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drm/amd/display: add aux arbitration logic

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Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Charlene Liu 2017-08-24 17:12:48 -04:00 committed by Alex Deucher
parent 4ed4e51b19
commit ceda4e9800
3 changed files with 36 additions and 2 deletions
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6
drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c
View File

@ -69,6 +69,12 @@ bool dal_aux_engine_acquire(
struct aux_engine *aux_engine = FROM_ENGINE(engine);
enum gpio_result result;
if (aux_engine->funcs->is_engine_available) {
/*check whether SW could use the engine*/
if (!aux_engine->funcs->is_engine_available(aux_engine)) {
return false;
}
}
result = dal_ddc_open(ddc, GPIO_MODE_HARDWARE,
GPIO_DDC_CONFIG_TYPE_MODE_AUX);

2
drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.h
View File

@ -86,6 +86,8 @@ struct aux_engine_funcs {
enum aux_channel_operation_result (*get_channel_status)(
struct aux_engine *engine,
uint8_t *returned_bytes);
bool (*is_engine_available) (
struct aux_engine *engine);
};
struct aux_engine {

30
drivers/gpu/drm/amd/display/dc/i2caux/dce110/aux_engine_dce110.c
View File

@ -93,15 +93,36 @@ static void destroy(
}
#define SW_CAN_ACCESS_AUX 1
#define DMCU_CAN_ACCESS_AUX 2
static bool is_engine_available(
struct aux_engine *engine)
{
struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
uint32_t value = REG_READ(AUX_ARB_CONTROL);
uint32_t field = get_reg_field_value(
value,
AUX_ARB_CONTROL,
AUX_REG_RW_CNTL_STATUS);
return (field != DMCU_CAN_ACCESS_AUX);
}
static bool acquire_engine(
struct aux_engine *engine)
{
struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
uint32_t value = REG_READ(AUX_ARB_CONTROL);
uint32_t field = get_reg_field_value(
value,
AUX_ARB_CONTROL,
AUX_REG_RW_CNTL_STATUS);
if (field == DMCU_CAN_ACCESS_AUX)
return false;
/* enable AUX before request SW to access AUX */
uint32_t value = REG_READ(AUX_CONTROL);
uint32_t field = get_reg_field_value(value,
value = REG_READ(AUX_CONTROL);
field = get_reg_field_value(value,
AUX_CONTROL,
AUX_EN);
@ -395,6 +416,7 @@ static const struct aux_engine_funcs aux_engine_funcs = {
.submit_channel_request = submit_channel_request,
.process_channel_reply = process_channel_reply,
.get_channel_status = get_channel_status,
.is_engine_available = is_engine_available,
};
static const struct engine_funcs engine_funcs = {
@ -425,6 +447,10 @@ static bool construct(
static void destruct(
struct aux_engine_dce110 *engine)
{
struct aux_engine_dce110 *aux110 = engine;
/*temp w/a, to do*/
REG_UPDATE(AUX_ARB_CONTROL, AUX_DMCU_DONE_USING_AUX_REG, 1);
REG_UPDATE(AUX_ARB_CONTROL, AUX_SW_DONE_USING_AUX_REG, 1);
dal_aux_engine_destruct(&engine->base);
}