[PATCH v2 05/12] drm: bridge: samsung-dsim: Add DSI init in bridge pre_enable()

[Jagan Teki <jagan@amarulasolutions.com>]

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.

v2:
* check initialized state in samsung_dsim_init

v1:
* keep DSI init in host transfer

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
 drivers/gpu/drm/bridge/samsung-dsim.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index 60dc863113a0..b9361af5ef2d 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -1259,6 +1259,9 @@ static int samsung_dsim_init(struct samsung_dsim *dsi)
 {
 	const struct samsung_dsim_driver_data *driver_data = dsi->driver_data;
 
+	if (dsi->state & DSIM_STATE_INITIALIZED)
+		return 0;
+
 	samsung_dsim_reset(dsi);
 	samsung_dsim_enable_irq(dsi);
 
@@ -1271,6 +1274,8 @@ static int samsung_dsim_init(struct samsung_dsim *dsi)
 	samsung_dsim_set_phy_ctrl(dsi);
 	samsung_dsim_init_link(dsi);
 
+	dsi->state |= DSIM_STATE_INITIALIZED;
+
 	return 0;
 }
 
@@ -1290,6 +1295,10 @@ static void samsung_dsim_atomic_pre_enable(struct drm_bridge *bridge,
 	}
 
 	dsi->state |= DSIM_STATE_ENABLED;
+
+	ret = samsung_dsim_init(dsi);
+	if (ret)
+		return;
 }
 
 static void samsung_dsim_atomic_enable(struct drm_bridge *bridge,
@@ -1464,12 +1473,9 @@ static ssize_t samsung_dsim_host_transfer(struct mipi_dsi_host *host,
 	if (!(dsi->state & DSIM_STATE_ENABLED))
 		return -EINVAL;
 
-	if (!(dsi->state & DSIM_STATE_INITIALIZED)) {
-		ret = samsung_dsim_init(dsi);
-		if (ret)
-			return ret;
-		dsi->state |= DSIM_STATE_INITIALIZED;
-	}
+	ret = samsung_dsim_init(dsi);
+	if (ret)
+		return ret;
 
 	ret = mipi_dsi_create_packet(&xfer.packet, msg);
 	if (ret < 0)
-- 
2.25.1