gdc: add a probed flag to avoid crash [1/1]

PD#SWPL-29848

Problem:
on platforms which GDC are not supported
if create_gdc_work_queue is invoked
a crash occurs

Solution:
add a probed flag to avoid crash
add a interface is_gdc_supported to query

Verify:
g12b/tm2

Change-Id: I65b88294822d8a2c7429d375039fee962b9612aa
Signed-off-by: Cao Jian <jian.cao@amlogic.com>

drivers/amlogic/media/gdc/app/gdc_module.c

@@ -1900,6 +1900,8 @@ static int gdc_platform_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, gdc_dev);
 	gdc_pwr_config(false);
 
+	gdc_manager.probed = 1;
+
 	return rc;
 }
 

drivers/amlogic/media/gdc/app/gdc_wq.c

@@ -324,6 +324,15 @@ static inline int work_queue_no_space(struct gdc_context_s *queue)
 	return  list_empty(&queue->free_queue);
 }
 
+bool is_gdc_supported(void)
+{
+	if (gdc_manager.probed)
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL(is_gdc_supported);
+
 struct gdc_context_s *create_gdc_work_queue(void)
 {
 	int  i;
@@ -331,6 +340,10 @@ struct gdc_context_s *create_gdc_work_queue(void)
 	struct gdc_context_s *gdc_work_queue;
 	int  empty;
 
+	if (!gdc_manager.probed) {
+		gdc_log(LOG_INFO, "GDC is not supported for this chip\n");
+		return NULL;
+	}
 	gdc_work_queue = kzalloc(sizeof(struct gdc_context_s), GFP_KERNEL);
 	if (IS_ERR(gdc_work_queue)) {
 		gdc_log(LOG_ERR, "can't create work queue\n");

drivers/amlogic/media/gdc/inc/gdc/gdc_config.h

@@ -56,6 +56,7 @@ struct gdc_manager_s {
 	int gdc_state;
 	int process_queue_state;//thread running flag
 	struct meson_gdc_dev_t *gdc_dev;
+	int probed;
 };
 
 extern struct gdc_manager_s gdc_manager;

include/linux/amlogic/media/gdc/gdc.h

@@ -165,9 +165,10 @@ struct gdc_phy_setting {
 	char config_name[CONFIG_PATH_LENG];
 };
 
+bool is_gdc_supported(void);
+struct gdc_context_s *create_gdc_work_queue(void);
 int gdc_process_phys(struct gdc_context_s *context,
 		     struct gdc_phy_setting *gs);
-struct gdc_context_s *create_gdc_work_queue(void);
 int destroy_gdc_work_queue(struct gdc_context_s *gdc_work_queue);
 
 #endif