[PATCH 08/19] drm/amd/display: Add option to defer works of hpd_rx_irq
Mikita Lipski
mikita.lipski at amd.com
Fri Aug 27 20:28:59 UTC 2021
From: Wayne Lin <Wayne.Lin at amd.com>
[Why & How]
Due to some code flow constraints, we need to defer dc_lock needed works
from dc_link_handle_hpd_rx_irq(). Thus, do following changes:
* Change allow_hpd_rx_irq() from static to public
* Change handle_automated_test() from static to public
* Extract link lost handling flow out from dc_link_handle_hpd_rx_irq()
and put those into a new function dc_link_dp_handle_link_loss()
* Add one option parameter to decide whether defer works within
dc_link_handle_hpd_rx_irq()
Reviewed-by: Mikita Lipski <mikita.lipski at amd.com>
Acked-by: Mikita Lipski <mikita.lipski at amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin at amd.com>
---
.../gpu/drm/amd/display/dc/core/dc_link_dp.c | 92 ++++++++++++-------
drivers/gpu/drm/amd/display/dc/dc_link.h | 3 +
2 files changed, 63 insertions(+), 32 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 44d7826e7654..f6589dc7a370 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -2746,7 +2746,7 @@ void decide_link_settings(struct dc_stream_state *stream,
}
/*************************Short Pulse IRQ***************************/
-static bool allow_hpd_rx_irq(const struct dc_link *link)
+bool dc_link_dp_allow_hpd_rx_irq(const struct dc_link *link)
{
/*
* Don't handle RX IRQ unless one of following is met:
@@ -3180,7 +3180,7 @@ static void dp_test_get_audio_test_data(struct dc_link *link, bool disable_video
}
}
-static void handle_automated_test(struct dc_link *link)
+void dc_link_dp_handle_automated_test(struct dc_link *link)
{
union test_request test_request;
union test_response test_response;
@@ -3229,17 +3229,50 @@ static void handle_automated_test(struct dc_link *link)
sizeof(test_response));
}
-bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd_irq_dpcd_data, bool *out_link_loss)
+void dc_link_dp_handle_link_loss(struct dc_link *link)
+{
+ int i;
+ struct pipe_ctx *pipe_ctx;
+
+ for (i = 0; i < MAX_PIPES; i++) {
+ pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
+ if (pipe_ctx && pipe_ctx->stream && pipe_ctx->stream->link == link)
+ break;
+ }
+
+ if (pipe_ctx == NULL || pipe_ctx->stream == NULL)
+ return;
+
+ for (i = 0; i < MAX_PIPES; i++) {
+ pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
+ if (pipe_ctx && pipe_ctx->stream && !pipe_ctx->stream->dpms_off &&
+ pipe_ctx->stream->link == link && !pipe_ctx->prev_odm_pipe) {
+ core_link_disable_stream(pipe_ctx);
+ }
+ }
+
+ for (i = 0; i < MAX_PIPES; i++) {
+ pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
+ if (pipe_ctx && pipe_ctx->stream && !pipe_ctx->stream->dpms_off &&
+ pipe_ctx->stream->link == link && !pipe_ctx->prev_odm_pipe) {
+ core_link_enable_stream(link->dc->current_state, pipe_ctx);
+ }
+ }
+}
+
+static bool handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd_irq_dpcd_data, bool *out_link_loss,
+ bool defer_handling, bool *has_left_work)
{
union hpd_irq_data hpd_irq_dpcd_data = { { { {0} } } };
union device_service_irq device_service_clear = { { 0 } };
enum dc_status result;
bool status = false;
- struct pipe_ctx *pipe_ctx;
- int i;
if (out_link_loss)
*out_link_loss = false;
+
+ if (has_left_work)
+ *has_left_work = false;
/* For use cases related to down stream connection status change,
* PSR and device auto test, refer to function handle_sst_hpd_irq
* in DAL2.1*/
@@ -3271,11 +3304,14 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
&device_service_clear.raw,
sizeof(device_service_clear.raw));
device_service_clear.raw = 0;
- handle_automated_test(link);
+ if (defer_handling && has_left_work)
+ *has_left_work = true;
+ else
+ dc_link_dp_handle_automated_test(link);
return false;
}
- if (!allow_hpd_rx_irq(link)) {
+ if (!dc_link_dp_allow_hpd_rx_irq(link)) {
DC_LOG_HW_HPD_IRQ("%s: skipping HPD handling on %d\n",
__func__, link->link_index);
return false;
@@ -3289,12 +3325,18 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
* so do not handle as a normal sink status change interrupt.
*/
- if (hpd_irq_dpcd_data.bytes.device_service_irq.bits.UP_REQ_MSG_RDY)
+ if (hpd_irq_dpcd_data.bytes.device_service_irq.bits.UP_REQ_MSG_RDY) {
+ if (defer_handling && has_left_work)
+ *has_left_work = true;
return true;
+ }
/* check if we have MST msg and return since we poll for it */
- if (hpd_irq_dpcd_data.bytes.device_service_irq.bits.DOWN_REP_MSG_RDY)
+ if (hpd_irq_dpcd_data.bytes.device_service_irq.bits.DOWN_REP_MSG_RDY) {
+ if (defer_handling && has_left_work)
+ *has_left_work = true;
return false;
+ }
/* For now we only handle 'Downstream port status' case.
* If we got sink count changed it means
@@ -3311,29 +3353,10 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
sizeof(hpd_irq_dpcd_data),
"Status: ");
- for (i = 0; i < MAX_PIPES; i++) {
- pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream && pipe_ctx->stream->link == link)
- break;
- }
-
- if (pipe_ctx == NULL || pipe_ctx->stream == NULL)
- return false;
-
-
- for (i = 0; i < MAX_PIPES; i++) {
- pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream && !pipe_ctx->stream->dpms_off &&
- pipe_ctx->stream->link == link && !pipe_ctx->prev_odm_pipe)
- core_link_disable_stream(pipe_ctx);
- }
-
- for (i = 0; i < MAX_PIPES; i++) {
- pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream && !pipe_ctx->stream->dpms_off &&
- pipe_ctx->stream->link == link && !pipe_ctx->prev_odm_pipe)
- core_link_enable_stream(link->dc->current_state, pipe_ctx);
- }
+ if (defer_handling && has_left_work)
+ *has_left_work = true;
+ else
+ dc_link_dp_handle_link_loss(link);
status = false;
if (out_link_loss)
@@ -3359,6 +3382,11 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
return status;
}
+bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd_irq_dpcd_data, bool *out_link_loss)
+{
+ return handle_hpd_rx_irq(link, out_hpd_irq_dpcd_data, out_link_loss, false, NULL);
+}
+
/*query dpcd for version and mst cap addresses*/
bool is_mst_supported(struct dc_link *link)
{
diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
index 83845d006c54..0efa2bc8639b 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -308,6 +308,9 @@ bool dc_link_wait_for_t12(struct dc_link *link);
enum dc_status read_hpd_rx_irq_data(
struct dc_link *link,
union hpd_irq_data *irq_data);
+void dc_link_dp_handle_automated_test(struct dc_link *link);
+void dc_link_dp_handle_link_loss(struct dc_link *link);
+bool dc_link_dp_allow_hpd_rx_irq(const struct dc_link *link);
struct dc_sink_init_data;
--
2.25.1
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