drm/client: Send hotplug event after registering a client

commit 27655b9b upstream.

Generate a hotplug event after registering a client to allow the
client to configure its display. Remove the hotplug calls from the
existing clients for fbdev emulation. This change fixes a concurrency
bug between registering a client and receiving events from the DRM
core. The bug is present in the fbdev emulation of all drivers.

The fbdev emulation currently generates a hotplug event before
registering the client to the device. For each new output, the DRM
core sends an additional hotplug event to each registered client.

If the DRM core detects first output between sending the artificial
hotplug and registering the device, the output's hotplug event gets
lost. If this is the first output, the fbdev console display remains
dark. This has been observed with amdgpu and fbdev-generic.

Fix this by adding hotplug generation directly to the client's
register helper drm_client_register(). Registering the client and
receiving events are serialized by struct drm_device.clientlist_mutex.
So an output is either configured by the initial hotplug event, or
the client has already been registered.

The bug was originally added in commit 6e3f17ee ("drm/fb-helper:
generic: Call drm_client_add() after setup is done"), in which adding
a client and receiving a hotplug event switched order. It was hidden,
as most hardware and drivers have at least on static output configured.
Other drivers didn't use the internal DRM client or still had struct
drm_mode_config_funcs.output_poll_changed set. That callback handled
hotplug events as well. After not setting the callback in amdgpu in
commit 0e3172ba ("drm/amdgpu: Don't set struct
drm_driver.output_poll_changed"), amdgpu did not show a framebuffer
console if output events got lost. The bug got copy-pasted from
fbdev-generic into the other fbdev emulation.

Reported-by: Moritz Duge <MoritzDuge@kolahilft.de>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/2649


Fixes: 6e3f17ee ("drm/fb-helper: generic: Call drm_client_add() after setup is done")
Fixes: 8ab59da2 ("drm/fb-helper: Move generic fbdev emulation into separate source file")
Fixes: b79fe9ab ("drm/fbdev-dma: Implement fbdev emulation for GEM DMA helpers")
Fixes: 63c38155 ("drm/armada: Implement fbdev emulation as in-kernel client")
Fixes: 49953b70 ("drm/exynos: Implement fbdev emulation as in-kernel client")
Fixes: 8f1aaccb ("drm/gma500: Implement client-based fbdev emulation")
Fixes: 940b869c ("drm/msm: Implement fbdev emulation as in-kernel client")
Fixes: 9e69bcd8 ("drm/omapdrm: Implement fbdev emulation as in-kernel client")
Fixes: e317a69f ("drm/radeon: Implement client-based fbdev emulation")
Fixes: 71ec16f4 ("drm/tegra: Implement fbdev emulation as in-kernel client")
Fixes: 0e3172ba ("drm/amdgpu: Don't set struct drm_driver.output_poll_changed")
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Moritz Duge <MoritzDuge@kolahilft.de>
Tested-by: Torsten Krah <krah.tm@gmail.com>
Tested-by: Paul Schyska <pschyska@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@gmail.com>
Cc: Noralf Trønnes <noralf@tronnes.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Javier Martinez Canillas <javierm@redhat.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Mikko Perttunen <mperttunen@nvidia.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Cc: linux-tegra@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v5.2+
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> # msm
Link: https://patchwork.freedesktop.org/patch/msgid/20230710091029.27503-1-tzimmermann@suse.de
(cherry picked from commit 27655b9b)
[ Dropped changes to drivers/gpu/drm/armada/armada_fbdev.c as
  174c3c38 drm/armada: Initialize fbdev DRM client
  was introduced in 6.5-rc1.

  Dropped changes to exynos, msm, omapdrm, radeon, tegra drivers
  as missing code these commits introduced:

  99286486 drm/exynos: Initialize fbdev DRM client
  841ef552 drm/msm: Initialize fbdev DRM client
  9e69bcd8 drm/omapdrm: Implement fbdev emulation as in-kernel client
  e317a69f drm/radeon: Implement client-based fbdev emulation
  9b926bcf drm/radeon: Only build fbdev if DRM_FBDEV_EMULATION is set
  25dda38e drm/tegra: Initialize fbdev DRM client
  8f1aaccb drm/gma500: Implement client-based fbdev emulation
  b79fe9ab drm/fbdev-dma: Implement fbdev emulation for GEM DMA helpers

  Move code for drm-fbdev-generic.c to matching file in 6.1.y because
  these commits haven't happened in 6.1.y.
  8ab59da2 drm/fb-helper: Move generic fbdev emulation into separate source file
  b9c93f4e drm/fbdev-generic: Rename symbols ]
Cc: alexandru.gagniuc@hp.com
Link: https://lore.kernel.org/stable/SJ0PR84MB20882EEA1ABB36F60E845E378F5AA@SJ0PR84MB2088.NAMPRD84.PROD.OUTLOOK.COM/


Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>