| Message ID | 20240827163918.48160-1-derek.foreman@collabora.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v4] drm/connector: hdmi: Fix writing Dynamic Range Mastering infoframes | expand |
On Tue, 27 Aug 2024 11:39:04 -0500, Derek Foreman wrote: > 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 > > [ ... ] Acked-by: Maxime Ripard <mripard@kernel.org> Thanks! Maxime
On Tue, 27 Aug 2024, Derek Foreman <derek.foreman@collabora.com> wrote: > 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 27 bytes - which is defined by the HDMI specification to be the > largest infoframe payload. > > Fixes: f378b77227bc ("drm/connector: hdmi: Add Infoframes generation") > Fixes: c602e4959a0c ("drm/connector: hdmi: Create Infoframe DebugFS entries") > Superfluous blank line. Can be fixed while applying. Reviewed-by: Jani Nikula <jani.nikula@intel.com> > Signed-off-by: Derek Foreman <derek.foreman@collabora.com> > --- > drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 +--- > drivers/gpu/drm/drm_debugfs.c | 4 +--- > include/linux/hdmi.h | 9 +++++++++ > 3 files changed, 11 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..455f855bc084 100644 > --- a/include/linux/hdmi.h > +++ b/include/linux/hdmi.h > @@ -59,6 +59,15 @@ enum hdmi_infoframe_type { > #define HDMI_DRM_INFOFRAME_SIZE 26 > #define HDMI_VENDOR_INFOFRAME_SIZE 4 > > +/* > + * HDMI 1.3a table 5-14 states that the largest InfoFrame_length is 27, > + * not including the packet header or checksum byte. We include the > + * checksum byte in HDMI_INFOFRAME_HEADER_SIZE, so this should allow > + * HDMI_INFOFRAME_SIZE(MAX) to be the largest buffer we could ever need > + * for any HDMI infoframe. > + */ > +#define HDMI_MAX_INFOFRAME_SIZE 27 > + > #define HDMI_INFOFRAME_SIZE(type) \ > (HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE)
Gentle ping - is there anything more I need to do before this can land? Thanks, Derek On 2024-08-28 03:31, Jani Nikula wrote: > On Tue, 27 Aug 2024, Derek Foreman <derek.foreman@collabora.com> wrote: >> 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 27 bytes - which is defined by the HDMI specification to be the >> largest infoframe payload. >> >> Fixes: f378b77227bc ("drm/connector: hdmi: Add Infoframes generation") >> Fixes: c602e4959a0c ("drm/connector: hdmi: Create Infoframe DebugFS entries") >> > Superfluous blank line. Can be fixed while applying. > > Reviewed-by: Jani Nikula <jani.nikula@intel.com> > > >> Signed-off-by: Derek Foreman <derek.foreman@collabora.com> >> --- >> drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 +--- >> drivers/gpu/drm/drm_debugfs.c | 4 +--- >> include/linux/hdmi.h | 9 +++++++++ >> 3 files changed, 11 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..455f855bc084 100644 >> --- a/include/linux/hdmi.h >> +++ b/include/linux/hdmi.h >> @@ -59,6 +59,15 @@ enum hdmi_infoframe_type { >> #define HDMI_DRM_INFOFRAME_SIZE 26 >> #define HDMI_VENDOR_INFOFRAME_SIZE 4 >> >> +/* >> + * HDMI 1.3a table 5-14 states that the largest InfoFrame_length is 27, >> + * not including the packet header or checksum byte. We include the >> + * checksum byte in HDMI_INFOFRAME_HEADER_SIZE, so this should allow >> + * HDMI_INFOFRAME_SIZE(MAX) to be the largest buffer we could ever need >> + * for any HDMI infoframe. >> + */ >> +#define HDMI_MAX_INFOFRAME_SIZE 27 >> + >> #define HDMI_INFOFRAME_SIZE(type) \ >> (HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE)
On Tue, 27 Aug 2024 11:39:04 -0500, Derek Foreman wrote: > 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. > > [...] Applied to misc/kernel.git (drm-misc-fixes). Thanks! Maxime
On Tue, Sep 24, 2024 at 04:13:08PM GMT, Maxime Ripard wrote: > On Tue, 27 Aug 2024 11:39:04 -0500, Derek Foreman wrote: > > 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. > > > > [...] > > Applied to misc/kernel.git (drm-misc-fixes). With an empty line between Fixes and the rest of the tags :-( > > Thanks! > Maxime >
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..455f855bc084 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -59,6 +59,15 @@ enum hdmi_infoframe_type { #define HDMI_DRM_INFOFRAME_SIZE 26 #define HDMI_VENDOR_INFOFRAME_SIZE 4 +/* + * HDMI 1.3a table 5-14 states that the largest InfoFrame_length is 27, + * not including the packet header or checksum byte. We include the + * checksum byte in HDMI_INFOFRAME_HEADER_SIZE, so this should allow + * HDMI_INFOFRAME_SIZE(MAX) to be the largest buffer we could ever need + * for any HDMI infoframe. + */ +#define HDMI_MAX_INFOFRAME_SIZE 27 + #define HDMI_INFOFRAME_SIZE(type) \ (HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE)
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 27 bytes - which is defined by the HDMI specification to be the largest infoframe payload. Fixes: f378b77227bc ("drm/connector: hdmi: Add Infoframes generation") Fixes: c602e4959a0c ("drm/connector: hdmi: Create Infoframe DebugFS entries") Signed-off-by: Derek Foreman <derek.foreman@collabora.com> --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 +--- drivers/gpu/drm/drm_debugfs.c | 4 +--- include/linux/hdmi.h | 9 +++++++++ 3 files changed, 11 insertions(+), 6 deletions(-)