[PATCH v9 09/18] drm: bridge: samsung-dsim: Add host init in pre_enable

[Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>]

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.

v9:
* added the patch again

v3:
* none

v2:
* check initialized state in samsung_dsim_init

v1:
* keep DSI init in host transfer

Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/bridge/samsung-dsim.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index 9adab5d372cc..2e15d753fdd0 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -1250,10 +1250,13 @@ static void samsung_dsim_disable_irq(struct samsung_dsim *dsi)
 	disable_irq(dsi->irq);
 }
 
-static int samsung_dsim_init(struct samsung_dsim *dsi)
+static int samsung_dsim_init(struct samsung_dsim *dsi, unsigned int flag)
 {
 	const struct samsung_dsim_driver_data *driver_data = dsi->driver_data;
 
+	if (dsi->state & flag)
+		return 0;
+
 	samsung_dsim_reset(dsi);
 	samsung_dsim_enable_irq(dsi);
 
@@ -1266,6 +1269,8 @@ static int samsung_dsim_init(struct samsung_dsim *dsi)
 	samsung_dsim_set_phy_ctrl(dsi);
 	samsung_dsim_init_link(dsi);
 
+	dsi->state |= flag;
+
 	return 0;
 }
 
@@ -1285,6 +1290,10 @@ static void samsung_dsim_atomic_pre_enable(struct drm_bridge *bridge,
 	}
 
 	dsi->state |= DSIM_STATE_ENABLED;
+
+	ret = samsung_dsim_init(dsi, DSIM_STATE_INITIALIZED);
+	if (ret)
+		return;
 }
 
 static void samsung_dsim_atomic_enable(struct drm_bridge *bridge,
@@ -1458,12 +1467,9 @@ 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, DSIM_STATE_INITIALIZED);
+	if (ret)
+		return ret;
 
 	ret = mipi_dsi_create_packet(&xfer.packet, msg);
 	if (ret < 0)
-- 
2.25.1