[PATCH 04/11] drm: bridge: samsung-dsim: Add DSI init in bridge pre_enable()

Jagan Teki
2022-04-08T16:24:30Z

Host transfer() in DSI master will invoke only when the DSI commands
are sent from DSI devices like DSI Panel or DSI bridges and this
host transfer wouldn't invoke for I2C-based-DSI bridge drivers.

Handling DSI host initialization in transfer calls misses the
controller setup for I2C configured DSI bridges.

This patch adds the DSI initialization from transfer to bridge
pre_enable as the bridge pre_enable API is invoked by core as
it is common across all classes of DSI device drivers.

v1:
* keep DSI init in host transfer

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
drivers/gpu/drm/bridge/samsung-dsim.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index ff05c8e01cff..3e12b469dfa8 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -1290,6 +1290,13 @@ static void samsung_dsim_atomic_pre_enable(struct drm_bridge *bridge,
}

dsi->state |= DSIM_STATE_ENABLED;
+
+ if (!(dsi->state & DSIM_STATE_INITIALIZED)) {
+ ret = samsung_dsim_init(dsi);
+ if (ret)
+ return;
+ dsi->state |= DSIM_STATE_INITIALIZED;
+ }
}

static void samsung_dsim_atomic_enable(struct drm_bridge *bridge,
--
2.25.1