[PATCH v4 06/14] drm/amd/display: get SAD from drm_eld when parsing EDID caps

[Mario Limonciello]

On 6/13/2025 9:58 AM, Melissa Wen wrote:
> drm_edid_connector_update() updates display info, filling ELD with audio
> info from Short-Audio Descriptors in the last step of
> update_dislay_info(). Our goal is stopping using raw edid, so we can
> extract SAD from drm_eld instead of access raw edid to get audio caps.
> 
> Signed-off-by: Melissa Wen <mwen at igalia.com>
Reviewed-by: Mario Limonciello <mario.limonciello at amd.com>
> ---
>   .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 22 ++++++++++---------
>   1 file changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> index 760da13612b9..10af9db47c39 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> @@ -33,6 +33,7 @@
>   #include <drm/drm_probe_helper.h>
>   #include <drm/amdgpu_drm.h>
>   #include <drm/drm_edid.h>
> +#include <drm/drm_eld.h>
>   #include <drm/drm_fixed.h>
>   
>   #include "dm_services.h"
> @@ -105,9 +106,7 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
>   	struct edid *edid_buf = edid ? (struct edid *) edid->raw_edid : NULL;
>   	const struct drm_edid *drm_edid;
>   	struct drm_edid_product_id product_id;
> -	struct cea_sad *sads;
> -	int sad_count = -1;
> -	int sadb_count = -1;
> +	int sad_count, sadb_count;
>   	int i = 0;
>   	uint8_t *sadb = NULL;
>   	enum dc_edid_status result = EDID_OK;
> @@ -121,6 +120,7 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
>   	if (!drm_edid_valid(drm_edid))
>   		result = EDID_BAD_CHECKSUM;
>   
> +	drm_edid_connector_update(connector, drm_edid);
>   	drm_edid_get_product_id(drm_edid, &product_id);
>   
>   	edid_caps->manufacturer_id = product_id.manufacturer_name;
> @@ -137,7 +137,7 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
>   
>   	apply_edid_quirks(dev, drm_edid, edid_caps);
>   
> -	sad_count = drm_edid_to_sad((struct edid *) edid->raw_edid, &sads);
> +	sad_count = drm_eld_sad_count(connector->eld);
>   	if (sad_count <= 0) {
>   		drm_edid_free(drm_edid);
>   		return result;
> @@ -145,12 +145,15 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
>   
>   	edid_caps->audio_mode_count = min(sad_count, DC_MAX_AUDIO_DESC_COUNT);
>   	for (i = 0; i < edid_caps->audio_mode_count; ++i) {
> -		struct cea_sad *sad = &sads[i];
> +		struct cea_sad sad;
>   
> -		edid_caps->audio_modes[i].format_code = sad->format;
> -		edid_caps->audio_modes[i].channel_count = sad->channels + 1;
> -		edid_caps->audio_modes[i].sample_rate = sad->freq;
> -		edid_caps->audio_modes[i].sample_size = sad->byte2;
> +		if (drm_eld_sad_get(connector->eld, i, &sad) < 0)
> +			continue;
> +
> +		edid_caps->audio_modes[i].format_code = sad.format;
> +		edid_caps->audio_modes[i].channel_count = sad.channels + 1;
> +		edid_caps->audio_modes[i].sample_rate = sad.freq;
> +		edid_caps->audio_modes[i].sample_size = sad.byte2;
>   	}
>   
>   	sadb_count = drm_edid_to_speaker_allocation((struct edid *) edid->raw_edid, &sadb);
> @@ -165,7 +168,6 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
>   	else
>   		edid_caps->speaker_flags = DEFAULT_SPEAKER_LOCATION;
>   
> -	kfree(sads);
>   	kfree(sadb);
>   	drm_edid_free(drm_edid);
>