-----Original Message----- From: C, Ramalingam Sent: Thursday, January 31, 2019 12:29 PM To: intel-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; daniel.vetter@ffwll.ch; Winkler, Tomas tomas.winkler@intel.com; Shankar, Uma uma.shankar@intel.com Cc: C, Ramalingam ramalingam.c@intel.com Subject: [PATCH v10 10/40] 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]
Signed-off-by: Ramalingam C ramalingam.c@intel.com Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch
Looks ok to me. Reviewed-by: Uma Shankar uma.shankar@intel.com
include/drm/drm_hdcp.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index d6dfef8cff6a..7260b31af276 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -252,4 +252,22 @@ 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
2.7.4