mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-01 06:33:07 +00:00
Code Issues Releases Wiki Activity

drm/amd/display: Fix 128b132b link loss handling

Browse source 
[Why]
We don't check 128b132b-specific bits in LANE_ALIGN_STATUS_UPDATED DPCD
registers when parsing link loss status, which can cause us to miss a
link loss notification from some sinks.

[How]
Add a 128b132b-specific status bit check.

Cc: stable@vger.kernel.org # 6.3+
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Ilya Bakoulin <ilya.bakoulin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ilya Bakoulin 2023-06-07 16:49:45 -04:00 committed by Alex Deucher
parent effee878a8
commit ed83fe2abc
1 changed files with 9 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
View file

@ -82,8 +82,15 @@ bool dp_parse_link_loss_status(
}
/* Check interlane align.*/
if (sink_status_changed ||
!hpd_irq_dpcd_data->bytes.lane_status_updated.bits.INTERLANE_ALIGN_DONE) {
if (link_dp_get_encoding_format(&link->cur_link_settings) == DP_128b_132b_ENCODING &&
(!hpd_irq_dpcd_data->bytes.lane_status_updated.bits.EQ_INTERLANE_ALIGN_DONE_128b_132b ||
!hpd_irq_dpcd_data->bytes.lane_status_updated.bits.CDS_INTERLANE_ALIGN_DONE_128b_132b)) {
sink_status_changed = true;
} else if (!hpd_irq_dpcd_data->bytes.lane_status_updated.bits.INTERLANE_ALIGN_DONE) {
sink_status_changed = true;
}
if (sink_status_changed) {
DC_LOG_HW_HPD_IRQ("%s: Link Status changed.\n", __func__);