[PATCH v2] drm/connector: hdmi: Increase HDMI_MAX_INFOFRAME_SIZE to 30

[Derek Foreman]

The largest infoframe we create is the DRM (Dynamic Range Mastering)
infoframe which is 26 bytes + a 4 byte header, for a total of 30
bytes.

With HDMI_MAX_INFOFRAME_SIZE set to 29 bytes, as it is now, we
allocate too little space to pack a DRM infoframe in
write_device_infoframe(), leading to an ENOSPC return from
hdmi_infoframe_pack(), and never calling the connector's
write_infoframe() vfunc.

Increase HDMI_MAX_INFOFRAME_SIZE to 30 so we can successfully
write DRM infoframes.

The drm_debugfs code is similarly updated.

Signed-off-by: Derek Foreman <derek.foreman at collabora.com>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 2 +-
 drivers/gpu/drm/drm_debugfs.c                   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 7854820089ec..cc7747d33fdf 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -521,7 +521,7 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
 }
 EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check);
 
-#define HDMI_MAX_INFOFRAME_SIZE		29
+#define HDMI_MAX_INFOFRAME_SIZE		30
 
 static int clear_device_infoframe(struct drm_connector *connector,
 				  enum hdmi_infoframe_type type)
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 6b239a24f1df..3439fd65275a 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -520,7 +520,7 @@ static const struct file_operations drm_connector_fops = {
 	.write = connector_write
 };
 
-#define HDMI_MAX_INFOFRAME_SIZE		29
+#define HDMI_MAX_INFOFRAME_SIZE		30
 
 static ssize_t
 audio_infoframe_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos)
-- 
2.45.2