcd and tilcdc.
- Hold reg_lock for rockchip.
- Add support for bridge gpio and lane reordering + polarity to ti-sn65dsi86, and fix clock choice.
- Small assorted fixes to tilcdc, vc4 (multiple), i915.
- Remove hw cursor support for mgag200, and use simple kms helper + shmem helpers.
- Add support for KOE TX26D202VM0BWA panel.
- Use GEM CMA functions in arc, arm, atmel-hlcdc, fsi-dcu, hisilicon, imx, ingenic, komeda, malidp, mcde, meson, msxfb, rcar-du, shmobile, stm, sti, tilcdc, tve200, zte.
- Remove gem_print_info.
- Improve gem_create_object_helper so udl can use shmem helpers.
- Convert vc4 dt bindings to schemas, and add clock properties.
- Device initialization cleanups for mgag200.
- Add a workaround to fix DP-MST short pulses handling on broken hardware in i915.
- Allow build test compiling arm drivers.
- Use managed pci functions in mgag200 and ast.
- Use dev_groups in malidp.
- Add per pixel alpha support for PX30 VOP in rockchip.
- Silence deferred probe logs in panfrost.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/001cd9a6-405d-4e29-43d8-354f53ae4e8b@linux.intel.com

1 files changed, 27 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index d877ddc6dc57..b7bd46033807 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -953,8 +953,7 @@ static const struct drm_prop_enum_list dp_colorspaces[] = {
  * 	connector is linked to. Drivers should never set this property directly,
  * 	it is handled by the DRM core by calling the &drm_connector_funcs.dpms
  * 	callback. For atomic drivers the remapping to the "ACTIVE" property is
- * 	implemented in the DRM core.  This is the only standard connector
- * 	property that userspace can change.
+ * 	implemented in the DRM core.
  *
  * 	Note that this property cannot be set through the MODE_ATOMIC ioctl,
  * 	userspace must use "ACTIVE" on the CRTC instead.
@@ -1000,6 +999,32 @@ static const struct drm_prop_enum_list dp_colorspaces[] = {
  *      after modeset, the kernel driver may set this to "BAD" and issue a
  *      hotplug uevent. Drivers should update this value using
  *      drm_connector_set_link_status_property().
+ *
+ *      When user-space receives the hotplug uevent and detects a "BAD"
+ *      link-status, the sink doesn't receive pixels anymore (e.g. the screen
+ *      becomes completely black). The list of available modes may have
+ *      changed. User-space is expected to pick a new mode if the current one
+ *      has disappeared and perform a new modeset with link-status set to
+ *      "GOOD" to re-enable the connector.
+ *
+ *      If multiple connectors share the same CRTC and one of them gets a "BAD"
+ *      link-status, the other are unaffected (ie. the sinks still continue to
+ *      receive pixels).
+ *
+ *      When user-space performs an atomic commit on a connector with a "BAD"
+ *      link-status without resetting the property to "GOOD", the sink may
+ *      still not receive pixels. When user-space performs an atomic commit
+ *      which resets the link-status property to "GOOD" without the
+ *      ALLOW_MODESET flag set, it might fail because a modeset is required.
+ *
+ *      User-space can only change link-status to "GOOD", changing it to "BAD"
+ *      is a no-op.
+ *
+ *      For backwards compatibility with non-atomic userspace the kernel
+ *      tries to automatically set the link-status back to "GOOD" in the
+ *      SETCRTC IOCTL. This might fail if the mode is no longer valid, similar
+ *      to how it might fail if a different screen has been connected in the
+ *      interim.
  * non_desktop:
  * 	Indicates the output should be ignored for purposes of displaying a
  * 	standard desktop environment or console. This is most likely because