[PATCH 5.19 34/48] drm/amd/display: increase dcn315 pstate change latency

Greg Kroah-Hartman
2022-10-10T07:14:48Z

From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>

[ Upstream commit dcc2527df918edfe297c5074ccc1f05eae361ca6 ]

[Why & How]
Update after new measurment came in

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@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/clk_mgr/dcn315/dcn315_clk_mgr.c | 22 ++++++++++++-------
1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
index f4381725b210..c3d7712e9fd0 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
@@ -46,6 +46,9 @@
#define TO_CLK_MGR_DCN315(clk_mgr)\
container_of(clk_mgr, struct clk_mgr_dcn315, base)

+#define UNSUPPORTED_DCFCLK 10000000
+#define MIN_DPP_DISP_CLK 100000
+
static int dcn315_get_active_display_cnt_wa(
struct dc *dc,
struct dc_state *context)
@@ -146,6 +149,9 @@ static void dcn315_update_clocks(struct clk_mgr *clk_mgr_base,
}
}

+ /* Lock pstate by requesting unsupported dcfclk if change is unsupported */
+ if (!new_clocks->p_state_change_support)
+ new_clocks->dcfclk_khz = UNSUPPORTED_DCFCLK;
if (should_set_clock(safe_to_lower, new_clocks->dcfclk_khz, clk_mgr_base->clks.dcfclk_khz)) {
clk_mgr_base->clks.dcfclk_khz = new_clocks->dcfclk_khz;
dcn315_smu_set_hard_min_dcfclk(clk_mgr, clk_mgr_base->clks.dcfclk_khz);
@@ -159,10 +165,10 @@ static void dcn315_update_clocks(struct clk_mgr *clk_mgr_base,

// workaround: Limit dppclk to 100Mhz to avoid lower eDP panel switch to plus 4K monitor underflow.
if (!IS_DIAG_DC(dc->ctx->dce_environment)) {
- if (new_clocks->dppclk_khz < 100000)
- new_clocks->dppclk_khz = 100000;
- if (new_clocks->dispclk_khz < 100000)
- new_clocks->dispclk_khz = 100000;
+ if (new_clocks->dppclk_khz < MIN_DPP_DISP_CLK)
+ new_clocks->dppclk_khz = MIN_DPP_DISP_CLK;
+ if (new_clocks->dispclk_khz < MIN_DPP_DISP_CLK)
+ new_clocks->dispclk_khz = MIN_DPP_DISP_CLK;
}

if (should_set_clock(safe_to_lower, new_clocks->dppclk_khz, clk_mgr->base.clks.dppclk_khz)) {
@@ -272,7 +278,7 @@ static struct wm_table ddr5_wm_table = {
{
.wm_inst = WM_A,
.wm_type = WM_TYPE_PSTATE_CHG,
- .pstate_latency_us = 64.0,
+ .pstate_latency_us = 129.0,
.sr_exit_time_us = 11.5,
.sr_enter_plus_exit_time_us = 14.5,
.valid = true,
@@ -280,7 +286,7 @@ static struct wm_table ddr5_wm_table = {
{
.wm_inst = WM_B,
.wm_type = WM_TYPE_PSTATE_CHG,
- .pstate_latency_us = 64.0,
+ .pstate_latency_us = 129.0,
.sr_exit_time_us = 11.5,
.sr_enter_plus_exit_time_us = 14.5,
.valid = true,
@@ -288,7 +294,7 @@ static struct wm_table ddr5_wm_table = {
{
.wm_inst = WM_C,
.wm_type = WM_TYPE_PSTATE_CHG,
- .pstate_latency_us = 64.0,
+ .pstate_latency_us = 129.0,
.sr_exit_time_us = 11.5,
.sr_enter_plus_exit_time_us = 14.5,
.valid = true,
@@ -296,7 +302,7 @@ static struct wm_table ddr5_wm_table = {
{
.wm_inst = WM_D,
.wm_type = WM_TYPE_PSTATE_CHG,
- .pstate_latency_us = 64.0,
+ .pstate_latency_us = 129.0,
.sr_exit_time_us = 11.5,
.sr_enter_plus_exit_time_us = 14.5,
.valid = true,
--
2.35.1