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drm/eld: add helpers to modify the SADs of an ELD

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Occasionally it's necessary for drivers to modify the SADs of an ELD,
but it's not so cool to have drivers poke at the ELD buffer directly.

Using the helpers to translate between 3-byte SAD and struct cea_sad,
add ELD helpers to get/set the SADs from/to an ELD.

v2: s/i/sad_index/ (Mitul)

Cc: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/8e9a05f2b1e0dd184132d636e1e778e8917ec25d.1698747331.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2023-10-31 12:16:43 +02:00
parent 8af4681189
commit f415a6078f
4 changed files with 64 additions and 0 deletions
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3
Documentation/gpu/drm-kms-helpers.rst
View File

@ -366,6 +366,9 @@ EDID Helper Functions Reference
.. kernel-doc:: include/drm/drm_eld.h
:internal:
.. kernel-doc:: drivers/gpu/drm/drm_eld.c
:export:
SCDC Helper Functions Reference
===============================

1
drivers/gpu/drm/Makefile
View File

@ -22,6 +22,7 @@ drm-y := \
drm_drv.o \
drm_dumb_buffers.o \
drm_edid.o \
drm_eld.o \
drm_encoder.o \
drm_file.o \
drm_fourcc.o \

55
drivers/gpu/drm/drm_eld.c Normal file
View File

@ -0,0 +1,55 @@
// SPDX-License-Identifier: MIT
/*
* Copyright © 2023 Intel Corporation
*/
#include <drm/drm_edid.h>
#include <drm/drm_eld.h>
#include "drm_internal.h"
/**
* drm_eld_sad_get - get SAD from ELD to struct cea_sad
* @eld: ELD buffer
* @sad_index: SAD index
* @cta_sad: destination struct cea_sad
*
* @return: 0 on success, or negative on errors
*/
int drm_eld_sad_get(const u8 *eld, int sad_index, struct cea_sad *cta_sad)
{
const u8 *sad;
if (sad_index >= drm_eld_sad_count(eld))
return -EINVAL;
sad = eld + DRM_ELD_CEA_SAD(drm_eld_mnl(eld), sad_index);
drm_edid_cta_sad_set(cta_sad, sad);
return 0;
}
EXPORT_SYMBOL(drm_eld_sad_get);
/**
* drm_eld_sad_set - set SAD to ELD from struct cea_sad
* @eld: ELD buffer
* @sad_index: SAD index
* @cta_sad: source struct cea_sad
*
* @return: 0 on success, or negative on errors
*/
int drm_eld_sad_set(u8 *eld, int sad_index, const struct cea_sad *cta_sad)
{
u8 *sad;
if (sad_index >= drm_eld_sad_count(eld))
return -EINVAL;
sad = eld + DRM_ELD_CEA_SAD(drm_eld_mnl(eld), sad_index);
drm_edid_cta_sad_get(cta_sad, sad);
return 0;
}
EXPORT_SYMBOL(drm_eld_sad_set);

5
include/drm/drm_eld.h
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@ -8,6 +8,8 @@
#include <linux/types.h>
struct cea_sad;
/* ELD Header Block */
#define DRM_ELD_HEADER_BLOCK_SIZE 4
@ -75,6 +77,9 @@ static inline int drm_eld_mnl(const u8 *eld)
return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;
}
int drm_eld_sad_get(const u8 *eld, int sad_index, struct cea_sad *cta_sad);
int drm_eld_sad_set(u8 *eld, int sad_index, const struct cea_sad *cta_sad);
/**
* drm_eld_sad - Get ELD SAD structures.
* @eld: pointer to an eld memory structure with sad_count set