In preparation to tightening driver control over generated InfoFrames,
make sure to warn the user if the driver rejects the InfoFrames on the
grounds of it being unsupported.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index a561f124be99a0cd4259dbacf5f5f6651ff8a0ea..361912de2741939cfb5ec350c08d738a92e2ad37 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -920,6 +920,8 @@ static int clear_infoframe(struct drm_connector *connector,
 	int ret;
 
 	ret = clear_device_infoframe(connector, old_frame->data.any.type);
+	if (ret == -EOPNOTSUPP)
+		dev_warn_once(it->dev, "unsupported HDMI infoframe 0x%x\n", frame->any.type);
 	if (ret)
 		return ret;
 
@@ -947,6 +949,8 @@ static int write_device_infoframe(struct drm_connector *connector,
 		return len;
 
 	ret = funcs->write_infoframe(connector, frame->any.type, buffer, len);
+	if (ret == -EOPNOTSUPP)
+		dev_warn_once(it->dev, "unsupported HDMI infoframe 0x%x\n", frame->any.type);
 	if (ret) {
 		drm_dbg_kms(dev, "Call failed: %d\n", ret);
 		return ret;

-- 
2.47.3

Hi Dmitry,

kernel test robot noticed the following build errors:

[auto build test ERROR on bf2602a3cb2381fb1a04bf1c39a290518d2538d1]

url:    https://github.com/intel-lab-lkp/linux/commits/Dmitry-Baryshkov/drm-display-hdmi-state-helpers-warn-on-unsupported-InfoFrame-types/20250927-090630
base:   bf2602a3cb2381fb1a04bf1c39a290518d2538d1
patch link:    https://lore.kernel.org/r/20250927-limit-infoframes-2-v1-1-697511bd050b%40oss.qualcomm.com
patch subject: [PATCH 1/9] drm/display: hdmi-state-helpers: warn on unsupported InfoFrame types
config: x86_64-buildonly-randconfig-002-20250927 (https://download.01.org/0day-ci/archive/20250927/202509272013.GAc17rsa-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250927/202509272013.GAc17rsa-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509272013.GAc17rsa-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/display/drm_hdmi_state_helper.c:924:17: error: use of undeclared identifier 'it'
     924 |                 dev_warn_once(it->dev, "unsupported HDMI infoframe 0x%x\n", frame->any.type);
         |                               ^
>> drivers/gpu/drm/display/drm_hdmi_state_helper.c:924:63: error: use of undeclared identifier 'frame'
     924 |                 dev_warn_once(it->dev, "unsupported HDMI infoframe 0x%x\n", frame->any.type);
         |                                                                             ^
   drivers/gpu/drm/display/drm_hdmi_state_helper.c:953:17: error: use of undeclared identifier 'it'
     953 |                 dev_warn_once(it->dev, "unsupported HDMI infoframe 0x%x\n", frame->any.type);
         |                               ^
   3 errors generated.


vim +/it +924 drivers/gpu/drm/display/drm_hdmi_state_helper.c

   916	
   917	static int clear_infoframe(struct drm_connector *connector,
   918				   struct drm_connector_hdmi_infoframe *old_frame)
   919	{
   920		int ret;
   921	
   922		ret = clear_device_infoframe(connector, old_frame->data.any.type);
   923		if (ret == -EOPNOTSUPP)
 > 924			dev_warn_once(it->dev, "unsupported HDMI infoframe 0x%x\n", frame->any.type);
   925		if (ret)
   926			return ret;
   927	
   928		return 0;
   929	}
   930	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki