From ade66719aa7661f537914072f96e5182b35548d2 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Tue, 28 Sep 2021 12:52:01 +0100
Subject: [PATCH] tvservice: Add check to warn when running with kms

---
 host_applications/linux/apps/tvservice/CMakeLists.txt | 3 ++-
 host_applications/linux/apps/tvservice/tvservice.c    | 9 +++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/host_applications/linux/apps/tvservice/CMakeLists.txt b/host_applications/linux/apps/tvservice/CMakeLists.txt
index 6506842..0190774 100644
--- a/host_applications/linux/apps/tvservice/CMakeLists.txt
+++ b/host_applications/linux/apps/tvservice/CMakeLists.txt
@@ -1,5 +1,6 @@
+include_directories(${PROJECT_SOURCE_DIR}/host_applications/linux/libs/bcm_host/include)
 add_executable(tvservice tvservice.c)
-target_link_libraries(tvservice vchostif)
+target_link_libraries(tvservice vchostif bcm_host)
 
 install(TARGETS tvservice
         RUNTIME DESTINATION bin)
diff --git a/host_applications/linux/apps/tvservice/tvservice.c b/host_applications/linux/apps/tvservice/tvservice.c
index 451d56d..b5e7dc6 100644
--- a/host_applications/linux/apps/tvservice/tvservice.c
+++ b/host_applications/linux/apps/tvservice/tvservice.c
@@ -37,6 +37,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assert.h>
 #include <string.h>
 
+#include "bcm_host.h"
 #include "interface/vmcs_host/vc_tvservice.h"
 
 #define TV_SUPPORTED_MODE_T TV_SUPPORTED_MODE_NEW_T
@@ -806,6 +807,14 @@ int main( int argc, char **argv )
    int sdtvon_progressive = 0;
    TV_ATTACHED_DEVICES_T devices;
 
+   if (bcm_host_is_kms_active())
+   {
+      fprintf(stderr, "%s is not supported when using the vc4-kms-v3d driver.\n"
+                       "Similar features are available with standard linux tools\n"
+                       "such as modetest from libdrm-tests.\n", argv[0]);
+      exit(1);
+   }
+
    // Initialize VCOS
    vcos_init();