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Subject[PATCH 3/4] drm/amd/display: code cleanup on dc_link from is_same_edid to get_ddc_line
Removes codestyle issues on the file dc_link between is_same_edid and
get_ddc_line as suggested by checkpatch.pl.

Types covered:

CHECK: Blank lines aren't necessary after an open brace '{'
CHECK: Blank lines aren't necessary before a close brace '}'
WARNING: braces {} are not necessary for single statement blocks
CHECK: Comparison to NULL could be written
CHECK: Lines should not end with a '('
CHECK: Alignment should match open parenthesis
CHECK: Using comparison to false is error prone
CHECK: Using comparison to true is error prone
WARNING: Avoid multiple line dereference - prefer 'link->dpcd_caps.sink_count.bits.SINK_COUNT'
CHECK: Unnecessary parentheses around
WARNING: Missing a blank line after declarations

Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 130 +++++++++---------
1 file changed, 62 insertions(+), 68 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 0b303d17e543..b5b202bd9d7c 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -677,12 +677,12 @@ static bool is_same_edid(struct dc_edid *old_edid, struct dc_edid *new_edid)
if (new_edid->length == 0)
return false;

- return (memcmp(old_edid->raw_edid, new_edid->raw_edid, new_edid->length) == 0);
+ return (memcmp(old_edid->raw_edid,
+ new_edid->raw_edid, new_edid->length) == 0);
}

static bool wait_for_alt_mode(struct dc_link *link)
{
-
/**
* something is terribly wrong if time out is > 200ms. (5Hz)
* 500 microseconds * 400 tries us 200 ms
@@ -697,7 +697,7 @@ static bool wait_for_alt_mode(struct dc_link *link)

DC_LOGGER_INIT(link->ctx->logger);

- if (link->link_enc->funcs->is_in_alt_mode == NULL)
+ if (!link->link_enc->funcs->is_in_alt_mode)
return true;

is_in_alt_mode = link->link_enc->funcs->is_in_alt_mode(link->link_enc);
@@ -712,21 +712,21 @@ static bool wait_for_alt_mode(struct dc_link *link)
udelay(sleep_time_in_microseconds);
/* ask the link if alt mode is enabled, if so return ok */
if (link->link_enc->funcs->is_in_alt_mode(link->link_enc)) {
-
finish_timestamp = dm_get_timestamp(link->ctx);
- time_taken_in_ns = dm_get_elapse_time_in_ns(
- link->ctx, finish_timestamp, enter_timestamp);
+ time_taken_in_ns =
+ dm_get_elapse_time_in_ns(link->ctx,
+ finish_timestamp,
+ enter_timestamp);
DC_LOG_WARNING("Alt mode entered finished after %llu ms\n",
div_u64(time_taken_in_ns, 1000000));
return true;
}
-
}
finish_timestamp = dm_get_timestamp(link->ctx);
time_taken_in_ns = dm_get_elapse_time_in_ns(link->ctx, finish_timestamp,
enter_timestamp);
DC_LOG_WARNING("Alt mode has timed out after %llu ms\n",
- div_u64(time_taken_in_ns, 1000000));
+ div_u64(time_taken_in_ns, 1000000));
return false;
}

@@ -762,30 +762,30 @@ static bool dc_link_detect_helper(struct dc_link *link,
return false;

if ((link->connector_signal == SIGNAL_TYPE_LVDS ||
- link->connector_signal == SIGNAL_TYPE_EDP) &&
- link->local_sink) {
-
+ link->connector_signal == SIGNAL_TYPE_EDP) &&
+ link->local_sink) {
// need to re-write OUI and brightness in resume case
if (link->connector_signal == SIGNAL_TYPE_EDP) {
dpcd_set_source_specific_data(link);
- dc_link_set_default_brightness_aux(link); //TODO: use cached
+ dc_link_set_default_brightness_aux(link);
+ //TODO: use cached
}

return true;
}

- if (false == dc_link_detect_sink(link, &new_connection_type)) {
+ if (!dc_link_detect_sink(link, &new_connection_type)) {
BREAK_TO_DEBUGGER();
return false;
}

prev_sink = link->local_sink;
- if (prev_sink != NULL) {
+ if (prev_sink) {
dc_sink_retain(prev_sink);
memcpy(&prev_dpcd_caps, &link->dpcd_caps, sizeof(struct dpcd_caps));
}
- link_disconnect_sink(link);

+ link_disconnect_sink(link);
if (new_connection_type != dc_connection_none) {
link->type = new_connection_type;
link->link_state_valid = false;
@@ -832,35 +832,31 @@ static bool dc_link_detect_helper(struct dc_link *link,
}

case SIGNAL_TYPE_DISPLAY_PORT: {
-
/* wa HPD high coming too early*/
if (link->link_enc->features.flags.bits.DP_IS_USB_C == 1) {
-
/* if alt mode times out, return false */
- if (wait_for_alt_mode(link) == false) {
+ if (!wait_for_alt_mode(link))
return false;
- }
}

- if (!detect_dp(
- link,
- &sink_caps,
- &converter_disable_audio,
- aud_support, reason)) {
- if (prev_sink != NULL)
+ if (!detect_dp(link, &sink_caps,
+ &converter_disable_audio,
+ aud_support, reason)) {
+ if (prev_sink)
dc_sink_release(prev_sink);
return false;
}

// Check if dpcp block is the same
- if (prev_sink != NULL) {
- if (memcmp(&link->dpcd_caps, &prev_dpcd_caps, sizeof(struct dpcd_caps)))
+ if (prev_sink) {
+ if (memcmp(&link->dpcd_caps, &prev_dpcd_caps,
+ sizeof(struct dpcd_caps)))
same_dpcd = false;
}
/* Active dongle downstream unplug*/
if (link->type == dc_connection_active_dongle &&
- link->dpcd_caps.sink_count.bits.SINK_COUNT == 0) {
- if (prev_sink != NULL)
+ link->dpcd_caps.sink_count.bits.SINK_COUNT == 0) {
+ if (prev_sink)
/* Downstream unplug */
dc_sink_release(prev_sink);
return true;
@@ -868,7 +864,7 @@ static bool dc_link_detect_helper(struct dc_link *link,

if (link->type == dc_connection_mst_branch) {
LINK_INFO("link=%d, mst branch is now Connected\n",
- link->link_index);
+ link->link_index);
/* Need to setup mst link_cap struct here
* otherwise dc_link_detect() will leave mst link_cap
* empty which leads to allocate_mst_payload() has "0"
@@ -876,15 +872,15 @@ static bool dc_link_detect_helper(struct dc_link *link,
*/
dp_verify_mst_link_cap(link);

- if (prev_sink != NULL)
+ if (prev_sink)
dc_sink_release(prev_sink);
return false;
}

// For seamless boot, to skip verify link cap, we read UEFI settings and set them as verified.
if (reason == DETECT_REASON_BOOT &&
- dc_ctx->dc->config.power_down_display_on_boot == false &&
- link->link_status.link_active == true)
+ !dc_ctx->dc->config.power_down_display_on_boot &&
+ link->link_status.link_active)
perform_dp_seamless_boot = true;

if (perform_dp_seamless_boot) {
@@ -897,24 +893,23 @@ static bool dc_link_detect_helper(struct dc_link *link,

default:
DC_ERROR("Invalid connector type! signal:%d\n",
- link->connector_signal);
- if (prev_sink != NULL)
+ link->connector_signal);
+ if (prev_sink)
dc_sink_release(prev_sink);
return false;
} /* switch() */

if (link->dpcd_caps.sink_count.bits.SINK_COUNT)
- link->dpcd_sink_count = link->dpcd_caps.sink_count.
- bits.SINK_COUNT;
+ link->dpcd_sink_count =
+ link->dpcd_caps.sink_count.bits.SINK_COUNT;
else
link->dpcd_sink_count = 1;

- dal_ddc_service_set_transaction_type(
- link->ddc,
- sink_caps.transaction_type);
+ dal_ddc_service_set_transaction_type(link->ddc,
+ sink_caps.transaction_type);

- link->aux_mode = dal_ddc_service_is_in_aux_transaction_mode(
- link->ddc);
+ link->aux_mode =
+ dal_ddc_service_is_in_aux_transaction_mode(link->ddc);

sink_init_data.link = link;
sink_init_data.sink_signal = sink_caps.signal;
@@ -922,7 +917,7 @@ static bool dc_link_detect_helper(struct dc_link *link,
sink = dc_sink_create(&sink_init_data);
if (!sink) {
DC_ERROR("Failed to create sink!\n");
- if (prev_sink != NULL)
+ if (prev_sink)
dc_sink_release(prev_sink);
return false;
}
@@ -933,10 +928,8 @@ static bool dc_link_detect_helper(struct dc_link *link,
/* dc_sink_create returns a new reference */
link->local_sink = sink;

- edid_status = dm_helpers_read_local_edid(
- link->ctx,
- link,
- sink);
+ edid_status = dm_helpers_read_local_edid(link->ctx,
+ link, sink);

switch (edid_status) {
case EDID_BAD_CHECKSUM:
@@ -944,7 +937,6 @@ static bool dc_link_detect_helper(struct dc_link *link,
break;
case EDID_NO_RESPONSE:
DC_LOG_ERROR("No EDID read.\n");
-
/*
* Abort detection for non-DP connectors if we have
* no EDID
@@ -955,7 +947,7 @@ static bool dc_link_detect_helper(struct dc_link *link,
*/
if (dc_is_hdmi_signal(link->connector_signal) ||
dc_is_dvi_signal(link->connector_signal)) {
- if (prev_sink != NULL)
+ if (prev_sink)
dc_sink_release(prev_sink);

return false;
@@ -968,14 +960,17 @@ static bool dc_link_detect_helper(struct dc_link *link,
link->ctx->dc->debug.disable_fec = true;

// Check if edid is the same
- if ((prev_sink != NULL) && ((edid_status == EDID_THE_SAME) || (edid_status == EDID_OK)))
- same_edid = is_same_edid(&prev_sink->dc_edid, &sink->dc_edid);
+ if ((prev_sink) &&
+ (edid_status == EDID_THE_SAME || edid_status == EDID_OK))
+ same_edid = is_same_edid(&prev_sink->dc_edid,
+ &sink->dc_edid);

if (sink->edid_caps.panel_patch.skip_scdc_overwrite)
link->ctx->dc->debug.hdmi20_disable = true;

if (link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
- sink_caps.transaction_type == DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
+ sink_caps.transaction_type ==
+ DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
/*
* TODO debug why Dell 2413 doesn't like
* two link trainings
@@ -984,29 +979,28 @@ static bool dc_link_detect_helper(struct dc_link *link,
// verify link cap for SST non-seamless boot
if (!perform_dp_seamless_boot)
dp_verify_link_cap_with_retries(link,
- &link->reported_link_cap,
- LINK_TRAINING_MAX_VERIFY_RETRY);
+ &link->reported_link_cap,
+ LINK_TRAINING_MAX_VERIFY_RETRY);
} else {
// If edid is the same, then discard new sink and revert back to original sink
if (same_edid) {
link_disconnect_remap(prev_sink, link);
sink = prev_sink;
prev_sink = NULL;
-
}
}

/* HDMI-DVI Dongle */
if (sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A &&
- !sink->edid_caps.edid_hdmi)
+ !sink->edid_caps.edid_hdmi)
sink->sink_signal = SIGNAL_TYPE_DVI_SINGLE_LINK;

/* Connectivity log: detection */
for (i = 0; i < sink->dc_edid.length / DC_EDID_BLOCK_SIZE; i++) {
CONN_DATA_DETECT(link,
- &sink->dc_edid.raw_edid[i * DC_EDID_BLOCK_SIZE],
- DC_EDID_BLOCK_SIZE,
- "%s: [Block %d] ", sink->edid_caps.display_name, i);
+ &sink->dc_edid.raw_edid[i * DC_EDID_BLOCK_SIZE],
+ DC_EDID_BLOCK_SIZE,
+ "%s: [Block %d] ", sink->edid_caps.display_name, i);
}

DC_LOG_DETECTION_EDID_PARSER("%s: "
@@ -1041,17 +1035,18 @@ static bool dc_link_detect_helper(struct dc_link *link,
sink->edid_caps.audio_modes[i].sample_rate,
sink->edid_caps.audio_modes[i].sample_size);
}
-
} else {
/* From Connected-to-Disconnected. */
if (link->type == dc_connection_mst_branch) {
LINK_INFO("link=%d, mst branch is now Disconnected\n",
- link->link_index);
+ link->link_index);

dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);

link->mst_stream_alloc_table.stream_count = 0;
- memset(link->mst_stream_alloc_table.stream_allocations, 0, sizeof(link->mst_stream_alloc_table.stream_allocations));
+ memset(link->mst_stream_alloc_table.stream_allocations,
+ 0,
+ sizeof(link->mst_stream_alloc_table.stream_allocations));
}

link->type = dc_connection_none;
@@ -1065,16 +1060,15 @@ static bool dc_link_detect_helper(struct dc_link *link,
}

LINK_INFO("link=%d, dc_sink_in=%p is now %s prev_sink=%p dpcd same=%d edid same=%d\n",
- link->link_index, sink,
- (sink_caps.signal == SIGNAL_TYPE_NONE ?
- "Disconnected":"Connected"), prev_sink,
- same_dpcd, same_edid);
+ link->link_index, sink,
+ (sink_caps.signal ==
+ SIGNAL_TYPE_NONE ? "Disconnected" : "Connected"),
+ prev_sink, same_dpcd, same_edid);

- if (prev_sink != NULL)
+ if (prev_sink)
dc_sink_release(prev_sink);

return true;
-
}

bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
--
2.25.1
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