Re: [PATCH] drm/amd/display: Update DCN302 SR Exit Latency

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[AMD Official Use Only - Internal Distribution Only]


Hi Bindu,

The value is recommended by the hardware team. Since a non-recommended value was being used, that itself is the root cause. I will add this to commit message.

--

Thanks & Regards,
Aurabindo Pillai

From: R, Bindu <Bindu.R@xxxxxxx>
Sent: Thursday, April 8, 2021 11:55 AM
To: Pillai, Aurabindo <Aurabindo.Pillai@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: Aberback, Joshua <Joshua.Aberback@xxxxxxx>
Subject: Re: [PATCH] drm/amd/display: Update DCN302 SR Exit Latency
 

[AMD Official Use Only - Internal Distribution Only]


​Hi Jay,
   Could you please add few details on the root cause, in the [Why/How] section?

Thanks,
Bindu

From: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Sent: Thursday, April 8, 2021 11:48 AM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: Pillai, Aurabindo <Aurabindo.Pillai@xxxxxxx>; R, Bindu <Bindu.R@xxxxxxx>; Aberback, Joshua <Joshua.Aberback@xxxxxxx>
Subject: [PATCH] drm/amd/display: Update DCN302 SR Exit Latency
 
From: Joshua Aberback <joshua.aberback@xxxxxxx>

[Why]
Update SR Exit Latency to fix screen flickering caused due to OTG
underflow

Signed-off-by: Joshua Aberback <joshua.aberback@xxxxxxx>
Acked-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c b/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
index a928c1d9a557..fc2dea243d1b 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
@@ -164,7 +164,7 @@ struct _vcs_dpi_soc_bounding_box_st dcn3_02_soc = {
 
                 .min_dcfclk = 500.0, /* TODO: set this to actual min DCFCLK */
                 .num_states = 1,
-               .sr_exit_time_us = 12,
+               .sr_exit_time_us = 15.5,
                 .sr_enter_plus_exit_time_us = 20,
                 .urgent_latency_us = 4.0,
                 .urgent_latency_pixel_data_only_us = 4.0,
--
2.31.1

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