[PATCH v2 3/5] drm/msm/dsi: Create a helper to check if there is a connected device

[Archit Taneja <architt@codeaurora.org>]

Create a helper msm_dsi_device_connected() which checks whether we have a
device connected to the dsi host or not. This check gets messy when we
have support external bridges too. Having an inline function makes it
more legible.

For now, the check only consists of msm_dsi->panel being non-NULL. Later,
this will check if we have an external bridge or not.

This helper isn't used in dsi_connector related code as that's specific
to only when a drm_panel is connected.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/gpu/drm/msm/dsi/dsi.c         | 2 +-
 drivers/gpu/drm/msm/dsi/dsi.h         | 5 +++++
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 6 ++++--
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index 9f5fe59..e991270 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -15,7 +15,7 @@
 
 struct drm_encoder *msm_dsi_get_encoder(struct msm_dsi *msm_dsi)
 {
-	if (!msm_dsi || !msm_dsi->panel)
+	if (!msm_dsi || !msm_dsi_device_connected(msm_dsi))
 		return NULL;
 
 	return (msm_dsi->device_flags & MIPI_DSI_MODE_VIDEO) ?
diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index fe5204e..918b0c6 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -96,6 +96,11 @@ int msm_dsi_manager_register(struct msm_dsi *msm_dsi);
 void msm_dsi_manager_unregister(struct msm_dsi *msm_dsi);
 
 /* msm dsi */
+static inline bool msm_dsi_device_connected(struct msm_dsi *msm_dsi)
+{
+	return msm_dsi->panel;
+}
+
 struct drm_encoder *msm_dsi_get_encoder(struct msm_dsi *msm_dsi);
 
 /* dsi pll */
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 925412e..e252d9d 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -332,7 +332,8 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
 	int ret;
 
 	DBG("id=%d", id);
-	if (!panel || (is_dual_panel && (DSI_1 == id)))
+	if (!msm_dsi_device_connected(msm_dsi) ||
+			(is_dual_panel && (DSI_1 == id)))
 		return;
 
 	ret = msm_dsi_host_power_on(host);
@@ -419,7 +420,8 @@ static void dsi_mgr_bridge_post_disable(struct drm_bridge *bridge)
 
 	DBG("id=%d", id);
 
-	if (!panel || (is_dual_panel && (DSI_1 == id)))
+	if (!msm_dsi_device_connected(msm_dsi) ||
+			(is_dual_panel && (DSI_1 == id)))
 		return;
 
 	ret = drm_panel_disable(panel);
-- 
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