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| author | Dave Airlie <airlied@redhat.com> | 2022-09-28 06:50:28 +0300 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2022-09-28 06:50:46 +0300 |
| commit | 907cc346ff6a69a08b4786c4ed2a78ac0120b9da (patch) | |
| tree | 7d795e419f27d3f2709e2c8c1f61049a88e258ea /drivers/gpu/drm/display/drm_scdc_helper.c | |
| parent | 95d8c67187bcfaa519bafcdef9091cd906505454 (diff) | |
| parent | 39dd0cc2e5bd0d5188dd69f27e18783cea7ff06a (diff) | |
| download | linux-907cc346ff6a69a08b4786c4ed2a78ac0120b9da.tar.xz | |
Merge tag 'drm-misc-next-2022-09-23' of git://anongit.freedesktop.org/drm/drm-misc into drm-next
drm-misc-next for 6.1:
UAPI Changes:
Cross-subsystem Changes:
- dma-buf: Improve signaling when debugging
Core Changes:
- Backlight handling improvements
- format-helper: Add drm_fb_build_fourcc_list()
- fourcc: Kunit tests improvements
- modes: Add DRM_MODE_INIT() macro
- plane: Remove drm_plane_init(), Allocate planes with drm_universal_plane_alloc()
- plane-helper: Add drm_plane_helper_atomic_check()
- probe-helper: Add drm_connector_helper_get_modes_fixed() and
drm_crtc_helper_mode_valid_fixed()
- tests: Conversion to parametrized tests, test name consistency
Driver Changes:
- amdgpu: Fix for a VRAM eviction issue
- ast: Resolution handling improvements
- mediatek: small code improvements for DP
- omap: Refcounting fix, small improvements
- rockchip: RK3568 support, Gamma support for RK3399
- sun4i: Build failure fix when !OF
- udl: Multiple fixes here and there
- vc4: HDMI hotplug handling improvements
- vkms: Warning fix
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220923073943.d43tne5hni3iknlv@houat
Diffstat (limited to 'drivers/gpu/drm/display/drm_scdc_helper.c')
| -rw-r--r-- | drivers/gpu/drm/display/drm_scdc_helper.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/display/drm_scdc_helper.c b/drivers/gpu/drm/display/drm_scdc_helper.c index 81881e81ceae..c3ad4ab2b456 100644 --- a/drivers/gpu/drm/display/drm_scdc_helper.c +++ b/drivers/gpu/drm/display/drm_scdc_helper.c @@ -35,6 +35,19 @@ * HDMI 2.0 specification. It is a point-to-point protocol that allows the * HDMI source and HDMI sink to exchange data. The same I2C interface that * is used to access EDID serves as the transport mechanism for SCDC. + * + * Note: The SCDC status is going to be lost when the display is + * disconnected. This can happen physically when the user disconnects + * the cable, but also when a display is switched on (such as waking up + * a TV). + * + * This is further complicated by the fact that, upon a disconnection / + * reconnection, KMS won't change the mode on its own. This means that + * one can't just rely on setting the SCDC status on enable, but also + * has to track the connector status changes using interrupts and + * restore the SCDC status. The typical solution for this is to trigger an + * empty modeset in drm_connector_helper_funcs.detect_ctx(), like what vc4 does + * in vc4_hdmi_reset_link(). */ #define SCDC_I2C_SLAVE_ADDRESS 0x54 |