[PATCH v6 14/14] drm/amd/display: move dc_sink from dc_edid to drm_edid
Harry Wentland
harry.wentland at amd.com
Mon Aug 11 21:29:14 UTC 2025
On 2025-07-25 20:33, Melissa Wen wrote:
> Reduce direct handling of edid data by resorting to drm helpers that
> deal with this info inside drm_edid infrastructure.
>
> v3:
> - use dc_edid_sink_edid_free in link_detection
>
> v5:
> - no need of drm_edid duplication (Mario)
> - fix mem leak on dc_sink->drm_edid
>
> v6:
> - fix NULL pointer dereference (Alex H)
>
> Signed-off-by: Melissa Wen <mwen at igalia.com>
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 26 ++++++---------
> .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 31 ++++++------------
> .../display/amdgpu_dm/amdgpu_dm_mst_types.c | 21 ++++--------
> .../gpu/drm/amd/display/amdgpu_dm/dc_edid.c | 32 +++++++++++--------
> .../gpu/drm/amd/display/amdgpu_dm/dc_edid.h | 1 +
> .../drm/amd/display/dc/link/link_detection.c | 3 +-
> 6 files changed, 48 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 878269c2092c..1aa0ccf74580 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -68,6 +68,7 @@
> #endif
> #include "amdgpu_dm_psr.h"
> #include "amdgpu_dm_replay.h"
> +#include "dc_edid.h"
>
> #include "ivsrcid/ivsrcid_vislands30.h"
>
> @@ -3743,6 +3744,8 @@ void amdgpu_dm_update_connector_after_detect(
> * 2. Send an event and let userspace tell us what to do
> */
> if (sink) {
> + const struct drm_edid *drm_edid = sink->drm_edid;
> +
> /*
> * TODO: check if we still need the S3 mode update workaround.
> * If yes, put it here.
> @@ -3754,16 +3757,15 @@ void amdgpu_dm_update_connector_after_detect(
>
> aconnector->dc_sink = sink;
> dc_sink_retain(aconnector->dc_sink);
> - if (sink->dc_edid.length == 0) {
> +
> + if (!drm_edid_valid(drm_edid)) {
> aconnector->drm_edid = NULL;
> hdmi_cec_unset_edid(aconnector);
> if (aconnector->dc_link->aux_mode) {
> drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
> }
> } else {
> - const struct edid *edid = (const struct edid *)sink->dc_edid.raw_edid;
> -
> - aconnector->drm_edid = drm_edid_alloc(edid, sink->dc_edid.length);
> + aconnector->drm_edid = drm_edid_dup(sink->drm_edid);
> drm_edid_connector_update(connector, aconnector->drm_edid);
>
> hdmi_cec_set_edid(aconnector);
> @@ -7434,12 +7436,8 @@ static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
> aconnector->drm_edid = drm_edid;
> /* Update emulated (virtual) sink's EDID */
> if (dc_em_sink && dc_link) {
> - // FIXME: Get rid of drm_edid_raw()
> - const struct edid *edid = drm_edid_raw(drm_edid);
> -
> memset(&dc_em_sink->edid_caps, 0, sizeof(struct dc_edid_caps));
> - memmove(dc_em_sink->dc_edid.raw_edid, edid,
> - (edid->extensions + 1) * EDID_LENGTH);
> + dc_edid_copy_edid_to_dc(dc_em_sink, drm_edid, 0);
> dm_helpers_parse_edid_caps(dc_link, dc_em_sink);
> }
> }
> @@ -7472,7 +7470,6 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
> .sink_signal = SIGNAL_TYPE_VIRTUAL
> };
> const struct drm_edid *drm_edid;
> - const struct edid *edid;
> struct i2c_adapter *ddc;
>
> if (dc_link && dc_link->aux_mode)
> @@ -7492,12 +7489,9 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
>
> aconnector->drm_edid = drm_edid;
>
> - edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
> - aconnector->dc_em_sink = dc_link_add_remote_sink(
> - aconnector->dc_link,
> - (uint8_t *)edid,
> - (edid->extensions + 1) * EDID_LENGTH,
> - &init_params);
> + aconnector->dc_em_sink = dc_link_add_remote_sink(aconnector->dc_link,
> + drm_edid, 0,
> + &init_params);
>
> if (aconnector->base.force == DRM_FORCE_ON) {
> aconnector->dc_sink = aconnector->dc_link->local_sink ?
> 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 d4d60d62964c..288e87f92f9e 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
> @@ -48,6 +48,7 @@
> #include "dm_helpers.h"
> #include "ddc_service_types.h"
> #include "clk_mgr.h"
> +#include "dc_edid.h"
>
> static void apply_edid_quirks(struct drm_device *dev,
> const struct drm_edid *drm_edid,
> @@ -100,20 +101,16 @@ enum dc_edid_status dm_helpers_parse_edid_caps(struct dc_link *link,
> struct amdgpu_dm_connector *aconnector = link->priv;
> struct drm_connector *connector = &aconnector->base;
> struct drm_device *dev = connector->dev;
> - struct edid *edid_buf;
> - const struct drm_edid *drm_edid;
> + const struct drm_edid *drm_edid = sink->drm_edid;
> struct drm_edid_product_id product_id;
> struct dc_edid_caps *edid_caps = &sink->edid_caps;
> int sad_count;
> int i = 0;
> enum dc_edid_status result = EDID_OK;
>
> - edid_buf = (struct edid *) &sink->dc_edid.raw_edid;
> - if (!edid_caps || !edid_buf)
> + if (!edid_caps || !drm_edid)
> return EDID_BAD_INPUT;
>
> - drm_edid = drm_edid_alloc(edid_buf, EDID_LENGTH * (edid_buf->extensions + 1));
> -
> if (!drm_edid_valid(drm_edid))
> result = EDID_BAD_CHECKSUM;
>
> @@ -135,10 +132,8 @@ enum dc_edid_status dm_helpers_parse_edid_caps(struct dc_link *link,
> apply_edid_quirks(dev, drm_edid, edid_caps);
>
> sad_count = drm_eld_sad_count(connector->eld);
> - if (sad_count <= 0) {
> - drm_edid_free(drm_edid);
> + if (sad_count <= 0)
> return result;
> - }
>
> edid_caps->audio_mode_count = min(sad_count, DC_MAX_AUDIO_DESC_COUNT);
> for (i = 0; i < edid_caps->audio_mode_count; ++i) {
> @@ -158,8 +153,6 @@ enum dc_edid_status dm_helpers_parse_edid_caps(struct dc_link *link,
> else
> edid_caps->speaker_flags = DEFAULT_SPEAKER_LOCATION;
>
> - drm_edid_free(drm_edid);
> -
> return result;
> }
>
> @@ -991,7 +984,6 @@ enum dc_edid_status dm_helpers_read_local_edid(
> int retry = 3;
> enum dc_edid_status edid_status;
> const struct drm_edid *drm_edid;
> - const struct edid *edid;
>
> if (link->aux_mode)
> ddc = &aconnector->dm_dp_aux.aux.ddc;
> @@ -1002,6 +994,8 @@ enum dc_edid_status dm_helpers_read_local_edid(
> * do check sum and retry to make sure read correct edid.
> */
> do {
> + drm_edid_free(sink->drm_edid);
> +
> drm_edid = dm_helpers_read_acpi_edid(aconnector);
> if (drm_edid)
> drm_info(connector->dev, "Using ACPI provided EDID for %s\n", connector->name);
> @@ -1021,16 +1015,7 @@ enum dc_edid_status dm_helpers_read_local_edid(
> if (!drm_edid)
> return EDID_NO_RESPONSE;
>
> - edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
> - if (!edid ||
> - edid->extensions >= sizeof(sink->dc_edid.raw_edid) / EDID_LENGTH)
> - return EDID_BAD_INPUT;
> -
> - sink->dc_edid.length = EDID_LENGTH * (edid->extensions + 1);
> - memmove(sink->dc_edid.raw_edid, (uint8_t *)edid, sink->dc_edid.length);
> -
> - /* We don't need the original edid anymore */
> - drm_edid_free(drm_edid);
> + sink->drm_edid = drm_edid;
>
> edid_status = dm_helpers_parse_edid_caps(link, sink);
>
> @@ -1055,6 +1040,8 @@ enum dc_edid_status dm_helpers_read_local_edid(
>
> test_response.bits.EDID_CHECKSUM_WRITE = 1;
>
> + // TODO: drm_edid doesn't have a helper for dp_write_dpcd yet
> + dc_edid_copy_edid_to_sink(sink);
> dm_helpers_dp_write_dpcd(ctx,
> link,
> DP_TEST_EDID_CHECKSUM,
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 7187d5aedf0a..5ca3e668c8aa 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -359,12 +359,10 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
> .link = aconnector->dc_link,
> .sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
>
> - dc_sink = dc_link_add_remote_sink(
> - aconnector->dc_link,
> - NULL,
> - 0,
> - &init_params);
> -
> + dc_sink = dc_link_add_remote_sink(aconnector->dc_link,
> + NULL,
> + 0,
> + &init_params);
> if (!dc_sink) {
> DRM_ERROR("Unable to add a remote sink\n");
> return 0;
> @@ -397,15 +395,10 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
> struct dc_sink_init_data init_params = {
> .link = aconnector->dc_link,
> .sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
> - const struct edid *edid;
> -
> - edid = drm_edid_raw(aconnector->drm_edid); // FIXME: Get rid of drm_edid_raw()
> - dc_sink = dc_link_add_remote_sink(
> - aconnector->dc_link,
> - (uint8_t *)edid,
> - (edid->extensions + 1) * EDID_LENGTH,
> - &init_params);
>
> + dc_sink = dc_link_add_remote_sink(aconnector->dc_link,
> + aconnector->drm_edid, 0,
> + &init_params);
> if (!dc_sink) {
> DRM_ERROR("Unable to add a remote sink\n");
> return 0;
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.c b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.c
> index 493815829aa5..d89a82c349fa 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.c
> @@ -6,25 +6,31 @@
> bool dc_edid_is_same_edid(struct dc_sink *prev_sink,
> struct dc_sink *current_sink)
> {
> - struct dc_edid *old_edid = &prev_sink->dc_edid;
> - struct dc_edid *new_edid = ¤t_sink->dc_edid;
> -
> - if (old_edid->length != new_edid->length)
> - return false;
> -
> - if (new_edid->length == 0)
> - return false;
> -
> - return (memcmp(old_edid->raw_edid,
> - new_edid->raw_edid, new_edid->length) == 0);
> + return drm_edid_eq(prev_sink->drm_edid, current_sink->drm_edid);
DC is OS agnostic. There is no drm_ on other OSes.
> }
>
> void dc_edid_copy_edid_to_dc(struct dc_sink *dc_sink,
> const void *edid,
> int len)
> {
> - memmove(dc_sink->dc_edid.raw_edid, edid, len);
> - dc_sink->dc_edid.length = len;
> + dc_sink->drm_edid = drm_edid_dup((const struct drm_edid *) edid);
Same here.
> +}
> +
> +void dc_edid_copy_edid_to_sink(struct dc_sink *sink)
> +{
> + const struct edid *edid;
> +
> + edid = drm_edid_raw(sink->drm_edid); // FIXME: Get rid of drm_edid_raw()
And here.
Harry
> + if (!edid ||
> + edid->extensions >= sizeof(sink->dc_edid.raw_edid) / EDID_LENGTH) {
> + memset(sink->dc_edid.raw_edid, 0, sizeof(sink->dc_edid.raw_edid));
> + sink->dc_edid.length = 0;
> + return;
> + }
> +
> + sink->dc_edid.length = EDID_LENGTH * (edid->extensions + 1);
> + memcpy(sink->dc_edid.raw_edid, (uint8_t *) edid,
> + sink->dc_edid.length);
> }
>
> void dc_edid_sink_edid_free(struct dc_sink *sink)
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.h b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.h
> index 2c76768be459..a95cc6ccc743 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.h
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_edid.h
> @@ -9,6 +9,7 @@ bool dc_edid_is_same_edid(struct dc_sink *prev_sink,
> struct dc_sink *current_sink);
> void dc_edid_copy_edid_to_dc(struct dc_sink *dc_sink,
> const void *edid, int len);
> +void dc_edid_copy_edid_to_sink(struct dc_sink *sink);
> void dc_edid_sink_edid_free(struct dc_sink *sink);
>
> #endif /* __DC_EDID_H__ */
> diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
> index 0fcdf803b7a0..5df87d39903e 100644
> --- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c
> +++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
> @@ -1134,6 +1134,7 @@ static bool detect_link_and_local_sink(struct dc_link *link,
> dp_trace_init(link);
>
> /* Connectivity log: detection */
> + dc_edid_copy_edid_to_sink(sink);
> for (i = 0; i < sink->dc_edid.length / DC_EDID_BLOCK_SIZE; i++) {
> CONN_DATA_DETECT(link,
> &sink->dc_edid.raw_edid[i * DC_EDID_BLOCK_SIZE],
> @@ -1416,7 +1417,7 @@ struct dc_sink *link_add_remote_sink(
> * parsing fails
> */
> if (edid_status != EDID_OK && edid_status != EDID_PARTIAL_VALID) {
> - dc_sink->dc_edid.length = 0;
> + dc_edid_sink_edid_free(dc_sink);
> dm_error("Bad EDID, status%d!\n", edid_status);
> }
>
More information about the dri-devel
mailing list