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drm/amd/display: add GPIO HW translation helpers

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Add generic helpers and lookup table types for GPIO hardware
translation.

The new helpers provide reusable conversions between GPIO IDs,
register offsets and DDC lines, allowing ASIC-specific drivers
to replace large switch statements with static lookup tables.

No functional changes intended.

Signed-off-by: Guilherme Ivo Bozi <guilherme.bozi@usp.br>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Acked-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Guilherme Ivo Bozi 2026-06-11 16:49:01 -03:00 committed by Alex Deucher
parent c696571585
commit 21b62d3a52
3 changed files with 155 additions and 0 deletions
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86
drivers/gpu/drm/amd/display/dc/gpio/hw_translate.c
View File

@ -133,3 +133,89 @@ bool dal_hw_translate_init(
return false;
}
}
bool dal_hw_translate_gpio_offset_to_id(
const struct gpio_id_offset_entry *table,
uint32_t table_size,
uint32_t offset,
uint32_t mask,
enum gpio_id *id,
uint32_t *en)
{
uint32_t i;
for (i = 0; i < table_size; i++) {
const struct gpio_id_offset_entry *entry = &table[i];
if (entry->offset != offset)
continue;
if (entry->check_mask && entry->mask != mask)
continue;
*id = entry->id;
*en = entry->en;
return true;
}
return false;
}
/* we don't care about the GPIO_ID for DDC
* in DdcHandle it will use GPIO_ID_DDC_DATA/GPIO_ID_DDC_CLOCK
* directly in the create method
*/
bool dal_hw_translate_gpio_ddc_offset_to_id(
const struct gpio_ddc_offset_entry *table,
uint32_t table_size,
uint32_t offset,
uint32_t *en)
{
uint32_t i;
for (i = 0; i < table_size; i++) {
const struct gpio_ddc_offset_entry *entry = &table[i];
if (entry->offset != offset)
continue;
*en = entry->en;
return true;
}
return false;
}
bool dal_hw_translate_id_to_offset(
const struct gpio_pin_entry *table,
uint32_t table_size,
enum gpio_id id,
uint32_t en,
struct gpio_pin_info *info)
{
uint32_t i;
for (i = 0; i < table_size; i++) {
const struct gpio_pin_entry *entry = &table[i];
if (entry->id != id || entry->en != en)
continue;
info->offset = entry->offset;
info->mask = entry->mask;
info->offset_y = info->offset + 2;
info->offset_en = info->offset + 1;
info->offset_mask = info->offset - 1;
info->mask_y = info->mask;
info->mask_en = info->mask;
info->mask_mask = info->mask;
return true;
}
return false;
}

21
drivers/gpu/drm/amd/display/dc/gpio/hw_translate.h
View File

@ -47,4 +47,25 @@ bool dal_hw_translate_init(
enum dce_version dce_version,
enum dce_environment dce_environment);
bool dal_hw_translate_gpio_offset_to_id(
const struct gpio_id_offset_entry *table,
uint32_t table_size,
uint32_t offset,
uint32_t mask,
enum gpio_id *id,
uint32_t *en);
bool dal_hw_translate_gpio_ddc_offset_to_id(
const struct gpio_ddc_offset_entry *table,
uint32_t table_size,
uint32_t offset,
uint32_t *en);
bool dal_hw_translate_id_to_offset(
const struct gpio_pin_entry *table,
uint32_t table_size,
enum gpio_id id,
uint32_t en,
struct gpio_pin_info *info);
#endif

48
drivers/gpu/drm/amd/display/include/gpio_types.h
View File

@ -277,6 +277,49 @@ enum gpio_config_type {
GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE
};
struct gpio_id_offset_entry {
uint32_t offset;
uint32_t mask;
bool check_mask;
enum gpio_id id;
uint32_t en;
};
#define GPIO_ENTRY(_offset, _id, _en) \
{ \
.offset = REG(_offset), \
.check_mask = false, \
.id = (_id), \
.en = (_en), \
}
#define GPIO_MASK_ENTRY(_offset, _mask, _id, _en) \
{ \
.offset = REG(_offset), \
.mask = (_mask), \
.check_mask = true, \
.id = (_id), \
.en = (_en), \
}
struct gpio_pin_entry {
enum gpio_id id;
uint32_t en;
uint32_t offset;
uint32_t mask;
};
#define GPIO_PIN_ENTRY(_id, _en, _offset, _mask) \
{ \
.id = (_id), \
.en = (_en), \
.offset = REG(_offset), \
.mask = (_mask), \
}
/* DDC configuration */
enum gpio_ddc_config_type {
@ -293,6 +336,11 @@ struct gpio_ddc_config {
bool clock_en_bit_present;
};
struct gpio_ddc_offset_entry {
uint32_t offset;
uint32_t en;
};
/* HPD configuration */
struct gpio_hpd_config {