diff options
| author | Dave Stevenson <dave.stevenson@raspberrypi.com> | 2022-12-05 20:33:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-19 17:21:23 +0300 |
| commit | 5044e5f2511c9afdf9880d2bb6b9d37dfc345dac (patch) | |
| tree | eb0bb53d21a0e5cd80036d875892de2136a81be6 /include | |
| parent | 1d9473b88e010d4ed25c7086b0ae8b00321557b3 (diff) | |
| download | linux-5044e5f2511c9afdf9880d2bb6b9d37dfc345dac.tar.xz | |
drm/bridge: Introduce pre_enable_prev_first to alter bridge init order
[ Upstream commit 4fb912e5e19075874379cfcf074d90bd51ebf8ea ]
DSI sink devices typically want the DSI host powered up and configured
before they are powered up. pre_enable is the place this would normally
happen, but they are called in reverse order from panel/connector towards
the encoder, which is the "wrong" order.
Add a new flag pre_enable_prev_first that any bridge can set
to swap the order of pre_enable (and post_disable) for that and the
immediately previous bridge.
Should the immediately previous bridge also set the
pre_enable_prev_first flag, the previous bridge to that will be called
before either of those which requested pre_enable_prev_first.
eg:
- Panel
- Bridge 1
- Bridge 2 pre_enable_prev_first
- Bridge 3
- Bridge 4 pre_enable_prev_first
- Bridge 5 pre_enable_prev_first
- Bridge 6
- Encoder
Would result in pre_enable's being called as Panel, Bridge 1, Bridge 3,
Bridge 2, Bridge 6, Bridge 5, Bridge 4, Encoder.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Link: https://lore.kernel.org/r/20221205173328.1395350-5-dave.stevenson@raspberrypi.com
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Stable-dep-of: dd9e329af723 ("drm/bridge: ti-sn65dsi83: Fix enable/disable flow to meet spec")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/drm/drm_bridge.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 288c6feda5de..6b656ea23b96 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -769,6 +769,14 @@ struct drm_bridge { */ bool interlace_allowed; /** + * @pre_enable_prev_first: The bridge requires that the prev + * bridge @pre_enable function is called before its @pre_enable, + * and conversely for post_disable. This is most frequently a + * requirement for DSI devices which need the host to be initialised + * before the peripheral. + */ + bool pre_enable_prev_first; + /** * @ddc: Associated I2C adapter for DDC access, if any. */ struct i2c_adapter *ddc; |