[PATCH v3 4/7] drm: exynos: dsi: Separate pre_enable, post_disable code

[Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>]

Existing driver is calling manual bridge pre_enable, enable,
disable and post_disable helpers with their enable and
disable functions.

Separate the enable code with pre_enable and enable helpers
like enable the DSI in pre_enable and set the display in enable.

Separate the disable code with disable and post_disable helpers
like disable the DSI in disable and reset the display in
post_disable.

This way the bridge functions are compatible with respective
downstream bridge and panel_bridge drivers.

Example of enable bridge function calls with panel_bridge is,

[ 2.079030] panel_bridge_pre_enable: start
[ 2.079043] panel_bridge_pre_enable: end!
[ 2.079045] exynos_dsi_atomic_pre_enable: start
[ 2.079723] exynos_dsi_atomic_pre_enable: end!
[ 2.079728] exynos_dsi_atomic_enable: start
[ 2.102500] exynos_dsi_atomic_enable: end
[ 2.146505] panel_bridge_enable: start
[ 2.148547] panel_bridge_enable: enable

Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
---
Changes for v3:
- new patch

 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 1450187c1edc..07083a545948 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1377,10 +1377,9 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
 	}
 }
 
-static void exynos_dsi_enable(struct drm_bridge *bridge)
+static void exynos_dsi_pre_enable(struct drm_bridge *bridge)
 {
 	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
-	const struct drm_bridge_funcs *funcs = dsi->out_bridge->funcs;
 	int ret;
 
 	if (dsi->state & DSIM_STATE_ENABLED)
@@ -1393,38 +1392,36 @@ static void exynos_dsi_enable(struct drm_bridge *bridge)
 	}
 
 	dsi->state |= DSIM_STATE_ENABLED;
+}
 
-	if (dsi->out_bridge)
-		funcs->pre_enable(dsi->out_bridge);
+static void exynos_dsi_enable(struct drm_bridge *bridge)
+{
+	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
 
 	exynos_dsi_set_display_mode(bridge);
 	exynos_dsi_set_display_enable(dsi, true);
 
-	if (dsi->out_bridge)
-		funcs->enable(dsi->out_bridge);
-
 	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
+
 	return;
 }
 
 static void exynos_dsi_disable(struct drm_bridge *bridge)
 {
 	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
-	const struct drm_bridge_funcs *funcs = dsi->out_bridge->funcs;
 
 	if (!(dsi->state & DSIM_STATE_ENABLED))
 		return;
 
 	dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
+}
 
-	if (dsi->out_bridge)
-		funcs->disable(dsi->out_bridge);
+static void exynos_dsi_post_disable(struct drm_bridge *bridge)
+{
+	struct exynos_dsi *dsi = bridge_to_dsi(bridge);
 
 	exynos_dsi_set_display_enable(dsi, false);
 
-	if (dsi->out_bridge)
-		funcs->post_disable(dsi->out_bridge);
-
 	dsi->state &= ~DSIM_STATE_ENABLED;
 	pm_runtime_put_sync(dsi->dev);
 }
@@ -1438,8 +1435,10 @@ static int exynos_dsi_attach(struct drm_bridge *bridge,
 }
 
 static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
+	.pre_enable			= exynos_dsi_pre_enable,
 	.enable				= exynos_dsi_enable,
 	.disable			= exynos_dsi_disable,
+	.post_disable			= exynos_dsi_post_disable,
 	.attach				= exynos_dsi_attach,
 };
 
-- 
2.25.1