From 8eb80946ab0c18a853be5f90d6b6ccbe3fd42989 Mon Sep 17 00:00:00 2001 From: Jani Nikula Date: Tue, 31 Oct 2023 12:16:38 +0200 Subject: drm/edid: split out drm_eld.h from drm_edid.h The drm_edid.[ch] files are starting to be a bit crowded, and with plans to add more ELD related functionality, it's perhaps cleanest to split the ELD code out to a header of its own. Include drm_eld.h from drm_edid.h for starters, and leave it to follow-up work to only include drm_eld.h where needed. Cc: Mitul Golani Reviewed-by: Mitul Golani Signed-off-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/0c6d631fa1058036d72dd25d1cabc90a7c52490e.1698747331.git.jani.nikula@intel.com --- include/drm/drm_eld.h | 159 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 159 insertions(+) create mode 100644 include/drm/drm_eld.h (limited to 'include/drm/drm_eld.h') diff --git a/include/drm/drm_eld.h b/include/drm/drm_eld.h new file mode 100644 index 000000000000..9bde89bd96ea --- /dev/null +++ b/include/drm/drm_eld.h @@ -0,0 +1,159 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright © 2023 Intel Corporation + */ + +#ifndef __DRM_ELD_H__ +#define __DRM_ELD_H__ + +#include + +/* ELD Header Block */ +#define DRM_ELD_HEADER_BLOCK_SIZE 4 + +#define DRM_ELD_VER 0 +# define DRM_ELD_VER_SHIFT 3 +# define DRM_ELD_VER_MASK (0x1f << 3) +# define DRM_ELD_VER_CEA861D (2 << 3) /* supports 861D or below */ +# define DRM_ELD_VER_CANNED (0x1f << 3) + +#define DRM_ELD_BASELINE_ELD_LEN 2 /* in dwords! */ + +/* ELD Baseline Block for ELD_Ver == 2 */ +#define DRM_ELD_CEA_EDID_VER_MNL 4 +# define DRM_ELD_CEA_EDID_VER_SHIFT 5 +# define DRM_ELD_CEA_EDID_VER_MASK (7 << 5) +# define DRM_ELD_CEA_EDID_VER_NONE (0 << 5) +# define DRM_ELD_CEA_EDID_VER_CEA861 (1 << 5) +# define DRM_ELD_CEA_EDID_VER_CEA861A (2 << 5) +# define DRM_ELD_CEA_EDID_VER_CEA861BCD (3 << 5) +# define DRM_ELD_MNL_SHIFT 0 +# define DRM_ELD_MNL_MASK (0x1f << 0) + +#define DRM_ELD_SAD_COUNT_CONN_TYPE 5 +# define DRM_ELD_SAD_COUNT_SHIFT 4 +# define DRM_ELD_SAD_COUNT_MASK (0xf << 4) +# define DRM_ELD_CONN_TYPE_SHIFT 2 +# define DRM_ELD_CONN_TYPE_MASK (3 << 2) +# define DRM_ELD_CONN_TYPE_HDMI (0 << 2) +# define DRM_ELD_CONN_TYPE_DP (1 << 2) +# define DRM_ELD_SUPPORTS_AI (1 << 1) +# define DRM_ELD_SUPPORTS_HDCP (1 << 0) + +#define DRM_ELD_AUD_SYNCH_DELAY 6 /* in units of 2 ms */ +# define DRM_ELD_AUD_SYNCH_DELAY_MAX 0xfa /* 500 ms */ + +#define DRM_ELD_SPEAKER 7 +# define DRM_ELD_SPEAKER_MASK 0x7f +# define DRM_ELD_SPEAKER_RLRC (1 << 6) +# define DRM_ELD_SPEAKER_FLRC (1 << 5) +# define DRM_ELD_SPEAKER_RC (1 << 4) +# define DRM_ELD_SPEAKER_RLR (1 << 3) +# define DRM_ELD_SPEAKER_FC (1 << 2) +# define DRM_ELD_SPEAKER_LFE (1 << 1) +# define DRM_ELD_SPEAKER_FLR (1 << 0) + +#define DRM_ELD_PORT_ID 8 /* offsets 8..15 inclusive */ +# define DRM_ELD_PORT_ID_LEN 8 + +#define DRM_ELD_MANUFACTURER_NAME0 16 +#define DRM_ELD_MANUFACTURER_NAME1 17 + +#define DRM_ELD_PRODUCT_CODE0 18 +#define DRM_ELD_PRODUCT_CODE1 19 + +#define DRM_ELD_MONITOR_NAME_STRING 20 /* offsets 20..(20+mnl-1) inclusive */ + +#define DRM_ELD_CEA_SAD(mnl, sad) (20 + (mnl) + 3 * (sad)) + +/** + * drm_eld_mnl - Get ELD monitor name length in bytes. + * @eld: pointer to an eld memory structure with mnl set + */ +static inline int drm_eld_mnl(const uint8_t *eld) +{ + return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT; +} + +/** + * drm_eld_sad - Get ELD SAD structures. + * @eld: pointer to an eld memory structure with sad_count set + */ +static inline const uint8_t *drm_eld_sad(const uint8_t *eld) +{ + unsigned int ver, mnl; + + ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT; + if (ver != 2 && ver != 31) + return NULL; + + mnl = drm_eld_mnl(eld); + if (mnl > 16) + return NULL; + + return eld + DRM_ELD_CEA_SAD(mnl, 0); +} + +/** + * drm_eld_sad_count - Get ELD SAD count. + * @eld: pointer to an eld memory structure with sad_count set + */ +static inline int drm_eld_sad_count(const uint8_t *eld) +{ + return (eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_SAD_COUNT_MASK) >> + DRM_ELD_SAD_COUNT_SHIFT; +} + +/** + * drm_eld_calc_baseline_block_size - Calculate baseline block size in bytes + * @eld: pointer to an eld memory structure with mnl and sad_count set + * + * This is a helper for determining the payload size of the baseline block, in + * bytes, for e.g. setting the Baseline_ELD_Len field in the ELD header block. + */ +static inline int drm_eld_calc_baseline_block_size(const uint8_t *eld) +{ + return DRM_ELD_MONITOR_NAME_STRING - DRM_ELD_HEADER_BLOCK_SIZE + + drm_eld_mnl(eld) + drm_eld_sad_count(eld) * 3; +} + +/** + * drm_eld_size - Get ELD size in bytes + * @eld: pointer to a complete eld memory structure + * + * The returned value does not include the vendor block. It's vendor specific, + * and comprises of the remaining bytes in the ELD memory buffer after + * drm_eld_size() bytes of header and baseline block. + * + * The returned value is guaranteed to be a multiple of 4. + */ +static inline int drm_eld_size(const uint8_t *eld) +{ + return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4; +} + +/** + * drm_eld_get_spk_alloc - Get speaker allocation + * @eld: pointer to an ELD memory structure + * + * The returned value is the speakers mask. User has to use %DRM_ELD_SPEAKER + * field definitions to identify speakers. + */ +static inline u8 drm_eld_get_spk_alloc(const uint8_t *eld) +{ + return eld[DRM_ELD_SPEAKER] & DRM_ELD_SPEAKER_MASK; +} + +/** + * drm_eld_get_conn_type - Get device type hdmi/dp connected + * @eld: pointer to an ELD memory structure + * + * The caller need to use %DRM_ELD_CONN_TYPE_HDMI or %DRM_ELD_CONN_TYPE_DP to + * identify the display type connected. + */ +static inline u8 drm_eld_get_conn_type(const uint8_t *eld) +{ + return eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_CONN_TYPE_MASK; +} + +#endif /* __DRM_ELD_H__ */ -- cgit