shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-06 02:50:49 +09:00
Code Issues Packages Projects Releases Wiki Activity

drm/bridge: analogix_dp: parse link-frequencies property of output endpoint

Browse Source 
Add capability to parse and retrieve max DP link supported rate from
link-frequencies property of output endpoint.

Change-Id: Ie3fbf7baa88503a04309ace6ecf004b23fb0bb78
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
This commit is contained in:
Wyon Bi
2023-04-11 00:46:08 +00:00
committed by Tao Huang
parent 23af0fccf5
commit c8bdf75ed6
1 changed files with 38 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
View File

@@ -1968,6 +1968,41 @@ static int analogix_dp_bridge_init(struct analogix_dp_device *dp)
return 0;
}
static u32 analogix_dp_parse_link_frequencies(struct analogix_dp_device *dp)
{
struct device_node *node = dp->dev->of_node;
struct device_node *endpoint;
u64 frequency = 0;
int cnt;
endpoint = of_graph_get_endpoint_by_regs(node, 1, 0);
if (!endpoint)
return 0;
cnt = of_property_count_u64_elems(endpoint, "link-frequencies");
if (cnt > 0)
of_property_read_u64_index(endpoint, "link-frequencies",
cnt - 1, &frequency);
of_node_put(endpoint);
if (!frequency)
return 0;
do_div(frequency, 10 * 1000); /* symbol rate kbytes */
switch (frequency) {
case 162000:
case 270000:
case 540000:
break;
default:
dev_err(dp->dev, "invalid link frequency value: %lld\n", frequency);
return 0;
}
return frequency;
}
static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp)
{
struct device_node *dp_node = dp->dev->of_node;
@@ -2003,24 +2038,9 @@ static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp)
break;
}
if (!of_property_read_u32(dp_node, "max-link-rate", &max_link_rate)) {
switch (max_link_rate) {
case 1620:
case 2700:
case 5400:
break;
default:
dev_err(dp->dev, "invalid max-link-rate value: %d\n",
max_link_rate);
return -EINVAL;
}
max_link_rate *= 100;
if (max_link_rate < drm_dp_bw_code_to_link_rate(video_info->max_link_rate))
video_info->max_link_rate =
drm_dp_link_rate_to_bw_code(max_link_rate);
}
max_link_rate = analogix_dp_parse_link_frequencies(dp);
if (max_link_rate && max_link_rate < drm_dp_bw_code_to_link_rate(video_info->max_link_rate))
video_info->max_link_rate = drm_dp_link_rate_to_bw_code(max_link_rate);
video_info->video_bist_enable =
of_property_read_bool(dp_node, "analogix,video-bist-enable");