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drm/amd/display: Allow embedded connectors without DDC

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On some laptops, the embedded panel may not have
a DDC (display data channel) available. On these,
the EDID may be hardcoded in ACPI or the VBIOS.

In this case, use GPIO_DDC_LINE_UNKNOWN and don't fail.

Fixes: def3488eb0 ("drm/amd/display: refactor HPD to increase flexibility")
Link: https://gitlab.freedesktop.org/drm/amd/-/work_items/5192
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 75b8a6ca0e8bc3ce24572f854e95f8721b321179)
This commit is contained in:
Timur Kristóf 2026-04-28 13:40:40 +02:00 committed by Alex Deucher
parent a1fc7bf667
commit 494941aa77
3 changed files with 7 additions and 2 deletions
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2
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -1682,7 +1682,7 @@ struct dc_scratch_space {
struct dc_link_training_overrides preferred_training_settings;
struct dp_audio_test_data audio_test_data;
uint8_t ddc_hw_inst;
enum gpio_ddc_line ddc_hw_inst;
uint8_t hpd_src;

3
drivers/gpu/drm/amd/display/dc/gpio/gpio_service.c
View File

@ -646,6 +646,9 @@ enum gpio_result dal_ddc_change_mode(
enum gpio_ddc_line dal_ddc_get_line(
const struct ddc *ddc)
{
if (!ddc)
return GPIO_DDC_LINE_UNKNOWN;
return (enum gpio_ddc_line)dal_gpio_get_enum(ddc->pin_data);
}

4
drivers/gpu/drm/amd/display/dc/link/link_factory.c
View File

@ -568,7 +568,9 @@ static bool construct_phy(struct dc_link *link,
goto ddc_create_fail;
}
if (!link->ddc->ddc_pin) {
/* Embedded display connectors such as LVDS may not have DDC. */
if (!link->ddc->ddc_pin &&
!dc_is_embedded_signal(link->connector_signal)) {
DC_ERROR("Failed to get I2C info for connector!\n");
goto ddc_create_fail;
}