[PATCH AUTOSEL 6.10 02/34] drm/amd/display: Handle HPD_IRQ for internal link

Sasha Levin
2024-07-28T15:42:39Z

From: Sung-huai Wang <danny.wang@amd.com>

[ Upstream commit 239b31bd5c3fef3698440bf6436b2068c6bb08a3 ]

[Why]
TCON data is corrupted after electro static discharge test.
Once the TCON data get corrupted, they will get themselves
reset and send HPD_IRQ to source side.

[How]
Support HPD_IRQ for internal link, and restore the PSR/Replay setup.

Reviewed-by: Robin Chen <robin.chen@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Sung-huai Wang <danny.wang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../dc/link/protocols/link_dp_irq_handler.c | 25 ++++++++++++-------
1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
index 0fcf0b8530acf..659b8064d3618 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
@@ -373,6 +373,7 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
union device_service_irq device_service_clear = {0};
enum dc_status result;
bool status = false;
+ bool allow_active = false;

if (out_link_loss)
*out_link_loss = false;
@@ -427,12 +428,6 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
return false;
}

- if (handle_hpd_irq_psr_sink(link))
- /* PSR-related error was detected and handled */
- return true;
-
- handle_hpd_irq_replay_sink(link);
-
/* If PSR-related error handled, Main link may be off,
* so do not handle as a normal sink status change interrupt.
*/
@@ -454,9 +449,8 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
* If we got sink count changed it means
* Downstream port status changed,
* then DM should call DC to do the detection.
- * NOTE: Do not handle link loss on eDP since it is internal link*/
- if ((link->connector_signal != SIGNAL_TYPE_EDP) &&
- dp_parse_link_loss_status(
+ */
+ if (dp_parse_link_loss_status(
link,
&hpd_irq_dpcd_data)) {
/* Connectivity log: link loss */
@@ -465,6 +459,11 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
sizeof(hpd_irq_dpcd_data),
"Status: ");

+ if (link->psr_settings.psr_feature_enabled)
+ edp_set_psr_allow_active(link, &allow_active, true, false, NULL);
+ else if (link->replay_settings.replay_allow_active)
+ edp_set_replay_allow_active(link, &allow_active, true, false, NULL);
+
if (defer_handling && has_left_work)
*has_left_work = true;
else
@@ -477,6 +476,14 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
dp_trace_link_loss_increment(link);
}

+ if (*out_link_loss == false) {
+ if (handle_hpd_irq_psr_sink(link))
+ /* PSR-related error was detected and handled */
+ return true;
+
+ handle_hpd_irq_replay_sink(link);
+ }
+
if (link->type == dc_connection_sst_branch &&
hpd_irq_dpcd_data.bytes.sink_cnt.bits.SINK_COUNT
!= link->dpcd_sink_count)
--
2.43.0