From a408c857a92be8b4f9932def15737ced02564e47 Mon Sep 17 00:00:00 2001 From: Manasi Navare Date: Tue, 27 Nov 2018 13:41:07 -0800 Subject: drm/dsc: Add helpers for DSC picture parameter set infoframes According to Display Stream compression spec 1.2, the picture parameter set metadata is sent from source to sink device using the DP Secondary data packet. An infoframe is formed for the PPS SDP header and PPS SDP payload bytes. This patch adds helpers to fill the PPS SDP header and PPS SDP payload according to the DSC 1.2 specification. v7: * Use BUILD_BUG_ON() to protect changing struct size (Ville) * Remove typecaseting (Ville) * Include byteorder.h in drm_dsc.c (Ville) * Correct kernel doc spacing (Anusha) v6: * Use proper sequence points for breaking down the assignments (Chris Wilson) * Use SPDX identifier v5: Do not use bitfields for DRM structs (Jani N) v4: * Use DSC constants for params that dont change across configurations v3: * Add reference to added kernel-docs in Documentation/gpu/drm-kms-helpers.rst (Daniel Vetter) v2: * Add EXPORT_SYMBOL for the drm functions (Manasi) Cc: dri-devel@lists.freedesktop.org Cc: Jani Nikula Cc: Ville Syrjala Cc: Anusha Srivatsa Cc: Harry Wentland Signed-off-by: Manasi Navare Acked-by: Harry Wentland Reviewed-by: Anusha Srivatsa Acked-by: Sean Paul (For merging through drm-intel) Link: https://patchwork.freedesktop.org/patch/msgid/20181127214125.17658-5-manasi.d.navare@intel.com --- include/drm/drm_dsc.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'include/drm/drm_dsc.h') diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h index b88e31bd9da7..52e57ceaff80 100644 --- a/include/drm/drm_dsc.h +++ b/include/drm/drm_dsc.h @@ -24,6 +24,23 @@ #define DSC_RC_TGT_OFFSET_HI_CONST 3 #define DSC_RC_TGT_OFFSET_LO_CONST 3 +/* DSC PPS constants and macros */ +#define DSC_PPS_VERSION_MAJOR_SHIFT 4 +#define DSC_PPS_BPC_SHIFT 4 +#define DSC_PPS_MSB_SHIFT 8 +#define DSC_PPS_LSB_MASK (0xFF << 0) +#define DSC_PPS_BPP_HIGH_MASK (0x3 << 8) +#define DSC_PPS_VBR_EN_SHIFT 2 +#define DSC_PPS_SIMPLE422_SHIFT 3 +#define DSC_PPS_CONVERT_RGB_SHIFT 4 +#define DSC_PPS_BLOCK_PRED_EN_SHIFT 5 +#define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK (0x3 << 8) +#define DSC_PPS_SCALE_DEC_INT_HIGH_MASK (0xF << 8) +#define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT 4 +#define DSC_PPS_RC_RANGE_MINQP_SHIFT 11 +#define DSC_PPS_RC_RANGE_MAXQP_SHIFT 6 +#define DSC_PPS_NATIVE_420_SHIFT 1 + /* Configuration for a single Rate Control model range */ struct drm_dsc_rc_range_parameters { /* Min Quantization Parameters allowed for this range */ @@ -458,4 +475,8 @@ struct drm_dsc_pps_infoframe { struct drm_dsc_picture_parameter_set pps_payload; } __packed; +void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp); +void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp, + const struct drm_dsc_config *dsc_cfg); + #endif /* _DRM_DSC_H_ */ -- cgit v1.2.3