diff options
| author | Ramalingam C <ramalingam.c@intel.com> | 2019-02-15 14:05:04 +0530 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2019-02-15 18:56:35 +0100 |
| commit | 32097060189bf215439e719c5df514399235c52e (patch) | |
| tree | 04c82694f0d53fa18812b5fb6e32a57ea455d3f1 | |
| parent | 1bf7cb4d8f3d1f7388b230903cae35dfb43901d3 (diff) | |
drm: helper functions for hdcp2 seq_num to from u32
Library functions for endianness are aligned for 16/32/64 bits.
But hdcp sequence numbers are 24bits(big endian).
So for their conversion to and from u32 helper functions are developed.
v2:
Comment is updated. [Daniel]
Reviewed-by Uma.
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550219730-17734-10-git-send-email-ramalingam.c@intel.com
| -rw-r--r-- | include/drm/drm_hdcp.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index a6de09c5e47f..c21682f76cd3 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -250,4 +250,22 @@ struct hdcp2_dp_errata_stream_type { #define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2)) #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3)) +/* + * Helper functions to convert 24bit big endian hdcp sequence number to + * host format and back + */ +static inline +u32 drm_hdcp2_seq_num_to_u32(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN]) +{ + return (u32)(seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16); +} + +static inline +void drm_hdcp2_u32_to_seq_num(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN], u32 val) +{ + seq_num[0] = val >> 16; + seq_num[1] = val >> 8; + seq_num[2] = val; +} + #endif |