diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dce/dce_aux.c')
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 126 |
1 files changed, 109 insertions, 17 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c index c3f9f4185ce8..793c0cec407f 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c @@ -42,6 +42,10 @@ #include "reg_helper.h" +#undef FN +#define FN(reg_name, field_name) \ + aux110->shift->field_name, aux110->mask->field_name + #define FROM_AUX_ENGINE(ptr) \ container_of((ptr), struct aux_engine_dce110, base) @@ -55,6 +59,14 @@ enum { AUX_TIMED_OUT_RETRY_COUNTER = 2, AUX_DEFER_RETRY_COUNTER = 6 }; + +#define TIME_OUT_INCREMENT 1016 +#define TIME_OUT_MULTIPLIER_8 8 +#define TIME_OUT_MULTIPLIER_16 16 +#define TIME_OUT_MULTIPLIER_32 32 +#define TIME_OUT_MULTIPLIER_64 64 +#define MAX_TIMEOUT_LENGTH 127 + static void release_engine( struct dce_aux *engine) { @@ -198,7 +210,7 @@ static void submit_channel_request( REG_UPDATE(AUX_INTERRUPT_CONTROL, AUX_SW_DONE_ACK, 1); REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 0, - 10, aux110->timeout_period/10); + 10, aux110->polling_timeout_period/10); /* set the delay and the number of bytes to write */ @@ -327,7 +339,7 @@ static enum aux_channel_operation_result get_channel_status( /* poll to make sure that SW_DONE is asserted */ REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 1, - 10, aux110->timeout_period/10); + 10, aux110->polling_timeout_period/10); value = REG_READ(AUX_SW_STATUS); /* in case HPD is LOW, exit AUX transaction */ @@ -414,20 +426,77 @@ void dce110_engine_destroy(struct dce_aux **engine) *engine = NULL; } + +static bool dce_aux_configure_timeout(struct ddc_service *ddc, + uint32_t timeout_in_us) +{ + uint32_t multiplier = 0; + uint32_t length = 0; + struct ddc *ddc_pin = ddc->ddc_pin; + struct dce_aux *aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en]; + struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(aux_engine); + + /* 1-Update polling timeout period */ + aux110->polling_timeout_period = timeout_in_us * SW_AUX_TIMEOUT_PERIOD_MULTIPLIER; + + /* 2-Update aux timeout period length and multiplier */ + if (timeout_in_us <= TIME_OUT_INCREMENT) { + multiplier = 0; + length = timeout_in_us/TIME_OUT_MULTIPLIER_8; + if (timeout_in_us % TIME_OUT_MULTIPLIER_8 != 0) + length++; + } else if (timeout_in_us <= 2 * TIME_OUT_INCREMENT) { + multiplier = 1; + length = timeout_in_us/TIME_OUT_MULTIPLIER_16; + if (timeout_in_us % TIME_OUT_MULTIPLIER_16 != 0) + length++; + } else if (timeout_in_us <= 4 * TIME_OUT_INCREMENT) { + multiplier = 2; + length = timeout_in_us/TIME_OUT_MULTIPLIER_32; + if (timeout_in_us % TIME_OUT_MULTIPLIER_32 != 0) + length++; + } else if (timeout_in_us > 4 * TIME_OUT_INCREMENT) { + multiplier = 3; + length = timeout_in_us/TIME_OUT_MULTIPLIER_64; + if (timeout_in_us % TIME_OUT_MULTIPLIER_64 != 0) + length++; + } + + length = (length < MAX_TIMEOUT_LENGTH) ? length : MAX_TIMEOUT_LENGTH; + + REG_UPDATE_SEQ_2(AUX_DPHY_RX_CONTROL1, AUX_RX_TIMEOUT_LEN, length, AUX_RX_TIMEOUT_LEN_MUL, multiplier); + + return true; +} + +static struct dce_aux_funcs aux_functions = { + .configure_timeout = NULL, + .destroy = NULL, +}; + struct dce_aux *dce110_aux_engine_construct(struct aux_engine_dce110 *aux_engine110, struct dc_context *ctx, uint32_t inst, uint32_t timeout_period, - const struct dce110_aux_registers *regs) + const struct dce110_aux_registers *regs, + const struct dce110_aux_registers_mask *mask, + const struct dce110_aux_registers_shift *shift, + bool is_ext_aux_timeout_configurable) { aux_engine110->base.ddc = NULL; aux_engine110->base.ctx = ctx; aux_engine110->base.delay = 0; aux_engine110->base.max_defer_write_retry = 0; aux_engine110->base.inst = inst; - aux_engine110->timeout_period = timeout_period; + aux_engine110->polling_timeout_period = timeout_period; aux_engine110->regs = regs; + aux_engine110->mask = mask; + aux_engine110->shift = shift; + aux_engine110->base.funcs = &aux_functions; + if (is_ext_aux_timeout_configurable) + aux_engine110->base.funcs->configure_timeout = &dce_aux_configure_timeout; + return &aux_engine110->base; } @@ -464,8 +533,10 @@ int dce_aux_transfer_raw(struct ddc_service *ddc, memset(&aux_rep, 0, sizeof(aux_rep)); aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en]; - if (!acquire(aux_engine, ddc_pin)) + if (!acquire(aux_engine, ddc_pin)) { + *operation_result = AUX_CHANNEL_OPERATION_FAILED_ENGINE_ACQUIRE; return -1; + } if (payload->i2c_over_aux) aux_req.type = AUX_TRANSACTION_TYPE_I2C; @@ -475,7 +546,7 @@ int dce_aux_transfer_raw(struct ddc_service *ddc, aux_req.action = i2caux_action_from_payload(payload); aux_req.address = payload->address; - aux_req.delay = payload->defer_delay * 10; + aux_req.delay = 0; aux_req.length = payload->length; aux_req.data = payload->data; @@ -512,6 +583,8 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc, uint8_t reply; bool payload_reply = true; enum aux_channel_operation_result operation_result; + bool retry_on_defer = false; + int aux_ack_retries = 0, aux_defer_retries = 0, aux_i2c_defer_retries = 0, @@ -542,10 +615,19 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc, break; case AUX_TRANSACTION_REPLY_AUX_DEFER: - case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK: case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER: - if (++aux_defer_retries >= AUX_MAX_DEFER_RETRIES) + retry_on_defer = true; + /* fall through */ + case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK: + if (++aux_defer_retries >= AUX_MAX_DEFER_RETRIES) { goto fail; + } else { + if ((*payload->reply == AUX_TRANSACTION_REPLY_AUX_DEFER) || + (*payload->reply == AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER)) { + if (payload->defer_delay > 0) + msleep(payload->defer_delay); + } + } break; case AUX_TRANSACTION_REPLY_I2C_DEFER: @@ -569,19 +651,29 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc, break; case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT: - if (++aux_timeout_retries >= AUX_MAX_TIMEOUT_RETRIES) - goto fail; - else { - /* - * DP 1.4, 2.8.2: AUX Transaction Response/Reply Timeouts - * According to the DP spec there should be 3 retries total - * with a 400us wait inbetween each. Hardware already waits - * for 550us therefore no wait is required here. - */ + // Check whether a DEFER had occurred before the timeout. + // If so, treat timeout as a DEFER. + if (retry_on_defer) { + if (++aux_defer_retries >= AUX_MAX_DEFER_RETRIES) + goto fail; + else if (payload->defer_delay > 0) + msleep(payload->defer_delay); + } else { + if (++aux_timeout_retries >= AUX_MAX_TIMEOUT_RETRIES) + goto fail; + else { + /* + * DP 1.4, 2.8.2: AUX Transaction Response/Reply Timeouts + * According to the DP spec there should be 3 retries total + * with a 400us wait inbetween each. Hardware already waits + * for 550us therefore no wait is required here. + */ + } } break; case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON: + case AUX_CHANNEL_OPERATION_FAILED_ENGINE_ACQUIRE: case AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN: default: goto fail; |