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.
Instead of having HDMI_MAX_INFOFRAME_SIZE defined in two places,
replace HDMI_MAX_INFOFRAME_SIZE with HDMI_INFOFRAME_SIZE(MAX) and make
MAX the same size as the DRM infoframe.
Signed-off-by: Derek Foreman <derek.foreman@xxxxxxxxxxxxx>
---
drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 +---
drivers/gpu/drm/drm_debugfs.c | 4 +---
include/linux/hdmi.h | 3 +++
3 files changed, 5 insertions(+), 6 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..feb7a3a75981 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -521,8 +521,6 @@ 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
-
static int clear_device_infoframe(struct drm_connector *connector,
enum hdmi_infoframe_type type)
{
@@ -563,7 +561,7 @@ static int write_device_infoframe(struct drm_connector *connector,
{
const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs;
struct drm_device *dev = connector->dev;
- u8 buffer[HDMI_MAX_INFOFRAME_SIZE];
+ u8 buffer[HDMI_INFOFRAME_SIZE(MAX)];
int ret;
int len;
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 6b239a24f1df..9d3e6dd68810 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -520,8 +520,6 @@ static const struct file_operations drm_connector_fops = {
.write = connector_write
};
-#define HDMI_MAX_INFOFRAME_SIZE 29
-
static ssize_t
audio_infoframe_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos)
{
@@ -579,7 +577,7 @@ static ssize_t _f##_read_infoframe(struct file *filp, \
struct drm_connector *connector; \
union hdmi_infoframe *frame; \
struct drm_device *dev; \
- u8 buf[HDMI_MAX_INFOFRAME_SIZE]; \
+ u8 buf[HDMI_INFOFRAME_SIZE(MAX)]; \
ssize_t len = 0; \
\
connector = filp->private_data; \
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index 3bb87bf6bc65..3a442a59919e 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -59,6 +59,9 @@ enum hdmi_infoframe_type {
#define HDMI_DRM_INFOFRAME_SIZE 26
#define HDMI_VENDOR_INFOFRAME_SIZE 4
+/* The biggest infoframe size */
+#define HDMI_MAX_INFOFRAME_SIZE HDMI_DRM_INFOFRAME_SIZE
+
#define HDMI_INFOFRAME_SIZE(type) \
(HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE)
--
2.45.2
