drm/radeon/dp: add back special handling for NUTMEG
When I fixed the dp rate selection in:
092c96a8ab
drm/radeon: fix dp link rate selection (v2)
I accidently dropped the special handling for NUTMEG
DP bridge chips. They require a fixed link rate.
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Ken Wang <Qingqing.Wang@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Tested-by: Ken Moffat <zarniwhoop@ntlworld.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
parent
1e1490a385
commit
c8213a638f
|
@ -315,15 +315,27 @@ int radeon_dp_get_dp_link_config(struct drm_connector *connector,
|
|||
unsigned max_lane_num = drm_dp_max_lane_count(dpcd);
|
||||
unsigned lane_num, i, max_pix_clock;
|
||||
|
||||
for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
|
||||
for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
|
||||
max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
|
||||
if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
|
||||
ENCODER_OBJECT_ID_NUTMEG) {
|
||||
for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
|
||||
max_pix_clock = (lane_num * 270000 * 8) / bpp;
|
||||
if (max_pix_clock >= pix_clock) {
|
||||
*dp_lanes = lane_num;
|
||||
*dp_rate = link_rates[i];
|
||||
*dp_rate = 270000;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
|
||||
for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
|
||||
max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
|
||||
if (max_pix_clock >= pix_clock) {
|
||||
*dp_lanes = lane_num;
|
||||
*dp_rate = link_rates[i];
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
|
|
Loading…
Reference in a new issue