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drm/amd/display: Add AUX I2C tracing.

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[Why]
Developers can find it useful if the driver can produce
AUX traces without special equipment.

[How]
Add AUX tracing.

Reviewed-by: Zhan Liu <zhan.liu@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Signed-off-by: Ashley Thomas <Ashley.Thomas2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ashley Thomas 2021-07-16 21:18:01 -07:00 committed by Alex Deucher
parent 04c1aad9fa
commit 56aca23093
1 changed files with 183 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

192
drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
View File

@ -42,6 +42,11 @@
#define DC_LOGGER \
engine->ctx->logger
#define DC_TRACE_LEVEL_MESSAGE(...) /* do nothing */
#define IS_DC_I2CAUX_LOGGING_ENABLED() (false)
#define LOG_FLAG_Error_I2cAux LOG_ERROR
#define LOG_FLAG_I2cAux_DceAux LOG_I2C_AUX
#include "reg_helper.h"
#undef FN
@ -623,6 +628,58 @@ int dce_aux_transfer_dmub_raw(struct ddc_service *ddc,
#define AUX_MAX_INVALID_REPLY_RETRIES 2
#define AUX_MAX_TIMEOUT_RETRIES 3
static void dce_aux_log_payload(const char *payload_name,
unsigned char *payload, uint32_t length, uint32_t max_length_to_log)
{
if (!IS_DC_I2CAUX_LOGGING_ENABLED())
return;
if (payload && length) {
char hex_str[128] = {0};
char *hex_str_ptr = &hex_str[0];
uint32_t hex_str_remaining = sizeof(hex_str);
unsigned char *payload_ptr = payload;
unsigned char *payload_max_to_log_ptr = payload_ptr + min(max_length_to_log, length);
unsigned int count;
char *padding = "";
while (payload_ptr < payload_max_to_log_ptr) {
count = snprintf_count(hex_str_ptr, hex_str_remaining, "%s%02X", padding, *payload_ptr);
padding = " ";
hex_str_remaining -= count;
hex_str_ptr += count;
payload_ptr++;
}
count = snprintf_count(hex_str_ptr, hex_str_remaining, " ");
hex_str_remaining -= count;
hex_str_ptr += count;
payload_ptr = payload;
while (payload_ptr < payload_max_to_log_ptr) {
count = snprintf_count(hex_str_ptr, hex_str_remaining, "%c",
*payload_ptr >= ' ' ? *payload_ptr : '.');
hex_str_remaining -= count;
hex_str_ptr += count;
payload_ptr++;
}
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_VERBOSE,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_log_payload: %s: length=%u: data: %s%s",
payload_name,
length,
hex_str,
(length > max_length_to_log ? " (...)" : " "));
} else {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_VERBOSE,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_log_payload: %s: length=%u: data: <empty payload>",
payload_name,
length);
}
}
bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
struct aux_payload *payload)
{
@ -648,7 +705,34 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
}
for (i = 0; i < AUX_MAX_RETRIES; i++) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: link_index=%u: START: retry %d of %d: address=0x%04x length=%u write=%d mot=%d",
ddc && ddc->link ? ddc->link->link_index : UINT_MAX,
i + 1,
(int)AUX_MAX_RETRIES,
payload->address,
payload->length,
(unsigned int) payload->write,
(unsigned int) payload->mot);
if (payload->write)
dce_aux_log_payload(" write", payload->data, payload->length, 16);
ret = dce_aux_transfer_raw(ddc, payload, &operation_result);
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: link_index=%u: END: retry %d of %d: address=0x%04x length=%u write=%d mot=%d: ret=%d operation_result=%d payload->reply=%u",
ddc && ddc->link ? ddc->link->link_index : UINT_MAX,
i + 1,
(int)AUX_MAX_RETRIES,
payload->address,
payload->length,
(unsigned int) payload->write,
(unsigned int) payload->mot,
ret,
(int)operation_result,
(unsigned int) *payload->reply);
if (!payload->write)
dce_aux_log_payload(" read", payload->data, ret > 0 ? ret : 0, 16);
switch (operation_result) {
case AUX_RET_SUCCESS:
@ -657,30 +741,64 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
switch (*payload->reply) {
case AUX_TRANSACTION_REPLY_AUX_ACK:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_AUX_ACK");
if (!payload->write && payload->length != ret) {
if (++aux_ack_retries >= AUX_MAX_RETRIES)
if (++aux_ack_retries >= AUX_MAX_RETRIES) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
LOG_FLAG_Error_I2cAux,
"dce_aux_transfer_with_retries: FAILURE: aux_ack_retries=%d >= AUX_MAX_RETRIES=%d",
aux_defer_retries,
AUX_MAX_RETRIES);
goto fail;
else
} else {
udelay(300);
}
} else
return true;
break;
case AUX_TRANSACTION_REPLY_AUX_DEFER:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_AUX_DEFER");
/* polling_timeout_period is in us */
defer_time_in_ms += aux110->polling_timeout_period / 1000;
++aux_defer_retries;
fallthrough;
case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER:
if (*payload->reply == AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER)
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER");
retry_on_defer = true;
fallthrough;
case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK:
if (*payload->reply == AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK)
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK");
if (aux_defer_retries >= AUX_MIN_DEFER_RETRIES
&& defer_time_in_ms >= AUX_MAX_DEFER_TIMEOUT_MS) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
LOG_FLAG_Error_I2cAux,
"dce_aux_transfer_with_retries: FAILURE: aux_defer_retries=%d >= AUX_MIN_DEFER_RETRIES=%d && defer_time_in_ms=%d >= AUX_MAX_DEFER_TIMEOUT_MS=%d",
aux_defer_retries,
AUX_MIN_DEFER_RETRIES,
defer_time_in_ms,
AUX_MAX_DEFER_TIMEOUT_MS);
goto fail;
} else {
if ((*payload->reply == AUX_TRANSACTION_REPLY_AUX_DEFER) ||
(*payload->reply == AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER)) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: payload->defer_delay=%u",
payload->defer_delay);
if (payload->defer_delay > 1) {
msleep(payload->defer_delay);
defer_time_in_ms += payload->defer_delay;
@ -693,37 +811,86 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
break;
case AUX_TRANSACTION_REPLY_I2C_DEFER:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_I2C_DEFER");
aux_defer_retries = 0;
if (++aux_i2c_defer_retries >= AUX_MAX_I2C_DEFER_RETRIES)
if (++aux_i2c_defer_retries >= AUX_MAX_I2C_DEFER_RETRIES) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
LOG_FLAG_Error_I2cAux,
"dce_aux_transfer_with_retries: FAILURE: aux_i2c_defer_retries=%d >= AUX_MAX_I2C_DEFER_RETRIES=%d",
aux_i2c_defer_retries,
AUX_MAX_I2C_DEFER_RETRIES);
goto fail;
}
break;
case AUX_TRANSACTION_REPLY_AUX_NACK:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_AUX_NACK");
goto fail;
case AUX_TRANSACTION_REPLY_HPD_DISCON:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_HPD_DISCON");
goto fail;
default:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
LOG_FLAG_Error_I2cAux,
"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: FAILURE: AUX_TRANSACTION_REPLY_* unknown, default case.");
goto fail;
}
break;
case AUX_RET_ERROR_INVALID_REPLY:
if (++aux_invalid_reply_retries >= AUX_MAX_INVALID_REPLY_RETRIES)
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_ERROR_INVALID_REPLY");
if (++aux_invalid_reply_retries >= AUX_MAX_INVALID_REPLY_RETRIES) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
LOG_FLAG_Error_I2cAux,
"dce_aux_transfer_with_retries: FAILURE: aux_invalid_reply_retries=%d >= AUX_MAX_INVALID_REPLY_RETRIES=%d",
aux_invalid_reply_retries,
AUX_MAX_INVALID_REPLY_RETRIES);
goto fail;
else
} else
udelay(400);
break;
case AUX_RET_ERROR_TIMEOUT:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: AUX_RET_ERROR_TIMEOUT");
// 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_MIN_DEFER_RETRIES)
if (++aux_defer_retries >= AUX_MIN_DEFER_RETRIES) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
LOG_FLAG_Error_I2cAux,
"dce_aux_transfer_with_retries: FAILURE: aux_defer_retries=%d >= AUX_MIN_DEFER_RETRIES=%d",
aux_defer_retries,
AUX_MIN_DEFER_RETRIES);
goto fail;
else if (payload->defer_delay > 0)
} else if (payload->defer_delay > 0) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: payload->defer_delay=%u",
payload->defer_delay);
msleep(payload->defer_delay);
}
} else {
if (++aux_timeout_retries >= AUX_MAX_TIMEOUT_RETRIES)
if (++aux_timeout_retries >= AUX_MAX_TIMEOUT_RETRIES) {
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
LOG_FLAG_Error_I2cAux,
"dce_aux_transfer_with_retries: FAILURE: aux_timeout_retries=%d >= AUX_MAX_TIMEOUT_RETRIES=%d",
aux_timeout_retries,
AUX_MAX_TIMEOUT_RETRIES);
goto fail;
else {
} else {
/*
* DP 1.4, 2.8.2: AUX Transaction Response/Reply Timeouts
* According to the DP spec there should be 3 retries total
@ -738,11 +905,18 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
case AUX_RET_ERROR_ENGINE_ACQUIRE:
case AUX_RET_ERROR_UNKNOWN:
default:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
LOG_FLAG_I2cAux_DceAux,
"dce_aux_transfer_with_retries: Failure: operation_result=%d",
(int)operation_result);
goto fail;
}
}
fail:
DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
LOG_FLAG_Error_I2cAux,
"dce_aux_transfer_with_retries: FAILURE");
if (!payload_reply)
payload->reply = NULL;