[PATCH 05/12] video/hdmi: Don't let the user of this API create invalid infoframes

Damien Lespiau
2013-08-14T17:19:08Z

To set the active aspect ratio value in the AVI infoframe today, you not
only have to set the active_aspect field, but also the active_info_valid
bit. Out of the 1 user of this API, we had 100% misuse, forgetting the
_valid bit. This was fixed in:

Author: Damien Lespiau <damien.lespiau@intel.com>
Date: Tue Aug 6 20:32:17 2013 +0100

drm: Don't generate invalid AVI infoframes for CEA modes

We can do better and derive the _valid bit from the user wanting to set
the active aspect ratio.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/drm_edid.c | 1 -
drivers/video/hdmi.c | 4 +++-
include/linux/hdmi.h | 1 -
3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 2381abd..d76d608 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3259,7 +3259,6 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
frame->video_code = drm_match_cea_mode(mode);

frame->picture_aspect = HDMI_PICTURE_ASPECT_NONE;
- frame->active_info_valid = 1;
frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;

return 0;
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 635d569..e36da36 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -96,7 +96,9 @@ ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer,

ptr[0] = ((frame->colorspace & 0x3) << 5) | (frame->scan_mode & 0x3);

- if (frame->active_info_valid)
+ /* Data byte 1, bit 4 has to be set if we provide the active format
+ * aspect ratio */
+ if (frame->active_aspect & 0xf)
ptr[0] |= BIT(4);

if (frame->horizontal_bar_valid)
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index bc6743e..931474c6 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -109,7 +109,6 @@ struct hdmi_avi_infoframe {
unsigned char version;
unsigned char length;
enum hdmi_colorspace colorspace;
- bool active_info_valid;
bool horizontal_bar_valid;
bool vertical_bar_valid;
enum hdmi_scan_mode scan_mode;
--
1.8.3.1

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