From 024771f3fb75dc817e9429d5763f1a6eb84b6f21 Mon Sep 17 00:00:00 2001
From: Aric Cyr <Aric.Cyr@amd.com>
Date: Tue, 10 Dec 2024 18:38:15 -0500
Subject: [PATCH] drm/amd/display: Optimize cursor position updates
[why]
Updating the cursor enablement register can be a slow operation and accumulates
when high polling rate cursors cause frequent updates asynchronously to the
cursor position.
[how]
Since the cursor enable bit is cached there is no need to update the
enablement register if there is no change to it. This removes the
read-modify-write from the cursor position programming path in HUBP and
DPP, leaving only the register writes.
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Sung Lee <sung.lee@amd.com>
Signed-off-by: Aric Cyr <Aric.Cyr@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/dc/dpp/dcn10/dcn10_dpp.c | 7 ++++---
.../gpu/drm/amd/display/dc/dpp/dcn401/dcn401_dpp_cm.c | 6 ++++--
drivers/gpu/drm/amd/display/dc/hubp/dcn20/dcn20_hubp.c | 8 +++++---
.../gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c | 10 ++++++----
4 files changed, 19 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dpp/dcn10/dcn10_dpp.c b/drivers/gpu/drm/amd/display/dc/dpp/dcn10/dcn10_dpp.c
index 961d8936150ab..75fb77bca83ba 100644
--- a/drivers/gpu/drm/amd/display/dc/dpp/dcn10/dcn10_dpp.c
+++ b/drivers/gpu/drm/amd/display/dc/dpp/dcn10/dcn10_dpp.c
@@ -483,10 +483,11 @@ void dpp1_set_cursor_position(
if (src_y_offset + cursor_height <= 0)
cur_en = 0; /* not visible beyond top edge*/
- REG_UPDATE(CURSOR0_CONTROL,
- CUR0_ENABLE, cur_en);
+ if (dpp_base->pos.cur0_ctl.bits.cur0_enable != cur_en) {
+ REG_UPDATE(CURSOR0_CONTROL, CUR0_ENABLE, cur_en);
- dpp_base->pos.cur0_ctl.bits.cur0_enable = cur_en;
+ dpp_base->pos.cur0_ctl.bits.cur0_enable = cur_en;
+ }
}
void dpp1_cnv_set_optional_cursor_attributes(
diff --git a/drivers/gpu/drm/amd/display/dc/dpp/dcn401/dcn401_dpp_cm.c b/drivers/gpu/drm/amd/display/dc/dpp/dcn401/dcn401_dpp_cm.c
index 3b6ca7974e188..1236e0f9a2560 100644
--- a/drivers/gpu/drm/amd/display/dc/dpp/dcn401/dcn401_dpp_cm.c
+++ b/drivers/gpu/drm/amd/display/dc/dpp/dcn401/dcn401_dpp_cm.c
@@ -154,9 +154,11 @@ void dpp401_set_cursor_position(
struct dcn401_dpp *dpp = TO_DCN401_DPP(dpp_base);
uint32_t cur_en = pos->enable ? 1 : 0;
- REG_UPDATE(CURSOR0_CONTROL, CUR0_ENABLE, cur_en);
+ if (dpp_base->pos.cur0_ctl.bits.cur0_enable != cur_en) {
+ REG_UPDATE(CURSOR0_CONTROL, CUR0_ENABLE, cur_en);
- dpp_base->pos.cur0_ctl.bits.cur0_enable = cur_en;
+ dpp_base->pos.cur0_ctl.bits.cur0_enable = cur_en;
+ }
}
void dpp401_set_optional_cursor_attributes(
diff --git a/drivers/gpu/drm/amd/display/dc/hubp/dcn20/dcn20_hubp.c b/drivers/gpu/drm/amd/display/dc/hubp/dcn20/dcn20_hubp.c
index a748e6ab9c828..91259b896e032 100644
--- a/drivers/gpu/drm/amd/display/dc/hubp/dcn20/dcn20_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/hubp/dcn20/dcn20_hubp.c
@@ -1058,11 +1058,13 @@ void hubp2_cursor_set_position(
if (src_y_offset + cursor_height <= 0)
cur_en = 0; /* not visible beyond top edge*/
- if (cur_en && REG_READ(CURSOR_SURFACE_ADDRESS) == 0)
- hubp->funcs->set_cursor_attributes(hubp, &hubp->curs_attr);
+ if (hubp->pos.cur_ctl.bits.cur_enable != cur_en) {
+ if (cur_en && REG_READ(CURSOR_SURFACE_ADDRESS) == 0)
+ hubp->funcs->set_cursor_attributes(hubp, &hubp->curs_attr);
- REG_UPDATE(CURSOR_CONTROL,
+ REG_UPDATE(CURSOR_CONTROL,
CURSOR_ENABLE, cur_en);
+ }
REG_SET_2(CURSOR_POSITION, 0,
CURSOR_X_POSITION, pos->x,
diff --git a/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c b/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
index d8b81ad69e35a..5ed195377a6ce 100644
--- a/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
@@ -742,11 +742,13 @@ void hubp401_cursor_set_position(
dc_fixpt_from_int(dst_x_offset),
param->h_scale_ratio));
- if (cur_en && REG_READ(CURSOR_SURFACE_ADDRESS) == 0)
- hubp->funcs->set_cursor_attributes(hubp, &hubp->curs_attr);
+ if (hubp->pos.cur_ctl.bits.cur_enable != cur_en) {
+ if (cur_en && REG_READ(CURSOR_SURFACE_ADDRESS) == 0)
+ hubp->funcs->set_cursor_attributes(hubp, &hubp->curs_attr);
- REG_UPDATE(CURSOR_CONTROL,
- CURSOR_ENABLE, cur_en);
+ REG_UPDATE(CURSOR_CONTROL,
+ CURSOR_ENABLE, cur_en);
+ }
REG_SET_2(CURSOR_POSITION, 0,
CURSOR_X_POSITION, x_pos,
--
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