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drm/amd/display: restore edid reading from a given i2c adapter

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When switching to drm_edid, we slightly changed how to get edid by
removing the possibility of getting them from dc_link when in aux
transaction mode. As MST doesn't initialize the connector with
`drm_connector_init_with_ddc()`, restore the original behavior to avoid
functional changes.

v2:
- Fix build warning of unchecked dereference (kernel test bot)

CC: Alex Hung <alex.hung@amd.com>
CC: Mario Limonciello <mario.limonciello@amd.com>
CC: Roman Li <Roman.Li@amd.com>
CC: Aurabindo Pillai <Aurabindo.Pillai@amd.com>
Fixes: 48edb2a425 ("drm/amd/display: switch amdgpu_dm_connector to use struct drm_edid")
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 81262b1656feb3813e3d917ab78824df6831e69e)
This commit is contained in:
Melissa Wen 2025-02-15 18:15:47 -03:00 • committed by Alex Deucher
parent 96989f3dca
commit 12f3b92d1c
1 changed files with 15 additions and 2 deletions
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17
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -7240,8 +7240,14 @@ static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
struct dc_link *dc_link = aconnector->dc_link;
struct dc_sink *dc_em_sink = aconnector->dc_em_sink;
const struct drm_edid *drm_edid;
struct i2c_adapter *ddc;
drm_edid = drm_edid_read(connector);
if (dc_link && dc_link->aux_mode)
ddc = &aconnector->dm_dp_aux.aux.ddc;
else
ddc = &aconnector->i2c->base;
drm_edid = drm_edid_read_ddc(connector, ddc);
drm_edid_connector_update(connector, drm_edid);
if (!drm_edid) {
DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
@ -7286,14 +7292,21 @@ static int get_modes(struct drm_connector *connector)
static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
{
struct drm_connector *connector = &aconnector->base;
struct dc_link *dc_link = aconnector->dc_link;
struct dc_sink_init_data init_params = {
.link = aconnector->dc_link,
.sink_signal = SIGNAL_TYPE_VIRTUAL
};
const struct drm_edid *drm_edid;
const struct edid *edid;
struct i2c_adapter *ddc;
drm_edid = drm_edid_read(connector);
if (dc_link && dc_link->aux_mode)
ddc = &aconnector->dm_dp_aux.aux.ddc;
else
ddc = &aconnector->i2c->base;
drm_edid = drm_edid_read_ddc(connector, ddc);
drm_edid_connector_update(connector, drm_edid);
if (!drm_edid) {
DRM_ERROR("No EDID found on connector: %s.\n", connector->name);